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⏎ java/lang/reflect/Field.java
/*
* Copyright (c) 1996, 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.reflect;
import jdk.internal.access.SharedSecrets;
import jdk.internal.reflect.CallerSensitive;
import jdk.internal.reflect.FieldAccessor;
import jdk.internal.reflect.Reflection;
import jdk.internal.vm.annotation.ForceInline;
import sun.reflect.generics.repository.FieldRepository;
import sun.reflect.generics.factory.CoreReflectionFactory;
import sun.reflect.generics.factory.GenericsFactory;
import sun.reflect.generics.scope.ClassScope;
import java.lang.annotation.Annotation;
import java.util.Map;
import java.util.Objects;
import sun.reflect.annotation.AnnotationParser;
import sun.reflect.annotation.AnnotationSupport;
import sun.reflect.annotation.TypeAnnotation;
import sun.reflect.annotation.TypeAnnotationParser;
/**
* A {@code Field} provides information about, and dynamic access to, a
* single field of a class or an interface. The reflected field may
* be a class (static) field or an instance field.
*
* <p>A {@code Field} permits widening conversions to occur during a get or
* set access operation, but throws an {@code IllegalArgumentException} if a
* narrowing conversion would occur.
*
* @see Member
* @see java.lang.Class
* @see java.lang.Class#getFields()
* @see java.lang.Class#getField(String)
* @see java.lang.Class#getDeclaredFields()
* @see java.lang.Class#getDeclaredField(String)
*
* @author Kenneth Russell
* @author Nakul Saraiya
* @since 1.1
*/
public final
class Field extends AccessibleObject implements Member {
private Class<?> clazz;
private int slot;
// This is guaranteed to be interned by the VM in the 1.4
// reflection implementation
private String name;
private Class<?> type;
private int modifiers;
private boolean trustedFinal;
// Generics and annotations support
private transient String signature;
// generic info repository; lazily initialized
private transient FieldRepository genericInfo;
private byte[] annotations;
// Cached field accessor created without override
private FieldAccessor fieldAccessor;
// Cached field accessor created with override
private FieldAccessor overrideFieldAccessor;
// For sharing of FieldAccessors. This branching structure is
// currently only two levels deep (i.e., one root Field and
// potentially many Field objects pointing to it.)
//
// If this branching structure would ever contain cycles, deadlocks can
// occur in annotation code.
private Field root;
// Generics infrastructure
private String getGenericSignature() {return signature;}
// Accessor for factory
private GenericsFactory getFactory() {
Class<?> c = getDeclaringClass();
// create scope and factory
return CoreReflectionFactory.make(c, ClassScope.make(c));
}
// Accessor for generic info repository
private FieldRepository getGenericInfo() {
// lazily initialize repository if necessary
if (genericInfo == null) {
// create and cache generic info repository
genericInfo = FieldRepository.make(getGenericSignature(),
getFactory());
}
return genericInfo; //return cached repository
}
/**
* Package-private constructor
*/
@SuppressWarnings("deprecation")
Field(Class<?> declaringClass,
String name,
Class<?> type,
int modifiers,
boolean trustedFinal,
int slot,
String signature,
byte[] annotations)
{
this.clazz = declaringClass;
this.name = name;
this.type = type;
this.modifiers = modifiers;
this.trustedFinal = trustedFinal;
this.slot = slot;
this.signature = signature;
this.annotations = annotations;
}
/**
* Package-private routine (exposed to java.lang.Class via
* ReflectAccess) which returns a copy of this Field. The copy's
* "root" field points to this Field.
