JDK 17 java.base.jmod - Base Module
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⏎ java/lang/module/ModuleDescriptor.java
/*
* Copyright (c) 2009, 2020, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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package java.lang.module;
import java.io.InputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.io.UncheckedIOException;
import java.nio.ByteBuffer;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static jdk.internal.module.Checks.*;
import static java.util.Objects.*;
import jdk.internal.module.Checks;
import jdk.internal.module.ModuleInfo;
/**
* A module descriptor.
*
* <p> A module descriptor describes a named module and defines methods to
* obtain each of its components. The module descriptor for a named module
* in the Java virtual machine is obtained by invoking the {@link
* java.lang.Module Module}'s {@link java.lang.Module#getDescriptor
* getDescriptor} method. Module descriptors can also be created using the
* {@link ModuleDescriptor.Builder} class or by reading the binary form of a
* module declaration ({@code module-info.class}) using the {@link
* #read(InputStream,Supplier) read} methods defined here. </p>
*
* <p> A module descriptor describes a <em>normal</em>, open, or automatic
* module. <em>Normal</em> modules and open modules describe their {@linkplain
* #requires() dependences}, {@link #exports() exported-packages}, the services
* that they {@linkplain #uses() use} or {@linkplain #provides() provide}, and other
* components. <em>Normal</em> modules may {@linkplain #opens() open} specific
* packages. The module descriptor for an open module does not declare any
* open packages (its {@code opens} method returns an empty set) but when
* instantiated in the Java virtual machine then it is treated as if all
* packages are open. The module descriptor for an automatic module does not
* declare any dependences (except for the mandatory dependency on {@code
* java.base}), and does not declare any exported or open packages. Automatic
* modules receive special treatment during resolution so that they read all
* other modules in the configuration. When an automatic module is instantiated
* in the Java virtual machine then it reads every unnamed module and is
* treated as if all packages are exported and open. </p>
*
* <p> {@code ModuleDescriptor} objects are immutable and safe for use by
* multiple concurrent threads.</p>
*
* @see java.lang.Module
* @since 9
*/
public class ModuleDescriptor
implements Comparable<ModuleDescriptor>
{
/**
* A modifier on a module.
*
* @see ModuleDescriptor#modifiers()
* @since 9
*/
public enum Modifier {
/**
* An open module. An open module does not declare any open packages
* but the resulting module is treated as if all packages are open.
*/
OPEN,
/**
* An automatic module. An automatic module is treated as if it exports
* and opens all packages.
*
* @apiNote This modifier does not correspond to a module flag in the
* binary form of a module declaration ({@code module-info.class}).
*/
AUTOMATIC,
/**
* The module was not explicitly or implicitly declared.
*/
SYNTHETIC,
/**
* The module was implicitly declared.
*/
MANDATED;
}
/**
* <p> A dependence upon a module. </p>
*
* @see ModuleDescriptor#requires()
* @since 9
*/
public static final class Requires
implements Comparable<Requires>
{
/**
* A modifier on a module dependence.
*
* @see Requires#modifiers()
* @since 9
*/
public enum Modifier {
/**
* The dependence causes any module which depends on the <i>current
* module</i> to have an implicitly declared dependence on the module
* named by the {@code Requires}.
*/
TRANSITIVE,
/**
* The dependence is mandatory in the static phase, during compilation,
* but is optional in the dynamic phase, during execution.
*/
STATIC,
/**
* The dependence was not explicitly or implicitly declared in the
* source of the module declaration.
*/
SYNTHETIC,
/**
* The dependence was implicitly declared in the source of the module
* declaration.
*/
MANDATED;
}
private final Set<Modifier> mods;
private final String name;
private final Version compiledVersion;
private final String rawCompiledVersion;
private Requires(Set<Modifier> ms, String mn, Version v, String vs) {
assert v == null || vs == null;
this.mods = Set.copyOf(ms);
this.name = mn;
this.compiledVersion = v;
this.rawCompiledVersion = vs;
}
private Requires(Set<Modifier> ms, String mn, Version v, boolean unused) {
this.mods = ms;
this.name = mn;
this.compiledVersion = v;
this.rawCompiledVersion = null;
}
/**
* Returns the set of modifiers.
*
* @return A possibly-empty unmodifiable set of modifiers
*/
public Set<Modifier> modifiers() {
return mods;
}
/**
* Return the module name.
*
* @return The module name
*/
public String name() {
return name;
}
/**
* Returns the version of the module if recorded at compile-time.
*
* @return The version of the module if recorded at compile-time,
* or an empty {@code Optional} if no version was recorded or
* the version string recorded is {@linkplain Version#parse(String)
* unparseable}
*/
public Optional<Version> compiledVersion() {
return Optional.ofNullable(compiledVersion);
}
/**
* Returns the string with the possibly-unparseable version of the module
* if recorded at compile-time.
*
* @return The string containing the version of the module if recorded
* at compile-time, or an empty {@code Optional} if no version
* was recorded
*
* @see #compiledVersion()
*/
public Optional<String> rawCompiledVersion() {
if (compiledVersion != null) {
return Optional.of(compiledVersion.toString());
} else {
return Optional.ofNullable(rawCompiledVersion);
}
}
/**
* Compares this module dependence to another.
*
* <p> Two {@code Requires} objects are compared by comparing their
* module names lexicographically. Where the module names are equal
* then the sets of modifiers are compared in the same way that
* module modifiers are compared (see {@link ModuleDescriptor#compareTo
* ModuleDescriptor.compareTo}). Where the module names are equal and
* the set of modifiers are equal then the version of the modules
* recorded at compile-time are compared. When comparing the versions
* recorded at compile-time then a dependence that has a recorded
* version is considered to succeed a dependence that does not have a
* recorded version. If both recorded versions are {@linkplain
* Version#parse(String) unparseable} then the {@linkplain
* #rawCompiledVersion() raw version strings} are compared
* lexicographically. </p>
*
* @param that
* The module dependence to compare
*
* @return A negative integer, zero, or a positive integer if this module
* dependence is less than, equal to, or greater than the given
* module dependence
*/
@Override
public int compareTo(Requires that) {
if (this == that) return 0;
int c = this.name().compareTo(that.name());
if (c != 0) return c;
// modifiers
long v1 = modsValue(this.modifiers());
long v2 = modsValue(that.modifiers());
c = Long.compare(v1, v2);
if (c != 0) return c;
// compiledVersion
c = compare(this.compiledVersion, that.compiledVersion);
if (c != 0) return c;
// rawCompiledVersion
c = compare(this.rawCompiledVersion, that.rawCompiledVersion);
if (c != 0) return c;
return 0;
}
/**
* Tests this module dependence for equality with the given object.
*
* <p> If the given object is not a {@code Requires} then this method
* returns {@code false}. Two module dependence objects are equal if
* the module names are equal, set of modifiers are equal, and the
* compiled version of both modules is equal or not recorded for
* both modules. </p>
*
* <p> This method satisfies the general contract of the {@link
* java.lang.Object#equals(Object) Object.equals} method. </p>
*
* @param ob
* the object to which this object is to be compared
*
* @return {@code true} if, and only if, the given object is a module
* dependence that is equal to this module dependence
*/
@Override
public boolean equals(Object ob) {
return (ob instanceof Requires that)
&& name.equals(that.name) && mods.equals(that.mods)
&& Objects.equals(compiledVersion, that.compiledVersion)
&& Objects.equals(rawCompiledVersion, that.rawCompiledVersion);
}
/**
* Computes a hash code for this module dependence.
*
* <p> The hash code is based upon the module name, modifiers, and the
* module version if recorded at compile time. It satisfies the general
* contract of the {@link Object#hashCode Object.hashCode} method. </p>
*
* @return The hash-code value for this module dependence
*/
@Override
public int hashCode() {
int hash = name.hashCode() * 43 + mods.hashCode();
if (compiledVersion != null)
hash = hash * 43 + compiledVersion.hashCode();
if (rawCompiledVersion != null)
hash = hash * 43 + rawCompiledVersion.hashCode();
return hash;
}
/**
* Returns a string describing this module dependence.
*
* @return A string describing this module dependence
*/
@Override
public String toString() {
String what;
if (compiledVersion != null) {
what = name() + " (@" + compiledVersion + ")";
} else {
what = name();
}
return ModuleDescriptor.toString(mods, what);
}
}
/**
* <p> A package exported by a module, may be qualified or unqualified. </p>
*
* @see ModuleDescriptor#exports()
* @since 9
*/
public static final class Exports
implements Comparable<Exports>
{
/**
* A modifier on an exported package.
