01: /***
02: * Retrotranslator: a Java bytecode transformer that translates Java classes
03: * compiled with JDK 5.0 into classes that can be run on JVM 1.4.
04: *
05: * Copyright (c) 2005 - 2008 Taras Puchko
06: * All rights reserved.
07: *
08: * Redistribution and use in source and binary forms, with or without
09: * 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: */package net.sf.retrotranslator.transformer;
32:
33: import java.lang.ref.SoftReference;
34: import java.util.*;
35:
36: /**
37: * @author Taras Puchko
38: */
39: class ReplacementLocatorFactory {
40:
41: private final OperationMode mode;
42: private final boolean retainapi;
43: private final List<Backport> backports;
44: private final TargetEnvironment environment;
45:
46: private SoftReference<ReplacementLocator> softReference = new SoftReference<ReplacementLocator>(
47: null);
48:
49: public ReplacementLocatorFactory(OperationMode mode,
50: boolean retainapi, String backport,
51: TargetEnvironment environment) {
52: this .mode = mode;
53: this .retainapi = retainapi;
54: this .environment = environment;
55: this .backports = new Vector<Backport>();
56: for (String s : getBackportNames(backport)) {
57: backports.addAll(Backport.getBackports(s));
58: }
59: }
60:
61: private Collection<String> getBackportNames(String backport) {
62: LinkedHashSet<String> result = new LinkedHashSet<String>();
63: if (backport != null) {
64: result.addAll(Arrays.asList(backport.split(";")));
65: }
66: if (!retainapi) {
67: ClassVersion target = mode.getTarget();
68: result.addAll(environment.readRegistry("backport", target));
69: if (target.isBefore(ClassVersion.VERSION_15)) {
70: result
71: .add("java.lang.StringBuilder:java.lang.StringBuffer");
72: }
73: }
74: return result;
75: }
76:
77: public OperationMode getMode() {
78: return mode;
79: }
80:
81: public boolean isRetainapi() {
82: return retainapi;
83: }
84:
85: public synchronized ReplacementLocator getLocator() {
86: ReplacementLocator locator = softReference.get();
87: if (locator == null) {
88: locator = new ReplacementLocator(mode, backports,
89: environment);
90: softReference = new SoftReference<ReplacementLocator>(
91: locator);
92: }
93: return locator;
94: }
95: }
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