KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > exolab > jms > config > ConnectorHelper


1 /**
2  * Redistribution and use of this software and associated documentation
3  * ("Software"), with or without modification, are permitted provided
4  * that the following conditions are met:
5  *
6  * 1. Redistributions of source code must retain copyright
7  * statements and notices. Redistributions must also contain a
8  * copy of this document.
9  *
10  * 2. Redistributions in binary form must reproduce the
11  * above copyright notice, this list of conditions and the
12  * following disclaimer in the documentation and/or other
13  * materials provided with the distribution.
14  *
15  * 3. The name "Exolab" must not be used to endorse or promote
16  * products derived from this Software without prior written
17  * permission of Exoffice Technologies. For written permission,
18  * please contact info@exolab.org.
19  *
20  * 4. Products derived from this Software may not be called "Exolab"
21  * nor may "Exolab" appear in their names without prior written
22  * permission of Exoffice Technologies. Exolab is a registered
23  * trademark of Exoffice Technologies.
24  *
25  * 5. Due credit should be given to the Exolab Project
26  * (http://www.exolab.org/).
27  *
28  * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
29  * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
30  * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
31  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
32  * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
33  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39  * OF THE POSSIBILITY OF SUCH DAMAGE.
40  *
41  * Copyright 2001-2003 (C) Exoffice Technologies Inc. All Rights Reserved.
42  *
43  * $Id: ConnectorHelper.java,v 1.1 2004/11/26 01:50:41 tanderson Exp $
44  */
45 package org.exolab.jms.config;
46
47 import java.io.IOException JavaDoc;
48 import java.io.InputStream JavaDoc;
49 import java.io.InputStreamReader JavaDoc;
50
51 import org.apache.commons.logging.Log;
52 import org.apache.commons.logging.LogFactory;
53
54 import org.exolab.jms.config.types.SchemeType;
55
56
57 /**
58  * ConnectorHelper is a utility class that returns {@link ConnectorResource}
59  * objects for a given scheme.
60  *
61  * @version $Revision: 1.1 $ $Date: 2004/11/26 01:50:41 $
62  * @author <a HREF="mailto:tima@intalio.com">Tim Anderson</a>
63  */
64 public class ConnectorHelper {
65
66     /**
67      * The default connector resource configurations
68      */
69     private static final ConnectorResource[] _connectors;
70
71     /**
72      * The logger
73      */
74     private static final Log _log = LogFactory.getLog(ConnectorHelper.class);
75
76     /**
77      * The connector configuration path as a resource
78      */
79     private static final String JavaDoc RESOURCE =
80         "/org/exolab/jms/config/connectors.xml";
81
82
83     /**
84      * Returns the connector resource for the supplied scheme.
85      * This uses the configuration returned by
86      * {@link ConfigurationManager#getConfig}
87      *
88      * @param scheme the connector scheme
89      * @return the connector configuration, or null if none exists
90      */
91     public static ConnectorResource getConnectorResource(SchemeType scheme) {
92         return getConnectorResource(scheme, ConfigurationManager.getConfig());
93     }
94
95     /**
96      * Returns the connector resource for the supplied scheme, from
97      * the supplied configuration. If the configuration doesn't define
98      * any connector resources, the default connector for the scheme will be
99      * returned.
100      *
101      * @param scheme the connector scheme
102      * @param config the configuration
103      * @return the connector configuration, or null if none exists
104      */
105     public static ConnectorResource getConnectorResource(
106         SchemeType scheme, Configuration config) {
107
108         if (scheme == null) {
109             throw new IllegalArgumentException JavaDoc("Argument 'scheme' is null");
110         }
111         if (config == null) {
112             throw new IllegalArgumentException JavaDoc("Argument 'config' is null");
113         }
114
115         ConnectorResource result = null;
116         ConnectorResource[] connectors = _connectors;
117         if (config.getConnectorResources() != null) {
118             // use the specified resources, if any
119 connectors = config.getConnectorResources().getConnectorResource();
120         }
121
122         String JavaDoc name = scheme.toString();
123         for (int i = 0; i < connectors.length; ++i) {
124             if (connectors[i].getScheme().toString().equals(name)) {
125                 result = connectors[i];
126                 break;
127             }
128         }
129         return result;
130     }
131
132     static {
133         // load the default connector resources
134
135         InputStream JavaDoc stream = null;
136         try {
137             ConnectorResources connectors = null;
138             stream = ConnectorHelper.class.getResourceAsStream(RESOURCE);
139             connectors = ConnectorResources.unmarshal(
140                 new InputStreamReader JavaDoc(stream));
141             _connectors = connectors.getConnectorResource();
142         } catch (Exception JavaDoc exception) {
143             _log.error(exception, exception);
144             throw new RuntimeException JavaDoc(exception.getMessage());
145         } finally {
146             if (stream != null) {
147                 try {
148                     stream.close();
149                 } catch (IOException JavaDoc ignore) {
150                 }
151             }
152         }
153     }
154
155 } //-- ConnectorHelper
156
Popular Tags