    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.bcel.generic;
    020
    021import org.apache.bcel.ExceptionConst;
    022
    023/**
    024 * Super class for instructions dealing with array access such as IALOAD.
    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}