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1 package org.drools.tags.knowledge; 2 3 /* 4 $Id: LoadRulesTag.java,v 1.5 2003/03/25 19:47:32 tdiesler 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 org.apache.commons.jelly.JellyTagException; 50 import org.apache.commons.jelly.MissingAttributeException; 51 import org.apache.commons.jelly.TagSupport; 52 import org.apache.commons.jelly.XMLOutput; 53 import org.drools.RuleBase; 54 import org.drools.io.RuleSetLoader; 55 import org.drools.rule.RuleSet; 56 57 import java.io.File; 58 import java.net.URL; 59 import java.util.Iterator; 60 import java.util.List; 61 62 /*** Load <code>Rule</code>s and <code>RuleSet</code>s 63 * into a <code>RuleBase</code>. 64 * 65 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 66 * 67 * @version $Id: LoadRulesTag.java,v 1.5 2003/03/25 19:47:32 tdiesler Exp $ 68 */ 69 public class LoadRulesTag extends TagSupport 70 { 71 // ------------------------------------------------------------ 72 // Instance members 73 // ------------------------------------------------------------ 74 75 /*** The uri. */ 76 private String uri; 77 78 /*** The file. */ 79 private String file; 80 81 // ------------------------------------------------------------ 82 // Constructors 83 // ------------------------------------------------------------ 84 85 /*** Construct. 86 */ 87 public LoadRulesTag() 88 { 89 super( true ); 90 } 91 92 // ------------------------------------------------------------ 93 // Instance methods 94 // ------------------------------------------------------------ 95 96 /*** Set the URI to load. 97 * 98 * @param uri The URI to load. 99 */ 100 public void setUri(String uri) 101 { 102 this.uri = uri; 103 } 104 105 /*** Set the file to load. 106 * 107 * @param file The file to load. 108 */ 109 public void setFile(String file) 110 { 111 this.file = file; 112 } 113 114 /*** Retrieve the URI to load. 115 * 116 * @return The URI to load. 117 */ 118 public String getUri() 119 { 120 return this.uri; 121 } 122 123 /*** Retrieve the file to load. 124 * 125 * @return The file to load. 126 */ 127 public String getFile() 128 { 129 return this.file; 130 } 131 132 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 133 // org.apache.commons.jelly.Tag 134 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 135 136 /*** Perform this tag. 137 * 138 * @param output The output sink. 139 * 140 * @throws JellyTagException If an error occurs while attempting 141 * to perform this tag. 142 */ 143 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException 144 { 145 if ( getUri() == null 146 && 147 getFile() == null ) 148 { 149 throw new MissingAttributeException( "uri or file" ); 150 } 151 152 RuleBaseTag tag = (RuleBaseTag) findAncestorWithClass( RuleBaseTag.class ); 153 154 if ( tag == null ) 155 { 156 throw new JellyTagException( "<load-rules> may only be used within a <rule-set>" ); 157 } 158 159 URL url = null; 160 161 try 162 { 163 if (getUri() != null) 164 { 165 url = new URL( getUri() ); 166 } 167 else 168 { 169 File file = new File( getFile() ); 170 171 url = file.toURL(); 172 } 173 174 RuleSetLoader loader = new RuleSetLoader(); 175 176 List ruleSets = loader.load( url ); 177 178 RuleBase ruleBase = tag.getRuleBase(); 179 180 Iterator ruleSetIter = ruleSets.iterator(); 181 RuleSet eachRuleSet = null; 182 183 while ( ruleSetIter.hasNext() ) 184 { 185 eachRuleSet = (RuleSet) ruleSetIter.next(); 186 ruleBase.addRuleSet( eachRuleSet ); 187 } 188 } 189 catch (Exception e) 190 { 191 throw new JellyTagException( e ); 192 } 193 } 194 }

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