    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
    027 * references).
    028 */
    029public class StringRefForm extends SingleByteReferenceForm {
    030
    031    public StringRefForm(final int opcode, final String name, final int[] rewrite) {
    032        super(opcode, name, rewrite);
    033    }
    034
    035    public StringRefForm(final int opcode, final String name, final int[] rewrite, final boolean widened) {
    036        this(opcode, name, rewrite);
    037        this.widened = widened;
    038    }
    039
    040    @Override
    041    protected int getOffset(final OperandManager operandManager) {
    042        return operandManager.nextStringRef();
    043    }
    044
    045    @Override
    046    protected int getPoolID() {
    047        return SegmentConstantPool.CP_STRING;
    048    }
    049
    050    @Override
    051    protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset)
    052        throws Pack200Exception {
    053        final SegmentConstantPool globalPool = operandManager.globalConstantPool();
    054        ClassFileEntry[] nested = new ClassFileEntry[] {globalPool.getValue(getPoolID(), offset)};
    055        byteCode.setNested(nested);
    056        if (widened) {
    057            byteCode.setNestedPositions(new int[][] {{0, 2}});
    058        } else {
    059            byteCode.setNestedPositions(new int[][] {{0, 1}});
    060        }
    061    }
    062}