1 /*
2 * The Apache Software License, Version 1.1
3 *
4 * Copyright (c) 1999 The Apache Software Foundation. All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. The end-user documentation included with the redistribution, if
20 * any, must include the following acknowlegement:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowlegement may appear in the software itself,
24 * if and wherever such third-party acknowlegements normally appear.
25 *
26 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
27 * Foundation" must not be used to endorse or promote products derived
28 * from this software without prior written permission. For written
29 * permission, please contact apache@apache.org.
30 *
31 * 5. Products derived from this software may not be called "Apache"
32 * nor may "Apache" appear in their names without prior written
33 * permission of the Apache Group.
34 *
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>.
53 *
54 */
55 package org.apache.commons.jelly.tags.ojb;
56
57 import ojb.broker.PersistenceBroker;
58 import ojb.broker.PersistenceBrokerException;
59 import ojb.broker.PersistenceBrokerFactory;
60
61 import org.apache.commons.jelly.JellyContext;
62 import org.apache.commons.jelly.JellyException;
63 import org.apache.commons.jelly.TagSupport;
64 import org.apache.commons.jelly.XMLOutput;
65
66 /***
67 * <p>Tag handler for <Driver> in JSTL, used to create
68 * a simple DataSource for prototyping.</p>
69 *
70 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
71 * @version $Revision: 1.4 $
72 */
73 public class BrokerTag extends TagSupport {
74
75 /*** The variable name to export. */
76 private String var;
77
78 /*** The persistence broker instance */
79 private PersistenceBroker broker;
80
81 public BrokerTag() {
82 }
83
84
85 // Tag interface
86 //-------------------------------------------------------------------------
87 public void doTag(XMLOutput output) throws Exception {
88 if ( var == null ) {
89 var = "org.apache.commons.jelly.ojb.Broker";
90 }
91 if ( broker != null ) {
92 context.setVariable(var, broker);
93 invokeBody(output);
94 }
95 else {
96 broker = PersistenceBrokerFactory.createPersistenceBroker();
97 context.setVariable(var, broker);
98
99 try {
100 invokeBody(output);
101 }
102 finally {
103 broker.clearCache();
104 PersistenceBrokerFactory.releaseInstance(broker);
105 broker = null;
106 context.removeVariable(var);
107 }
108 }
109 }
110
111 // Properties
112 //-------------------------------------------------------------------------
113 /*** Sets the variable name to define for this expression
114 */
115 public void setVar(String var) {
116 this.var = var;
117 }
118
119 /*** @return the persistence broker instance */
120 public PersistenceBroker getBroker() {
121 return broker;
122 }
123
124 /*** Sets the persistence broker instance */
125 public void setBroker(PersistenceBroker broker) {
126 this.broker = broker;
127 }
128 }
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