    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.forms;
    018
    019import org.apache.commons.compress.harmony.pack200.Pack200Exception;
    020import org.apache.commons.compress.harmony.unpack200.SegmentConstantPool;
    021import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode;
    022import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry;
    023import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
    024
    025/**
    026 * This class implements the byte code form for those bytecodes which have string references (and only string references).
    027 */
    028public class StringRefForm extends SingleByteReferenceForm {
    029
    030    public StringRefForm(final int opcode, final String name, final int[] rewrite) {
    031        super(opcode, name, rewrite);
    032    }
    033
    034    public StringRefForm(final int opcode, final String name, final int[] rewrite, final boolean widened) {
    035        this(opcode, name, rewrite);
    036        this.widened = widened;
    037    }
    038
    039    @Override
    040    protected int getOffset(final OperandManager operandManager) {
    041        return operandManager.nextStringRef();
    042    }
    043
    044    @Override
    045    protected int getPoolID() {
    046        return SegmentConstantPool.CP_STRING;
    047    }
    048
    049    @Override
    050    protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception {
    051        final SegmentConstantPool globalPool = operandManager.globalConstantPool();
    052        final ClassFileEntry[] nested = { globalPool.getValue(getPoolID(), offset) };
    053        byteCode.setNested(nested);
    054        if (widened) {
    055            byteCode.setNestedPositions(new int[][] { { 0, 2 } });
    056        } else {
    057            byteCode.setNestedPositions(new int[][] { { 0, 1 } });
    058        }
    059    }
    060}