LineNumberTableAttribute.java

/*
 * 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
 *
 *   https://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.commons.compress.harmony.unpack200.bytecode;

import java.io.DataOutputStream;
import java.io.IOException;

/**
 * Line number table
 */
public class LineNumberTableAttribute extends BCIRenumberedAttribute {

    private static CPUTF8 attributeName;

    public static void setAttributeName(final CPUTF8 cpUTF8Value) {
        attributeName = cpUTF8Value;
    }

    private final int lineNumberTableLength;
    private final int[] startPcs;
    private final int[] lineNumbers;

    public LineNumberTableAttribute(final int lineNumberTableLength, final int[] startPcs, final int[] lineNumbers) {
        super(attributeName);
        this.lineNumberTableLength = lineNumberTableLength;
        this.startPcs = startPcs;
        this.lineNumbers = lineNumbers;
    }

    @Override
    public boolean equals(final Object obj) {
        return this == obj;
    }

    @Override
    protected int getLength() {
        return 2 + 4 * lineNumberTableLength;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.apache.commons.compress.harmony.unpack200.bytecode.Attribute#getNestedClassFileEntries()
     */
    @Override
    protected ClassFileEntry[] getNestedClassFileEntries() {
        return new ClassFileEntry[] { getAttributeName() };
    }

    @Override
    protected int[] getStartPCs() {
        return startPcs;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry#toString()
     */
    @Override
    public String toString() {
        return "LineNumberTable: " + lineNumberTableLength + " lines";
    }

    @Override
    protected void writeBody(final DataOutputStream dos) throws IOException {
        dos.writeShort(lineNumberTableLength);
        for (int i = 0; i < lineNumberTableLength; i++) {
            dos.writeShort(startPcs[i]);
            dos.writeShort(lineNumbers[i]);
        }
    }
}