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Java > Open Source Codes > net > sf > retrotranslator > runtime > impl > WildcardTypeImpl


1 /***
2  * Retrotranslator: a Java bytecode transformer that translates Java classes
3  * compiled with JDK 5.0 into classes that can be run on JVM 1.4.
4  *
5  * Copyright (c) 2005 - 2007 Taras Puchko
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in the
15  * documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the copyright holders nor the names of its
17  * contributors may be used to endorse or promote products derived from
18  * this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30  * THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 package net.sf.retrotranslator.runtime.impl;
33
34 import java.lang.reflect.*;
35 import java.util.Arrays JavaDoc;
36
37 /**
38  * @author Taras Puchko
39  */
40 public class WildcardTypeImpl implements WildcardType {
41
42     private static final Type[] DEFAULT_UPPER_BOUND = new Type[]{Object JavaDoc.class};
43     private static final Type[] DEFAULT_LOWER_BOUND = new Type[0];
44
45     private boolean isUpperBounds;
46     private LazyValue<TypeDescriptor, Type> bound;
47
48     public WildcardTypeImpl(boolean isUpperBounds, LazyValue<TypeDescriptor, Type> bound) {
49         this.isUpperBounds = isUpperBounds;
50         this.bound = bound;
51     }
52
53     public Type[] getUpperBounds() {
54         return isUpperBounds && bound != null ? new Type[]{bound.get()} : DEFAULT_UPPER_BOUND;
55     }
56
57     public Type[] getLowerBounds() {
58         return isUpperBounds || bound == null ? DEFAULT_LOWER_BOUND : new Type[]{bound.get()};
59     }
60
61     public int hashCode() {
62         return Arrays.hashCode(getUpperBounds()) ^ Arrays.hashCode(getLowerBounds());
63     }
64
65     public boolean equals(Object JavaDoc obj) {
66         if (obj instanceof WildcardType) {
67             if (obj == this) return true;
68             WildcardType type = ((WildcardType) obj);
69             return Arrays.equals(getUpperBounds(), type.getUpperBounds()) &&
70                     Arrays.equals(getLowerBounds(), type.getLowerBounds());
71         }
72         return false;
73     }
74
75     public String JavaDoc toString() {
76         if (bound == null) return "?";
77         Type bound = this.bound.get();
78         return (isUpperBounds ? "? extends " : "? super ") +
79                 (bound instanceof Class JavaDoc ? ((Class JavaDoc) bound).getName() : bound.toString());
80     }
81
82 }
83
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