01: /*
02: * Copyright (c) 2001-2007, Jean Tessier
03: * All rights reserved.
04: *
05: * Redistribution and use in source and binary forms, with or without
06: * modification, are permitted provided that the following conditions
07: * are met:
08: *
09: * * 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;
34:
35: import java.io.*;
36: import java.util.*;
37:
38: import org.apache.log4j.*;
39:
40: public class ModifiedOnlyDispatcher implements
41: ClassfileLoaderDispatcher {
42: private ClassfileLoaderDispatcher delegate;
43:
44: private Map<String, Long> timestamps = new HashMap<String, Long>();
45:
46: public ModifiedOnlyDispatcher(ClassfileLoaderDispatcher delegate) {
47: this .delegate = delegate;
48: }
49:
50: public Action dispatch(String filename) {
51: Action result = delegate.dispatch(filename);
52:
53: if (result == Action.CLASS) {
54: Long timestamp = timestamps.get(filename);
55: Logger.getLogger(getClass()).debug(
56: filename + " has timestamp " + timestamp);
57:
58: File file = new File(filename);
59: if (timestamp != null && timestamp >= file.lastModified()) {
60: Logger.getLogger(getClass()).debug(
61: "Already dispatched \"" + filename
62: + "\": IGNORE");
63: result = Action.IGNORE;
64: } else {
65: Logger.getLogger(getClass()).debug("Delegating ...");
66: timestamp = file.lastModified();
67: timestamps.put(filename, timestamp);
68: }
69: } else {
70: Logger.getLogger(getClass()).debug("Delegating ...");
71: }
72:
73: return result;
74: }
75: }
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