01: package org.mandarax.jdbc.server;
02:
03: /*
04: * Copyright (C) 1999-2004 <a href="mailto:mandarax@jbdietrich.com">Jens Dietrich</a>
05: *
06: * This library is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU Lesser General Public
08: * License as published by the Free Software Foundation; either
09: * version 2 of the License, or (at your option) any later version.
10: *
11: * This library is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: *
16: * You should have received a copy of the GNU Lesser General Public
17: * License along with this library; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19: */
20:
21: import org.mandarax.jdbc.JDBCUtils;
22: import org.mandarax.kernel.*;
23: import java.util.*;
24:
25: /**
26: * A knowledge base factory based on static map associating names and kb's.
27: * @author <A HREF="mailto:mandarax@jbdietrich.com">Jens Dietrich</A>
28: * @version 3.3.2 <29 December 2004>
29: * @since 3.1
30: */
31:
32: public class KnowledgeBaseRegistry extends AbstractKnowledgeBaseFactory {
33: private static Map registry = new Hashtable();
34:
35: /**
36: * Get a knowledge base.
37: * @return a knowledge base
38: * @param source the parameter string of the form className[:param]
39: * @throws an exception
40: */
41: public KnowledgeBase getKnowledgeBase(String source)
42: throws Exception {
43: String name = null;
44: int pos = source.indexOf(JDBCUtils.URL_SEPARATOR);
45: name = (pos > -1) ? source.substring(0, pos) : source;
46: return lookup(name);
47: }
48:
49: /**
50: * Indicates whether this factory is suitable to access knowledge bases
51: * using the given protocol.
52: * @param protocol a protocol (name) such as zkb, xkb, ruleml etc
53: * @return a boolean
54: */
55: public boolean supportsProtocol(String protocolName) {
56: return protocolName != null && protocolName.equals(REG);
57: }
58:
59: /**
60: * Add a name -> kb association
61: * @param name a name
62: * @param kb a knowledge base
63: */
64: public static void bind(String name, KnowledgeBase kb) {
65: registry.put(name, kb);
66: }
67:
68: /**
69: * Remove a name -> kb association
70: * @param name a name
71: * @return the kb removed or null if there is no kb registered under this name
72: */
73: public static KnowledgeBase unbind(String name) {
74: return (KnowledgeBase) registry.remove(name);
75: }
76:
77: /**
78: * Look up a name -> kb association
79: * @param name a name
80: * @return the kb or null if there is no kb registered under this name
81: */
82: public static KnowledgeBase lookup(String name) {
83: return (KnowledgeBase) registry.get(name);
84: }
85:
86: }
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