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

   1 /*
   2  * This file is part of the LibreOffice project.
   3  *
   4  * This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   7  *
   8  * This file incorporates work covered by the following license notice:
   9  *
  10  *   Licensed to the Apache Software Foundation (ASF) under one or more
  11  *   contributor license agreements. See the NOTICE file distributed
  12  *   with this work for additional information regarding copyright
  13  *   ownership. The ASF licenses this file to you under the Apache
  14  *   License, Version 2.0 (the "License"); you may not use this file
  15  *   except in compliance with the License. You may obtain a copy of
  16  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  17  */
  18
  19 package com.sun.star.comp.connections;
  20
  21 import com.sun.star.connection.ConnectionSetupException;
  22 import com.sun.star.lang.XMultiServiceFactory;
  23 import com.sun.star.uno.UnoRuntime;
  24
  25 /**
  26  * Helper class for <code>Acceptor</code> and <code>Connector</code>.
  27  */
  28 final class Implementation {
  29     /**
  30      * Instantiate a service for a given connection type.
  31      *
  32      * @param factory the service factory used to instantiate the requested
  33      *     service.
  34      * @param description has the following format:
  35      *     <code><var>type</var></code><!--
  36      *         -->*(<code><var>key</var>=<var>value</var></code>).
  37      *     The specific service implementation is instantiated through the
  38      *     service factory as
  39      *     <code>com.sun.star.connection.<var>type</var>service<var></var><!--
  40      *         --></code>
  41      *     (with <code><var>type</var></code> in lower case, and
  42      *     <code><var>service</var></code> either <code>Acceptor</code> or
  43      *     <code>Connector</code>).</p>
  44      * @param serviceClass the IDL interface type for which to query the
  45      *     requested service.
  46      * @param serviceType must be either <code>Acceptor</code> or
  47      *     <code>Connector</code>.
  48      * @return an instance of the requested service.  Never returns
  49      *     <code>null</code>.
  50      * @throws ConnectionSetupException if the requested service can not be
  51      *     found, or cannot be instantiated.
  52      */
  53     public static Object getConnectionService(XMultiServiceFactory factory,
  54                                               String description,
  55                                               Class<?> serviceClass,
  56                                               String serviceType)
  57         throws ConnectionSetupException
  58     {
  59         int i = description.indexOf(',');
  60         String type
  61             = (i < 0 ? description : description.substring(0, i)).toLowerCase();
  62         Object service = null;
  63         try {
  64             service = UnoRuntime.queryInterface(
  65                 serviceClass,
  66                 factory.createInstance("com.sun.star.connection." + type
  67                                        + serviceType));
  68         } catch (RuntimeException e) {
  69             throw e;
  70         } catch (com.sun.star.uno.Exception e) {
  71         }
  72         if (service == null) {
  73             // As a fallback, also try to instantiate the service from the
  74             // com.sun.star.lib.connections package structure:
  75             try {
  76                 service
  77                     = Class.forName("com.sun.star.lib.connections." + type
  78                                     + "." + type + serviceType).newInstance();
  79             } catch (ClassNotFoundException e) {
  80             } catch (IllegalAccessException e) {
  81             } catch (InstantiationException e) {
  82             }
  83         }
  84         if (service == null) {
  85             throw new ConnectionSetupException("no " + serviceType + " for "
  86                                                + type);
  87         }
  88         return service;
  89     }
  90
  91     private Implementation() {} // do not instantiate
  92 }