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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
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package com.sun.org.apache.bcel.internal.generic;
/**
* BranchHandle is returned by specialized InstructionList.append() whenever a
* BranchInstruction is appended. This is useful when the target of this
* instruction is not known at time of creation and must be set later
* via setTarget().
*
* @see InstructionHandle
* @see Instruction
* @see InstructionList
* @version $Id$
*/
public final class BranchHandle extends InstructionHandle {
// This is also a cache in case the InstructionHandle#swapInstruction() method is used
// See BCEL-273
private BranchInstruction bi; // An alias in fact, but saves lots of casts
private BranchHandle(final BranchInstruction i) {
super(i);
bi = i;
}
/** Factory method.
*/
static BranchHandle getBranchHandle( final BranchInstruction i ) {
return new BranchHandle(i);
}
/* Override InstructionHandle methods: delegate to branch instruction.
* Through this overriding all access to the private i_position field should
* be prevented.
*/
@Override
public int getPosition() {
return bi.getPosition();
}
@Override
void setPosition( final int pos ) {
// Original code: i_position = bi.position = pos;
bi.setPosition(pos);
super.setPosition(pos);
}
@Override
protected int updatePosition( final int offset, final int max_offset ) {
final int x = bi.updatePosition(offset, max_offset);
super.setPosition(bi.getPosition());
return x;
}
/**
* Pass new target to instruction.
*/
public void setTarget( final InstructionHandle ih ) {
bi.setTarget(ih);
}
/**
* Update target of instruction.
*/
public void updateTarget( final InstructionHandle old_ih, final InstructionHandle new_ih ) {
bi.updateTarget(old_ih, new_ih);
}
/**
* @return target of instruction.
*/
public InstructionHandle getTarget() {
return bi.getTarget();
}
/**
* Set new contents. Old instruction is disposed and may not be used anymore.
*/
@Override // This is only done in order to apply the additional type check; could be merged with super impl.
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