| /* |
| * Copyright (c) 1996, 2006, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.lang.reflect; |
| |
| import sun.reflect.CallerSensitive; |
| 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} 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 |
| */ |
| 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; |
| |
| // 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} object representing the class or interface |
| * that declares the field represented by this {@code Field} object. |
| */ |
| 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 |
| */ |
| public int getModifiers() { |
| return modifiers; |
| } |
| |
| /** |
| * Returns {@code true} if this field represents an element of |
| * an enumerated type; returns {@code false} otherwise. |
| * |
| * @return {@code true} 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 {@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 |
| */ |
| 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 {@code Type} is a parameterized type, the |
| * {@code Type} 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 {@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 |
| * 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} 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 != 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}. 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}. |
| */ |
| public String toString() { |
| int mod = getModifiers(); |
| return (((mod == 0) ? "" : (Modifier.toString(mod) + " ")) |
| + getTypeName(getType()) + " " |
| + getTypeName(getDeclaringClass()) + "." |
| + 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 |
| */ |
| 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}, 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 |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and 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. |
| */ |
| @CallerSensitive |
| public Object get(Object obj) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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 |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and 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} 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 |
| */ |
| @CallerSensitive |
| public boolean getBoolean(Object obj) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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 |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and 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} 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 |
| */ |
| @CallerSensitive |
| public byte getByte(Object obj) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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} |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and 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} 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 |
| */ |
| @CallerSensitive |
| public char getChar(Object obj) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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} |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and 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} 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 |
| */ |
| @CallerSensitive |
| public short getShort(Object obj) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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} |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and 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} 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 |
| */ |
| @CallerSensitive |
| public int getInt(Object obj) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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} |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and 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} 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 |
| */ |
| @CallerSensitive |
| public long getLong(Object obj) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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} |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and 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} 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 |
| */ |
| @CallerSensitive |
| public float getFloat(Object obj) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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} |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and 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} 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 |
| */ |
| @CallerSensitive |
| public double getDouble(Object obj) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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, the method throws an |
| * {@code IllegalAccessException} unless {@code setAccessible(true)} |
| * has succeeded for this {@code Field} object |
| * and the 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}. |
| * |
| * <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 |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and the underlying |
| * field is either inaccessible or final. |
| * @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. |
| */ |
| @CallerSensitive |
| public void set(Object obj, Object value) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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 |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and the underlying |
| * field is either inaccessible or final. |
| * @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 |
| */ |
| @CallerSensitive |
| public void setBoolean(Object obj, boolean z) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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 |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and the underlying |
| * field is either inaccessible or final. |
| * @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 |
| */ |
| @CallerSensitive |
| public void setByte(Object obj, byte b) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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 |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and the underlying |
| * field is either inaccessible or final. |
| * @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 |
| */ |
| @CallerSensitive |
| public void setChar(Object obj, char c) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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 |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and the underlying |
| * field is either inaccessible or final. |
| * @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 |
| */ |
| @CallerSensitive |
| public void setShort(Object obj, short s) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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 a {@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 |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and the underlying |
| * field is either inaccessible or final. |
| * @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 |
| */ |
| @CallerSensitive |
| public void setInt(Object obj, int i) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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 |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and the underlying |
| * field is either inaccessible or final. |
| * @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 |
| */ |
| @CallerSensitive |
| public void setLong(Object obj, long l) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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 |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and the underlying |
| * field is either inaccessible or final. |
| * @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 |
| */ |
| @CallerSensitive |
| public void setFloat(Object obj, float f) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| 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 |
| * |
| * @exception IllegalAccessException if this {@code Field} object |
| * is enforcing Java language access control and the underlying |
| * field is either inaccessible or final. |
| * @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 |
| */ |
| @CallerSensitive |
| public void setDouble(Object obj, double d) |
| throws IllegalArgumentException, IllegalAccessException |
| { |
| if (!override) { |
| if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
| checkAccess(Reflection.getCallerClass(), clazz, obj, modifiers); |
| } |
| } |
| getFieldAccessor(obj).setDouble(obj, d); |
| } |
| |
| // 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); |
| } |
| } |
| |
| /* |
| * 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); |
| } |
| |
| /** |
| * @since 1.5 |
| */ |
| public Annotation[] getDeclaredAnnotations() { |
| return AnnotationParser.toArray(declaredAnnotations()); |
| } |
| |
| private transient Map<Class<? extends Annotation>, Annotation> declaredAnnotations; |
| |
| private synchronized Map<Class<? extends Annotation>, Annotation> declaredAnnotations() { |
| if (declaredAnnotations == null) { |
| declaredAnnotations = AnnotationParser.parseAnnotations( |
| annotations, sun.misc.SharedSecrets.getJavaLangAccess(). |
| getConstantPool(getDeclaringClass()), |
| getDeclaringClass()); |
| } |
| return declaredAnnotations; |
| } |
| } |
