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