001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.commons.compress.harmony.unpack200.bytecode.forms;
020
021import org.apache.commons.compress.harmony.pack200.Pack200Exception;
022import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode;
023import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
024
025/**
026 * This class is used for representations of cldc and cldc_w. In these cases, a narrow class ref has one byte and a wide class ref has two bytes.
027 */
028public class NarrowClassRefForm extends ClassRefForm {
029
030    /**
031     * Constructs a new instance with the specified opcode, name, operandType and rewrite.
032     *
033     * @param opcode  index corresponding to the opcode's value.
034     * @param name    String printable name of the opcode.
035     * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
036     */
037    public NarrowClassRefForm(final int opcode, final String name, final int[] rewrite) {
038        super(opcode, name, rewrite);
039    }
040
041    /**
042     * Constructs a new instance with the specified opcode, name, operandType and rewrite.
043     *
044     * @param opcode  index corresponding to the opcode's value.
045     * @param name    String printable name of the opcode.
046     * @param rewrite Operand positions (which will later be rewritten in ByteCodes) are indicated by -1.
047     * @param widened TODO.
048     */
049    public NarrowClassRefForm(final int opcode, final String name, final int[] rewrite, final boolean widened) {
050        super(opcode, name, rewrite, widened);
051    }
052
053    @Override
054    public boolean nestedMustStartClassPool() {
055        return !widened;
056    }
057
058    @Override
059    protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset) throws Pack200Exception {
060        super.setNestedEntries(byteCode, operandManager, offset);
061        if (!widened) {
062            byteCode.setNestedPositions(new int[][] { { 0, 1 } });
063        }
064    }
065}