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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;
20  import java.io.IOException;
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 out ) throws IOException {
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 {
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  }