    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     * Constructs an ArrayInstruction.
    036     *
    037     * @param opcode of instruction.
    038     */
    039    protected ArrayInstruction(final short opcode) {
    040        super(opcode, (short) 1);
    041    }
    042
    043    @Override
    044    public Class<?>[] getExceptions() {
    045        return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_ARRAY_EXCEPTION);
    046    }
    047
    048    /**
    049     * @return type associated with the instruction.
    050     */
    051    @Override
    052    public Type getType(final ConstantPoolGen cp) {
    053        final short opcode = super.getOpcode();
    054        switch (opcode) {
    055        case org.apache.bcel.Const.IALOAD:
    056        case org.apache.bcel.Const.IASTORE:
    057            return Type.INT;
    058        case org.apache.bcel.Const.CALOAD:
    059        case org.apache.bcel.Const.CASTORE:
    060            return Type.CHAR;
    061        case org.apache.bcel.Const.BALOAD:
    062        case org.apache.bcel.Const.BASTORE:
    063            return Type.BYTE;
    064        case org.apache.bcel.Const.SALOAD:
    065        case org.apache.bcel.Const.SASTORE:
    066            return Type.SHORT;
    067        case org.apache.bcel.Const.LALOAD:
    068        case org.apache.bcel.Const.LASTORE:
    069            return Type.LONG;
    070        case org.apache.bcel.Const.DALOAD:
    071        case org.apache.bcel.Const.DASTORE:
    072            return Type.DOUBLE;
    073        case org.apache.bcel.Const.FALOAD:
    074        case org.apache.bcel.Const.FASTORE:
    075            return Type.FLOAT;
    076        case org.apache.bcel.Const.AALOAD:
    077        case org.apache.bcel.Const.AASTORE:
    078            return Type.OBJECT;
    079        default:
    080            throw new ClassGenException("Unknown case in switch" + opcode);
    081        }
    082    }
    083}