*
* @see Exports#modifiers()
* @since 9
*/
public enum Modifier {
/**
* The export was not explicitly or implicitly declared in the
* source of the module declaration.
*/
SYNTHETIC,
/**
* The export was implicitly declared in the source of the module
* declaration.
*/
MANDATED;
}
private final Set<Modifier> mods;
private final String source;
private final Set<String> targets; // empty if unqualified export
/**
* Constructs an export
*/
private Exports(Set<Modifier> ms, String source, Set<String> targets) {
this.mods = Set.copyOf(ms);
this.source = source;
this.targets = Set.copyOf(targets);
}
private Exports(Set<Modifier> ms,
String source,
Set<String> targets,
boolean unused) {
this.mods = ms;
this.source = source;
this.targets = targets;
}
/**
* Returns the set of modifiers.
*
* @return A possibly-empty unmodifiable set of modifiers
*/
public Set<Modifier> modifiers() {
return mods;
}
/**
* Returns {@code true} if this is a qualified export.
*
* @return {@code true} if this is a qualified export
*/
public boolean isQualified() {
return !targets.isEmpty();
}
/**
* Returns the package name.
*
* @return The package name
*/
public String source() {
return source;
}
/**
* For a qualified export, returns the non-empty and immutable set
* of the module names to which the package is exported. For an
* unqualified export, returns an empty set.
*
* @return The set of target module names or for an unqualified
* export, an empty set
*/
public Set<String> targets() {
return targets;
}
/**
* Compares this module export to another.
*
* <p> Two {@code Exports} objects are compared by comparing the package
* names lexicographically. Where the packages names are equal then the
* sets of modifiers are compared in the same way that module modifiers
* are compared (see {@link ModuleDescriptor#compareTo
* ModuleDescriptor.compareTo}). Where the package names are equal and
* the set of modifiers are equal then the set of target modules are
* compared. This is done by sorting the names of the target modules
* in ascending order, and according to their natural ordering, and then
* comparing the corresponding elements lexicographically. Where the
* sets differ in size, and the larger set contains all elements of the
* smaller set, then the larger set is considered to succeed the smaller
* set. </p>
*
* @param that
* The module export to compare
*
* @return A negative integer, zero, or a positive integer if this module
* export is less than, equal to, or greater than the given
* export dependence
*/
@Override
public int compareTo(Exports that) {
if (this == that) return 0;
int c = source.compareTo(that.source);
if (c != 0)
return c;
// modifiers
long v1 = modsValue(this.modifiers());
long v2 = modsValue(that.modifiers());
c = Long.compare(v1, v2);
if (c != 0)
return c;
// targets
c = compare(targets, that.targets);
if (c != 0)
return c;
return 0;
}
/**
* Computes a hash code for this module export.
*
* <p> The hash code is based upon the modifiers, the package name,
* and for a qualified export, the set of modules names to which the
* package is exported. It satisfies the general contract of the
* {@link Object#hashCode Object.hashCode} method.
*
* @return The hash-code value for this module export
*/
@Override
public int hashCode() {
int hash = mods.hashCode();
hash = hash * 43 + source.hashCode();
return hash * 43 + targets.hashCode();
}
/**
* Tests this module export for equality with the given object.
*
* <p> If the given object is not an {@code Exports} then this method
* returns {@code false}. Two module exports objects are equal if their
* set of modifiers is equal, the package names are equal and the set
* of target module names is equal. </p>
*
* <p> This method satisfies the general contract of the {@link
* java.lang.Object#equals(Object) Object.equals} method. </p>
*
* @param ob
* the object to which this object is to be compared
*
* @return {@code true} if, and only if, the given object is a module
* dependence that is equal to this module dependence
*/
@Override
public boolean equals(Object ob) {
return (ob instanceof Exports other)
&& Objects.equals(this.mods, other.mods)
&& Objects.equals(this.source, other.source)
&& Objects.equals(this.targets, other.targets);
}
/**
* Returns a string describing the exported package.
*
* @return A string describing the exported package
*/
@Override
public String toString() {
String s = ModuleDescriptor.toString(mods, source);
if (targets.isEmpty())
return s;
else
return s + " to " + targets;
}
}
/**
* <p> A package opened by a module, may be qualified or unqualified. </p>
*
* <p> The <em>opens</em> directive in a module declaration declares a
* package to be open to allow all types in the package, and all their
* members, not just public types and their public members to be reflected
* on by APIs that support private access or a way to bypass or suppress
* default Java language access control checks. </p>
*
* @see ModuleDescriptor#opens()
* @since 9
*/
public static final class Opens
implements Comparable<Opens>
{
/**
* A modifier on an open package.
*
* @see Opens#modifiers()
* @since 9
*/
public enum Modifier {
/**
* The open package was not explicitly or implicitly declared in
* the source of the module declaration.
*/
SYNTHETIC,
/**
* The open package was implicitly declared in the source of the
* module declaration.
*/
MANDATED;
}
private final Set<Modifier> mods;
private final String source;
private final Set<String> targets; // empty if unqualified export
/**
* Constructs an {@code Opens}.
*/
private Opens(Set<Modifier> ms, String source, Set<String> targets) {
this.mods = Set.copyOf(ms);
this.source = source;
this.targets = Set.copyOf(targets);
}
private Opens(Set<Modifier> ms,
String source,
Set<String> targets,
boolean unused) {
this.mods = ms;
this.source = source;
this.targets = targets;
}
/**
* Returns the set of modifiers.
*
* @return A possibly-empty unmodifiable set of modifiers
*/
public Set<Modifier> modifiers() {
return mods;
}
/**
* Returns {@code true} if this is a qualified {@code Opens}.
*
* @return {@code true} if this is a qualified {@code Opens}
*/
public boolean isQualified() {
return !targets.isEmpty();
}
/**
* Returns the package name.
*
* @return The package name
*/
public String source() {
return source;
}
/**
* For a qualified {@code Opens}, returns the non-empty and immutable set
* of the module names to which the package is open. For an
* unqualified {@code Opens}, returns an empty set.
*
* @return The set of target module names or for an unqualified
* {@code Opens}, an empty set
*/
public Set<String> targets() {
return targets;
}
/**
* Compares this module {@code Opens} to another.
*
* <p> Two {@code Opens} objects are compared by comparing the package
* names lexicographically. Where the packages names are equal then the
* sets of modifiers are compared in the same way that module modifiers
* are compared (see {@link ModuleDescriptor#compareTo
* ModuleDescriptor.compareTo}). Where the package names are equal and
* the set of modifiers are equal then the set of target modules are
* compared. This is done by sorting the names of the target modules
* in ascending order, and according to their natural ordering, and then
* comparing the corresponding elements lexicographically. Where the
* sets differ in size, and the larger set contains all elements of the
* smaller set, then the larger set is considered to succeed the smaller
* set. </p>
*
* @param that
* The module {@code Opens} to compare
*
* @return A negative integer, zero, or a positive integer if this module
* {@code Opens} is less than, equal to, or greater than the given
* module {@code Opens}
*/
@Override
public int compareTo(Opens that) {
if (this == that) return 0;
int c = source.compareTo(that.source);
if (c != 0)
return c;
// modifiers
long v1 = modsValue(this.modifiers());
long v2 = modsValue(that.modifiers());
c = Long.compare(v1, v2);
if (c != 0)
return c;
// targets
c = compare(targets, that.targets);
if (c != 0)
return c;
return 0;
}
/**
* Computes a hash code for this module {@code Opens}.
*
* <p> The hash code is based upon the modifiers, the package name,
* and for a qualified {@code Opens}, the set of modules names to which the
* package is opened. It satisfies the general contract of the
* {@link Object#hashCode Object.hashCode} method.
*
* @return The hash-code value for this module {@code Opens}
*/
@Override
public int hashCode() {
int hash = mods.hashCode();
hash = hash * 43 + source.hashCode();
return hash * 43 + targets.hashCode();
}
/**
* Tests this module {@code Opens} for equality with the given object.
