1 package org.drools;
2
3 /*
4 $Id: MultiRepository.java,v 1.3 2002/08/02 19:43:11 bob Exp $
5
6 Copyright 2002 (C) The Werken Company. All Rights Reserved.
7
8 Redistribution and use of this software and associated documentation
9 ("Software"), with or without modification, are permitted provided
10 that the following conditions are met:
11
12 1. Redistributions of source code must retain copyright
13 statements and notices. Redistributions must also contain a
14 copy of this document.
15
16 2. Redistributions in binary form must reproduce the
17 above copyright notice, this list of conditions and the
18 following disclaimer in the documentation and/or other
19 materials provided with the distribution.
20
21 3. The name "drools" must not be used to endorse or promote
22 products derived from this Software without prior written
23 permission of The Werken Company. For written permission,
24 please contact bob@werken.com.
25
26 4. Products derived from this Software may not be called "drools"
27 nor may "drools" appear in their names without prior written
28 permission of The Werken Company. "drools" is a registered
29 trademark of The Werken Company.
30
31 5. Due credit should be given to The Werken Company.
32 (http://drools.werken.com/).
33
34 THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS
35 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
36 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
37 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
38 THE WERKEN COMPANY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
39 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
40 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
41 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
42 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
43 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
44 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
45 OF THE POSSIBILITY OF SUCH DAMAGE.
46
47 */
48
49 import java.util.List;
50 import java.util.ArrayList;
51 import java.util.Iterator;
52
53 /*** Aggregating <code>RuleBaseRepository</code> that searches
54 * multiple repositories, in order.
55 *
56 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
57 */
58 public class MultiRepository implements RuleBaseRepository
59 {
60 // ------------------------------------------------------------
61 // Instance members
62 // ------------------------------------------------------------
63
64 /*** Ordered list of repositories. */
65 private List repositories;
66
67 // ------------------------------------------------------------
68 // Constructors
69 // ------------------------------------------------------------
70
71 /*** Construct.
72 */
73 public MultiRepository()
74 {
75 this.repositories = new ArrayList();
76 }
77
78 // ------------------------------------------------------------
79 // Instance methods
80 // ------------------------------------------------------------
81
82 /*** Add a repository to the end of the search list.
83 *
84 * @param repository The repository to add.
85 */
86 public void addRepository(RuleBaseRepository repository)
87 {
88 this.repositories.add( repository );
89 }
90
91 /*** Retrieve a <code>RuleBase</code> by URI.
92 *
93 * @param uri The identifying URI of the <code>RuleBase</code>.
94 *
95 * @return The located <code>RuleBase</code>.
96 *
97 * @throws NoSuchRuleBaseException If no <code>RuleBase</code>
98 * can be located.
99 */
100 public RuleBase lookupRuleBase(String uri) throws NoSuchRuleBaseException
101 {
102 Iterator repoIter = this.repositories.iterator();
103 RuleBaseRepository eachRepo = null;
104
105 RuleBase ruleBase = null;
106
107 while ( repoIter.hasNext() )
108 {
109 eachRepo = (RuleBaseRepository) repoIter.next();
110
111 try
112 {
113 ruleBase = eachRepo.lookupRuleBase( uri );
114 return ruleBase;
115 }
116 catch (NoSuchRuleBaseException e)
117 {
118 // ignore
119 }
120 }
121
122 throw new NoSuchRuleBaseException( uri );
123 }
124
125 /*** Register a <code>RuleBase</code> by URI.
126 *
127 * @param uri The uri.
128 * @param ruleBase The rule base.
129 */
130 public void registerRuleBase(String uri,
131 RuleBase ruleBase)
132 {
133 throw new UnsupportedOperationException( "MultiRepository.regusterRuleBase(..)" );
134 }
135 }
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