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1 package org.drools.tags.knowledge; 2 3 /* 4 $Id: KnowledgeTag.java,v 1.4 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.WorkingMemory; 55 56 /*** Work in a knowledge session. 57 * 58 * @see WorkingMemory 59 * 60 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 61 * 62 * @version $Id: KnowledgeTag.java,v 1.4 2003/03/25 19:47:32 tdiesler Exp $ 63 */ 64 public class KnowledgeTag extends TagSupport 65 { 66 // ------------------------------------------------------------ 67 // Instance members 68 // ------------------------------------------------------------ 69 70 /*** The variable. */ 71 private String var; 72 73 /*** Transactional flag. */ 74 private boolean transactional; 75 76 /*** The working memory. */ 77 private WorkingMemory workingMemory; 78 79 /*** The rule base. */ 80 private RuleBase ruleBase; 81 82 // ------------------------------------------------------------ 83 // Constructors 84 // ------------------------------------------------------------ 85 86 /*** Construct. 87 */ 88 public KnowledgeTag() 89 { 90 super( true ); 91 this.transactional = false; 92 } 93 94 // ------------------------------------------------------------ 95 // Instance methods 96 // ------------------------------------------------------------ 97 98 /*** Set the transactionality flag. 99 * 100 * @param transactional Transactionality flag. 101 */ 102 public void setTransactional(boolean transactional) 103 { 104 this.transactional = transactional; 105 } 106 107 /*** Retrieve the transactionality flag. 108 * 109 * @return The transactionality flag. 110 */ 111 public boolean getTransactional() 112 { 113 return this.transactional; 114 } 115 116 /*** Set the variable in which to store the <code>WorkingMemory</code>. 117 * 118 * @param var The variable name. 119 */ 120 public void setVar(String var) 121 { 122 this.var = var; 123 } 124 125 /*** Retrieve the variable in which to store the <code>WorkingMemory</code>. 126 * 127 * @return The variable name. 128 */ 129 public String getVar() 130 { 131 return this.var; 132 } 133 134 /*** Set the <code>WorkingMemory</code>. 135 * 136 * @param memory The working memory. 137 */ 138 public void setMemory(WorkingMemory memory) 139 { 140 this.workingMemory = memory; 141 } 142 143 /*** Retrieve the <code>WorkingMemory</code>. 144 * 145 * @return The working memory. 146 */ 147 public WorkingMemory getMemory() 148 { 149 return this.workingMemory; 150 } 151 152 /*** Set the <code>RuleBase</code>. 153 * 154 * @param ruleBase The rule-base. 155 */ 156 public void setRules(RuleBase ruleBase) 157 { 158 this.ruleBase = ruleBase; 159 } 160 161 /*** Retrieve the <code>RuleBase</code>. 162 * 163 * @return The rule-base. 164 */ 165 public RuleBase getRules() 166 { 167 return this.ruleBase; 168 } 169 170 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 171 // org.apache.commons.jelly.Tag 172 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 173 174 /*** Perform this tag. 175 * 176 * @param output The output sink. 177 * 178 * @throws JellyTagException If an error occurs while attempting 179 * to perform this tag. 180 */ 181 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException 182 { 183 if ( this.workingMemory == null 184 && 185 this.ruleBase == null ) 186 { 187 throw new JellyTagException( "Either 'memory' or 'rulebase' attribute must be specified" ); 188 } 189 190 if ( this.workingMemory == null ) 191 { 192 if ( this.transactional ) 193 { 194 this.workingMemory = this.ruleBase.createTransactionalWorkingMemory(); 195 } 196 else 197 { 198 this.workingMemory = this.ruleBase.createWorkingMemory(); 199 } 200 } 201 202 invokeBody( output ); 203 } 204 }

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