*
* <p> If the given object is not an {@code Opens} then this method
* returns {@code false}. Two {@code Opens} objects are equal if their
* set of modifiers is equal, the package names are equal and the set
* of target module names is equal. </p>
*
* <p> This method satisfies the general contract of the {@link
* java.lang.Object#equals(Object) Object.equals} method. </p>
*
* @param ob
* the object to which this object is to be compared
*
* @return {@code true} if, and only if, the given object is a module
* dependence that is equal to this module dependence
*/
@Override
public boolean equals(Object ob) {
return (ob instanceof Opens other)
&& Objects.equals(this.mods, other.mods)
&& Objects.equals(this.source, other.source)
&& Objects.equals(this.targets, other.targets);
}
/**
* Returns a string describing the open package.
*
* @return A string describing the open package
*/
@Override
public String toString() {
String s = ModuleDescriptor.toString(mods, source);
if (targets.isEmpty())
return s;
else
return s + " to " + targets;
}
}
/**
* <p> A service that a module provides one or more implementations of. </p>
*
* @see ModuleDescriptor#provides()
* @since 9
*/
public static final class Provides
implements Comparable<Provides>
{
private final String service;
private final List<String> providers;
private Provides(String service, List<String> providers) {
this.service = service;
this.providers = List.copyOf(providers);
}
private Provides(String service, List<String> providers, boolean unused) {
this.service = service;
this.providers = providers;
}
/**
* Returns the fully qualified class name of the service type.
*
* @return The fully qualified class name of the service type
*/
public String service() { return service; }
/**
* Returns the list of the fully qualified class names of the providers
* or provider factories.
*
* @return A non-empty and unmodifiable list of the fully qualified class
* names of the providers or provider factories
*/
public List<String> providers() { return providers; }
/**
* Compares this {@code Provides} to another.
*
* <p> Two {@code Provides} objects are compared by comparing the fully
* qualified class name of the service type lexicographically. Where the
* class names are equal then the list of the provider class names are
* compared by comparing the corresponding elements of both lists
* lexicographically and in sequence. Where the lists differ in size,
* {@code N} is the size of the shorter list, and the first {@code N}
* corresponding elements are equal, then the longer list is considered
* to succeed the shorter list. </p>
*
* @param that
* The {@code Provides} to compare
*
* @return A negative integer, zero, or a positive integer if this
* {@code Provides} is less than, equal to, or greater than
* the given {@code Provides}
*/
public int compareTo(Provides that) {
if (this == that) return 0;
int c = service.compareTo(that.service);
if (c != 0) return c;
// compare provider class names in sequence
int size1 = this.providers.size();
int size2 = that.providers.size();
for (int index=0; index<Math.min(size1, size2); index++) {
String e1 = this.providers.get(index);
String e2 = that.providers.get(index);
c = e1.compareTo(e2);
if (c != 0) return c;
}
if (size1 == size2) {
return 0;
} else {
return (size1 > size2) ? 1 : -1;
}
}
/**
* Computes a hash code for this {@code Provides}.
*
* <p> The hash code is based upon the service type and the set of
* providers. It satisfies the general contract of the {@link
* Object#hashCode Object.hashCode} method. </p>
*
* @return The hash-code value for this module provides
*/
@Override
public int hashCode() {
return service.hashCode() * 43 + providers.hashCode();
}
/**
* Tests this {@code Provides} for equality with the given object.
*
* <p> If the given object is not a {@code Provides} then this method
* returns {@code false}. Two {@code Provides} objects are equal if the
* service type is equal and the list of providers is equal. </p>
*
* <p> This method satisfies the general contract of the {@link
* java.lang.Object#equals(Object) Object.equals} method. </p>
*
* @param ob
* the object to which this object is to be compared
*
* @return {@code true} if, and only if, the given object is a
* {@code Provides} that is equal to this {@code Provides}
*/
@Override
public boolean equals(Object ob) {
return (ob instanceof Provides other)
&& Objects.equals(this.service, other.service)
&& Objects.equals(this.providers, other.providers);
}
/**
* Returns a string describing this {@code Provides}.
*
* @return A string describing this {@code Provides}
*/
@Override
public String toString() {
return service + " with " + providers;
}
}
/**
* A module's version string.
*
* <p> A version string has three components: The version number itself, an
* optional pre-release version, and an optional build version. Each
* component is a sequence of tokens; each token is either a non-negative
* integer or a string. Tokens are separated by the punctuation characters
* {@code '.'}, {@code '-'}, or {@code '+'}, or by transitions from a
* sequence of digits to a sequence of characters that are neither digits
* nor punctuation characters, or vice versa.
*
* <ul>
*
* <li> The <i>version number</i> is a sequence of tokens separated by
* {@code '.'} characters, terminated by the first {@code '-'} or {@code
* '+'} character. </li>
*
* <li> The <i>pre-release version</i> is a sequence of tokens separated
* by {@code '.'} or {@code '-'} characters, terminated by the first
* {@code '+'} character. </li>
*
* <li> The <i>build version</i> is a sequence of tokens separated by
* {@code '.'}, {@code '-'}, or {@code '+'} characters.
*
* </ul>
*
* <p> When comparing two version strings, the elements of their
* corresponding components are compared in pointwise fashion. If one
* component is longer than the other, but otherwise equal to it, then the
* first component is considered the greater of the two; otherwise, if two
* corresponding elements are integers then they are compared as such;
* otherwise, at least one of the elements is a string, so the other is
* converted into a string if it is an integer and the two are compared
* lexicographically. Trailing integer elements with the value zero are
* ignored.
*
* <p> Given two version strings, if their version numbers differ then the
* result of comparing them is the result of comparing their version
* numbers; otherwise, if one of them has a pre-release version but the
* other does not then the first is considered to precede the second,
* otherwise the result of comparing them is the result of comparing their
* pre-release versions; otherwise, the result of comparing them is the
* result of comparing their build versions.
*
* @see ModuleDescriptor#version()
* @since 9
*/
public static final class Version
implements Comparable<Version>
{
private final String version;
// If Java had disjunctive types then we'd write List<Integer|String> here
//
private final List<Object> sequence;
private final List<Object> pre;
private final List<Object> build;
// Take a numeric token starting at position i
// Append it to the given list
// Return the index of the first character not taken
// Requires: s.charAt(i) is (decimal) numeric
//
private static int takeNumber(String s, int i, List<Object> acc) {
char c = s.charAt(i);
int d = (c - '0');
int n = s.length();
while (++i < n) {
c = s.charAt(i);
if (c >= '0' && c <= '9') {
d = d * 10 + (c - '0');
continue;
}
break;
}
acc.add(d);
return i;
}
// Take a string token starting at position i
// Append it to the given list
// Return the index of the first character not taken
// Requires: s.charAt(i) is not '.'
//
private static int takeString(String s, int i, List<Object> acc) {
int b = i;
int n = s.length();
while (++i < n) {
char c = s.charAt(i);
if (c != '.' && c != '-' && c != '+' && !(c >= '0' && c <= '9'))
continue;
break;
}
acc.add(s.substring(b, i));
return i;
}
// Syntax: tok+ ( '-' tok+)? ( '+' tok+)?
// First token string is sequence, second is pre, third is build
// Tokens are separated by '.' or '-', or by changes between alpha & numeric
// Numeric tokens are compared as decimal integers
// Non-numeric tokens are compared lexicographically
// A version with a non-empty pre is less than a version with same seq but no pre
// Tokens in build may contain '-' and '+'
//
private Version(String v) {
if (v == null)
throw new IllegalArgumentException("Null version string");
int n = v.length();
if (n == 0)
throw new IllegalArgumentException("Empty version string");
int i = 0;
char c = v.charAt(i);
if (!(c >= '0' && c <= '9'))
throw new IllegalArgumentException(v
+ ": Version string does not start"
+ " with a number");
List<Object> sequence = new ArrayList<>(4);
List<Object> pre = new ArrayList<>(2);
List<Object> build = new ArrayList<>(2);
i = takeNumber(v, i, sequence);
while (i < n) {
c = v.charAt(i);
if (c == '.') {
i++;
continue;
}
if (c == '-' || c == '+') {
i++;
break;
}
if (c >= '0' && c <= '9')
i = takeNumber(v, i, sequence);
else
i = takeString(v, i, sequence);
}
if (c == '-' && i >= n)
throw new IllegalArgumentException(v + ": Empty pre-release");
while (i < n) {
c = v.charAt(i);
if (c >= '0' && c <= '9')
i = takeNumber(v, i, pre);
else
i = takeString(v, i, pre);
if (i >= n)
break;
c = v.charAt(i);
if (c == '.' || c == '-') {
i++;
continue;
}
if (c == '+') {
i++;
break;
}
}
if (c == '+' && i >= n)
throw new IllegalArgumentException(v + ": Empty pre-release");
while (i < n) {
c = v.charAt(i);
if (c >= '0' && c <= '9')
i = takeNumber(v, i, build);
else
i = takeString(v, i, build);
if (i >= n)
break;
c = v.charAt(i);
if (c == '.' || c == '-' || c == '+') {
i++;
continue;
}
}
this.version = v;
this.sequence = sequence;
this.pre = pre;
this.build = build;
}
/**
* Parses the given string as a version string.
