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1 package org.drools.tags.rule; 2 3 /* 4 $Id: ParameterTag.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.XMLOutput; 52 import org.drools.rule.Declaration; 53 import org.drools.rule.Rule; 54 55 /*** Construct a root fact object parameter <code>Declaration</code> 56 * for a <code>Rule</code>. 57 * 58 * @see DeclarationTag 59 * @see Declaration 60 * 61 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 62 * 63 * @version $Id: ParameterTag.java,v 1.4 2003/03/25 19:47:32 tdiesler Exp $ 64 */ 65 public class ParameterTag extends DeclarationTag 66 { 67 // ------------------------------------------------------------ 68 // Constructors 69 // ------------------------------------------------------------ 70 71 /*** Construct. 72 */ 73 public ParameterTag() 74 { 75 // intentionally left blank 76 } 77 78 // ------------------------------------------------------------ 79 // Instance methods 80 // ------------------------------------------------------------ 81 82 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 83 // org.apache.commons.jelly.Tag 84 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 85 86 /*** Perform this tag. 87 * 88 * @param output The output sink. 89 * 90 * @throws JellyTagException If an error occurs while attempting 91 * to perform this tag. 92 */ 93 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException 94 { 95 verifyAttributes(); 96 97 Rule rule = getRule(); 98 99 if ( rule == null ) 100 { 101 throw new JellyTagException( "No rule available" ); 102 } 103 104 Declaration decl = createDeclaration( output ); 105 106 String var = getVar(); 107 108 if ( var != null ) 109 { 110 getContext().setVariable( var, 111 decl ); 112 } 113 114 rule.addParameterDeclaration( decl ); 115 } 116 }

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