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