1 /*
2 * PROJECT : DAR Runtime and Tools
3 * COPYRIGHT : Copyright (C) 1999-2004 tim.stephenson@enableit.org
4 * LICENSE : GNU LESSER GENERAL PUBLIC LICENSE
5 * Version 2.1, February 1999
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 package org.enableit.db.darrt;
22
23 import java.util.ArrayList;
24 import java.util.Iterator;
25 import java.util.List;
26
27 import org.apache.log4j.Logger;
28 import org.enableit.db.beans.Provider;
29 import org.enableit.db.beans.RowSet;
30
31
32 /***
33 * @author Tim Stephenson
34 */
35 public class ConflictResolutionChain extends Object {
36 /***
37 * The Log4J <code>Logger</code> doing the logging.
38 */
39 private static Logger logger = Logger.getLogger(ConflictResolutionChain.class);
40
41 /***
42 * CVS info ABOUT this class and its current version
43 */
44 public static final String about = "$Revision $";
45
46 /*
47 * Properties
48 */
49 protected List resolvers;
50
51 /*
52 * Constructors
53 */
54
55 /***
56 * Default Constructor, returns an empty chain.
57 */
58 public ConflictResolutionChain() {
59 resolvers = new ArrayList();
60 }
61
62 /***
63 * Constructor, returns a chain constructed from info within row set.
64 */
65 public ConflictResolutionChain(RowSet rowSet) {
66 this();
67
68 ClassLoader cl = getClassLoader();
69
70 for (int i = 0; i < rowSet.getConflictResolverCount(); i++) {
71 try {
72 resolvers.add(cl.loadClass(rowSet.getConflictResolver(i))
73 .newInstance());
74 } catch (Exception e) {
75 logger.error("Problem loading conflict resolver: "
76 + rowSet.getConflictResolver(i));
77 }
78 }
79 }
80
81 /*
82 * Methods
83 */
84
85 /***
86 * @return ClassLoader to use in loading Conflit Resolvers.
87 */
88 protected ClassLoader getClassLoader() {
89 return ConflictResolutionChain.class.getClassLoader();
90 }
91
92 /***
93 * Attempt to resolve the conflicts thru the use of the resolvers in the chain.
94 */
95 public RowSet resolve(Provider target, RowSet unresolvedSet) {
96 for (Iterator i = resolvers.iterator(); i.hasNext();) {
97 ConflictResolver cr = (ConflictResolver) i.next();
98
99 unresolvedSet = cr.resolve(target, unresolvedSet);
100 }
101
102 return unresolvedSet;
103 }
104 }
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