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


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 import java.io.DataOutputStream JavaDoc;
20 import java.io.IOException JavaDoc;
21 import org.apache.bcel.util.ByteSequence;
22
23 /**
24  * JSR_W - Jump to subroutine
25  *
26  * @version $Id: JSR_W.java 386056 2006-03-15 11:31:56Z tcurdt $
27  * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
28  */
29 public class JSR_W extends JsrInstruction {
30
31     /**
32      * Empty constructor needed for the Class.newInstance() statement in
33      * Instruction.readInstruction(). Not to be used otherwise.
34      */
35     JSR_W() {
36     }
37
38
39     public JSR_W(InstructionHandle target) {
40         super(org.apache.bcel.Constants.JSR_W, target);
41         length = 5;
42     }
43
44
45     /**
46      * Dump instruction as byte code to stream out.
47      * @param out Output stream
48      */
49     public void dump( DataOutputStream JavaDoc out ) throws IOException JavaDoc {
50         index = getTargetOffset();
51         out.writeByte(opcode);
52         out.writeInt(index);
53     }
54
55
56     /**
57      * Read needed data (e.g. index) from file.
58      */
59     protected void initFromFile( ByteSequence bytes, boolean wide ) throws IOException JavaDoc {
60         index = bytes.readInt();
61         length = 5;
62     }
63
64
65     /**
66      * Call corresponding visitor method(s). The order is:
67      * Call visitor methods of implemented interfaces first, then
68      * call methods according to the class hierarchy in descending order,
69      * i.e., the most specific visitXXX() call comes last.
70      *
71      * @param v Visitor object
72      */
73     public void accept( Visitor v ) {
74         v.visitStackProducer(this);
75         v.visitBranchInstruction(this);
76         v.visitJsrInstruction(this);
77         v.visitJSR_W(this);
78     }
79 }
80
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