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