*
* @param v
* The string to parse
*
* @return The resulting {@code Version}
*
* @throws IllegalArgumentException
* If {@code v} is {@code null}, an empty string, or cannot be
* parsed as a version string
*/
public static Version parse(String v) {
return new Version(v);
}
@SuppressWarnings("unchecked")
private int cmp(Object o1, Object o2) {
return ((Comparable)o1).compareTo(o2);
}
private int compareTokens(List<Object> ts1, List<Object> ts2) {
int n = Math.min(ts1.size(), ts2.size());
for (int i = 0; i < n; i++) {
Object o1 = ts1.get(i);
Object o2 = ts2.get(i);
if ((o1 instanceof Integer && o2 instanceof Integer)
|| (o1 instanceof String && o2 instanceof String))
{
int c = cmp(o1, o2);
if (c == 0)
continue;
return c;
}
// Types differ, so convert number to string form
int c = o1.toString().compareTo(o2.toString());
if (c == 0)
continue;
return c;
}
List<Object> rest = ts1.size() > ts2.size() ? ts1 : ts2;
int e = rest.size();
for (int i = n; i < e; i++) {
Object o = rest.get(i);
if (o instanceof Integer && ((Integer)o) == 0)
continue;
return ts1.size() - ts2.size();
}
return 0;
}
/**
* Compares this module version to another module version. Module
* versions are compared as described in the class description.
*
* @param that
* The module version to compare
*
* @return A negative integer, zero, or a positive integer as this
* module version is less than, equal to, or greater than the
* given module version
*/
@Override
public int compareTo(Version that) {
int c = compareTokens(this.sequence, that.sequence);
if (c != 0) return c;
if (this.pre.isEmpty()) {
if (!that.pre.isEmpty()) return +1;
} else {
if (that.pre.isEmpty()) return -1;
}
c = compareTokens(this.pre, that.pre);
if (c != 0) return c;
return compareTokens(this.build, that.build);
}
/**
* Tests this module version for equality with the given object.
*
* <p> If the given object is not a {@code Version} then this method
* returns {@code false}. Two module version are equal if their
* corresponding components are equal. </p>
*
* <p> This method satisfies the general contract of the {@link
* java.lang.Object#equals(Object) Object.equals} method. </p>
*
* @param ob
* the object to which this object is to be compared
*
* @return {@code true} if, and only if, the given object is a module
* reference that is equal to this module reference
*/
@Override
public boolean equals(Object ob) {
if (!(ob instanceof Version))
return false;
return compareTo((Version)ob) == 0;
}
/**
* Computes a hash code for this module version.
*
* <p> The hash code is based upon the components of the version and
* satisfies the general contract of the {@link Object#hashCode
* Object.hashCode} method. </p>
*
* @return The hash-code value for this module version
*/
@Override
public int hashCode() {
return version.hashCode();
}
/**
* Returns the string from which this version was parsed.
*
* @return The string from which this version was parsed.
*/
@Override
public String toString() {
return version;
}
}
private final String name;
private final Version version;
private final String rawVersionString;
private final Set<Modifier> modifiers;
private final boolean open; // true if modifiers contains OPEN
private final boolean automatic; // true if modifiers contains AUTOMATIC
private final Set<Requires> requires;
private final Set<Exports> exports;
private final Set<Opens> opens;
private final Set<String> uses;
private final Set<Provides> provides;
private final Set<String> packages;
private final String mainClass;
private ModuleDescriptor(String name,
Version version,
String rawVersionString,
Set<Modifier> modifiers,
Set<Requires> requires,
Set<Exports> exports,
Set<Opens> opens,
Set<String> uses,
Set<Provides> provides,
Set<String> packages,
String mainClass)
{
assert version == null || rawVersionString == null;
this.name = name;
this.version = version;
this.rawVersionString = rawVersionString;
this.modifiers = Set.copyOf(modifiers);
this.open = modifiers.contains(Modifier.OPEN);
this.automatic = modifiers.contains(Modifier.AUTOMATIC);
assert (requires.stream().map(Requires::name).distinct().count()
== requires.size());
this.requires = Set.copyOf(requires);
this.exports = Set.copyOf(exports);
this.opens = Set.copyOf(opens);
this.uses = Set.copyOf(uses);
this.provides = Set.copyOf(provides);
this.packages = Set.copyOf(packages);
this.mainClass = mainClass;
}
/**
* Creates a module descriptor from its components.
* The arguments are pre-validated and sets are unmodifiable sets.
*/
ModuleDescriptor(String name,
Version version,
Set<Modifier> modifiers,
Set<Requires> requires,
Set<Exports> exports,
Set<Opens> opens,
Set<String> uses,
Set<Provides> provides,
Set<String> packages,
String mainClass,
int hashCode,
boolean unused) {
this.name = name;
this.version = version;
this.rawVersionString = null;
this.modifiers = modifiers;
this.open = modifiers.contains(Modifier.OPEN);
this.automatic = modifiers.contains(Modifier.AUTOMATIC);
this.requires = requires;
this.exports = exports;
this.opens = opens;
this.uses = uses;
this.provides = provides;
this.packages = packages;
this.mainClass = mainClass;
this.hash = hashCode;
}
/**
* <p> Returns the module name. </p>
*
* @return The module name
*/
public String name() {
return name;
}
/**
* <p> Returns the set of module modifiers. </p>
*
* @return A possibly-empty unmodifiable set of modifiers
*/
public Set<Modifier> modifiers() {
return modifiers;
}
/**
* <p> Returns {@code true} if this is an open module. </p>
*
* <p> This method is equivalent to testing if the set of {@link #modifiers()
* modifiers} contains the {@link Modifier#OPEN OPEN} modifier. </p>
*
* @return {@code true} if this is an open module
*/
public boolean isOpen() {
return open;
}
/**
* <p> Returns {@code true} if this is an automatic module. </p>
*
* <p> This method is equivalent to testing if the set of {@link #modifiers()
* modifiers} contains the {@link Modifier#AUTOMATIC AUTOMATIC} modifier. </p>
*
* @return {@code true} if this is an automatic module
*/
public boolean isAutomatic() {
return automatic;
}
/**
* <p> Returns the set of {@code Requires} objects representing the module
* dependences. </p>
*
* <p> The set includes a dependency on "{@code java.base}" when this
* module is not named "{@code java.base}". If this module is an automatic
* module then it does not have a dependency on any module other than
* "{@code java.base}". </p>
*
* @return A possibly-empty unmodifiable set of {@link Requires} objects
*/
public Set<Requires> requires() {
return requires;
}
/**
* <p> Returns the set of {@code Exports} objects representing the exported
* packages. </p>
*
* <p> If this module is an automatic module then the set of exports
* is empty. </p>
*
* @return A possibly-empty unmodifiable set of exported packages
*/
public Set<Exports> exports() {
return exports;
}
/**
* <p> Returns the set of {@code Opens} objects representing the open
* packages. </p>
*
* <p> If this module is an open module or an automatic module then the
* set of open packages is empty. </p>
*
* @return A possibly-empty unmodifiable set of open packages
*/
public Set<Opens> opens() {
return opens;
}
/**
* <p> Returns the set of service dependences. </p>
*
* <p> If this module is an automatic module then the set of service
* dependences is empty. </p>
*
* @return A possibly-empty unmodifiable set of the fully qualified class
* names of the service types used
*/
public Set<String> uses() {
return uses;
}
/**
* <p> Returns the set of {@code Provides} objects representing the
* services that the module provides. </p>
*
* @return The possibly-empty unmodifiable set of the services that this
* module provides
*/
public Set<Provides> provides() {
return provides;
}
/**
* <p> Returns the module version. </p>
*
* @return This module's version, or an empty {@code Optional} if the
* module does not have a version or the version is
* {@linkplain Version#parse(String) unparseable}
*/
public Optional<Version> version() {
return Optional.ofNullable(version);
}
/**
* <p> Returns the string with the possibly-unparseable version of the
* module. </p>
*
* @return The string containing the version of the module or an empty
* {@code Optional} if the module does not have a version
*
* @see #version()
*/
public Optional<String> rawVersion() {
if (version != null) {
return Optional.of(version.toString());
} else {
return Optional.ofNullable(rawVersionString);
}
}
/**
* <p> Returns a string containing the module name and, if present, its
* version. </p>
*
* @return A string containing the module name and, if present, its
* version
*/
public String toNameAndVersion() {
if (version != null) {
return name() + "@" + version;
} else {
return name();
}
}
/**
* <p> Returns the module main class. </p>
*
* @return The fully qualified class name of the module's main class
*/
public Optional<String> mainClass() {
return Optional.ofNullable(mainClass);
}
/**
* Returns the set of packages in the module.
