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Java > Open Source Codes > de > laures > cewolf > taglib > tags > ProducerTag


1 /* ================================================================
2  * Cewolf : Chart enabling Web Objects Framework
3  * ================================================================
4  *
5  * Project Info: http://cewolf.sourceforge.net
6  * Project Lead: Guido Laures (guido@laures.de);
7  *
8  * (C) Copyright 2002, by Guido Laures
9  *
10  * This library is free software; you can redistribute it and/or modify it under the terms
11  * of the GNU Lesser General Public License as published by the Free Software Foundation;
12  * either version 2.1 of the License, or (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
15  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16  * See the GNU Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public License along with this
19  * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20  * Boston, MA 02111-1307, USA.
21  */
22
23 package de.laures.cewolf.taglib.tags;
24
25 import javax.servlet.jsp.JspException JavaDoc;
26
27 import de.laures.cewolf.DatasetProducer;
28 import de.laures.cewolf.taglib.DataAware;
29
30 /**
31  * Tag <producer> which defines a DatasetProducer.
32  * @see DataTag
33  * @author Guido Laures
34  */
35 public class ProducerTag extends AbstractParameterizedObjectTag {
36
37     private boolean useCache = true;
38
39     public int doEndTag() throws JspException JavaDoc {
40         DatasetProducer dataProducer = null;
41         try {
42             dataProducer = (DatasetProducer) getObject();
43             if (dataProducer == null) {
44                 throw new JspException JavaDoc("Could not find datasetproducer under ID '" + getId() + "'");
45             }
46         } catch (ClassCastException JavaDoc cce) {
47             throw new JspException JavaDoc(
48                 "Bean under ID '"
49                     + getId()
50                     + "' is of type '"
51                     + getObject().getClass().getName()
52                     + "'.\nType expected:"
53                     + DatasetProducer.class.getName());
54         }
55         DataAware dw = (DataAware) findAncestorWithClass(this, DataAware.class);
56         log.debug("setting data config on " + dw);
57         log.debug("useCache = " + useCache);
58         addParameter(DatasetProducer.PRODUCER_ATTRIBUTE_NAME, getId());
59         dw.setDataProductionConfig(dataProducer, getParameters(), useCache);
60         return doAfterEndTag(EVAL_BODY_INCLUDE);
61     }
62
63     /**
64      * Sets the useCache.
65      * @param useCache The useCache to set
66      */
67     public void setUsecache(boolean useCache) {
68         this.useCache = useCache;
69     }
70
71 }
72
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