1 | /* |
2 | * Copyright (c) 2001-2009, Jean Tessier |
3 | * All rights reserved. |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
8 | * |
9 | * * Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * |
12 | * * Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * |
16 | * * Neither the name of Jean Tessier nor the names of his contributors |
17 | * may be used to endorse or promote products derived from this software |
18 | * without specific prior written permission. |
19 | * |
20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR |
24 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
26 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
27 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
28 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
29 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
30 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
31 | */ |
32 | |
33 | package com.jeantessier.classreader.impl; |
34 | |
35 | import java.io.*; |
36 | |
37 | import org.apache.log4j.*; |
38 | |
39 | import com.jeantessier.classreader.*; |
40 | |
41 | public class BooleanConstantElementValue extends ConstantElementValue implements com.jeantessier.classreader.BooleanConstantElementValue { |
42 | public BooleanConstantElementValue(ConstantPool constantPool, DataInput in) throws IOException { |
43 | super(constantPool, in); |
44 | Logger.getLogger(getClass()).debug("Const value index: " + getConstValueIndex() + " (" + getConstValue() + ")"); |
45 | } |
46 | |
47 | /** |
48 | * The Classfile Format Spec does not tell how to map a CONSTANT_Integer |
49 | * structure to a boolean value. This method assumes that 0 is false and |
50 | * anything else is true, like in C. Another possibility would be that |
51 | * the presence of a CONSTANT_Integer is true and its absence is false, but |
52 | * that is not the current implementation. |
53 | * |
54 | * @return false if the matching constant pool entry has value 0, true otherwise. |
55 | */ |
56 | public boolean getConstValue() { |
57 | return ((Integer_info) getRawConstValue()).getValue() != 0; |
58 | } |
59 | |
60 | public char getTag() { |
61 | return ElementValueType.BOOLEAN.getTag(); |
62 | } |
63 | |
64 | public void accept(Visitor visitor) { |
65 | visitor.visitBooleanConstantElementValue(this); |
66 | } |
67 | } |