*
* <p> The set of packages includes all exported and open packages, as well
* as the packages of any service providers, and the package for the main
* class. </p>
*
* @return A possibly-empty unmodifiable set of the packages in the module
*/
public Set<String> packages() {
return packages;
}
/**
* A builder for building {@link ModuleDescriptor} objects.
*
* <p> {@code ModuleDescriptor} defines the {@link #newModule newModule},
* {@link #newOpenModule newOpenModule}, and {@link #newAutomaticModule
* newAutomaticModule} methods to create builders for building
* <em>normal</em>, open, and automatic modules. </p>
*
* <p> The set of packages in the module are accumulated by the {@code
* Builder} as the {@link ModuleDescriptor.Builder#exports(String) exports},
* {@link ModuleDescriptor.Builder#opens(String) opens},
* {@link ModuleDescriptor.Builder#packages(Set) packages},
* {@link ModuleDescriptor.Builder#provides(String,List) provides}, and
* {@link ModuleDescriptor.Builder#mainClass(String) mainClass} methods are
* invoked. </p>
*
* <p> The module names, package names, and class names that are parameters
* specified to the builder methods are the module names, package names,
* and qualified names of classes (in named packages) as defined in the
* <cite>The Java Language Specification</cite>. </p>
*
* <p> Example usage: </p>
* <pre>{@code ModuleDescriptor descriptor = ModuleDescriptor.newModule("stats.core")
* .requires("java.base")
* .exports("org.acme.stats.core.clustering")
* .exports("org.acme.stats.core.regression")
* .packages(Set.of("org.acme.stats.core.internal"))
* .build();
* }</pre>
*
* @apiNote A {@code Builder} checks the components and invariants as
* components are added to the builder. The rationale for this is to detect
* errors as early as possible and not defer all validation to the
* {@link #build build} method.
*
* @since 9
*/
public static final class Builder {
final String name;
final boolean strict;
final Set<Modifier> modifiers;
final boolean open;
final boolean automatic;
final Set<String> packages = new HashSet<>();
final Map<String, Requires> requires = new HashMap<>();
final Map<String, Exports> exports = new HashMap<>();
final Map<String, Opens> opens = new HashMap<>();
final Set<String> uses = new HashSet<>();
final Map<String, Provides> provides = new HashMap<>();
Version version;
String rawVersionString;
String mainClass;
/**
* Initializes a new builder with the given module name.
*
* If {@code strict} is {@code true} then module, package, and class
* names are checked to ensure they are legal names. In addition, the
* {@link #build buid} method will add "{@code requires java.base}" if
* the dependency is not declared.
*/
Builder(String name, boolean strict, Set<Modifier> modifiers) {
this.name = (strict) ? requireModuleName(name) : name;
this.strict = strict;
this.modifiers = modifiers;
this.open = modifiers.contains(Modifier.OPEN);
this.automatic = modifiers.contains(Modifier.AUTOMATIC);
assert !open || !automatic;
}
/**
* Returns a snapshot of the packages in the module.
*/
/* package */ Set<String> packages() {
return Collections.unmodifiableSet(packages);
}
/**
* Adds a dependence on a module.
*
* @param req
* The dependence
*
* @return This builder
*
* @throws IllegalArgumentException
* If the dependence is on the module that this builder was
* initialized to build
* @throws IllegalStateException
* If the dependence on the module has already been declared
* or this builder is for an automatic module
*/
public Builder requires(Requires req) {
if (automatic)
throw new IllegalStateException("Automatic modules cannot declare"
+ " dependences");
String mn = req.name();
if (name.equals(mn))
throw new IllegalArgumentException("Dependence on self");
if (requires.containsKey(mn))
throw new IllegalStateException("Dependence upon " + mn
+ " already declared");
requires.put(mn, req);
return this;
}
/**
* Adds a dependence on a module with the given (and possibly empty)
* set of modifiers. The dependence includes the version of the
* module that was recorded at compile-time.
*
* @param ms
* The set of modifiers
* @param mn
* The module name
* @param compiledVersion
* The version of the module recorded at compile-time
*
* @return This builder
*
* @throws IllegalArgumentException
* If the module name is {@code null}, is not a legal module
* name, or is equal to the module name that this builder
* was initialized to build
* @throws IllegalStateException
* If the dependence on the module has already been declared
* or this builder is for an automatic module
*/
public Builder requires(Set<Requires.Modifier> ms,
String mn,
Version compiledVersion) {
Objects.requireNonNull(compiledVersion);
if (strict)
mn = requireModuleName(mn);
return requires(new Requires(ms, mn, compiledVersion, null));
}
/* package */Builder requires(Set<Requires.Modifier> ms,
String mn,
String rawCompiledVersion) {
Requires r;
try {
Version v = Version.parse(rawCompiledVersion);
r = new Requires(ms, mn, v, null);
} catch (IllegalArgumentException e) {
if (strict) throw e;
r = new Requires(ms, mn, null, rawCompiledVersion);
}
return requires(r);
}
/**
* Adds a dependence on a module with the given (and possibly empty)
* set of modifiers.
*
* @param ms
* The set of modifiers
* @param mn
* The module name
*
* @return This builder
*
* @throws IllegalArgumentException
* If the module name is {@code null}, is not a legal module
* name, or is equal to the module name that this builder
* was initialized to build
* @throws IllegalStateException
* If the dependence on the module has already been declared
* or this builder is for an automatic module
*/
public Builder requires(Set<Requires.Modifier> ms, String mn) {
if (strict)
mn = requireModuleName(mn);
return requires(new Requires(ms, mn, null, null));
}
/**
* Adds a dependence on a module with an empty set of modifiers.
*
* @param mn
* The module name
*
* @return This builder
*
* @throws IllegalArgumentException
* If the module name is {@code null}, is not a legal module
* name, or is equal to the module name that this builder
* was initialized to build
* @throws IllegalStateException
* If the dependence on the module has already been declared
* or this builder is for an automatic module
*/
public Builder requires(String mn) {
return requires(EnumSet.noneOf(Requires.Modifier.class), mn);
}
/**
* Adds an exported package.
*
* @param e
* The export
*
* @return This builder
*
* @throws IllegalStateException
* If the {@link Exports#source() package} is already declared as
* exported or this builder is for an automatic module
*/
public Builder exports(Exports e) {
if (automatic) {
throw new IllegalStateException("Automatic modules cannot declare"
+ " exported packages");
}
String source = e.source();
if (exports.containsKey(source)) {
throw new IllegalStateException("Exported package " + source
+ " already declared");
}
exports.put(source, e);
packages.add(source);
return this;
}
/**
* Adds an exported package with the given (and possibly empty) set of
* modifiers. The package is exported to a set of target modules.
*
* @param ms
* The set of modifiers
* @param pn
* The package name
* @param targets
* The set of target modules names
*
* @return This builder
*
* @throws IllegalArgumentException
* If the package name is {@code null} or is not a legal
* package name, the set of target modules is empty, or the set
* of target modules contains a name that is not a legal module
* name
* @throws IllegalStateException
* If the package is already declared as exported
* or this builder is for an automatic module
*/
public Builder exports(Set<Exports.Modifier> ms,
String pn,
Set<String> targets)
{
targets = new HashSet<>(targets);
if (targets.isEmpty())
throw new IllegalArgumentException("Empty target set");
if (strict) {
requirePackageName(pn);
targets.forEach(Checks::requireModuleName);
}
Exports e = new Exports(ms, pn, targets);
return exports(e);
}
/**
* Adds an exported package with the given (and possibly empty) set of
* modifiers. The package is exported to all modules.
