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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   * MONITORENTER - Enter monitor for object
23   *
24   * <PRE>
25   * Stack: ..., objectref -&gt; ...
26   * </PRE>
27   */
28  public class MONITORENTER extends Instruction implements ExceptionThrower, StackConsumer {
29  
30      public MONITORENTER() {
31          super(org.apache.bcel.Const.MONITORENTER, (short) 1);
32      }
33  
34      /**
35       * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
36       * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
37       *
38       * @param v Visitor object
39       */
40      @Override
41      public void accept(final Visitor v) {
42          v.visitExceptionThrower(this);
43          v.visitStackConsumer(this);
44          v.visitMONITORENTER(this);
45      }
46  
47      @Override
48      public Class<?>[] getExceptions() {
49          return new Class[] {ExceptionConst.NULL_POINTER_EXCEPTION};
50      }
51  }