    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.CPString;
    023import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry;
    024import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
    025
    026/**
    027 * This class implements the byte code form for those bytecodes which have string references (and only string
    028 * references).
    029 */
    030public class StringRefForm extends SingleByteReferenceForm {
    031
    032    public StringRefForm(final int opcode, final String name, final int[] rewrite) {
    033        super(opcode, name, rewrite);
    034    }
    035
    036    public StringRefForm(final int opcode, final String name, final int[] rewrite, final boolean widened) {
    037        this(opcode, name, rewrite);
    038        this.widened = widened;
    039    }
    040
    041    @Override
    042    protected int getOffset(final OperandManager operandManager) {
    043        return operandManager.nextStringRef();
    044    }
    045
    046    @Override
    047    protected int getPoolID() {
    048        return SegmentConstantPool.CP_STRING;
    049    }
    050
    051    @Override
    052    protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset)
    053        throws Pack200Exception {
    054        final SegmentConstantPool globalPool = operandManager.globalConstantPool();
    055        ClassFileEntry[] nested = null;
    056        nested = new ClassFileEntry[] {((CPString) globalPool.getValue(getPoolID(), offset))};
    057        byteCode.setNested(nested);
    058        if (widened) {
    059            byteCode.setNestedPositions(new int[][] {{0, 2}});
    060        } else {
    061            byteCode.setNestedPositions(new int[][] {{0, 1}});
    062        }
    063    }
    064}