/*
* @(#)Field.java 1.46 06/07/11
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.lang.reflect;
import sun.reflect.FieldAccessor;
import sun.reflect.Reflection;
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 sun.reflect.annotation.AnnotationParser;
/**
* A <code>Field</code> 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</code> permits widening conversions to occur during a get or
* set access operation, but throws an <code>IllegalArgumentException</code> 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
*/
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;
// 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.)
private Field root;
// More complicated security check cache needed here than for
// Class.newInstance() and Constructor.newInstance()
private Class securityCheckCache;
private Class securityCheckTargetClassCache;
// 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 used by ReflectAccess to enable
* instantiation of these objects in Java code from the java.lang
* package via sun.reflect.LangReflectAccess.
*/
Field(Class declaringClass,
String name,
Class type,
int modifiers,
int slot,
String signature,
byte[] annotations)
{
this.clazz = declaringClass;
this.name = name;
this.type = type;
this.modifiers = modifiers;
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.)
Field res = new Field(clazz, name, type, modifiers, slot, signature, annotations);
res.root = this;
// Might as well eagerly propagate this if already present
res.fieldAccessor = fieldAccessor;
res.overrideFieldAccessor = overrideFieldAccessor;
return res;
}
/**
* Returns the <code>Class</code> object representing the class or interface
* that declares the field represented by this <code>Field</code> object.
*/
public Class<?> getDeclaringClass() {
return clazz;
}
/**
* Returns the name of the field represented by this <code>Field</code> object.
*/
public String getName() {
return name;
}
/**
* Returns the Java language modifiers for the field represented
* by this <code>Field</code> object, as an integer. The <code>Modifier</code> class should
* be used to decode the modifiers.
*
* @see Modifier
*/
public int getModifiers() {
return modifiers;
}
/**
* Returns <tt>true</tt> if this field represents an element of
* an enumerated type; returns <tt>false</tt> otherwise.
*
* @return <tt>true</tt> if and only if this field represents an element of
* an enumerated type.
* @since 1.5
*/
public boolean isEnumConstant() {
return (getModifiers() & Modifier.ENUM) != 0;
}
/**
* Returns <tt>true</tt> if this field is a synthetic
* field; returns <tt>false</tt> otherwise.
*
* @return true if and only if this field is a synthetic
* field as defined by the Java Language Specification.
* @since 1.5
*/
public boolean isSynthetic() {
return Modifier.isSynthetic(getModifiers());
}
/**
* Returns a <code>Class</code> object that identifies the
* declared type for the field represented by this
* <code>Field</code> object.
*
* @return a <code>Class</code> object identifying the declared
* type of the field represented by this object
*/
public Class<?> getType() {
return type;
}
/**
* Returns a <tt>Type</tt> object that represents the declared type for
* the field represented by this <tt>Field</tt> object.
*
* <p>If the <tt>Type</tt> is a parameterized type, the
* <tt>Type</tt> object returned must accurately reflect the
* actual type parameters 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 <tt>Type</tt> object that represents the declared type for
* the field represented by this <tt>Field</tt> object
* @throws GenericSignatureFormatError if the generic field
* signature does not conform to the format specified in the Java
* Virtual Machine Specification, 3rd edition
* @throws TypeNotPresentException if the generic type
* signature of the underlying field refers to a non-existent
* type 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</code> against the specified object. Returns
* true if the objects are the same. Two <code>Field</code> 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 != null && obj instanceof Field) {
Field other = (Field)obj;
return (getDeclaringClass() == other.getDeclaringClass())
&& (getName() == other.getName())
&& (getType() == other.getType());
}
return false;
}
/**
* Returns a hashcode for this <code>Field</code>. 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</code>. 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 <tt>public</tt>,
* <tt>protected</tt> or <tt>private</tt> first, and then other
* modifiers in the following order: <tt>static</tt>, <tt>final</tt>,
* <tt>transient</tt>, <tt>volatile</tt>.
*/
public String toString() {
int mod = getModifiers();
return (((mod == 0) ? "" : (Modifier.toString(mod) + " "))
+ getTypeName(getType()) + " "
+ getTypeName(getDeclaringClass()) + "."
