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 * Enclosing method class file attribute.
024 */
025public class EnclosingMethodAttribute extends Attribute {
026
027    private int class_index;
028    private int method_index;
029    private final CPClass cpClass;
030    private final CPNameAndType method;
031    private static CPUTF8 attributeName;
032
033    public static void setAttributeName(final CPUTF8 cpUTF8Value) {
034        attributeName = cpUTF8Value;
035    }
036
037    public EnclosingMethodAttribute(final CPClass cpClass, final CPNameAndType method) {
038        super(attributeName);
039        this.cpClass = cpClass;
040        this.method = method;
041    }
042
043    @Override
044    protected ClassFileEntry[] getNestedClassFileEntries() {
045        if (method != null) {
046            return new ClassFileEntry[] {attributeName, cpClass, method};
047        }
048        return new ClassFileEntry[] {attributeName, cpClass};
049    }
050
051    /*
052     * (non-Javadoc)
053     *
054     * @see org.apache.commons.compress.harmony.unpack200.bytecode.Attribute#getLength()
055     */
056    @Override
057    protected int getLength() {
058        return 4;
059    }
060
061    @Override
062    protected void resolve(final ClassConstantPool pool) {
063        super.resolve(pool);
064        cpClass.resolve(pool);
065        class_index = pool.indexOf(cpClass);
066        if (method != null) {
067            method.resolve(pool);
068            method_index = pool.indexOf(method);
069        } else {
070            method_index = 0;
071        }
072    }
073
074    /*
075     * (non-Javadoc)
076     *
077     * @see org.apache.commons.compress.harmony.unpack200.bytecode.Attribute#writeBody(java.io.DataOutputStream)
078     */
079    @Override
080    protected void writeBody(final DataOutputStream dos) throws IOException {
081        dos.writeShort(class_index);
082        dos.writeShort(method_index);
083    }
084
085    /*
086     * (non-Javadoc)
087     *
088     * @see org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry#toString()
089     */
090    @Override
091    public String toString() {
092        return "EnclosingMethod";
093    }
094
095}