1/*
2 * reserved comment block
3 * DO NOT REMOVE OR ALTER!
4 */
5/*
6 * Licensed to the Apache Software Foundation (ASF) under one or more
7 * contributor license agreements.  See the NOTICE file distributed with
8 * this work for additional information regarding copyright ownership.
9 * The ASF licenses this file to You under the Apache License, Version 2.0
10 * (the "License"); you may not use this file except in compliance with
11 * the License.  You may obtain a copy of the License at
12 *
13 *      http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21
22package com.sun.org.apache.bcel.internal.generic;
23
24
25/**
26 * IFNONNULL - Branch if reference is not null
27 *
28 * <PRE>Stack: ..., reference -&gt; ...</PRE>
29 *
30 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
31 */
32public class IFNONNULL extends IfInstruction {
33  /**
34   * Empty constructor needed for the Class.newInstance() statement in
35   * Instruction.readInstruction(). Not to be used otherwise.
36   */
37  IFNONNULL() {}
38
39  public IFNONNULL(InstructionHandle target) {
40    super(com.sun.org.apache.bcel.internal.Constants.IFNONNULL, target);
41  }
42
43  /**
44   * @return negation of instruction
45   */
46  public IfInstruction negate() {
47    return new IFNULL(target);
48  }
49
50  /**
51   * Call corresponding visitor method(s). The order is:
52   * Call visitor methods of implemented interfaces first, then
53   * call methods according to the class hierarchy in descending order,
54   * i.e., the most specific visitXXX() call comes last.
55   *
56   * @param v Visitor object
57   */
58  public void accept(Visitor v) {
59    v.visitStackConsumer(this);
60    v.visitBranchInstruction(this);
61    v.visitIfInstruction(this);
62    v.visitIFNONNULL(this);
63  }
64}
65