*
* @param ms
* The set of modifiers
* @param pn
* The package name
*
* @return This builder
*
* @throws IllegalArgumentException
* If the package name is {@code null} or is not a legal
* package name
* @throws IllegalStateException
* If the package is already declared as exported
* or this builder is for an automatic module
*/
public Builder exports(Set<Exports.Modifier> ms, String pn) {
if (strict) {
requirePackageName(pn);
}
Exports e = new Exports(ms, pn, Set.of());
return exports(e);
}
/**
* Adds an exported package. The package is exported to a set of target
* modules.
*
* @param pn
* The package name
* @param targets
* The set of target modules names
*
* @return This builder
*
* @throws IllegalArgumentException
* If the package name is {@code null} or is not a legal
* package name, the set of target modules is empty, or the set
* of target modules contains a name that is not a legal module
* name
* @throws IllegalStateException
* If the package is already declared as exported
* or this builder is for an automatic module
*/
public Builder exports(String pn, Set<String> targets) {
return exports(Set.of(), pn, targets);
}
/**
* Adds an exported package. The package is exported to all modules.
*
* @param pn
* The package name
*
* @return This builder
*
* @throws IllegalArgumentException
* If the package name is {@code null} or is not a legal
* package name
* @throws IllegalStateException
* If the package is already declared as exported
* or this builder is for an automatic module
*/
public Builder exports(String pn) {
return exports(Set.of(), pn);
}
/**
* Adds an open package.
*
* @param obj
* The {@code Opens} object
*
* @return This builder
*
* @throws IllegalStateException
* If the package is already declared as open, or this is a
* builder for an open module or automatic module
*/
public Builder opens(Opens obj) {
if (open || automatic) {
throw new IllegalStateException("Open or automatic modules cannot"
+ " declare open packages");
}
String source = obj.source();
if (opens.containsKey(source)) {
throw new IllegalStateException("Open package " + source
+ " already declared");
}
opens.put(source, obj);
packages.add(source);
return this;
}
/**
* Adds an open package with the given (and possibly empty) set of
* modifiers. The package is open to a set of target modules.
*
* @param ms
* The set of modifiers
* @param pn
* The package name
* @param targets
* The set of target modules names
*
* @return This builder
*
* @throws IllegalArgumentException
* If the package name is {@code null} or is not a legal
* package name, the set of target modules is empty, or the set
* of target modules contains a name that is not a legal module
* name
* @throws IllegalStateException
* If the package is already declared as open, or this is a
* builder for an open module or automatic module
*/
public Builder opens(Set<Opens.Modifier> ms,
String pn,
Set<String> targets)
{
targets = new HashSet<>(targets);
if (targets.isEmpty())
throw new IllegalArgumentException("Empty target set");
if (strict) {
requirePackageName(pn);
targets.forEach(Checks::requireModuleName);
}
Opens opens = new Opens(ms, pn, targets);
return opens(opens);
}
/**
* Adds an open package with the given (and possibly empty) set of
* modifiers. The package is open to all modules.
*
* @param ms
* The set of modifiers
* @param pn
* The package name
*
* @return This builder
*
* @throws IllegalArgumentException
* If the package name is {@code null} or is not a legal
* package name
* @throws IllegalStateException
* If the package is already declared as open, or this is a
* builder for an open module or automatic module
*/
public Builder opens(Set<Opens.Modifier> ms, String pn) {
if (strict) {
requirePackageName(pn);
}
Opens e = new Opens(ms, pn, Set.of());
return opens(e);
}
/**
* Adds an open package. The package is open to a set of target modules.
*
* @param pn
* The package name
* @param targets
* The set of target modules names
*
* @return This builder
*
* @throws IllegalArgumentException
* If the package name is {@code null} or is not a legal
* package name, the set of target modules is empty, or the set
* of target modules contains a name that is not a legal module
* name
* @throws IllegalStateException
* If the package is already declared as open, or this is a
* builder for an open module or automatic module
*/
public Builder opens(String pn, Set<String> targets) {
return opens(Set.of(), pn, targets);
}
/**
* Adds an open package. The package is open to all modules.
*
* @param pn
* The package name
*
* @return This builder
*
* @throws IllegalArgumentException
* If the package name is {@code null} or is not a legal
* package name
* @throws IllegalStateException
* If the package is already declared as open, or this is a
* builder for an open module or automatic module
*/
public Builder opens(String pn) {
return opens(Set.of(), pn);
}
/**
* Adds a service dependence.
*
* @param service
* The service type
*
* @return This builder
*
* @throws IllegalArgumentException
* If the service type is {@code null} or not a qualified name of
* a class in a named package
* @throws IllegalStateException
* If a dependency on the service type has already been declared
* or this is a builder for an automatic module
*/
public Builder uses(String service) {
if (automatic)
throw new IllegalStateException("Automatic modules can not declare"
+ " service dependences");
if (uses.contains(requireServiceTypeName(service)))
throw new IllegalStateException("Dependence upon service "
+ service + " already declared");
uses.add(service);
return this;
}
/**
* Provides a service with one or more implementations. The package for
* each {@link Provides#providers provider} (or provider factory) is
* added to the module if not already added.
*
* @param p
* The provides
*
* @return This builder
*
* @throws IllegalStateException
* If the providers for the service type have already been
* declared
*/
public Builder provides(Provides p) {
String service = p.service();
if (provides.containsKey(service))
throw new IllegalStateException("Providers of service "
+ service + " already declared");
provides.put(service, p);
p.providers().forEach(name -> packages.add(packageName(name)));
return this;
}
/**
* Provides implementations of a service. The package for each provider
* (or provider factory) is added to the module if not already added.
*
* @param service
* The service type
* @param providers
* The list of provider or provider factory class names
*
* @return This builder
*
* @throws IllegalArgumentException
* If the service type or any of the provider class names is
* {@code null} or not a qualified name of a class in a named
* package, or the list of provider class names is empty
* @throws IllegalStateException
* If the providers for the service type have already been
* declared
*/
public Builder provides(String service, List<String> providers) {
providers = new ArrayList<>(providers);
if (providers.isEmpty())
throw new IllegalArgumentException("Empty providers set");
if (strict) {
requireServiceTypeName(service);
providers.forEach(Checks::requireServiceProviderName);
} else {
// Disallow service/providers in unnamed package
String pn = packageName(service);
if (pn.isEmpty()) {
throw new IllegalArgumentException(service
+ ": unnamed package");
}
for (String name : providers) {
pn = packageName(name);
if (pn.isEmpty()) {
throw new IllegalArgumentException(name
+ ": unnamed package");
}
}
}
Provides p = new Provides(service, providers);
return provides(p);
}
/**
* Adds packages to the module. All packages in the set of package names
* that are not in the module are added to module.
*
* @param pns
* The (possibly empty) set of package names
*
* @return This builder
*
* @throws IllegalArgumentException
* If any of the package names is {@code null} or is not a
* legal package name
*/
public Builder packages(Set<String> pns) {
if (strict) {
pns = new HashSet<>(pns);
pns.forEach(Checks::requirePackageName);
}
this.packages.addAll(pns);
return this;
}
/**
* Sets the module version.
*
* @param v
* The version
*
* @return This builder
*/
public Builder version(Version v) {
version = requireNonNull(v);
rawVersionString = null;
return this;
}
/**
* Sets the module version.
*
* @param vs
* The version string to parse
*
* @return This builder
*
* @throws IllegalArgumentException
* If {@code vs} is {@code null} or cannot be parsed as a
* version string
*
* @see Version#parse(String)
*/
public Builder version(String vs) {
try {
version = Version.parse(vs);
rawVersionString = null;
} catch (IllegalArgumentException e) {
if (strict) throw e;
version = null;
rawVersionString = vs;
}
return this;
}
/**
* Sets the module main class. The package for the main class is added
* to the module if not already added. In other words, this method is
* equivalent to first invoking this builder's {@link #packages(Set)
* packages} method to add the package name of the main class.
*
* @param mc
* The module main class
*
* @return This builder
*
* @throws IllegalArgumentException
* If {@code mainClass} is {@code null} or not a qualified
* name of a class in a named package
*/
public Builder mainClass(String mc) {
String pn;
if (strict) {
mc = requireQualifiedClassName("main class name", mc);
pn = packageName(mc);
assert !pn.isEmpty();
} else {
// Disallow main class in unnamed package
pn = packageName(mc);
if (pn.isEmpty()) {
throw new IllegalArgumentException(mc + ": unnamed package");
}
}
packages.add(pn);
mainClass = mc;
return this;
}
/**
* Builds and returns a {@code ModuleDescriptor} from its components.