+ getName());
}
/**
* Returns a string describing this <code>Field</code>, 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 <tt>public</tt>,
* <tt>protected</tt> or <tt>private</tt> first, and then other
* modifiers in the following order: <tt>static</tt>, <tt>final</tt>,
* <tt>transient</tt>, <tt>volatile</tt>.
*
* @return a string describing this <code>Field</code>, including
* its generic type
*
* @since 1.5
*/
public String toGenericString() {
int mod = getModifiers();
Type fieldType = getGenericType();
return (((mod == 0) ? "" : (Modifier.toString(mod) + " "))
+ ((fieldType instanceof Class) ?
getTypeName((Class)fieldType): fieldType.toString())+ " "
+ getTypeName(getDeclaringClass()) + "."
+ getName());
}
/**
* Returns the value of the field represented by this <code>Field</code>, 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</code> argument
* is ignored; it may be null.
*
* <p>Otherwise, the underlying field is an instance field. If the
* specified <code>obj</code> argument is null, the method throws a
* <code>NullPointerException.</code> If the specified object is not an
* instance of the class or interface declaring the underlying
* field, the method throws an <code>IllegalArgumentException</code>.
*
* <p>If this <code>Field</code> object enforces Java language access control, and
* the underlying field is inaccessible, the method throws an
* <code>IllegalAccessException</code>.
* 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</code>,
* 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
* <tt>obj</tt>; primitive values are wrapped in an appropriate
* object before being returned
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception IllegalArgumentException if the specified object is not an
* instance of the class or interface declaring the underlying
* field (or a subclass or implementor thereof).
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
*/
public Object get(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
return getFieldAccessor(obj).get(obj);
}
/**
* Gets the value of a static or instance <code>boolean</code> field.
*
* @param obj the object to extract the <code>boolean</code> value
* from
* @return the value of the <code>boolean</code> field
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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</code> by a
* widening conversion.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
public boolean getBoolean(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
return getFieldAccessor(obj).getBoolean(obj);
}
/**
* Gets the value of a static or instance <code>byte</code> field.
*
* @param obj the object to extract the <code>byte</code> value
* from
* @return the value of the <code>byte</code> field
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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</code> by a
* widening conversion.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
public byte getByte(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
return getFieldAccessor(obj).getByte(obj);
}
/**
* Gets the value of a static or instance field of type
* <code>char</code> or of another primitive type convertible to
* type <code>char</code> via a widening conversion.
*
* @param obj the object to extract the <code>char</code> value
* from
* @return the value of the field converted to type <code>char</code>
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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</code> by a
* widening conversion.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
public char getChar(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
return getFieldAccessor(obj).getChar(obj);
}
/**
* Gets the value of a static or instance field of type
* <code>short</code> or of another primitive type convertible to
* type <code>short</code> via a widening conversion.
*
* @param obj the object to extract the <code>short</code> value
* from
* @return the value of the field converted to type <code>short</code>
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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</code> by a
* widening conversion.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
public short getShort(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
return getFieldAccessor(obj).getShort(obj);
}
/**
* Gets the value of a static or instance field of type
* <code>int</code> or of another primitive type convertible to
* type <code>int</code> via a widening conversion.
*
* @param obj the object to extract the <code>int</code> value
* from
* @return the value of the field converted to type <code>int</code>
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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</code> by a
* widening conversion.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
public int getInt(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
return getFieldAccessor(obj).getInt(obj);
}
/**
* Gets the value of a static or instance field of type
* <code>long</code> or of another primitive type convertible to
* type <code>long</code> via a widening conversion.
*
* @param obj the object to extract the <code>long</code> value
* from
* @return the value of the field converted to type <code>long</code>
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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</code> by a
* widening conversion.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
public long getLong(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
return getFieldAccessor(obj).getLong(obj);
}
/**
* Gets the value of a static or instance field of type
* <code>float</code> or of another primitive type convertible to
* type <code>float</code> via a widening conversion.