*/
Field copy() {
// This routine enables sharing of FieldAccessor objects
// among Field objects which refer to the same underlying
// method in the VM. (All of this contortion is only necessary
// because of the "accessibility" bit in AccessibleObject,
// which implicitly requires that new java.lang.reflect
// objects be fabricated for each reflective call on Class
// objects.)
if (this.root != null)
throw new IllegalArgumentException("Can not copy a non-root Field");
Field res = new Field(clazz, name, type, modifiers, trustedFinal, slot, signature, annotations);
res.root = this;
// Might as well eagerly propagate this if already present
res.fieldAccessor = fieldAccessor;
res.overrideFieldAccessor = overrideFieldAccessor;
return res;
}
/**
* @throws InaccessibleObjectException {@inheritDoc}
* @throws SecurityException {@inheritDoc}
*/
@Override
@CallerSensitive
public void setAccessible(boolean flag) {
AccessibleObject.checkPermission();
if (flag) checkCanSetAccessible(Reflection.getCallerClass());
setAccessible0(flag);
}
@Override
void checkCanSetAccessible(Class<?> caller) {
checkCanSetAccessible(caller, clazz);
}
/**
* Returns the {@code Class} object representing the class or interface
* that declares the field represented by this {@code Field} object.
*/
@Override
public Class<?> getDeclaringClass() {
return clazz;
}
/**
* Returns the name of the field represented by this {@code Field} object.
*/
public String getName() {
return name;
}
/**
* Returns the Java language modifiers for the field represented
* by this {@code Field} object, as an integer. The {@code Modifier} class should
* be used to decode the modifiers.
*
* @see Modifier
* @jls 8.3 Field Declarations
* @jls 9.3 Field (Constant) Declarations
*/
public int getModifiers() {
return modifiers;
}
/**
* Returns {@code true} if this field represents an element of
* an enumerated class; returns {@code false} otherwise.
*
* @return {@code true} if and only if this field represents an element of
* an enumerated class.
* @since 1.5
* @jls 8.9.1 Enum Constants
*/
public boolean isEnumConstant() {
return (getModifiers() & Modifier.ENUM) != 0;
}
/**
* Returns {@code true} if this field is a synthetic
* field; returns {@code false} otherwise.
*
* @return true if and only if this field is a synthetic
* field as defined by the Java Language Specification.
* @since 1.5
* @see <a
* href="{@docRoot}/java.base/java/lang/reflect/package-summary.html#LanguageJvmModel">Java
* programming language and JVM modeling in core reflection</a>
*/
public boolean isSynthetic() {
return Modifier.isSynthetic(getModifiers());
}
/**
* Returns a {@code Class} object that identifies the
* declared type for the field represented by this
* {@code Field} object.
*
* @return a {@code Class} object identifying the declared
* type of the field represented by this object
*/
public Class<?> getType() {
return type;
}
/**
* Returns a {@code Type} object that represents the declared type for
* the field represented by this {@code Field} object.
*
* <p>If the declared type of the field is a parameterized type,
* the {@code Type} object returned must accurately reflect the
* actual type arguments used in the source code.
*
* <p>If the type of the underlying field is a type variable or a
* parameterized type, it is created. Otherwise, it is resolved.
*
* @return a {@code Type} object that represents the declared type for
* the field represented by this {@code Field} object
* @throws GenericSignatureFormatError if the generic field
* signature does not conform to the format specified in
* <cite>The Java Virtual Machine Specification</cite>
* @throws TypeNotPresentException if the generic type
* signature of the underlying field refers to a non-existent
* class or interface declaration
* @throws MalformedParameterizedTypeException if the generic
* signature of the underlying field refers to a parameterized type
* that cannot be instantiated for any reason
* @since 1.5
*/
public Type getGenericType() {
if (getGenericSignature() != null)
return getGenericInfo().getGenericType();
else
return getType();
}
/**
* Compares this {@code Field} against the specified object. Returns
* true if the objects are the same. Two {@code Field} objects are the same if
* they were declared by the same class and have the same name
* and type.
*/
public boolean equals(Object obj) {
if (obj instanceof Field other) {
return (getDeclaringClass() == other.getDeclaringClass())
&& (getName() == other.getName())
&& (getType() == other.getType());
}
return false;
}
/**
* Returns a hashcode for this {@code Field}. This is computed as the
* exclusive-or of the hashcodes for the underlying field's
* declaring class name and its name.
