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  * @version $Id$
25  */
26 public class ACONST_NULL extends Instruction implements PushInstruction, TypedInstruction {
27 
28     /**
29      * Push null reference
30      */
ACONST_NULL()31     public ACONST_NULL() {
32         super(org.apache.bcel.Const.ACONST_NULL, (short) 1);
33     }
34 
35 
36     /** @return Type.NULL
37      */
38     @Override
getType( final ConstantPoolGen cp )39     public Type getType( final ConstantPoolGen cp ) {
40         return Type.NULL;
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     @Override
accept( final Visitor v )53     public void accept( final Visitor v ) {
54         v.visitStackProducer(this);
55         v.visitPushInstruction(this);
56         v.visitTypedInstruction(this);
57         v.visitACONST_NULL(this);
58     }
59 }
60