*
* @param obj the object to extract the <code>float</code> value
* from
* @return the value of the field converted to type <code>float</code>
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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</code> by a
* widening conversion.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
public float getFloat(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
return getFieldAccessor(obj).getFloat(obj);
}
/**
* Gets the value of a static or instance field of type
* <code>double</code> or of another primitive type convertible to
* type <code>double</code> via a widening conversion.
*
* @param obj the object to extract the <code>double</code> value
* from
* @return the value of the field converted to type <code>double</code>
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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</code> by a
* widening conversion.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#get
*/
public double getDouble(Object obj)
throws IllegalArgumentException, IllegalAccessException
{
return getFieldAccessor(obj).getDouble(obj);
}
/**
* Sets the field represented by this <code>Field</code> 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</code> 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</code>. If the specified object argument is not
* an instance of the class or interface declaring the underlying
* field, the method throws an <code>IllegalArgumentException</code>.
*
* <p>If this <code>Field</code> object enforces Java language access control, and
* the underlying field is inaccessible, the method throws an
* <code>IllegalAccessException</code>.
*
* <p>If the underlying field is final, the method throws an
* <code>IllegalAccessException</code> unless
* <code>setAccessible(true)</code> has succeeded for this field
* and this field is non-static. 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</code>.
*
* <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</code>.
*
* <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</code>,
* 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</code>
* being modified
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
*/
public void set(Object obj, Object value)
throws IllegalArgumentException, IllegalAccessException
{
getFieldAccessor(obj).set(obj, value);
}
/**
* Sets the value of a field as a <code>boolean</code> on the specified object.
* This method is equivalent to
* <code>set(obj, zObj)</code>,
* where <code>zObj</code> is a <code>Boolean</code> object and
* <code>zObj.booleanValue() == z</code>.
*
* @param obj the object whose field should be modified
* @param z the new value for the field of <code>obj</code>
* being modified
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
public void setBoolean(Object obj, boolean z)
throws IllegalArgumentException, IllegalAccessException
{
getFieldAccessor(obj).setBoolean(obj, z);
}
/**
* Sets the value of a field as a <code>byte</code> on the specified object.
* This method is equivalent to
* <code>set(obj, bObj)</code>,
* where <code>bObj</code> is a <code>Byte</code> object and
* <code>bObj.byteValue() == b</code>.
*
* @param obj the object whose field should be modified
* @param b the new value for the field of <code>obj</code>
* being modified
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
public void setByte(Object obj, byte b)
throws IllegalArgumentException, IllegalAccessException
{
getFieldAccessor(obj).setByte(obj, b);
}
/**
* Sets the value of a field as a <code>char</code> on the specified object.
* This method is equivalent to
* <code>set(obj, cObj)</code>,
* where <code>cObj</code> is a <code>Character</code> object and
* <code>cObj.charValue() == c</code>.
*
* @param obj the object whose field should be modified
* @param c the new value for the field of <code>obj</code>
* being modified
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
public void setChar(Object obj, char c)
throws IllegalArgumentException, IllegalAccessException
{
getFieldAccessor(obj).setChar(obj, c);
}
/**
* Sets the value of a field as a <code>short</code> on the specified object.
* This method is equivalent to
* <code>set(obj, sObj)</code>,
* where <code>sObj</code> is a <code>Short</code> object and
* <code>sObj.shortValue() == s</code>.
*
* @param obj the object whose field should be modified
* @param s the new value for the field of <code>obj</code>
* being modified
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
public void setShort(Object obj, short s)
throws IllegalArgumentException, IllegalAccessException
{
getFieldAccessor(obj).setShort(obj, s);
}
/**
* Sets the value of a field as an <code>int</code> on the specified object.
* This method is equivalent to
* <code>set(obj, iObj)</code>,
* where <code>iObj</code> is a <code>Integer</code> object and
* <code>iObj.intValue() == i</code>.
*
* @param obj the object whose field should be modified
* @param i the new value for the field of <code>obj</code>
* being modified
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
public void setInt(Object obj, int i)
throws IllegalArgumentException, IllegalAccessException
{
getFieldAccessor(obj).setInt(obj, i);
}
/**
* Sets the value of a field as a <code>long</code> on the specified object.
