/**
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000,2002,2003 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package oracle.toplink.libraries.asm.attrs;
import oracle.toplink.libraries.asm.Attribute;
import oracle.toplink.libraries.asm.ByteVector;
import oracle.toplink.libraries.asm.ClassReader;
import oracle.toplink.libraries.asm.ClassWriter;
import oracle.toplink.libraries.asm.Label;
/**
* The AnnotationDefault attribute is a variable length attribute in the
* attributes table of certain method_info structures, namely those representing
* elements of annotation types. The AnnotationDefault attribute records the
* default value for the element represented by the method_info structure. Each
* method_info structures representing an element of an annotation types may contain
* at most one AnnotationDefault attribute. The JVM must make this default value
* available so it can be applied by appropriate reflective APIs.
* <p>
* The AnnotationDefault attribute has the following format:
* <pre>
* AnnotationDefault_attribute {
* u2 attribute_name_index;
* u4 attribute_length;
* element_value default_value;
* }
* </pre>
* The items of the AnnotationDefault structure are as follows:
* <dl>
* <dt>attribute_name_index</dt>
* <dd>The value of the attribute_name_index item must be a valid index into the
* constant_pool table. The constant_pool entry at that index must be a
* CONSTANT_Utf8_info structure representing the string "AnnotationDefault".</dd>
* <dt>attribute_length</dt>
* <dd>The value of the attribute_length item indicates the length of the attribute,
* excluding the initial six bytes. The value of the attribute_length item is
* thus dependent on the default value.</dd>
* <dt>default_value</dt>
* <dd>The default_value item represents the default value of the annotation type
* {@link oracle.toplink.libraries.asm.attrs.AnnotationElementValue element} whose default
* value is represented by this AnnotationDefault attribute.</dd>
* </dl>
*
* @see <a href="http://www.jcp.org/en/jsr/detail?id=175">JSR 175 : A Metadata
* Facility for the Java Programming Language</a>
*
* @author Eugene Kuleshov
*/
public class AnnotationDefaultAttribute extends Attribute {
/**
* Default value for annotation. Could be one of
* <code>Byte</code>, <code>Character</code>, <code>Double</code>,
* <code>Float</code>, <code>Integer</code>, <code>Long</code>, <code>Short</code>,
* <code>Boolean</code>, <code>String</code>,
* <code>Annotation.EnumConstValue</code>, <code>Type</code>,
* <code>Annotation</code> or <code>Object[]</code>.
*/
public Object defaultValue;
public AnnotationDefaultAttribute () {
super("AnnotationDefault");
}
public AnnotationDefaultAttribute ( Object defaultValue) {
this();
this.defaultValue = defaultValue;
}
protected Attribute read (ClassReader cr, int off,
int len, char[] buf, int codeOff, Label[] labels) {
return new AnnotationDefaultAttribute( Annotation.readValue(cr, new int[] {off}, buf));
}
protected ByteVector write (ClassWriter cw, byte[] code,
int len, int maxStack, int maxLocals) {
return Annotation.writeValue( new ByteVector(), defaultValue, cw);
}
/**
* Returns value in the format described in JSR-175 for Java source code.
*
* @return value in the format described in JSR-175 for Java source code.
*/
public String toString () {
return "default " + defaultValue;
}
}