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1   /*
2    * Copyright  2000-2004 The Apache Software Foundation
3    *
4    *  Licensed under the Apache License, Version 2.0 (the "License"); 
5    *  you may not use this file except in compliance with the License.
6    *  You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *  Unless required by applicable law or agreed to in writing, software
11   *  distributed under the License is distributed on an "AS IS" BASIS,
12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *  See the License for the specific language governing permissions and
14   *  limitations under the License. 
15   *
16   */
17  package org.apache.bcel.generic;
18  
19  /*** 
20   * ARRAYLENGTH -  Get length of array
21   * <PRE>Stack: ..., arrayref -&gt; ..., length</PRE>
22   *
23   * @version $Id: ARRAYLENGTH.java 386056 2006-03-15 11:31:56Z tcurdt $
24   * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
25   */
26  public class ARRAYLENGTH extends Instruction implements ExceptionThrower, StackProducer {
27  
28      /*** Get length of array
29       */
30      public ARRAYLENGTH() {
31          super(org.apache.bcel.Constants.ARRAYLENGTH, (short) 1);
32      }
33  
34  
35      /*** @return exceptions this instruction may cause
36       */
37      public Class[] getExceptions() {
38          return new Class[] {
39              org.apache.bcel.ExceptionConstants.NULL_POINTER_EXCEPTION
40          };
41      }
42  
43  
44      /***
45       * Call corresponding visitor method(s). The order is:
46       * Call visitor methods of implemented interfaces first, then
47       * call methods according to the class hierarchy in descending order,
48       * i.e., the most specific visitXXX() call comes last.
49       *
50       * @param v Visitor object
51       */
52      public void accept( Visitor v ) {
53          v.visitExceptionThrower(this);
54          v.visitStackProducer(this);
55          v.visitARRAYLENGTH(this);
56      }
57  }