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.bytecode.ByteCode;
021import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
022
023/**
024 * Some bytecodes (such as (a)ldc, fldc and ildc) have single-byte references to the class pool. This class is the abstract superclass of those classes.
025 */
026public abstract class SingleByteReferenceForm extends ReferenceForm {
027
028    protected boolean widened;
029
030    public SingleByteReferenceForm(final int opcode, final String name, final int[] rewrite) {
031        super(opcode, name, rewrite);
032    }
033
034    @Override
035    protected abstract int getOffset(OperandManager operandManager);
036
037    @Override
038    protected abstract int getPoolID();
039
040    @Override
041    public boolean nestedMustStartClassPool() {
042        return !widened;
043    }
044
045    @Override
046    protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception {
047        super.setNestedEntries(byteCode, operandManager, offset);
048        if (widened) {
049            byteCode.setNestedPositions(new int[][] { { 0, 2 } });
050        } else {
051            byteCode.setNestedPositions(new int[][] { { 0, 1 } });
052        }
053    }
054}