*/
public int hashCode() {
return getDeclaringClass().getName().hashCode() ^ getName().hashCode();
}
/**
* Returns a string describing this {@code Field}. The format is
* the access modifiers for the field, if any, followed
* by the field type, followed by a space, followed by
* the fully-qualified name of the class declaring the field,
* followed by a period, followed by the name of the field.
* For example:
* <pre>
* public static final int java.lang.Thread.MIN_PRIORITY
* private int java.io.FileDescriptor.fd
* </pre>
*
* <p>The modifiers are placed in canonical order as specified by
* "The Java Language Specification". This is {@code public},
* {@code protected} or {@code private} first, and then other
* modifiers in the following order: {@code static}, {@code final},
* {@code transient}, {@code volatile}.
*
* @return a string describing this {@code Field}
* @jls 8.3.1 Field Modifiers
*/
public String toString() {
int mod = getModifiers();
return (((mod == 0) ? "" : (Modifier.toString(mod) + " "))
+ getType().getTypeName() + " "
+ getDeclaringClass().getTypeName() + "."
+ getName());
}
@Override
String toShortString() {
return "field " + getDeclaringClass().getTypeName() + "." + getName();
}
/**
* Returns a string describing this {@code Field}, including
* its generic type. The format is the access modifiers for the
* field, if any, followed by the generic field type, followed by
* a space, followed by the fully-qualified name of the class
* declaring the field, followed by a period, followed by the name
* of the field.
*
* <p>The modifiers are placed in canonical order as specified by
* "The Java Language Specification". This is {@code public},
* {@code protected} or {@code private} first, and then other
* modifiers in the following order: {@code static}, {@code final},
* {@code transient}, {@code volatile}.
*
* @return a string describing this {@code Field}, including
* its generic type
*
* @since 1.5
* @jls 8.3.1 Field Modifiers
*/
public String toGenericString() {
int mod = getModifiers();
Type fieldType = getGenericType();
return (((mod == 0) ? "" : (Modifier.toString(mod) + " "))
+ fieldType.getTypeName() + " "
+ getDeclaringClass().getTypeName() + "."
+ getName());
}
/**
* Returns the value of the field represented by this {@code Field}, on
* the specified object. The value is automatically wrapped in an
* object if it has a primitive type.
*
* <p>The underlying field's value is obtained as follows:
*
* <p>If the underlying field is a static field, the {@code obj} argument
* is ignored; it may be null.
*
* <p>Otherwise, the underlying field is an instance field. If the
* specified {@code obj} argument is null, the method throws a
* {@code NullPointerException}. If the specified object is not an
* instance of the class or interface declaring the underlying
* field, the method throws an {@code IllegalArgumentException}.
*
* <p>If this {@code Field} object is enforcing Java language access control, and
* the underlying field is inaccessible, the method throws an
* {@code IllegalAccessException}.
* If the underlying field is static, the class that declared the
* field is initialized if it has not already been initialized.
*
* <p>Otherwise, the value is retrieved from the underlying instance
* or static field. If the field has a primitive type, the value
* is wrapped in an object before being returned, otherwise it is
* returned as is.
*
* <p>If the field is hidden in the type of {@code obj},
* the field's value is obtained according to the preceding rules.
*
* @param obj object from which the represented field's value is
* to be extracted
* @return the value of the represented field in object
* {@code obj}; primitive values are wrapped in an appropriate
* object before being returned
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is inaccessible.
* @throws IllegalArgumentException if the specified object is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof).
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public Object get(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
return getFieldAccessor(obj).get(obj);
}
/**
* Gets the value of a static or instance {@code boolean} field.
*
* @param obj the object to extract the {@code boolean} value
* from
* @return the value of the {@code boolean} field
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is inaccessible.
* @throws IllegalArgumentException if the specified object is not
* an instance of the class or interface declaring the
* underlying field (or a subclass or implementor
* thereof), or if the field value cannot be
* converted to the type {@code boolean} by a
* widening conversion.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public boolean getBoolean(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
return getFieldAccessor(obj).getBoolean(obj);
}
/**
* Gets the value of a static or instance {@code byte} field.
