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 * ARRAYLENGTH - Get length of array
023 *
024 * <PRE>
025 * Stack: ..., arrayref -&gt; ..., length
026 * </PRE>
027 */
028public class ARRAYLENGTH extends Instruction implements ExceptionThrower, StackProducer, StackConsumer /* since 6.0 */ {
029
030    /**
031     * Gets length of array
032     */
033    public ARRAYLENGTH() {
034        super(org.apache.bcel.Const.ARRAYLENGTH, (short) 1);
035    }
036
037    /**
038     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
039     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
040     *
041     * @param v Visitor object
042     */
043    @Override
044    public void accept(final Visitor v) {
045        v.visitExceptionThrower(this);
046        v.visitStackProducer(this);
047        v.visitARRAYLENGTH(this);
048    }
049
050    /**
051     * @return exceptions this instruction may cause
052     */
053    @Override
054    public Class<?>[] getExceptions() {
055        return new Class[] {ExceptionConst.NULL_POINTER_EXCEPTION};
056    }
057}