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 * ARRAYLENGTH - Get length of array
025 *
026 * <PRE>
027 * Stack: ..., arrayref -&gt; ..., length
028 * </PRE>
029 */
030public class ARRAYLENGTH extends Instruction implements ExceptionThrower, StackProducer, StackConsumer /* since 6.0 */ {
031
032    /**
033     * Gets length of array
034     */
035    public ARRAYLENGTH() {
036        super(org.apache.bcel.Const.ARRAYLENGTH, (short) 1);
037    }
038
039    /**
040     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
041     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
042     *
043     * @param v Visitor object
044     */
045    @Override
046    public void accept(final Visitor v) {
047        v.visitExceptionThrower(this);
048        v.visitStackProducer(this);
049        v.visitARRAYLENGTH(this);
050    }
051
052    /**
053     * @return exceptions this instruction may cause
054     */
055    @Override
056    public Class<?>[] getExceptions() {
057        return new Class[] {ExceptionConst.NULL_POINTER_EXCEPTION};
058    }
059}