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 -> ..., 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}