1/***
2 * ASM: a very small and fast Java bytecode manipulation framework
3 * Copyright (c) 2000-2007 INRIA, France Telecom
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the copyright holders nor the names of its
15 *    contributors may be used to endorse or promote products derived from
16 *    this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28 * THE POSSIBILITY OF SUCH DAMAGE.
29 */
30package org.mockito.asm.tree.analysis;
31
32import org.mockito.asm.Type;
33
34/**
35 * A {@link Value} that is represented by its type in a seven types type system.
36 * This type system distinguishes the UNINITIALZED, INT, FLOAT, LONG, DOUBLE,
37 * REFERENCE and RETURNADDRESS types.
38 *
39 * @author Eric Bruneton
40 */
41public class BasicValue implements Value {
42
43    public static final Value UNINITIALIZED_VALUE = new BasicValue(null);
44
45    public static final Value INT_VALUE = new BasicValue(Type.INT_TYPE);
46
47    public static final Value FLOAT_VALUE = new BasicValue(Type.FLOAT_TYPE);
48
49    public static final Value LONG_VALUE = new BasicValue(Type.LONG_TYPE);
50
51    public static final Value DOUBLE_VALUE = new BasicValue(Type.DOUBLE_TYPE);
52
53    public static final Value REFERENCE_VALUE = new BasicValue(Type.getObjectType("java/lang/Object"));
54
55    public static final Value RETURNADDRESS_VALUE = new BasicValue(null);
56
57    private final Type type;
58
59    public BasicValue(final Type type) {
60        this.type = type;
61    }
62
63    public Type getType() {
64        return type;
65    }
66
67    public int getSize() {
68        return type == Type.LONG_TYPE || type == Type.DOUBLE_TYPE ? 2 : 1;
69    }
70
71    public boolean isReference() {
72        return type != null
73                && (type.getSort() == Type.OBJECT || type.getSort() == Type.ARRAY);
74    }
75
76    public boolean equals(final Object value) {
77        if (value == this) {
78            return true;
79        } else if (value instanceof BasicValue) {
80            if (type == null) {
81                return ((BasicValue) value).type == null;
82            } else {
83                return type.equals(((BasicValue) value).type);
84            }
85        } else {
86            return false;
87        }
88    }
89
90    public int hashCode() {
91        return type == null ? 0 : type.hashCode();
92    }
93
94    public String toString() {
95        if (this == UNINITIALIZED_VALUE) {
96            return ".";
97        } else if (this == RETURNADDRESS_VALUE) {
98            return "A";
99        } else if (this == REFERENCE_VALUE) {
100            return "R";
101        } else {
102            return type.getDescriptor();
103        }
104    }
105}