*
* <p> The module will require "{@code java.base}" even if the dependence
* has not been declared (the exception is when building a module named
* "{@code java.base}" as it cannot require itself). The dependence on
* "{@code java.base}" will have the {@link
* java.lang.module.ModuleDescriptor.Requires.Modifier#MANDATED MANDATED}
* modifier if the dependence was not declared. </p>
*
* @return The module descriptor
*/
public ModuleDescriptor build() {
Set<Requires> requires = new HashSet<>(this.requires.values());
Set<Exports> exports = new HashSet<>(this.exports.values());
Set<Opens> opens = new HashSet<>(this.opens.values());
// add dependency on java.base
if (strict
&& !name.equals("java.base")
&& !this.requires.containsKey("java.base")) {
requires.add(new Requires(Set.of(Requires.Modifier.MANDATED),
"java.base",
null,
null));
}
Set<Provides> provides = new HashSet<>(this.provides.values());
return new ModuleDescriptor(name,
version,
rawVersionString,
modifiers,
requires,
exports,
opens,
uses,
provides,
packages,
mainClass);
}
}
/**
* Compares this module descriptor to another.
*
* <p> Two {@code ModuleDescriptor} objects are compared by comparing their
* module names lexicographically. Where the module names are equal then the
* module versions are compared. When comparing the module versions then a
* module descriptor with a version is considered to succeed a module
* descriptor that does not have a version. If both versions are {@linkplain
* Version#parse(String) unparseable} then the {@linkplain #rawVersion()
* raw version strings} are compared lexicographically. Where the module names
* are equal and the versions are equal (or not present in both), then the
* set of modifiers are compared. Sets of modifiers are compared by comparing
* a <em>binary value</em> computed for each set. If a modifier is present
* in the set then the bit at the position of its ordinal is {@code 1}
* in the binary value, otherwise {@code 0}. If the two set of modifiers
* are also equal then the other components of the module descriptors are
* compared in a manner that is consistent with {@code equals}. </p>
*
* @param that
* The module descriptor to compare
*
* @return A negative integer, zero, or a positive integer if this module
* descriptor is less than, equal to, or greater than the given
* module descriptor
*/
@Override
public int compareTo(ModuleDescriptor that) {
if (this == that) return 0;
int c = this.name().compareTo(that.name());
if (c != 0) return c;
c = compare(this.version, that.version);
if (c != 0) return c;
c = compare(this.rawVersionString, that.rawVersionString);
if (c != 0) return c;
long v1 = modsValue(this.modifiers());
long v2 = modsValue(that.modifiers());
c = Long.compare(v1, v2);
if (c != 0) return c;
c = compare(this.requires, that.requires);
if (c != 0) return c;
c = compare(this.packages, that.packages);
if (c != 0) return c;
c = compare(this.exports, that.exports);
if (c != 0) return c;
c = compare(this.opens, that.opens);
if (c != 0) return c;
c = compare(this.uses, that.uses);
if (c != 0) return c;
c = compare(this.provides, that.provides);
if (c != 0) return c;
c = compare(this.mainClass, that.mainClass);
if (c != 0) return c;
return 0;
}
/**
* Tests this module descriptor for equality with the given object.
*
* <p> If the given object is not a {@code ModuleDescriptor} then this
* method returns {@code false}. Two module descriptors are equal if each
* of their corresponding components is equal. </p>
*
* <p> This method satisfies the general contract of the {@link
* java.lang.Object#equals(Object) Object.equals} method. </p>
*
* @param ob
* the object to which this object is to be compared
*
* @return {@code true} if, and only if, the given object is a module
* descriptor that is equal to this module descriptor
*/
@Override
public boolean equals(Object ob) {
if (ob == this)
return true;
return (ob instanceof ModuleDescriptor that)
&& (name.equals(that.name)
&& modifiers.equals(that.modifiers)
&& requires.equals(that.requires)
&& Objects.equals(packages, that.packages)
&& exports.equals(that.exports)
&& opens.equals(that.opens)
&& uses.equals(that.uses)
&& provides.equals(that.provides)
&& Objects.equals(version, that.version)
&& Objects.equals(rawVersionString, that.rawVersionString)
&& Objects.equals(mainClass, that.mainClass));
}
/**
* Computes a hash code for this module descriptor.
*
* <p> The hash code is based upon the components of the module descriptor,
* and satisfies the general contract of the {@link Object#hashCode
* Object.hashCode} method. </p>
*
* @return The hash-code value for this module descriptor
*/
@Override
public int hashCode() {
int hc = hash;
if (hc == 0) {
hc = name.hashCode();
hc = hc * 43 + Objects.hashCode(modifiers);
hc = hc * 43 + requires.hashCode();
hc = hc * 43 + Objects.hashCode(packages);
hc = hc * 43 + exports.hashCode();
hc = hc * 43 + opens.hashCode();
hc = hc * 43 + uses.hashCode();
hc = hc * 43 + provides.hashCode();
hc = hc * 43 + Objects.hashCode(version);
hc = hc * 43 + Objects.hashCode(rawVersionString);
hc = hc * 43 + Objects.hashCode(mainClass);
if (hc == 0)
hc = -1;
hash = hc;
}
return hc;
}
private transient int hash; // cached hash code
/**
* <p> Returns a string describing the module. </p>
*
* @return A string describing the module
*/
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
if (isOpen())
sb.append("open ");
sb.append("module { name: ").append(toNameAndVersion());
if (!requires.isEmpty())
sb.append(", ").append(requires);
if (!uses.isEmpty())
sb.append(", uses: ").append(uses);
if (!exports.isEmpty())
sb.append(", exports: ").append(exports);
if (!opens.isEmpty())
sb.append(", opens: ").append(opens);
if (!provides.isEmpty()) {
sb.append(", provides: ").append(provides);
}
sb.append(" }");
return sb.toString();
}
/**
* Instantiates a builder to build a module descriptor.
*
* @param name
* The module name
* @param ms
* The set of module modifiers
*
* @return A new builder
*
* @throws IllegalArgumentException
* If the module name is {@code null} or is not a legal module
* name, or the set of modifiers contains {@link
* Modifier#AUTOMATIC AUTOMATIC} with other modifiers
*/
public static Builder newModule(String name, Set<Modifier> ms) {
Set<Modifier> mods = new HashSet<>(ms);
if (mods.contains(Modifier.AUTOMATIC) && mods.size() > 1)
throw new IllegalArgumentException("AUTOMATIC cannot be used with"
+ " other modifiers");
return new Builder(name, true, mods);
}
/**
* Instantiates a builder to build a module descriptor for a <em>normal</em>
* module. This method is equivalent to invoking {@link #newModule(String,Set)
* newModule} with an empty set of {@link ModuleDescriptor.Modifier modifiers}.
*
* @param name
* The module name
*
* @return A new builder
*
* @throws IllegalArgumentException
* If the module name is {@code null} or is not a legal module
* name
*/
public static Builder newModule(String name) {
return new Builder(name, true, Set.of());
}
/**
* Instantiates a builder to build a module descriptor for an open module.
* This method is equivalent to invoking {@link #newModule(String,Set)
* newModule} with the {@link ModuleDescriptor.Modifier#OPEN OPEN} modifier.
*
* <p> The builder for an open module cannot be used to declare any open
* packages. </p>
*
* @param name
* The module name
*
* @return A new builder that builds an open module
*
* @throws IllegalArgumentException
* If the module name is {@code null} or is not a legal module
* name
*/
public static Builder newOpenModule(String name) {
return new Builder(name, true, Set.of(Modifier.OPEN));
}
/**
* Instantiates a builder to build a module descriptor for an automatic
* module. This method is equivalent to invoking {@link #newModule(String,Set)
* newModule} with the {@link ModuleDescriptor.Modifier#AUTOMATIC AUTOMATIC}
* modifier.
*
* <p> The builder for an automatic module cannot be used to declare module
* or service dependences. It also cannot be used to declare any exported
* or open packages. </p>
*
* @param name
* The module name
*
* @return A new builder that builds an automatic module
*
* @throws IllegalArgumentException
* If the module name is {@code null} or is not a legal module
* name
*
* @see ModuleFinder#of(Path[])
*/
public static Builder newAutomaticModule(String name) {
return new Builder(name, true, Set.of(Modifier.AUTOMATIC));
}
/**
* Reads the binary form of a module declaration from an input stream
* as a module descriptor.