*
* @param obj the object to extract the {@code byte} value
* from
* @return the value of the {@code byte} field
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is inaccessible.
* @throws IllegalArgumentException if the specified object is not
* an instance of the class or interface declaring the
* underlying field (or a subclass or implementor
* thereof), or if the field value cannot be
* converted to the type {@code byte} by a
* widening conversion.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public byte getByte(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
return getFieldAccessor(obj).getByte(obj);
}
/**
* Gets the value of a static or instance field of type
* {@code char} or of another primitive type convertible to
* type {@code char} via a widening conversion.
*
* @param obj the object to extract the {@code char} value
* from
* @return the value of the field converted to type {@code char}
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is inaccessible.
* @throws IllegalArgumentException if the specified object is not
* an instance of the class or interface declaring the
* underlying field (or a subclass or implementor
* thereof), or if the field value cannot be
* converted to the type {@code char} by a
* widening conversion.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public char getChar(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
return getFieldAccessor(obj).getChar(obj);
}
/**
* Gets the value of a static or instance field of type
* {@code short} or of another primitive type convertible to
* type {@code short} via a widening conversion.
*
* @param obj the object to extract the {@code short} value
* from
* @return the value of the field converted to type {@code short}
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is inaccessible.
* @throws IllegalArgumentException if the specified object is not
* an instance of the class or interface declaring the
* underlying field (or a subclass or implementor
* thereof), or if the field value cannot be
* converted to the type {@code short} by a
* widening conversion.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public short getShort(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
return getFieldAccessor(obj).getShort(obj);
}
/**
* Gets the value of a static or instance field of type
* {@code int} or of another primitive type convertible to
* type {@code int} via a widening conversion.
*
* @param obj the object to extract the {@code int} value
* from
* @return the value of the field converted to type {@code int}
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is inaccessible.
* @throws IllegalArgumentException if the specified object is not
* an instance of the class or interface declaring the
* underlying field (or a subclass or implementor
* thereof), or if the field value cannot be
* converted to the type {@code int} by a
* widening conversion.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public int getInt(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
return getFieldAccessor(obj).getInt(obj);
}
/**
* Gets the value of a static or instance field of type
* {@code long} or of another primitive type convertible to
* type {@code long} via a widening conversion.
*
* @param obj the object to extract the {@code long} value
* from
* @return the value of the field converted to type {@code long}
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is inaccessible.
* @throws IllegalArgumentException if the specified object is not
* an instance of the class or interface declaring the
* underlying field (or a subclass or implementor
* thereof), or if the field value cannot be
* converted to the type {@code long} by a
* widening conversion.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public long getLong(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
return getFieldAccessor(obj).getLong(obj);
}
/**
* Gets the value of a static or instance field of type
* {@code float} or of another primitive type convertible to
* type {@code float} via a widening conversion.
*
* @param obj the object to extract the {@code float} value
* from
* @return the value of the field converted to type {@code float}
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is inaccessible.
* @throws IllegalArgumentException if the specified object is not
* an instance of the class or interface declaring the
* underlying field (or a subclass or implementor
* thereof), or if the field value cannot be
* converted to the type {@code float} by a
* widening conversion.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public float getFloat(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
return getFieldAccessor(obj).getFloat(obj);
}
/**
* Gets the value of a static or instance field of type
* {@code double} or of another primitive type convertible to
* type {@code double} via a widening conversion.
*
* @param obj the object to extract the {@code double} value
* from
* @return the value of the field converted to type {@code double}
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is inaccessible.
* @throws IllegalArgumentException if the specified object is not
* an instance of the class or interface declaring the
* underlying field (or a subclass or implementor
* thereof), or if the field value cannot be
* converted to the type {@code double} by a
* widening conversion.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public double getDouble(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
return getFieldAccessor(obj).getDouble(obj);
}
/**
* Sets the field represented by this {@code Field} object on the
* specified object argument to the specified new value. The new
* value is automatically unwrapped if the underlying field has a
* primitive type.
