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1 package org.drools.tags.semantics; 2 3 /* 4 $Id: SemanticModuleTag.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.smf.SimpleSemanticModule; 53 54 /*** Defines a <code>SemanticModule</code>. 55 * 56 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 57 */ 58 public class SemanticModuleTag extends SemanticsTagSupport 59 { 60 // ------------------------------------------------------------ 61 // Instance members 62 // ------------------------------------------------------------ 63 64 /*** The module. */ 65 private SimpleSemanticModule module; 66 67 /*** The uri. */ 68 private String uri; 69 70 /*** Variable to deposit resulting module into. */ 71 private String var; 72 73 // ------------------------------------------------------------ 74 // Constructors 75 // ------------------------------------------------------------ 76 77 /*** Construct. 78 */ 79 public SemanticModuleTag() 80 { 81 // intentionally left blank. 82 } 83 84 // ------------------------------------------------------------ 85 // Instance methods 86 // ------------------------------------------------------------ 87 88 /*** Retrieve the <code>SemanticModule</code>. 89 * 90 * @return The semantic module. 91 */ 92 public SimpleSemanticModule getSemanticModule() 93 { 94 return this.module; 95 } 96 97 /*** Set the URI. 98 * 99 * @param uri The URI. 100 */ 101 public void setUri(String uri) 102 { 103 this.uri = uri; 104 } 105 106 /*** Retrieve the URI. 107 * 108 * @return The URI. 109 */ 110 public String getUri() 111 { 112 return this.uri; 113 } 114 115 /*** Set the variable in which to store the resulting 116 * <code>SemanticModule</code>. 117 * 118 * <p> 119 * In addition to any variable specified using 120 * this method, the variable <code>org.drools.semantic-module</code> 121 * will also hold the new <code>SemanticModule</code>. 122 * </p> 123 * 124 * @param var The variable in which to store the new semantic module. 125 */ 126 public void setVar(String var) 127 { 128 this.var = var; 129 } 130 131 /*** Retrieve the variable in which to store the 132 * resulting <code>SemanticModule</code>. 133 * 134 * @return The variable name. 135 */ 136 public String getVar() 137 { 138 return this.var; 139 } 140 141 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 142 // org.apache.commons.jelly.Tag 143 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 144 145 /*** Perform this tag. 146 * 147 * @param output The output sink. 148 * 149 * @throws JellyTagException If an error occurs while attempting 150 * to perform this tag. 151 */ 152 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException 153 { 154 if ( getUri() == null ) 155 { 156 throw new MissingAttributeException( "uri" ); 157 } 158 159 this.module = new SimpleSemanticModule( getUri() ); 160 161 if ( getVar() != null ) 162 { 163 getContext().setVariable( getVar(), 164 this.module ); 165 } 166 167 getContext().setVariable( "org.drools.semantic-module", 168 this.module ); 169 170 invokeBody( output ); 171 172 this.module = null; 173 this.uri = null; 174 } 175 } 176

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