jurt/com/sun/star/comp/connections/Implementation.java

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  30
  31 package com.sun.star.comp.connections;
  32
  33 import com.sun.star.connection.ConnectionSetupException;
  34 import com.sun.star.lang.XMultiServiceFactory;
  35 import com.sun.star.uno.UnoRuntime;
  36
  37 /**
  38  * Helper class for <code>Acceptor</code> and <code>Connector</code>.
  39  */
  40 final class Implementation {
  41     /**
  42      * Instantiate a service for a given connection type.
  43      *
  44      * @param factory the service factory used to instantiate the requested
  45      *     service.
  46      * @param description has the following format:
  47      *     <code><var>type</var></code><!--
  48      *         -->*(<code><var>key</var>=<var>value</var></code>).
  49      *     The specific service implementation is instantiated through the
  50      *     service factory as
  51      *     <code>com.sun.star.connection.<var>type</var>service<var></var><!--
  52      *         --></code>
  53      *     (with <code><var>type</var></code> in lower case, and
  54      *     <code><var>service</var></code> either <code>Acceptor</code> or
  55      *     <code>Connector</code>).</p>
  56      * @param serviceClass the IDL interface type for which to query the
  57      *     requested service.
  58      * @param serviceType must be either <code>Acceptor</code> or
  59      *     <code>Connector</code>.
  60      * @return an instance of the requested service.  Never returns
  61      *     <code>null</code>.
  62      * @throws ConnectionSetupException if the requested service can not be
  63      *     found, or cannot be instantiated.
  64      */
  65     public static Object getConnectionService(XMultiServiceFactory factory,
  66                                               String description,
  67                                               Class serviceClass,
  68                                               String serviceType)
  69         throws ConnectionSetupException
  70     {
  71         int i = description.indexOf(',');
  72         String type
  73             = (i < 0 ? description : description.substring(0, i)).toLowerCase();
  74         Object service = null;
  75         try {
  76             service = UnoRuntime.queryInterface(
  77                 serviceClass,
  78                 factory.createInstance("com.sun.star.connection." + type
  79                                        + serviceType));
  80         } catch (RuntimeException e) {
  81             throw e;
  82         } catch (com.sun.star.uno.Exception e) {
  83         }
  84         if (service == null) {
  85             // As a fallback, also try to instantiate the service from the
  86             // com.sun.star.lib.connections package structure:
  87             try {
  88                 service
  89                     = Class.forName("com.sun.star.lib.connections." + type
  90                                     + "." + type + serviceType).newInstance();
  91             } catch (ClassNotFoundException e) {
  92             } catch (IllegalAccessException e) {
  93             } catch (InstantiationException e) {
  94             }
  95         }
  96         if (service == null) {
  97             throw new ConnectionSetupException("no " + serviceType + " for "
  98                                                + type);
  99         }
 100         return service;
 101     }
 102
 103     private Implementation() {} // do not instantiate
 104 }