TransportFactory


1   /*
2    * The source code contained herein is licensed under the IBM Public License
3    * Version 1.0, which has been approved by the Open Source Initiative.
4    * Copyright (C) 2001, International Business Machines Corporation
5    * All Rights Reserved.
6    *
7    */
8   
9   package org.uddi4j.transport;
10  
11  import java.util.Properties  ;
12  
13  /**
14   * Factory to dynamically create a Transport implementation.
15   *
16   * @author David Melgar (dmelgar@us.ibm.com)
17   */
18  public class TransportFactory {
19  
20     public static final String   PROPERTY_NAME =
21       "org.uddi4j.TransportClassName";
22  
23     public static final String   DEFAULT_TRANSPORT_NAME=
24        "org.uddi4j.transport.ApacheSOAPTransport";
25  
26     private Transport transport = null;
27     static private String   transportClassName  = null;
28  
29     Properties   config = null;
30  
31     /**
32      * Private constructor used by newInstance method.
33      * 
34      * @param p
35      */
36     private TransportFactory(Properties   p) {
37        config = p;
38     }
39  
40     /**
41      * Returns Transport implementation to be used.
42      * Transport is cached.
43      * Transport is dynamically loaded based on property
44      * org.uddi4j.transport.TransportClassName set as
45      * either a system property or in passed properties object.
46      * If this property is not set, the default transport
47      * is loaded.
48      *
49      * @return Transport
50      * @exception TransportException
51      *                   Thrown if transport class cannot be loaded.
52      */
53    public Transport getTransport() throws TransportException {
54  
55       if (transport==null) {
56          transportClassName = config.getProperty(PROPERTY_NAME, DEFAULT_TRANSPORT_NAME);
57          // Load and return the class
58          try {
59             transport = (Transport)Class.forName(transportClassName).newInstance();
60             if ("true".equals(config.getProperty("org.uddi4j.logEnabled"))) {
61                System.err.println("TransportFactory: Using transport name:" + transportClassName);
62             }
63          } catch (Exception   e) {
64             throw new TransportException(e);
65          }
66       }
67       return transport;
68     }
69  
70     /**
71      * Create a TransportFactory.
72      * 
73      * @return TransportFactory
74      */
75     static public TransportFactory newInstance() {
76        return new TransportFactory(System.getProperties());
77     }
78  
79     /**
80      * Create a TransportFactory passing in configuration information
81      * in a properties object.
82      * 
83      * @param p Properties
84      * @return TransportFactory
85      * @see org.uddi4j.client.UDDIProxy#UDDIProxy(Properties) UDDIProxy(Properties) constructor for information on configuration object.
86      */
87     static public TransportFactory newInstance(Properties   p) {
88        return new TransportFactory(p);
89     }
90  }
91
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