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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   */
18  package org.apache.bcel.generic;
19  
20  import java.io.DataOutputStream;
21  import java.io.IOException;
22  
23  import org.apache.bcel.util.ByteSequence;
24  
25  /**
26   * GOTO_W - Branch always (to relative offset, not absolute address)
27   *
28   */
29  public class GOTO_W extends GotoInstruction {
30  
31      /**
32       * Empty constructor needed for Instruction.readInstruction.
33       * Not to be used otherwise.
34       */
35      GOTO_W() {
36      }
37  
38  
39      public GOTO_W(final InstructionHandle target) {
40          super(org.apache.bcel.Const.GOTO_W, target);
41          super.setLength(5);
42      }
43  
44  
45      /**
46       * Dump instruction as byte code to stream out.
47       * @param out Output stream
48       */
49      @Override
50      public void dump( final DataOutputStream out ) throws IOException {
51          super.setIndex(getTargetOffset());
52          out.writeByte(super.getOpcode());
53          out.writeInt(super.getIndex());
54      }
55  
56  
57      /**
58       * Read needed data (e.g. index) from file.
59       */
60      @Override
61      protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
62          super.setIndex(bytes.readInt());
63          super.setLength(5);
64      }
65  
66  
67      /**
68       * Call corresponding visitor method(s). The order is:
69       * Call visitor methods of implemented interfaces first, then
70       * call methods according to the class hierarchy in descending order,
71       * i.e., the most specific visitXXX() call comes last.
72       *
73       * @param v Visitor object
74       */
75      @Override
76      public void accept( final Visitor v ) {
77          v.visitUnconditionalBranch(this);
78          v.visitBranchInstruction(this);
79          v.visitGotoInstruction(this);
80          v.visitGOTO_W(this);
81      }
82  }