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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2003 Shigeru Chiba. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*/
package javassist.convert;
import javassist.bytecode.*;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtField;
import javassist.CannotCompileException;
import javassist.NotFoundException;
import javassist.Modifier;
public class TransformReadField extends Transformer {
protected String fieldname;
protected CtClass fieldClass;
protected boolean isPrivate;
protected String methodClassname, methodName;
public TransformReadField(Transformer next, CtField field,
String methodClassname, String methodName)
{
super(next);
this.fieldClass = field.getDeclaringClass();
this.fieldname = field.getName();
this.methodClassname = methodClassname;
this.methodName = methodName;
this.isPrivate = Modifier.isPrivate(field.getModifiers());
}
static String isField(ClassPool pool, ConstPool cp, CtClass fclass,
String fname, boolean is_private, int index) {
if (!cp.getFieldrefName(index).equals(fname))
return null;
try {
CtClass c = pool.get(cp.getFieldrefClassName(index));
if (is_private ? c == fclass : c.subclassOf(fclass))
return cp.getFieldrefType(index);
}
catch (NotFoundException e) {}
return null;
}
public int transform(CtClass tclazz, int pos, CodeIterator iterator,
ConstPool cp) throws BadBytecode
{
int c = iterator.byteAt(pos);
if (c == GETFIELD || c == GETSTATIC) {
int index = iterator.u16bitAt(pos + 1);
String typedesc = isField(tclazz.getClassPool(), cp,
fieldClass, fieldname, isPrivate, index);
if (typedesc != null) {
if (c == GETSTATIC) {
iterator.move(pos);
iterator.insertGap(1); // insertGap() may insert 4 bytes.
iterator.writeByte(ACONST_NULL, pos);
pos = iterator.next();
}
String type = "(Ljava/lang/Object;)" + typedesc;
int mi = cp.addClassInfo(methodClassname);
int methodref = cp.addMethodrefInfo(mi, methodName, type);
iterator.writeByte(INVOKESTATIC, pos);
iterator.write16bit(methodref, pos + 1);
return pos;
}
}
return pos;
}
}
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