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Java > Open Source Codes > net > sf > retrotranslator > transformer > ReplacementLocatorFactory


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.transformer;
33
34 import java.lang.ref.SoftReference JavaDoc;
35 import java.util.*;
36 import static net.sf.retrotranslator.transformer.TransformerTools.*;
37
38 /**
39  * @author Taras Puchko
40  */

41 class ReplacementLocatorFactory {
42
43     private static final String JavaDoc JAVA_UTIL_CONCURRENT = "java/util/concurrent/";
44
45     private final ClassVersion target;
46     private final boolean advanced;
47     private final boolean retainapi;
48     private List<Backport> backports;
49
50     private SoftReference JavaDoc<ReplacementLocator> softReference = new SoftReference JavaDoc<ReplacementLocator>(null);
51
52     public ReplacementLocatorFactory(ClassVersion target, boolean advanced, boolean retainapi, List<Backport> backports) {
53         this.target = target;
54         this.advanced = advanced;
55         this.retainapi = retainapi;
56         this.backports = backports;
57         if (target == ClassVersion.VERSION_14 && !retainapi) {
58             addDefault(backports);
59         }
60     }
61
62     private void addDefault(List<Backport> backports) {
63         backports.add(new Backport("", RUNTIME_PREFIX, null, null));
64         backports.add(new Backport(null, null, "java/lang/StringBuilder", "java/lang/StringBuffer"));
65         backports.add(new Backport(JAVA_UTIL_CONCURRENT, CONCURRENT_PREFIX + JAVA_UTIL_CONCURRENT, null, null));
66         for (String JavaDoc name : new String JavaDoc[]{"java/util/Deque", "java/util/ArrayDeque",
67                 "java/util/Queue", "java/util/AbstractQueue", "java/util/PriorityQueue"}) {
68             backports.add(new Backport(null, null, name, CONCURRENT_PREFIX + name));
69         }
70     }
71
72     public ClassVersion getTarget() {
73         return target;
74     }
75
76     public boolean isAdvanced() {
77         return advanced;
78     }
79
80     public boolean isRetainapi() {
81         return retainapi;
82     }
83
84     public boolean isEmpty() {
85         return backports.isEmpty();
86     }
87
88     public synchronized ReplacementLocator getLocator() {
89         ReplacementLocator locator = softReference.get();
90         if (locator == null) {
91             locator = new ReplacementLocator(advanced, backports);
92             softReference = new SoftReference JavaDoc<ReplacementLocator>(locator);
93         }
94         return locator;
95     }
96
97 }
98
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