View Javadoc
1 package org.drools.tags.knowledge; 2 3 /* 4 $Id: FactTagSupport.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.drools.WorkingMemory; 53 54 /*** Support for fact tags. 55 * 56 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 57 * 58 * @version $Id: FactTagSupport.java,v 1.4 2003/03/25 19:47:32 tdiesler Exp $ 59 */ 60 public abstract class FactTagSupport extends TagSupport 61 { 62 // ------------------------------------------------------------ 63 // Instance mebers 64 // ------------------------------------------------------------ 65 66 /*** The fact object. */ 67 private Object fact; 68 69 // ------------------------------------------------------------ 70 // Constructors 71 // ------------------------------------------------------------ 72 73 /*** Construct. 74 */ 75 protected FactTagSupport() 76 { 77 super( true ); 78 } 79 80 // ------------------------------------------------------------ 81 // Instance methods 82 // ------------------------------------------------------------ 83 84 /*** Set the fact object. 85 * 86 * @param fact The fact object. 87 */ 88 public void setFact(Object fact) 89 { 90 this.fact = fact; 91 } 92 93 /*** Retrieve the fact object. 94 * 95 * @return The fact object. 96 */ 97 public Object getFact() 98 { 99 return this.fact; 100 } 101 102 /*** Validate required attributes. 103 * 104 * @throws MissingAttributeException If a required attribute is missing. 105 */ 106 protected void validateAttributes() throws MissingAttributeException 107 { 108 if ( this.fact == null ) 109 { 110 throw new MissingAttributeException( "fact" ); 111 } 112 } 113 114 /*** Retrieve the current <code>WorkingMemory</code>. 115 * 116 * @return The working memory. 117 * 118 * @throws JellyTagException If a working memory cannot be retrieved. 119 */ 120 protected WorkingMemory getWorkingMemory() throws JellyTagException 121 { 122 WorkingMemory memory = (WorkingMemory) getContext().getVariable( "org.drools.working-memory" ); 123 124 if ( memory == null ) 125 { 126 KnowledgeTag tag = (KnowledgeTag) findAncestorWithClass( KnowledgeTag.class ); 127 128 if ( tag == null ) 129 { 130 throw new JellyTagException( "No working memory available" ); 131 } 132 133 return tag.getMemory(); 134 } 135 136 return memory; 137 } 138 }

This page was automatically generated by Maven