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