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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   */
17  package org.apache.bcel.generic;
18  
19  import org.apache.bcel.ExceptionConst;
20  
21  /**
22   * ARRAYLENGTH - Get length of array
23   *
24   * <PRE>
25   * Stack: ..., arrayref -&gt; ..., length
26   * </PRE>
27   */
28  public class ARRAYLENGTH extends Instruction implements ExceptionThrower, StackProducer, StackConsumer /* since 6.0 */ {
29  
30      /**
31       * Gets length of array
32       */
33      public ARRAYLENGTH() {
34          super(org.apache.bcel.Const.ARRAYLENGTH, (short) 1);
35      }
36  
37      /**
38       * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
39       * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
40       *
41       * @param v Visitor object
42       */
43      @Override
44      public void accept(final Visitor v) {
45          v.visitExceptionThrower(this);
46          v.visitStackProducer(this);
47          v.visitARRAYLENGTH(this);
48      }
49  
50      /**
51       * @return exceptions this instruction may cause
52       */
53      @Override
54      public Class<?>[] getExceptions() {
55          return new Class[] {ExceptionConst.NULL_POINTER_EXCEPTION};
56      }
57  }