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package org.aspectj.apache.bcel.classfile;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. 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. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*/
import org.aspectj.apache.bcel.Constants;
import org.aspectj.apache.bcel.classfile.annotation.RuntimeInvisibleAnnotations;
import org.aspectj.apache.bcel.classfile.annotation.RuntimeInvisibleParameterAnnotations;
import org.aspectj.apache.bcel.classfile.annotation.RuntimeVisibleAnnotations;
import org.aspectj.apache.bcel.classfile.annotation.RuntimeVisibleParameterAnnotations;
import java.io.*;
/**
* Abstract super class for Attribute objects. Currently the
* ConstantValue, SourceFile, Code,
* Exceptiontable, LineNumberTable,
* LocalVariableTable, InnerClasses and
* Synthetic attributes are supported. The
* Unknown attribute stands for non-standard-attributes.
*
* @version $Id: Attribute.java,v 1.4 2008/08/26 14:59:38 aclement Exp $
* @author M. Dahm
* @see ConstantValue
* @see SourceFile
* @see Code
* @see Unknown
* @see ExceptionTable
* @see LineNumberTable
* @see LocalVariableTable
* @see InnerClasses
* @see Synthetic
* @see Deprecated
* @see Signature
*/
public abstract class Attribute implements Cloneable, Node, Serializable {
public final static Attribute[] NoAttributes = new Attribute[0];
protected byte tag; // Tag to distinguish subclasses
protected int nameIndex; // Points to attribute name in constant pool
protected int length; // Content length of attribute field
protected ConstantPool constantPool;
protected Attribute(byte tag, int nameIndex, int length, ConstantPool constantPool) {
this.tag = tag;
this.nameIndex = nameIndex;
this.length = length;
this.constantPool = constantPool;
}
/** Dump attribute to file stream in binary format */
public void dump(DataOutputStream file) throws IOException {
file.writeShort(nameIndex);
file.writeInt(length);
}
public static final Attribute readAttribute(DataInputStream file, ConstantPool cpool) throws IOException {
byte tag = Constants.ATTR_UNKNOWN; // Unknown attribute
int idx = file.readUnsignedShort();
String name = cpool.getConstantUtf8(idx).getBytes();
int len = file.readInt();
// Compare strings to find known attribute
for (byte i=0; i < Constants.KNOWN_ATTRIBUTES; i++) {
if (name.equals(Constants.ATTRIBUTE_NAMES[i])) { tag = i; break; }
}
switch(tag) {
case Constants.ATTR_UNKNOWN: return new Unknown(idx, len, file, cpool);
case Constants.ATTR_CONSTANT_VALUE: return new ConstantValue(idx, len, file, cpool);
case Constants.ATTR_SOURCE_FILE: return new SourceFile(idx, len, file, cpool);
case Constants.ATTR_CODE: return new Code(idx, len, file, cpool);
case Constants.ATTR_EXCEPTIONS: return new ExceptionTable(idx, len, file, cpool);
case Constants.ATTR_LINE_NUMBER_TABLE: return new LineNumberTable(idx, len, file, cpool);
case Constants.ATTR_LOCAL_VARIABLE_TABLE: return new LocalVariableTable(idx, len, file, cpool);
case Constants.ATTR_INNER_CLASSES: return new InnerClasses(idx, len, file, cpool);
case Constants.ATTR_SYNTHETIC: return new Synthetic(idx, len, file, cpool);
case Constants.ATTR_DEPRECATED: return new Deprecated(idx, len, file, cpool);
case Constants.ATTR_PMG: return new PMGClass(idx, len, file, cpool);
case Constants.ATTR_SIGNATURE: return new Signature(idx, len, file, cpool);
case Constants.ATTR_STACK_MAP: return new StackMap(idx, len, file, cpool);
case Constants.ATTR_RUNTIME_VISIBLE_ANNOTATIONS:
return new RuntimeVisibleAnnotations(idx,len,file,cpool);
case Constants.ATTR_RUNTIME_INVISIBLE_ANNOTATIONS:
return new RuntimeInvisibleAnnotations(idx,len,file,cpool);
case Constants.ATTR_RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS:
return new RuntimeVisibleParameterAnnotations(idx,len,file,cpool);
case Constants.ATTR_RUNTIME_INVISIBLE_PARAMETER_ANNOTATIONS:
return new RuntimeInvisibleParameterAnnotations(idx,len,file,cpool);
case Constants.ATTR_ANNOTATION_DEFAULT:
return new AnnotationDefault(idx,len,file,cpool);
case Constants.ATTR_LOCAL_VARIABLE_TYPE_TABLE:
return new LocalVariableTypeTable(idx,len,file,cpool);
case Constants.ATTR_ENCLOSING_METHOD:
return new EnclosingMethod(idx,len,file,cpool);
default: throw new IllegalStateException();
}
}
public String getName() {
return constantPool.getConstantUtf8(nameIndex).getBytes();
}
public final int getLength() { return length; }
public final int getNameIndex() { return nameIndex; }
public final byte getTag() { return tag; }
public final ConstantPool getConstantPool() { return constantPool; }
/**
* Use copy() if you want to have a deep copy(), ie. with all references
* copied correctly.
*
* @return shallow copy of this attribute
*/
public Object clone() {
Object o = null;
try {
o = super.clone();
} catch(CloneNotSupportedException e) {
e.printStackTrace(); // Never occurs
}
return o;
}
/**
* @return deep copy of this attribute
*/
public abstract Attribute copy(ConstantPool constant_pool);
public String toString() {
return Constants.ATTRIBUTE_NAMES[tag];
}
public abstract void accept(ClassVisitor v);
}
