/**
* 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 EnclosingMethod attribute is an optional fixed-length attribute in
* the attributes table of the ClassFile structure. A class must have an
* EnclosingMethod attribute if and only if it is a local class or an
* anonymous class. A class may have no more than one EnclosingMethod attribute.
*
* The EnclosingMethod attribute has the following format:
* <pre>
* EnclosingMethod_attribute {
* u2 attribute_name_index;
* u4 attribute_length;
* u2 class_index
* u2 method_index;
* }
* </pre>
* The items of the EnclosingMethod_attribute 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 "EnclosingMethod".</dd>
* <dt>attribute_length</dt>
* <dd>The value of the attribute_length item is four.</dd>
* <dt>class_index</dt>
* <dd>The value of the class_index item must be a valid index into the
* constant_pool table. The constant_pool entry at that index must be a
* CONSTANT_Class_info structure representing the
* innermost class that encloses the declaration of the current class.</dd>
* <dt>method_index</dt>
* <dd>If the current class is not immediately enclosed by a method or
* constructor, then the value of the method_index item must be zero.
* Otherwise, the value of the method_index item must be a valid
* index into the constant_pool table. The constant_pool entry at that
* index must be a CONSTANT_NameAndType_info structure
* representing a the name and type of a method in the class
* referenced by the class_index attribute above. It is the
* responsibility of the Java compiler to ensure that the method
* identified via the method_index is indeed the closest lexically
* enclosing method of the class that contains this EnclosingMethod
* attribute.</dd>
* </dl>
*
* @author Eugene Kuleshov
*/
public class EnclosingMethodAttribute extends Attribute {
public String owner;
public String name;
public String desc;
public EnclosingMethodAttribute () {
super("EnclosingMethod");
}
public EnclosingMethodAttribute (String owner, String name, String desc) {
this();
this.owner = owner;
this.name = name;
this.desc = desc;
}
protected Attribute read (ClassReader cr, int off,
int len, char[] buf, int codeOff, Label[] labels) {
// CONSTANT_Class_info
String o = cr.readClass( off, buf);
// CONSTANT_NameAndType_info (skip CONSTANT_NameAndType tag)
int index = cr.getItem(cr.readUnsignedShort(off + 2));
String n = null;
String d = null;
if( index!=0) {
n = cr.readUTF8(index, buf);
d = cr.readUTF8(index + 2, buf);
}
return new EnclosingMethodAttribute( o, n, d);
}
protected ByteVector write (ClassWriter cw, byte[] code,
int len, int maxStack, int maxLocals) {
return new ByteVector().putShort(cw.newClass(owner))
.putShort( name==null || desc==null ? 0 : cw.newNameType(name, desc));
}
public String toString () {
return new StringBuffer("owner:").append( owner)
.append(" name:").append(name)
.append(" desc:").append(desc).toString();
}
}