    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
    025 * abstract superclass of those classes.
    026 */
    027public abstract class SingleByteReferenceForm extends ReferenceForm {
    028
    029    protected boolean widened;
    030
    031    public SingleByteReferenceForm(final int opcode, final String name, final int[] rewrite) {
    032        super(opcode, name, rewrite);
    033    }
    034
    035    @Override
    036    protected abstract int getOffset(OperandManager operandManager);
    037
    038    @Override
    039    protected abstract int getPoolID();
    040
    041    @Override
    042    public boolean nestedMustStartClassPool() {
    043        return !widened;
    044    }
    045
    046    @Override
    047    protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset)
    048        throws Pack200Exception {
    049        super.setNestedEntries(byteCode, operandManager, offset);
    050        if (widened) {
    051            byteCode.setNestedPositions(new int[][] {{0, 2}});
    052        } else {
    053            byteCode.setNestedPositions(new int[][] {{0, 1}});
    054        }
    055    }
    056}