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1 package org.drools.tags.knowledge; 2 3 /* 4 $Id: RuleBaseTag.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.RuleIntegrationException; 55 import org.drools.rule.Rule; 56 import org.drools.rule.RuleSet; 57 58 /*** Create a <code>RuleBase</code>. 59 * 60 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 61 * 62 * @version $Id: RuleBaseTag.java,v 1.5 2003/03/25 19:47:32 tdiesler Exp $ 63 */ 64 public class RuleBaseTag extends TagSupport 65 { 66 // ------------------------------------------------------------ 67 // Instance members 68 // ------------------------------------------------------------ 69 70 /*** The rule-base. */ 71 private RuleBase ruleBase; 72 73 /*** The variable. */ 74 private String var; 75 76 // ------------------------------------------------------------ 77 // Constructors 78 // ------------------------------------------------------------ 79 80 /*** Construct. 81 */ 82 public RuleBaseTag() 83 { 84 super( true ); 85 this.ruleBase = null; 86 } 87 88 // ------------------------------------------------------------ 89 // Instance methods 90 // ------------------------------------------------------------ 91 92 /*** Set the variable in which to store the <code>RuleBase</code>. 93 * 94 * @param var The variable name. 95 */ 96 public void setVar(String var) 97 { 98 this.var = var; 99 } 100 101 /*** Retrieve the variable in which to store the <code>RuleBase</code>. 102 * 103 * @return The variable name. 104 */ 105 public String getVar() 106 { 107 return this.var; 108 } 109 110 /*** Retrieve the <code>RuleBase</code>. 111 * 112 * @return The rule-base. 113 */ 114 public RuleBase getRuleBase() 115 { 116 return this.ruleBase; 117 } 118 119 /*** Add a <code>RuleSet</code> to the <code>RuleBase</code>. 120 * 121 * @param ruleSet The rule-set to add. 122 * 123 * @throws JellyTagException If an error occurs while attempting 124 * to add the rule-set. 125 */ 126 public void addRuleSet(RuleSet ruleSet) throws JellyTagException 127 { 128 try 129 { 130 getRuleBase().addRuleSet( ruleSet ); 131 } 132 catch (RuleIntegrationException e) 133 { 134 throw new JellyTagException( e ); 135 } 136 } 137 138 /*** Add a <code>Rule</code> to the <code>RuleBase</code>. 139 * 140 * @param rule The rule to add. 141 * 142 * @throws JellyTagException If an error occurs while attempting 143 * to add the rule. 144 */ 145 public void addRule(Rule rule) throws JellyTagException 146 { 147 try 148 { 149 getRuleBase().addRule( rule ); 150 } 151 catch (RuleIntegrationException e) 152 { 153 throw new JellyTagException( e ); 154 } 155 } 156 157 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 158 // org.apache.commons.jelly.Tag 159 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 160 161 /*** Perform this tag. 162 * 163 * @param output The output sink. 164 * 165 * @throws JellyTagException If an error occurs while attempting 166 * to perform this tag. 167 */ 168 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException 169 { 170 if ( this.var == null ) 171 { 172 throw new MissingAttributeException( "var" ); 173 } 174 175 this.ruleBase = new RuleBase(); 176 177 getContext().setVariable( this.var, 178 this.ruleBase ); 179 180 invokeBody( output ); 181 } 182 }

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