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1 package org.drools.tags.rule; 2 3 /* 4 $Id: RuleTag.java,v 1.5 2003/07/10 14:19:51 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.XMLOutput; 52 import org.drools.rule.Rule; 53 import org.drools.rule.RuleSet; 54 import org.drools.tags.knowledge.RuleBaseTag; 55 56 /*** Construct a <code>Rule</code> for a <code>RuleSet</code>. 57 * 58 * @see Rule 59 * 60 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 61 * 62 * @version $Id: RuleTag.java,v 1.5 2003/07/10 14:19:51 tdiesler Exp $ 63 */ 64 public class RuleTag extends RuleTagSupport 65 { 66 // ------------------------------------------------------------ 67 // Instance members 68 // ------------------------------------------------------------ 69 70 /*** Rule name. */ 71 private String name; 72 73 /*** Salience value. */ 74 private Integer salience; 75 76 /*** The rule. */ 77 private Rule rule; 78 79 /*** The variable. */ 80 private String var; 81 82 // ------------------------------------------------------------ 83 // Constructors 84 // ------------------------------------------------------------ 85 86 /*** Construct. 87 */ 88 public RuleTag() 89 { 90 // intentionally left blank 91 } 92 93 // ------------------------------------------------------------ 94 // Instance methods 95 // ------------------------------------------------------------ 96 97 /*** Set the <code>Rule<code> name. 98 * 99 * @param name The name. 100 */ 101 public void setName(String name) 102 { 103 this.name = name; 104 } 105 106 /*** Retrieve the <code>Rule</code> name. 107 * 108 * @return The name. 109 */ 110 public String getName() 111 { 112 return this.name; 113 } 114 115 /*** Retrieve the <code>Rule</code> salience. 116 * 117 * @return The salience. 118 */ 119 public Integer getSalience() 120 { 121 return salience; 122 } 123 124 /*** Set the <code>Rule<code> salience. 125 * 126 * @param salience The salience. 127 */ 128 public void setSalience( Integer salience ) 129 { 130 this.salience = salience; 131 } 132 133 /*** Set the variable in which to store the <code>Rule</code>. 134 * 135 * @param var The variable name. 136 */ 137 public void setVar(String var) 138 { 139 this.var = var; 140 } 141 142 /*** Retrieve the variable in which to store the <code>Rule</code>. 143 * 144 * @return The variable name. 145 */ 146 public String getVar() 147 { 148 return this.var; 149 } 150 151 /*** Retrieve the <code>Rule</code>. 152 * 153 * @return The rule. 154 */ 155 public Rule getRule() 156 { 157 return this.rule; 158 } 159 160 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 161 // org.apache.commons.jelly.Tag 162 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 163 164 /*** Perform this tag. 165 * 166 * @param output The output sink. 167 * 168 * @throws JellyTagException If an error occurs while attempting 169 * to perform this tag. 170 */ 171 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException 172 { 173 requiredAttribute( "name", 174 this.name ); 175 176 this.rule = new Rule( this.name ); 177 178 if ( this.salience != null ) 179 { 180 this.rule.setSalience( this.salience.intValue() ); 181 } 182 183 if ( this.var != null ) 184 { 185 getContext().setVariable( this.var, 186 this.rule ); 187 } 188 189 getContext().setVariable( "org.drools.rule", 190 this.rule ); 191 192 invokeBody( output ); 193 194 RuleSet ruleSet = getRuleSet(); 195 196 try 197 { 198 if ( ruleSet != null ) 199 { 200 ruleSet.addRule( this.rule ); 201 } 202 else 203 { 204 RuleBaseTag tag = (RuleBaseTag) findAncestorWithClass( RuleBaseTag.class ); 205 206 if ( tag != null ) 207 { 208 tag.addRule( this.rule ); 209 } 210 } 211 } 212 catch (Exception e) 213 { 214 throw new JellyTagException( e ); 215 } 216 } 217 }

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