View Javadoc
1 package org.drools.tags.rule; 2 3 /* 4 $Id: DeclarationTag.java,v 1.6 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 import org.drools.spi.ObjectType; 55 56 /*** Construct a <code>Declaration</code> for a <code>Rule</code>. 57 * 58 * @see Declaration 59 * 60 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 61 * 62 * @version $Id: DeclarationTag.java,v 1.6 2003/03/25 19:47:32 tdiesler Exp $ 63 */ 64 public class DeclarationTag extends RuleTagSupport implements ObjectTypeReceptor 65 { 66 // ------------------------------------------------------------ 67 // Instance members 68 // ------------------------------------------------------------ 69 70 /*** The identifier. */ 71 private String identifier; 72 73 /*** The semantic type. */ 74 private ObjectType objectType; 75 76 /*** The variable. */ 77 private String var; 78 79 // ------------------------------------------------------------ 80 // Constructors 81 // ------------------------------------------------------------ 82 83 /*** Construct. 84 */ 85 public DeclarationTag() 86 { 87 this.identifier = null; 88 } 89 90 /*** Set the identifier. 91 * 92 * @param identifier The identifier. 93 */ 94 public void setIdentifier(String identifier) 95 { 96 this.identifier = identifier; 97 } 98 99 /*** Retrieve the identifier. 100 * 101 * @return The identifier. 102 */ 103 public String getIdentifier() 104 { 105 return this.identifier; 106 } 107 108 /*** Set the <code>ObjectType</code>. 109 * 110 * @param objectType The object type. 111 */ 112 public void setObjectType(ObjectType objectType) 113 { 114 this.objectType = objectType; 115 } 116 117 /*** Set the variable in which to store the <code>Declaration</code>. 118 * 119 * @param var The variable name. 120 */ 121 public void setVar(String var) 122 { 123 this.var = var; 124 } 125 126 /*** Retrieve the variable in which to store the <code>Declaration</code>. 127 * 128 * @return The variable name. 129 */ 130 public String getVar() 131 { 132 return this.var; 133 } 134 135 /*** Verify required attributes. 136 * 137 * @throws MissingAttributeException If a required 138 * attribute is not present. 139 */ 140 protected void verifyAttributes() throws MissingAttributeException 141 { 142 requiredAttribute( "identifier", 143 this.identifier ); 144 } 145 146 /*** Create the <code>Declaration</code>. 147 * 148 * @param output The output sink. 149 * 150 * @return The configured declaration. 151 * 152 * @throws JellyTagException If an error occurs while attempting to 153 * configure the declaration. 154 */ 155 protected Declaration createDeclaration(XMLOutput output) throws JellyTagException 156 { 157 invokeBody( output ); 158 159 if ( this.objectType == null ) 160 { 161 throw new JellyTagException( "No object type specified" ); 162 } 163 164 Declaration decl = new Declaration( this.objectType, 165 getIdentifier() ); 166 167 return decl; 168 } 169 170 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 171 // org.drools.tags.rule.ObjectTypeReceptor 172 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 173 174 /*** Receive the <code>ObjectType</code>. 175 * 176 * @param objectType The object type. 177 */ 178 public void receiveObjectType(ObjectType objectType) 179 { 180 setObjectType( objectType ); 181 } 182 183 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 184 // org.apache.commons.jelly.Tag 185 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 186 187 /*** Perform this tag. 188 * 189 * @param output The output sink. 190 * 191 * @throws JellyTagException If an error occurs while attempting 192 * to perform this tag. 193 */ 194 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException 195 { 196 verifyAttributes(); 197 198 Declaration decl = createDeclaration( output ); 199 200 201 if ( this.var != null ) 202 { 203 getContext().setVariable( this.var, 204 decl ); 205 } 206 207 getContext().setVariable( "org.drools.declaration", 208 decl ); 209 210 Rule rule = getRule(); 211 212 if ( rule != null ) 213 { 214 rule.addDeclaration( decl ); 215 } 216 } 217 }

This page was automatically generated by Maven