*
* <p> If the descriptor encoded in the input stream does not indicate a
* set of packages in the module then the {@code packageFinder} will be
* invoked. The set of packages that the {@code packageFinder} returns
* must include all the packages that the module exports, opens, as well
* as the packages of the service implementations that the module provides,
* and the package of the main class (if the module has a main class). If
* the {@code packageFinder} throws an {@link UncheckedIOException} then
* {@link IOException} cause will be re-thrown. </p>
*
* <p> If there are bytes following the module descriptor then it is
* implementation specific as to whether those bytes are read, ignored,
* or reported as an {@code InvalidModuleDescriptorException}. If this
* method fails with an {@code InvalidModuleDescriptorException} or {@code
* IOException} then it may do so after some, but not all, bytes have
* been read from the input stream. It is strongly recommended that the
* stream be promptly closed and discarded if an exception occurs. </p>
*
* @apiNote The {@code packageFinder} parameter is for use when reading
* module descriptors from legacy module-artifact formats that do not
* record the set of packages in the descriptor itself.
*
* @param in
* The input stream
* @param packageFinder
* A supplier that can produce the set of packages
*
* @return The module descriptor
*
* @throws InvalidModuleDescriptorException
* If an invalid module descriptor is detected or the set of
* packages returned by the {@code packageFinder} does not include
* all of the packages obtained from the module descriptor
* @throws IOException
* If an I/O error occurs reading from the input stream or {@code
* UncheckedIOException} is thrown by the package finder
*/
public static ModuleDescriptor read(InputStream in,
Supplier<Set<String>> packageFinder)
throws IOException
{
return ModuleInfo.read(in, requireNonNull(packageFinder)).descriptor();
}
/**
* Reads the binary form of a module declaration from an input stream as a
* module descriptor. This method works exactly as specified by the 2-arg
* {@link #read(InputStream,Supplier) read} method with the exception that
* a packager finder is not used to find additional packages when the
* module descriptor read from the stream does not indicate the set of
* packages.
*
* @param in
* The input stream
*
* @return The module descriptor
*
* @throws InvalidModuleDescriptorException
* If an invalid module descriptor is detected
* @throws IOException
* If an I/O error occurs reading from the input stream
*/
public static ModuleDescriptor read(InputStream in) throws IOException {
return ModuleInfo.read(in, null).descriptor();
}
/**
* Reads the binary form of a module declaration from a byte buffer
* as a module descriptor.
*
* <p> If the descriptor encoded in the byte buffer does not indicate a
* set of packages in the module then the {@code packageFinder} will be
* invoked. The set of packages that the {@code packageFinder} returns
* must include all the packages that the module exports, opens, as well
* as the packages of the service implementations that the module provides,
* and the package of the main class (if the module has a main class). If
* the {@code packageFinder} throws an {@link UncheckedIOException} then
* {@link IOException} cause will be re-thrown. </p>
*
* <p> The module descriptor is read from the buffer starting at index
* {@code p}, where {@code p} is the buffer's {@link ByteBuffer#position()
* position} when this method is invoked. Upon return the buffer's position
* will be equal to {@code p + n} where {@code n} is the number of bytes
* read from the buffer. </p>
*
* <p> If there are bytes following the module descriptor then it is
* implementation specific as to whether those bytes are read, ignored,
* or reported as an {@code InvalidModuleDescriptorException}. If this
* method fails with an {@code InvalidModuleDescriptorException} then it
* may do so after some, but not all, bytes have been read. </p>
*
* @apiNote The {@code packageFinder} parameter is for use when reading
* module descriptors from legacy module-artifact formats that do not
* record the set of packages in the descriptor itself.
*
* @param bb
* The byte buffer
* @param packageFinder
* A supplier that can produce the set of packages
*
* @return The module descriptor
*
* @throws InvalidModuleDescriptorException
* If an invalid module descriptor is detected or the set of
* packages returned by the {@code packageFinder} does not include
* all of the packages obtained from the module descriptor
*/
public static ModuleDescriptor read(ByteBuffer bb,
Supplier<Set<String>> packageFinder)
{
return ModuleInfo.read(bb, requireNonNull(packageFinder)).descriptor();
}
/**
* Reads the binary form of a module declaration from a byte buffer as a
* module descriptor. This method works exactly as specified by the 2-arg
* {@link #read(ByteBuffer,Supplier) read} method with the exception that a
* packager finder is not used to find additional packages when the module
* descriptor encoded in the buffer does not indicate the set of packages.
*
* @param bb
* The byte buffer
*
* @return The module descriptor
*
* @throws InvalidModuleDescriptorException
* If an invalid module descriptor is detected
*/
public static ModuleDescriptor read(ByteBuffer bb) {
return ModuleInfo.read(bb, null).descriptor();
}
private static String packageName(String cn) {
int index = cn.lastIndexOf('.');
return (index == -1) ? "" : cn.substring(0, index);
}
/**
* Returns a string containing the given set of modifiers and label.
*/
private static <M> String toString(Set<M> mods, String what) {
return (Stream.concat(mods.stream().map(e -> e.toString()
.toLowerCase(Locale.ROOT)),
Stream.of(what)))
.collect(Collectors.joining(" "));
}
private static <T extends Object & Comparable<? super T>>
int compare(T obj1, T obj2) {
if (obj1 != null) {
return (obj2 != null) ? obj1.compareTo(obj2) : 1;
} else {
return (obj2 == null) ? 0 : -1;
}
}
/**
* Compares two sets of {@code Comparable} objects.
*/
@SuppressWarnings("unchecked")
private static <T extends Object & Comparable<? super T>>
int compare(Set<T> s1, Set<T> s2) {
T[] a1 = (T[]) s1.toArray();
T[] a2 = (T[]) s2.toArray();
Arrays.sort(a1);
Arrays.sort(a2);
return Arrays.compare(a1, a2);
}
private static <E extends Enum<E>> long modsValue(Set<E> set) {
long value = 0;
for (Enum<E> e : set) {
value += 1 << e.ordinal();
}
return value;
}
static {
/**
* Setup the shared secret to allow code in other packages access
* private package methods in java.lang.module.
*/
jdk.internal.access.SharedSecrets
.setJavaLangModuleAccess(new jdk.internal.access.JavaLangModuleAccess() {
@Override
public Builder newModuleBuilder(String mn,
boolean strict,
Set<ModuleDescriptor.Modifier> modifiers) {
return new Builder(mn, strict, modifiers);
}
@Override
public Set<String> packages(ModuleDescriptor.Builder builder) {
return builder.packages();
}
@Override
public void requires(ModuleDescriptor.Builder builder,
Set<Requires.Modifier> ms,
String mn,
String rawCompiledVersion) {
builder.requires(ms, mn, rawCompiledVersion);
}
@Override
public Requires newRequires(Set<Requires.Modifier> ms, String mn, Version v) {
return new Requires(ms, mn, v, true);
}
@Override
public Exports newExports(Set<Exports.Modifier> ms, String source) {
return new Exports(ms, source, Set.of(), true);
}
@Override
public Exports newExports(Set<Exports.Modifier> ms,
String source,
Set<String> targets) {
return new Exports(ms, source, targets, true);
}
@Override
public Opens newOpens(Set<Opens.Modifier> ms,
String source,
Set<String> targets) {
return new Opens(ms, source, targets, true);
}
@Override
public Opens newOpens(Set<Opens.Modifier> ms, String source) {
return new Opens(ms, source, Set.of(), true);
}
@Override
public Provides newProvides(String service, List<String> providers) {
return new Provides(service, providers, true);
}
@Override
public ModuleDescriptor newModuleDescriptor(String name,
Version version,
Set<ModuleDescriptor.Modifier> modifiers,
Set<Requires> requires,
Set<Exports> exports,
Set<Opens> opens,
Set<String> uses,
Set<Provides> provides,
Set<String> packages,
String mainClass,
int hashCode) {
return new ModuleDescriptor(name,
version,
modifiers,
requires,
exports,
opens,
uses,
provides,
packages,
mainClass,
hashCode,
false);
}
@Override
public Configuration resolveAndBind(ModuleFinder finder,
Collection<String> roots,
PrintStream traceOutput)
{
return Configuration.resolveAndBind(finder, roots, traceOutput);
}
@Override
public Configuration newConfiguration(ModuleFinder finder,
Map<String, Set<String>> graph) {
return new Configuration(finder, graph);
}
});
}
}
⏎ java/lang/module/ModuleDescriptor.java
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