001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one or more
003 *  contributor license agreements.  See the NOTICE file distributed with
004 *  this work for additional information regarding copyright ownership.
005 *  The ASF licenses this file to You under the Apache License, Version 2.0
006 *  (the "License"); you may not use this file except in compliance with
007 *  the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 */
017package org.apache.commons.compress.harmony.unpack200.bytecode;
018
019import java.io.DataOutputStream;
020import java.io.IOException;
021
022/**
023 * Line number table
024 */
025public class LineNumberTableAttribute extends BCIRenumberedAttribute {
026
027    private static CPUTF8 attributeName;
028
029    public static void setAttributeName(final CPUTF8 cpUTF8Value) {
030        attributeName = cpUTF8Value;
031    }
032
033    private final int lineNumberTableLength;
034    private final int[] startPcs;
035    private final int[] lineNumbers;
036
037    public LineNumberTableAttribute(final int lineNumberTableLength, final int[] startPcs,
038        final int[] lineNumbers) {
039        super(attributeName);
040        this.lineNumberTableLength = lineNumberTableLength;
041        this.startPcs = startPcs;
042        this.lineNumbers = lineNumbers;
043    }
044
045    @Override
046    public boolean equals(final Object obj) {
047        return this == obj;
048    }
049
050    @Override
051    protected int getLength() {
052        return 2 + 4 * lineNumberTableLength;
053    }
054
055    /*
056     * (non-Javadoc)
057     *
058     * @see org.apache.commons.compress.harmony.unpack200.bytecode.Attribute#getNestedClassFileEntries()
059     */
060    @Override
061    protected ClassFileEntry[] getNestedClassFileEntries() {
062        return new ClassFileEntry[] {getAttributeName()};
063    }
064
065    @Override
066    protected int[] getStartPCs() {
067        return startPcs;
068    }
069
070    /*
071     * (non-Javadoc)
072     *
073     * @see
074     * org.apache.commons.compress.harmony.unpack200.bytecode.Attribute#resolve(org.apache.commons.compress.harmony.
075     * unpack200.bytecode.ClassConstantPool)
076     */
077    @Override
078    protected void resolve(final ClassConstantPool pool) {
079        super.resolve(pool);
080    }
081
082    /*
083     * (non-Javadoc)
084     *
085     * @see org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry#toString()
086     */
087    @Override
088    public String toString() {
089        return "LineNumberTable: " + lineNumberTableLength + " lines";
090    }
091
092    @Override
093    protected void writeBody(final DataOutputStream dos) throws IOException {
094        dos.writeShort(lineNumberTableLength);
095        for (int i = 0; i < lineNumberTableLength; i++) {
096            dos.writeShort(startPcs[i]);
097            dos.writeShort(lineNumbers[i]);
098        }
099    }
100}