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