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Java > Open Source Codes > org > apache > bcel > generic > IFNONNULL


1 /*
2  * Copyright 2000-2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 package org.apache.bcel.generic;
18
19 /**
20  * IFNONNULL - Branch if reference is not null
21  *
22  * <PRE>Stack: ..., reference -&gt; ...</PRE>
23  *
24  * @version $Id: IFNONNULL.java 386056 2006-03-15 11:31:56Z tcurdt $
25  * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
26  */
27 public class IFNONNULL extends IfInstruction {
28
29     /**
30      * Empty constructor needed for the Class.newInstance() statement in
31      * Instruction.readInstruction(). Not to be used otherwise.
32      */
33     IFNONNULL() {
34     }
35
36
37     public IFNONNULL(InstructionHandle target) {
38         super(org.apache.bcel.Constants.IFNONNULL, target);
39     }
40
41
42     /**
43      * @return negation of instruction
44      */
45     public IfInstruction negate() {
46         return new IFNULL(target);
47     }
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
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