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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   */
18  package org.apache.bcel.generic;
19  
20  /**
21   * ACONST_NULL - Push null reference
22   * <PRE>Stack: ... -&gt; ..., null</PRE>
23   *
24   */
25  public class ACONST_NULL extends Instruction implements PushInstruction, TypedInstruction {
26  
27      /**
28       * Push null reference
29       */
30      public ACONST_NULL() {
31          super(org.apache.bcel.Const.ACONST_NULL, (short) 1);
32      }
33  
34  
35      /** @return Type.NULL
36       */
37      @Override
38      public Type getType( final ConstantPoolGen cp ) {
39          return Type.NULL;
40      }
41  
42  
43      /**
44       * Call corresponding visitor method(s). The order is:
45       * Call visitor methods of implemented interfaces first, then
46       * call methods according to the class hierarchy in descending order,
47       * i.e., the most specific visitXXX() call comes last.
48       *
49       * @param v Visitor object
50       */
51      @Override
52      public void accept( final Visitor v ) {
53          v.visitStackProducer(this);
54          v.visitPushInstruction(this);
55          v.visitTypedInstruction(this);
56          v.visitACONST_NULL(this);
57      }
58  }