| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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 |
| * |
| * 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 com.sun.org.apache.bcel.internal.generic; |
| |
| import com.sun.org.apache.bcel.internal.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. |
| * |
| * @see LineNumber |
| * @see MethodGen |
| */ |
| public class LineNumberGen implements InstructionTargeter, Cloneable { |
| |
| private InstructionHandle ih; |
| private int src_line; |
| |
| |
| /** |
| * Create a line number. |
| * |
| * @param ih instruction handle to reference |
| */ |
| public LineNumberGen(final InstructionHandle ih, final int src_line) { |
| setInstruction(ih); |
| setSourceLine(src_line); |
| } |
| |
| |
| /** |
| * @return true, if ih is target of this line number |
| */ |
| @Override |
| public boolean containsTarget( final InstructionHandle ih ) { |
| return this.ih == ih; |
| } |
| |
| |
| /** |
| * @param old_ih old target |
| * @param new_ih new target |
| */ |
| @Override |
| public void updateTarget( final InstructionHandle old_ih, final InstructionHandle new_ih ) { |
| if (old_ih != ih) { |
| throw new ClassGenException("Not targeting " + old_ih + ", but " + ih + "}"); |
| } |
| 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( final InstructionHandle ih ) { // TODO could be package-protected? |
| if (ih == null) { |
| throw new NullPointerException("InstructionHandle may not be null"); |
| } |
| BranchInstruction.notifyTarget(this.ih, ih, this); |
| this.ih = ih; |
| } |
| |
| |
| @Override |
| public Object clone() { |
| try { |
| return super.clone(); |
| } catch (final CloneNotSupportedException e) { |
| throw new Error("Clone Not Supported"); // never happens |
| } |
| } |
| |
| |
| public InstructionHandle getInstruction() { |
| return ih; |
| } |
| |
| |
| public void setSourceLine( final int src_line ) { // TODO could be package-protected? |
| this.src_line = src_line; |
| } |
| |
| |
| public int getSourceLine() { |
| return src_line; |
| } |
| } |