    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}