javassist.convert.Transformer Maven / Gradle / Ivy
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.convert;
import javassist.CannotCompileException;
import javassist.CtClass;
import javassist.bytecode.BadBytecode;
import javassist.bytecode.CodeAttribute;
import javassist.bytecode.CodeIterator;
import javassist.bytecode.ConstPool;
import javassist.bytecode.MethodInfo;
import javassist.bytecode.Opcode;
/**
* Transformer and its subclasses are used for executing
* code transformation specified by CodeConverter.
*
* @see javassist.CodeConverter
*/
public abstract class Transformer implements Opcode {
private Transformer next;
public Transformer(Transformer t) {
next = t;
}
public Transformer getNext() { return next; }
public void initialize(ConstPool cp, CodeAttribute attr) {}
public void initialize(ConstPool cp, CtClass clazz, MethodInfo minfo) throws CannotCompileException {
initialize(cp, minfo.getCodeAttribute());
}
public void clean() {}
public abstract int transform(CtClass clazz, int pos, CodeIterator it,
ConstPool cp) throws CannotCompileException, BadBytecode;
public int extraLocals() { return 0; }
public int extraStack() { return 0; }
}