    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.forms;
    020
    021import org.apache.commons.compress.harmony.pack200.Pack200Exception;
    022import org.apache.commons.compress.harmony.unpack200.SegmentConstantPool;
    023import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode;
    024import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry;
    025import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
    026
    027/**
    028 * This class implements the byte code form for those bytecodes which have string references (and only string references).
    029 */
    030public class StringRefForm extends SingleByteReferenceForm {
    031
    032    /**
    033     * Constructs a new instance with the specified opcode, name, operandType and rewrite.
    034     *
    035     * @param opcode  index corresponding to the opcode's value.
    036     * @param name    String printable name of the opcode.
    037     * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
    038     */
    039    public StringRefForm(final int opcode, final String name, final int[] rewrite) {
    040        super(opcode, name, rewrite);
    041    }
    042
    043    /**
    044     * Constructs a new instance with the specified opcode, name, operandType and rewrite.
    045     *
    046     * @param opcode  index corresponding to the opcode's value.
    047     * @param name    String printable name of the opcode.
    048     * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
    049     * @param widened TODO.
    050     */
    051    public StringRefForm(final int opcode, final String name, final int[] rewrite, final boolean widened) {
    052        this(opcode, name, rewrite);
    053        this.widened = widened;
    054    }
    055
    056    @Override
    057    protected int getOffset(final OperandManager operandManager) {
    058        return operandManager.nextStringRef();
    059    }
    060
    061    @Override
    062    protected int getPoolID() {
    063        return SegmentConstantPool.CP_STRING;
    064    }
    065
    066    @Override
    067    protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception {
    068        final SegmentConstantPool globalPool = operandManager.globalConstantPool();
    069        final ClassFileEntry[] nested = { globalPool.getValue(getPoolID(), offset) };
    070        byteCode.setNested(nested);
    071        if (widened) {
    072            byteCode.setNestedPositions(new int[][] { { 0, 2 } });
    073        } else {
    074            byteCode.setNestedPositions(new int[][] { { 0, 1 } });
    075        }
    076    }
    077}