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 *
017 */
018package org.apache.bcel.generic;
019
020import org.apache.bcel.ExceptionConst;
021
022/**
023 * Super class for instructions dealing with array access such as IALOAD.
024 *
025 * @version $Id: ArrayInstruction.java 1747278 2016-06-07 17:28:43Z britter $
026 */
027public abstract class ArrayInstruction extends Instruction implements ExceptionThrower,
028        TypedInstruction {
029
030    /**
031     * Empty constructor needed for the Class.newInstance() statement in
032     * Instruction.readInstruction(). Not to be used otherwise.
033     */
034    ArrayInstruction() {
035    }
036
037
038    /**
039     * @param opcode of instruction
040     */
041    protected ArrayInstruction(final short opcode) {
042        super(opcode, (short) 1);
043    }
044
045
046    @Override
047    public Class<?>[] getExceptions() {
048        return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_ARRAY_EXCEPTION);
049    }
050
051
052    /** @return type associated with the instruction
053     */
054    @Override
055    public Type getType( final ConstantPoolGen cp ) {
056        final short _opcode = super.getOpcode();
057        switch (_opcode) {
058            case org.apache.bcel.Const.IALOAD:
059            case org.apache.bcel.Const.IASTORE:
060                return Type.INT;
061            case org.apache.bcel.Const.CALOAD:
062            case org.apache.bcel.Const.CASTORE:
063                return Type.CHAR;
064            case org.apache.bcel.Const.BALOAD:
065            case org.apache.bcel.Const.BASTORE:
066                return Type.BYTE;
067            case org.apache.bcel.Const.SALOAD:
068            case org.apache.bcel.Const.SASTORE:
069                return Type.SHORT;
070            case org.apache.bcel.Const.LALOAD:
071            case org.apache.bcel.Const.LASTORE:
072                return Type.LONG;
073            case org.apache.bcel.Const.DALOAD:
074            case org.apache.bcel.Const.DASTORE:
075                return Type.DOUBLE;
076            case org.apache.bcel.Const.FALOAD:
077            case org.apache.bcel.Const.FASTORE:
078                return Type.FLOAT;
079            case org.apache.bcel.Const.AALOAD:
080            case org.apache.bcel.Const.AASTORE:
081                return Type.OBJECT;
082            default:
083                throw new ClassGenException("Oops: unknown case in switch" + _opcode);
084        }
085    }
086}