JDK 17 java.base.jmod - Base Module
JDK 17 java.base.jmod is the JMOD file for JDK 17 Base module.
JDK 17 Base module compiled class files are stored in \fyicenter\jdk-17.0.5\jmods\java.base.jmod.
JDK 17 Base module compiled class files are also linked and stored in the \fyicenter\jdk-17.0.5\lib\modules JImage file.
JDK 17 Base module source code files are stored in \fyicenter\jdk-17.0.5\lib\src.zip\java.base.
You can click and view the content of each source code file in the list below.
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⏎ java/lang/PublicMethods.java
/*
* Copyright (c) 2016, 2021, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.lang;
import jdk.internal.reflect.ReflectionFactory;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.security.AccessController;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* A collection of most specific public methods. Methods are added to it using
* {@link #merge(Method)} method. Only the most specific methods for a
* particular signature are kept.
*/
final class PublicMethods {
/**
* a map of (method name, parameter types) -> linked list of Method(s)
*/
private final Map<Key, MethodList> map = new LinkedHashMap<>();
/**
* keeps track of the number of collected methods
*/
private int methodCount;
/**
* Merges new method with existing methods. New method is either
* ignored (if a more specific method with same signature exists) or added
* to the collection. When it is added to the collection, it may replace one
* or more existing methods with same signature if they are less specific
* than added method.
* See comments in code...
*/
void merge(Method method) {
Key key = new Key(method);
MethodList existing = map.get(key);
int xLen = existing == null ? 0 : existing.length();
MethodList merged = MethodList.merge(existing, method);
methodCount += merged.length() - xLen;
// replace if head of list changed
if (merged != existing) {
map.put(key, merged);
}
}
/**
* Dumps methods to array.
*/
Method[] toArray() {
Method[] array = new Method[methodCount];
int i = 0;
for (MethodList ml : map.values()) {
for (; ml != null; ml = ml.next) {
array[i++] = ml.method;
}
}
return array;
}
/**
* Method (name, parameter types) tuple.
*/
private static final class Key {
@SuppressWarnings("removal")
private static final ReflectionFactory reflectionFactory =
AccessController.doPrivileged(
new ReflectionFactory.GetReflectionFactoryAction());
private final String name; // must be interned (as from Method.getName())
private final Class<?>[] ptypes;
Key(Method method) {
name = method.getName();
ptypes = reflectionFactory.getExecutableSharedParameterTypes(method);
}
static boolean matches(Method method,
String name, // may not be interned
Class<?>[] ptypes) {
return method.getName().equals(name) &&
Arrays.equals(
reflectionFactory.getExecutableSharedParameterTypes(method),
ptypes
);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
//noinspection StringEquality (guaranteed interned String(s))
return (o instanceof Key that)
&& name == that.name
&& Arrays.equals(ptypes, that.ptypes);
}
@Override
public int hashCode() {
return System.identityHashCode(name) + // guaranteed interned String
31 * Arrays.hashCode(ptypes);
}
}
/**
* Node of a inked list containing Method(s) sharing the same
* (name, parameter types) tuple.
*/
static final class MethodList {
Method method;
MethodList next;
private MethodList(Method method) {
this.method = method;
}
/**
* @return the head of a linked list containing given {@code methods}
* filtered by given method {@code name}, parameter types
* {@code ptypes} and including or excluding static methods as
* requested by {@code includeStatic} flag.
*/
static MethodList filter(Method[] methods, String name,
Class<?>[] ptypes, boolean includeStatic) {
MethodList head = null, tail = null;
for (Method method : methods) {
if ((includeStatic || !Modifier.isStatic(method.getModifiers())) &&
Key.matches(method, name, ptypes)) {
if (tail == null) {
head = tail = new MethodList(method);
} else {
tail = tail.next = new MethodList(method);
}
}
}
return head;
}
/**
* This method should only be called with the {@code head} (possibly null)
* of a list of Method(s) that share the same (method name, parameter types)
* and another {@code methodList} that also contains Method(s) with the
* same and equal (method name, parameter types) as the 1st list.
* It modifies the 1st list and returns the head of merged list
* containing only the most specific methods for each signature
* (i.e. return type). The returned head of the merged list may or
* may not be the same as the {@code head} of the given list.
* The given {@code methodList} is not modified.
*/
static MethodList merge(MethodList head, MethodList methodList) {
for (MethodList ml = methodList; ml != null; ml = ml.next) {
head = merge(head, ml.method);
}
return head;
}
private static MethodList merge(MethodList head, Method method) {
Class<?> dclass = method.getDeclaringClass();
Class<?> rtype = method.getReturnType();
MethodList prev = null;
for (MethodList l = head; l != null; l = l.next) {
// eXisting method
Method xmethod = l.method;
// only merge methods with same signature:
// (return type, name, parameter types) tuple
// as we only keep methods with same (name, parameter types)
// tuple together in one list, we only need to check return type
if (rtype == xmethod.getReturnType()) {
Class<?> xdclass = xmethod.getDeclaringClass();
if (dclass.isInterface() == xdclass.isInterface()) {
// both methods are declared by interfaces
// or both by classes
if (dclass.isAssignableFrom(xdclass)) {
// existing method is the same or overrides
// new method - ignore new method
return head;
}
if (xdclass.isAssignableFrom(dclass)) {
// new method overrides existing
// method - knock out existing method
if (prev != null) {
prev.next = l.next;
} else {
head = l.next;
}
// keep iterating
} else {
// unrelated (should only happen for interfaces)
prev = l;
// keep iterating
}
} else if (dclass.isInterface()) {
// new method is declared by interface while
// existing method is declared by class -
// ignore new method
return head;
} else /* xdclass.isInterface() */ {
// new method is declared by class while
// existing method is declared by interface -
// knock out existing method
if (prev != null) {
prev.next = l.next;
} else {
head = l.next;
}
// keep iterating
}
} else {
// distinct signatures
prev = l;
// keep iterating
}
}
// append new method to the list
if (prev == null) {
head = new MethodList(method);
} else {
prev.next = new MethodList(method);
}
return head;
}
private int length() {
int len = 1;
for (MethodList ml = next; ml != null; ml = ml.next) {
len++;
}
return len;
}
/**
* @return 1st method in list with most specific return type
*/
Method getMostSpecific() {
Method m = method;
Class<?> rt = m.getReturnType();
for (MethodList ml = next; ml != null; ml = ml.next) {
Method m2 = ml.method;
Class<?> rt2 = m2.getReturnType();
if (rt2 != rt && rt.isAssignableFrom(rt2)) {
// found more specific return type
m = m2;
rt = rt2;
}
}
return m;
}
}
}
⏎ java/lang/PublicMethods.java
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