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 * Constant pool entry for a class
024 */
025public class CPClass extends ConstantPoolEntry {
026
027    private int index;
028
029    public String name;
030
031    private final CPUTF8 utf8;
032
033    /**
034     * Creates a new CPClass
035     *
036     * @param name TODO
037     * @param globalIndex index in CpBands
038     * @throws NullPointerException if name is null
039     */
040    public CPClass(final CPUTF8 name, final int globalIndex) {
041        super(ConstantPoolEntry.CP_Class, globalIndex);
042        if (name == null) {
043            throw new NullPointerException("Null arguments are not allowed");
044        }
045        this.name = name.underlyingString();
046        this.utf8 = name;
047    }
048
049    @Override
050    public boolean equals(final Object obj) {
051        if (this == obj) {
052            return true;
053        }
054        if (obj == null) {
055            return false;
056        }
057        if (this.getClass() != obj.getClass()) {
058            return false;
059        }
060        final CPClass other = (CPClass) obj;
061        return utf8.equals(other.utf8);
062    }
063
064    @Override
065    protected ClassFileEntry[] getNestedClassFileEntries() {
066        return new ClassFileEntry[] {utf8,};
067    }
068
069    private boolean hashcodeComputed;
070    private int cachedHashCode;
071
072    private void generateHashCode() {
073        hashcodeComputed = true;
074        cachedHashCode = utf8.hashCode();
075    }
076
077    @Override
078    public int hashCode() {
079        if (!hashcodeComputed) {
080            generateHashCode();
081        }
082        return cachedHashCode;
083    }
084
085    @Override
086    protected void resolve(final ClassConstantPool pool) {
087        super.resolve(pool);
088        index = pool.indexOf(utf8);
089    }
090
091    @Override
092    public String toString() {
093        return "Class: " + getName();
094    }
095
096    public String getName() {
097        return name;
098    }
099
100    @Override
101    protected void writeBody(final DataOutputStream dos) throws IOException {
102        dos.writeShort(index);
103    }
104}