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1 package org.drools.tags.rule; 2 3 /* 4 $Id: ConditionTag.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.XMLOutput; 52 import org.drools.rule.Rule; 53 import org.drools.spi.Condition; 54 55 /*** Construct a <code>Condition</code> for a <code>Rule</code>. 56 * 57 * @see Condition 58 * 59 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 60 * 61 * @version $Id: ConditionTag.java,v 1.5 2003/03/25 19:47:32 tdiesler Exp $ 62 */ 63 public class ConditionTag extends RuleTagSupport implements ConditionReceptor 64 { 65 // ------------------------------------------------------------ 66 // Instance members 67 // ------------------------------------------------------------ 68 69 /*** The condition.*/ 70 private Condition condition; 71 72 /*** The variable. */ 73 private String var; 74 75 // ------------------------------------------------------------ 76 // Constructors 77 // ------------------------------------------------------------ 78 79 /*** Construct. 80 */ 81 public ConditionTag() 82 { 83 this.condition = null; 84 } 85 86 // ------------------------------------------------------------ 87 // Instance members 88 // ------------------------------------------------------------ 89 90 /*** Set the <code>Condition</code>. 91 * 92 * @param condition The condition. 93 */ 94 public void setCondition(Condition condition) 95 { 96 this.condition = condition; 97 } 98 99 /*** Retrieve the <code>Condition</code>. 100 * 101 * @return The condition. 102 */ 103 public Condition getCondition() 104 { 105 return this.condition; 106 } 107 108 /*** Set the variable in which to store the <code>Condition</code>. 109 * 110 * @param var The variable name. 111 */ 112 public void setVar(String var) 113 { 114 this.var = var; 115 } 116 117 /*** Retrieve the variable in which to store the <code>Condition</code>. 118 * 119 * @return The variable name. 120 */ 121 public String getVar() 122 { 123 return this.var; 124 } 125 126 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 127 // org.drools.tags.rule.ConditionReceptor 128 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 129 130 /*** Receive a <code>Condition</code>. 131 * 132 * @param condition The condition. 133 */ 134 public void receiveCondition(Condition condition) 135 { 136 setCondition( condition ); 137 } 138 139 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 140 // org.apache.commons.jelly.Tag 141 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 142 143 /*** Perform this tag. 144 * 145 * @param output The output sink. 146 * 147 * @throws JellyTagException If an error occurs while attempting 148 * to perform this tag. 149 */ 150 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException 151 { 152 Rule rule = getRule(); 153 154 if ( rule == null ) 155 { 156 throw new JellyTagException( "No rule available" ); 157 } 158 159 invokeBody( output ); 160 161 if ( this.condition == null ) 162 { 163 throw new JellyTagException( "Condition expected" ); 164 } 165 166 if ( this.var != null ) 167 { 168 getContext().setVariable( this.var, 169 this.condition ); 170 } 171 172 rule.addCondition( this.condition ); 173 } 174 }

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