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