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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   * IFNONNULL - Branch if reference is not null
21   *
22   * <PRE>
23   * Stack: ..., reference -&gt; ...
24   * </PRE>
25   */
26  public class IFNONNULL extends IfInstruction {
27  
28      /**
29       * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
30       */
31      IFNONNULL() {
32      }
33  
34      public IFNONNULL(final InstructionHandle target) {
35          super(org.apache.bcel.Const.IFNONNULL, target);
36      }
37  
38      /**
39       * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
40       * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
41       *
42       * @param v Visitor object
43       */
44      @Override
45      public void accept(final Visitor v) {
46          v.visitStackConsumer(this);
47          v.visitBranchInstruction(this);
48          v.visitIfInstruction(this);
49          v.visitIFNONNULL(this);
50      }
51  
52      /**
53       * @return negation of instruction
54       */
55      @Override
56      public IfInstruction negate() {
57          return new IFNULL(super.getTarget());
58      }
59  }