    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;
    023import java.util.Objects;
    024
    025/**
    026 * Constant pool entry for a class
    027 */
    028public class CPClass extends ConstantPoolEntry {
    029
    030    private int index;
    031
    032    public String name;
    033
    034    private final CPUTF8 utf8;
    035
    036    private boolean hashCodeComputed;
    037
    038    private int cachedHashCode;
    039
    040    /**
    041     * Creates a new CPClass
    042     *
    043     * @param name        TODO
    044     * @param globalIndex index in CpBands
    045     * @throws NullPointerException if name is null
    046     */
    047    public CPClass(final CPUTF8 name, final int globalIndex) {
    048        super(CP_Class, globalIndex);
    049        this.name = Objects.requireNonNull(name, "name").underlyingString();
    050        this.utf8 = name;
    051    }
    052
    053    @Override
    054    public boolean equals(final Object obj) {
    055        if (this == obj) {
    056            return true;
    057        }
    058        if (obj == null || this.getClass() != obj.getClass()) {
    059            return false;
    060        }
    061        final CPClass other = (CPClass) obj;
    062        return utf8.equals(other.utf8);
    063    }
    064
    065    private void generateHashCode() {
    066        hashCodeComputed = true;
    067        cachedHashCode = utf8.hashCode();
    068    }
    069
    070    public String getName() {
    071        return name;
    072    }
    073
    074    @Override
    075    protected ClassFileEntry[] getNestedClassFileEntries() {
    076        return new ClassFileEntry[] { utf8, };
    077    }
    078
    079    @Override
    080    public int hashCode() {
    081        if (!hashCodeComputed) {
    082            generateHashCode();
    083        }
    084        return cachedHashCode;
    085    }
    086
    087    @Override
    088    protected void resolve(final ClassConstantPool pool) {
    089        super.resolve(pool);
    090        index = pool.indexOf(utf8);
    091    }
    092
    093    @Override
    094    public String toString() {
    095        return "Class: " + getName();
    096    }
    097
    098    @Override
    099    protected void writeBody(final DataOutputStream dos) throws IOException {
    100        dos.writeShort(index);
    101    }
    102}