    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 * String constant pool entry.
    024 */
    025public class CPString extends CPConstant {
    026
    027    private transient int nameIndex;
    028    private final CPUTF8 name;
    029
    030    public CPString(final CPUTF8 value, final int globalIndex) {
    031        super(ConstantPoolEntry.CP_String, value, globalIndex);
    032        this.name = value;
    033    }
    034
    035    @Override
    036    protected void writeBody(final DataOutputStream dos) throws IOException {
    037        dos.writeShort(nameIndex);
    038    }
    039
    040    @Override
    041    public String toString() {
    042        return "String: " + getValue();
    043    }
    044
    045    /**
    046     * Allows the constant pool entries to resolve their nested entries
    047     *
    048     * @param pool TODO
    049     */
    050    @Override
    051    protected void resolve(final ClassConstantPool pool) {
    052        super.resolve(pool);
    053        nameIndex = pool.indexOf(name);
    054    }
    055
    056    @Override
    057    protected ClassFileEntry[] getNestedClassFileEntries() {
    058        return new ClassFileEntry[] {name};
    059    }
    060
    061    private boolean hashcodeComputed;
    062    private int cachedHashCode;
    063
    064    private void generateHashCode() {
    065        hashcodeComputed = true;
    066        final int PRIME = 31;
    067        int result = 1;
    068        result = PRIME * result + name.hashCode();
    069        cachedHashCode = result;
    070    }
    071
    072    @Override
    073    public int hashCode() {
    074        if (!hashcodeComputed) {
    075            generateHashCode();
    076        }
    077        return cachedHashCode;
    078    }
    079}