*
* <p>The operation proceeds as follows:
*
* <p>If the underlying field is static, the {@code obj} argument is
* ignored; it may be null.
*
* <p>Otherwise the underlying field is an instance field. If the
* specified object argument is null, the method throws a
* {@code NullPointerException}. If the specified object argument is not
* an instance of the class or interface declaring the underlying
* field, the method throws an {@code IllegalArgumentException}.
*
* <p>If this {@code Field} object is enforcing Java language access control, and
* the underlying field is inaccessible, the method throws an
* {@code IllegalAccessException}.
*
* <p>If the underlying field is final, this {@code Field} object has
* <em>write</em> access if and only if the following conditions are met:
* <ul>
* <li>{@link #setAccessible(boolean) setAccessible(true)} has succeeded for
* this {@code Field} object;</li>
* <li>the field is non-static; and</li>
* <li>the field's declaring class is not a {@linkplain Class#isHidden()
* hidden class}; and</li>
* <li>the field's declaring class is not a {@linkplain Class#isRecord()
* record class}.</li>
* </ul>
* If any of the above checks is not met, this method throws an
* {@code IllegalAccessException}.
*
* <p> Setting a final field in this way
* is meaningful only during deserialization or reconstruction of
* instances of classes with blank final fields, before they are
* made available for access by other parts of a program. Use in
* any other context may have unpredictable effects, including cases
* in which other parts of a program continue to use the original
* value of this field.
*
* <p>If the underlying field is of a primitive type, an unwrapping
* conversion is attempted to convert the new value to a value of
* a primitive type. If this attempt fails, the method throws an
* {@code IllegalArgumentException}.
*
* <p>If, after possible unwrapping, the new value cannot be
* converted to the type of the underlying field by an identity or
* widening conversion, the method throws an
* {@code IllegalArgumentException}.
*
* <p>If the underlying field is static, the class that declared the
* field is initialized if it has not already been initialized.
*
* <p>The field is set to the possibly unwrapped and widened new value.
*
* <p>If the field is hidden in the type of {@code obj},
* the field's value is set according to the preceding rules.
*
* @param obj the object whose field should be modified
* @param value the new value for the field of {@code obj}
* being modified
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is inaccessible or final;
* or if this {@code Field} object has no write access.
* @throws IllegalArgumentException if the specified object is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof),
* or if an unwrapping conversion fails.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public void set(Object obj, Object value)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
getFieldAccessor(obj).set(obj, value);
}
/**
* Sets the value of a field as a {@code boolean} on the specified object.
* This method is equivalent to
* {@code set(obj, zObj)},
* where {@code zObj} is a {@code Boolean} object and
* {@code zObj.booleanValue() == z}.
*
* @param obj the object whose field should be modified
* @param z the new value for the field of {@code obj}
* being modified
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is either inaccessible or final;
* or if this {@code Field} object has no write access.
* @throws IllegalArgumentException if the specified object is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof),
* or if an unwrapping conversion fails.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public void setBoolean(Object obj, boolean z)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
getFieldAccessor(obj).setBoolean(obj, z);
}
/**
* Sets the value of a field as a {@code byte} on the specified object.
* This method is equivalent to
* {@code set(obj, bObj)},
* where {@code bObj} is a {@code Byte} object and
* {@code bObj.byteValue() == b}.
*
* @param obj the object whose field should be modified
* @param b the new value for the field of {@code obj}
* being modified
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is either inaccessible or final;
* or if this {@code Field} object has no write access.
* @throws IllegalArgumentException if the specified object is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof),
* or if an unwrapping conversion fails.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public void setByte(Object obj, byte b)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
getFieldAccessor(obj).setByte(obj, b);
}
/**
* Sets the value of a field as a {@code char} on the specified object.
* This method is equivalent to
* {@code set(obj, cObj)},
* where {@code cObj} is a {@code Character} object and
* {@code cObj.charValue() == c}.
