/*
* Copyright 2000-2004 The Apache Software Foundation
*
* Licensed 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
*
* 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
* limitations under the License.
*
*/
package org.apache.bcel.generic;
import org.apache.bcel.classfile.LineNumber;
/**
* This class represents a line number within a method, i.e., give an instruction
* a line number corresponding to the source code line.
*
* @version $Id: LineNumberGen.java,v 1.5 2004/12/15 08:28:35 conor Exp $
* @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
* @see LineNumber
* @see MethodGen
*/
public class LineNumberGen
implements InstructionTargeter, Cloneable, java.io.Serializable
{
private InstructionHandle ih;
private int src_line;
/**
* Create a line number.
*
* @param ih instruction handle to reference
*/
public LineNumberGen(InstructionHandle ih, int src_line) {
setInstruction(ih);
setSourceLine(src_line);
}
/**
* @return true, if ih is target of this line number
*/
public boolean containsTarget(InstructionHandle ih) {
return this.ih == ih;
}
/**
* @param old_ih old target
* @param new_ih new target
*/
public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih) {
if(old_ih != ih)
throw new ClassGenException("Not targeting " + old_ih + ", but " + ih + "}");
else
setInstruction(new_ih);
}
/**
* Get LineNumber attribute .
*
* This relies on that the instruction list has already been dumped to byte code or
* or that the `setPositions' methods has been called for the instruction list.
*/
public LineNumber getLineNumber() {
return new LineNumber(ih.getPosition(), src_line);
}
public void setInstruction(InstructionHandle ih) {
BranchInstruction.notifyTarget(this.ih, ih, this);
this.ih = ih;
}
public Object clone() {
try {
return super.clone();
} catch(CloneNotSupportedException e) {
System.err.println(e);
return null;
}
}
public InstructionHandle getInstruction() { return ih; }
public void setSourceLine(int src_line) { this.src_line = src_line; }
public int getSourceLine() { return src_line; }
}