1 package org.drools.tags.knowledge;
2
3 /*
4 $Id: LoadRulesTag.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.TagSupport;
52 import org.apache.commons.jelly.XMLOutput;
53 import org.drools.RuleBase;
54 import org.drools.io.RuleSetLoader;
55 import org.drools.rule.RuleSet;
56
57 import java.io.File;
58 import java.net.URL;
59 import java.util.Iterator;
60 import java.util.List;
61
62 /*** Load <code>Rule</code>s and <code>RuleSet</code>s
63 * into a <code>RuleBase</code>.
64 *
65 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
66 *
67 * @version $Id: LoadRulesTag.java,v 1.5 2003/03/25 19:47:32 tdiesler Exp $
68 */
69 public class LoadRulesTag extends TagSupport
70 {
71 // ------------------------------------------------------------
72 // Instance members
73 // ------------------------------------------------------------
74
75 /*** The uri. */
76 private String uri;
77
78 /*** The file. */
79 private String file;
80
81 // ------------------------------------------------------------
82 // Constructors
83 // ------------------------------------------------------------
84
85 /*** Construct.
86 */
87 public LoadRulesTag()
88 {
89 super( true );
90 }
91
92 // ------------------------------------------------------------
93 // Instance methods
94 // ------------------------------------------------------------
95
96 /*** Set the URI to load.
97 *
98 * @param uri The URI to load.
99 */
100 public void setUri(String uri)
101 {
102 this.uri = uri;
103 }
104
105 /*** Set the file to load.
106 *
107 * @param file The file to load.
108 */
109 public void setFile(String file)
110 {
111 this.file = file;
112 }
113
114 /*** Retrieve the URI to load.
115 *
116 * @return The URI to load.
117 */
118 public String getUri()
119 {
120 return this.uri;
121 }
122
123 /*** Retrieve the file to load.
124 *
125 * @return The file to load.
126 */
127 public String getFile()
128 {
129 return this.file;
130 }
131
132 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
133 // org.apache.commons.jelly.Tag
134 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
135
136 /*** Perform this tag.
137 *
138 * @param output The output sink.
139 *
140 * @throws JellyTagException If an error occurs while attempting
141 * to perform this tag.
142 */
143 public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException
144 {
145 if ( getUri() == null
146 &&
147 getFile() == null )
148 {
149 throw new MissingAttributeException( "uri or file" );
150 }
151
152 RuleBaseTag tag = (RuleBaseTag) findAncestorWithClass( RuleBaseTag.class );
153
154 if ( tag == null )
155 {
156 throw new JellyTagException( "<load-rules> may only be used within a <rule-set>" );
157 }
158
159 URL url = null;
160
161 try
162 {
163 if (getUri() != null)
164 {
165 url = new URL( getUri() );
166 }
167 else
168 {
169 File file = new File( getFile() );
170
171 url = file.toURL();
172 }
173
174 RuleSetLoader loader = new RuleSetLoader();
175
176 List ruleSets = loader.load( url );
177
178 RuleBase ruleBase = tag.getRuleBase();
179
180 Iterator ruleSetIter = ruleSets.iterator();
181 RuleSet eachRuleSet = null;
182
183 while ( ruleSetIter.hasNext() )
184 {
185 eachRuleSet = (RuleSet) ruleSetIter.next();
186 ruleBase.addRuleSet( eachRuleSet );
187 }
188 }
189 catch (Exception e)
190 {
191 throw new JellyTagException( e );
192 }
193 }
194 }
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