*
* @param obj the object whose field should be modified
* @param c the new value for the field of {@code obj}
* being modified
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is either inaccessible or final;
* or if this {@code Field} object has no write access.
* @throws IllegalArgumentException if the specified object is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof),
* or if an unwrapping conversion fails.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public void setChar(Object obj, char c)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
getFieldAccessor(obj).setChar(obj, c);
}
/**
* Sets the value of a field as a {@code short} on the specified object.
* This method is equivalent to
* {@code set(obj, sObj)},
* where {@code sObj} is a {@code Short} object and
* {@code sObj.shortValue() == s}.
*
* @param obj the object whose field should be modified
* @param s the new value for the field of {@code obj}
* being modified
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is either inaccessible or final;
* or if this {@code Field} object has no write access.
* @throws IllegalArgumentException if the specified object is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof),
* or if an unwrapping conversion fails.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public void setShort(Object obj, short s)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
getFieldAccessor(obj).setShort(obj, s);
}
/**
* Sets the value of a field as an {@code int} on the specified object.
* This method is equivalent to
* {@code set(obj, iObj)},
* where {@code iObj} is an {@code Integer} object and
* {@code iObj.intValue() == i}.
*
* @param obj the object whose field should be modified
* @param i the new value for the field of {@code obj}
* being modified
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is either inaccessible or final;
* or if this {@code Field} object has no write access.
* @throws IllegalArgumentException if the specified object is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof),
* or if an unwrapping conversion fails.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public void setInt(Object obj, int i)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
getFieldAccessor(obj).setInt(obj, i);
}
/**
* Sets the value of a field as a {@code long} on the specified object.
* This method is equivalent to
* {@code set(obj, lObj)},
* where {@code lObj} is a {@code Long} object and
* {@code lObj.longValue() == l}.
*
* @param obj the object whose field should be modified
* @param l the new value for the field of {@code obj}
* being modified
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is either inaccessible or final;
* or if this {@code Field} object has no write access.
* @throws IllegalArgumentException if the specified object is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof),
* or if an unwrapping conversion fails.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public void setLong(Object obj, long l)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
getFieldAccessor(obj).setLong(obj, l);
}
/**
* Sets the value of a field as a {@code float} on the specified object.
* This method is equivalent to
* {@code set(obj, fObj)},
* where {@code fObj} is a {@code Float} object and
* {@code fObj.floatValue() == f}.
*
* @param obj the object whose field should be modified
* @param f the new value for the field of {@code obj}
* being modified
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is either inaccessible or final;
* or if this {@code Field} object has no write access.
* @throws IllegalArgumentException if the specified object is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof),
* or if an unwrapping conversion fails.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public void setFloat(Object obj, float f)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
getFieldAccessor(obj).setFloat(obj, f);
}
/**
* Sets the value of a field as a {@code double} on the specified object.
* This method is equivalent to
* {@code set(obj, dObj)},
* where {@code dObj} is a {@code Double} object and
* {@code dObj.doubleValue() == d}.
*
* @param obj the object whose field should be modified
* @param d the new value for the field of {@code obj}
* being modified
*
* @throws IllegalAccessException if this {@code Field} object
* is enforcing Java language access control and the underlying
* field is either inaccessible or final;
* or if this {@code Field} object has no write access.
* @throws IllegalArgumentException if the specified object is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof),
* or if an unwrapping conversion fails.
* @throws NullPointerException if the specified object is null
* and the field is an instance field.
* @throws ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
@CallerSensitive
@ForceInline // to ensure Reflection.getCallerClass optimization
public void setDouble(Object obj, double d)
throws IllegalArgumentException, IllegalAccessException
{
if (!override) {
Class<?> caller = Reflection.getCallerClass();
checkAccess(caller, obj);
}
getFieldAccessor(obj).setDouble(obj, d);
}
// check access to field
private void checkAccess(Class<?> caller, Object obj)
throws IllegalAccessException
{
checkAccess(caller, clazz,
Modifier.isStatic(modifiers) ? null : obj.getClass(),
modifiers);
}
// security check is done before calling this method
private FieldAccessor getFieldAccessor(Object obj)
throws IllegalAccessException
{
boolean ov = override;
FieldAccessor a = (ov) ? overrideFieldAccessor : fieldAccessor;
return (a != null) ? a : acquireFieldAccessor(ov);
}
// NOTE that there is no synchronization used here. It is correct
// (though not efficient) to generate more than one FieldAccessor
// for a given Field. However, avoiding synchronization will
// probably make the implementation more scalable.
