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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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