001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.commons.compress.harmony.unpack200.bytecode;
020
021import java.io.DataOutputStream;
022import java.io.IOException;
023
024/**
025 * Enclosing method class file attribute.
026 */
027public class EnclosingMethodAttribute extends Attribute {
028
029    private static CPUTF8 attributeName;
030
031    public static void setAttributeName(final CPUTF8 cpUTF8Value) {
032        attributeName = cpUTF8Value;
033    }
034
035    private int classIndex;
036    private int methodIndex;
037    private final CPClass cpClass;
038
039    private final CPNameAndType method;
040
041    /**
042     * Constructs a new instance.
043     *
044     * @param cpClass a constant pool class.
045     * @param method a constant pool name and type.
046     */
047    public EnclosingMethodAttribute(final CPClass cpClass, final CPNameAndType method) {
048        super(attributeName);
049        this.cpClass = cpClass;
050        this.method = method;
051    }
052
053    /*
054     * (non-Javadoc)
055     *
056     * @see org.apache.commons.compress.harmony.unpack200.bytecode.Attribute#getLength()
057     */
058    @Override
059    protected int getLength() {
060        return 4;
061    }
062
063    @Override
064    protected ClassFileEntry[] getNestedClassFileEntries() {
065        if (method != null) {
066            return new ClassFileEntry[] { attributeName, cpClass, method };
067        }
068        return new ClassFileEntry[] { attributeName, cpClass };
069    }
070
071    @Override
072    protected void resolve(final ClassConstantPool pool) {
073        super.resolve(pool);
074        cpClass.resolve(pool);
075        classIndex = pool.indexOf(cpClass);
076        if (method != null) {
077            method.resolve(pool);
078            methodIndex = pool.indexOf(method);
079        } else {
080            methodIndex = 0;
081        }
082    }
083
084    /*
085     * (non-Javadoc)
086     *
087     * @see org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry#toString()
088     */
089    @Override
090    public String toString() {
091        return "EnclosingMethod";
092    }
093
094    /*
095     * (non-Javadoc)
096     *
097     * @see org.apache.commons.compress.harmony.unpack200.bytecode.Attribute#writeBody(java.io.DataOutputStream)
098     */
099    @Override
100    protected void writeBody(final DataOutputStream dos) throws IOException {
101        dos.writeShort(classIndex);
102        dos.writeShort(methodIndex);
103    }
104
105}