private FieldAccessor acquireFieldAccessor(boolean overrideFinalCheck) {
// First check to see if one has been created yet, and take it
// if so
FieldAccessor tmp = null;
if (root != null) tmp = root.getFieldAccessor(overrideFinalCheck);
if (tmp != null) {
if (overrideFinalCheck)
overrideFieldAccessor = tmp;
else
fieldAccessor = tmp;
} else {
// Otherwise fabricate one and propagate it up to the root
tmp = reflectionFactory.newFieldAccessor(this, overrideFinalCheck);
setFieldAccessor(tmp, overrideFinalCheck);
}
return tmp;
}
// Returns FieldAccessor for this Field object, not looking up
// the chain to the root
private FieldAccessor getFieldAccessor(boolean overrideFinalCheck) {
return (overrideFinalCheck)? overrideFieldAccessor : fieldAccessor;
}
// Sets the FieldAccessor for this Field object and
// (recursively) its root
private void setFieldAccessor(FieldAccessor accessor, boolean overrideFinalCheck) {
if (overrideFinalCheck)
overrideFieldAccessor = accessor;
else
fieldAccessor = accessor;
// Propagate up
if (root != null) {
root.setFieldAccessor(accessor, overrideFinalCheck);
}
}
@Override
/* package-private */ Field getRoot() {
return root;
}
/* package-private */ boolean isTrustedFinal() {
return trustedFinal;
}
/**
* {@inheritDoc}
*
* @throws NullPointerException {@inheritDoc}
* @since 1.5
*/
@Override
public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
Objects.requireNonNull(annotationClass);
return annotationClass.cast(declaredAnnotations().get(annotationClass));
}
/**
* {@inheritDoc}
*
* @throws NullPointerException {@inheritDoc}
* @since 1.8
*/
@Override
public <T extends Annotation> T[] getAnnotationsByType(Class<T> annotationClass) {
Objects.requireNonNull(annotationClass);
return AnnotationSupport.getDirectlyAndIndirectlyPresent(declaredAnnotations(), annotationClass);
}
/**
* {@inheritDoc}
*/
@Override
public Annotation[] getDeclaredAnnotations() {
return AnnotationParser.toArray(declaredAnnotations());
}
private transient volatile Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
private Map<Class<? extends Annotation>, Annotation> declaredAnnotations() {
Map<Class<? extends Annotation>, Annotation> declAnnos;
if ((declAnnos = declaredAnnotations) == null) {
synchronized (this) {
if ((declAnnos = declaredAnnotations) == null) {
Field root = this.root;
if (root != null) {
declAnnos = root.declaredAnnotations();
} else {
declAnnos = AnnotationParser.parseAnnotations(
annotations,
SharedSecrets.getJavaLangAccess()
.getConstantPool(getDeclaringClass()),
getDeclaringClass());
}
declaredAnnotations = declAnnos;
}
}
}
return declAnnos;
}
private native byte[] getTypeAnnotationBytes0();
/**
* Returns an AnnotatedType object that represents the use of a type to specify
* the declared type of the field represented by this Field.
* @return an object representing the declared type of the field
* represented by this Field
*
* @since 1.8
*/
public AnnotatedType getAnnotatedType() {
return TypeAnnotationParser.buildAnnotatedType(getTypeAnnotationBytes0(),
SharedSecrets.getJavaLangAccess().
getConstantPool(getDeclaringClass()),
this,
getDeclaringClass(),
getGenericType(),
TypeAnnotation.TypeAnnotationTarget.FIELD);
}
}
⏎ java/lang/reflect/Field.java
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