* This method is equivalent to
* <code>set(obj, lObj)</code>,
* where <code>lObj</code> is a <code>Long</code> object and
* <code>lObj.longValue() == l</code>.
*
* @param obj the object whose field should be modified
* @param l the new value for the field of <code>obj</code>
* being modified
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
public void setLong(Object obj, long l)
throws IllegalArgumentException, IllegalAccessException
{
getFieldAccessor(obj).setLong(obj, l);
}
/**
* Sets the value of a field as a <code>float</code> on the specified object.
* This method is equivalent to
* <code>set(obj, fObj)</code>,
* where <code>fObj</code> is a <code>Float</code> object and
* <code>fObj.floatValue() == f</code>.
*
* @param obj the object whose field should be modified
* @param f the new value for the field of <code>obj</code>
* being modified
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
public void setFloat(Object obj, float f)
throws IllegalArgumentException, IllegalAccessException
{
getFieldAccessor(obj).setFloat(obj, f);
}
/**
* Sets the value of a field as a <code>double</code> on the specified object.
* This method is equivalent to
* <code>set(obj, dObj)</code>,
* where <code>dObj</code> is a <code>Double</code> object and
* <code>dObj.doubleValue() == d</code>.
*
* @param obj the object whose field should be modified
* @param d the new value for the field of <code>obj</code>
* being modified
*
* @exception IllegalAccessException if the underlying field
* is inaccessible.
* @exception 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.
* @exception NullPointerException if the specified object is null
* and the field is an instance field.
* @exception ExceptionInInitializerError if the initialization provoked
* by this method fails.
* @see Field#set
*/
public void setDouble(Object obj, double d)
throws IllegalArgumentException, IllegalAccessException
{
getFieldAccessor(obj).setDouble(obj, d);
}
// Convenience routine which performs security checks
private FieldAccessor getFieldAccessor(Object obj)
throws IllegalAccessException
{
doSecurityCheck(obj);
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);
}
}
// NOTE: be very careful if you change the stack depth of this
// routine. The depth of the "getCallerClass" call is hardwired so
// that the compiler can have an easier time if this gets inlined.
private void doSecurityCheck(Object obj) throws IllegalAccessException {
if (!override) {
if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) {
Class caller = Reflection.getCallerClass(4);
Class targetClass = ((obj == null || !Modifier.isProtected(modifiers))
? clazz
: obj.getClass());
synchronized (this) {
if ((securityCheckCache == caller)
&& (securityCheckTargetClassCache == targetClass)) {
return;
}
}
Reflection.ensureMemberAccess(caller, clazz, obj, modifiers);
synchronized (this) {
securityCheckCache = caller;
securityCheckTargetClassCache = targetClass;
}
}
}
}
/*
* Utility routine to paper over array type names
*/
static String getTypeName(Class type) {
if (type.isArray()) {
try {
Class cl = type;
int dimensions = 0;
while (cl.isArray()) {
dimensions++;
cl = cl.getComponentType();
}
StringBuffer sb = new StringBuffer();
sb.append(cl.getName());
for (int i = 0; i < dimensions; i++) {
sb.append("[]");
}
return sb.toString();
} catch (Throwable e) { /*FALLTHRU*/ }
}
return type.getName();
}
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.5
*/
public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
if (annotationClass == null)
throw new NullPointerException();
return (T) declaredAnnotations().get(annotationClass);
}
private static final Annotation[] EMPTY_ANNOTATION_ARRAY=new Annotation[0];
/**
* @since 1.5
*/
public Annotation[] getDeclaredAnnotations() {
return declaredAnnotations().values().toArray(EMPTY_ANNOTATION_ARRAY);
}
private transient Map<Class, Annotation> declaredAnnotations;
private synchronized Map<Class, Annotation> declaredAnnotations() {
if (declaredAnnotations == null) {
declaredAnnotations = AnnotationParser.parseAnnotations(
annotations, sun.misc.SharedSecrets.getJavaLangAccess().
getConstantPool(getDeclaringClass()),
getDeclaringClass());
}
return declaredAnnotations;
}
}
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