KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > net > sf > jasperreports > engine > util > JRQueryExecuterUtils


1 /*
2  * ============================================================================
3  * GNU Lesser General Public License
4  * ============================================================================
5  *
6  * JasperReports - Free Java report-generating library.
7  * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * 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,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
22  *
23  * JasperSoft Corporation
24  * 303 Second Street, Suite 450 North
25  * San Francisco, CA 94107
26  * http://www.jaspersoft.com
27  */
28 package net.sf.jasperreports.engine.util;
29
30 import net.sf.jasperreports.engine.JRException;
31 import net.sf.jasperreports.engine.query.JRQueryExecuterFactory;
32
33 /**
34  * Query executer utility class.
35  *
36  * @author Lucian Chirita (lucianc@users.sourceforge.net)
37  * @version $Id: JRQueryExecuterUtils.java 1229 2006-04-19 13:27:35 +0300 (Wed, 19 Apr 2006) teodord $
38  */
39 public class JRQueryExecuterUtils
40 {
41     private static final JRSingletonCache cache = new JRSingletonCache(JRQueryExecuterFactory.class);
42     
43     /**
44      * Returns a query executer factory for a query language.
45      *
46      * @param language the query language
47      * @return a query executer factory
48      * @throws JRException
49      * @see JRProperties#QUERY_EXECUTER_FACTORY_PREFIX
50      */
51     public static JRQueryExecuterFactory getQueryExecuterFactory(String JavaDoc language) throws JRException
52     {
53         String JavaDoc factoryClassName = JRProperties.getProperty(JRProperties.QUERY_EXECUTER_FACTORY_PREFIX + language);
54         if (factoryClassName == null)
55         {
56             throw new JRException("No query executer factory class registered for " + language + " queries. " +
57                     "Create a propery named " + JRProperties.QUERY_EXECUTER_FACTORY_PREFIX + language + ".");
58         }
59         
60         return (JRQueryExecuterFactory) cache.getCachedInstance(factoryClassName);
61     }
62 }
63
Popular Tags