odk/examples/DevelopersGuide/OfficeDev/Linguistic/OneInstanceFactory.java

   1 /* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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  35
  36 import com.sun.star.lang.XSingleComponentFactory;
  37 import com.sun.star.lang.XServiceInfo;
  38 import com.sun.star.lang.XInitialization;
  39 import com.sun.star.beans.XPropertySet;
  40 import com.sun.star.uno.XComponentContext;
  41 import com.sun.star.uno.XInterface;
  42 import com.sun.star.uno.UnoRuntime;
  43
  44 import java.lang.reflect.Constructor;
  45
  46
  47 // purpose of this class is to provide a service factory that instantiates
  48 // the services only once (as long as this factory itself exists)
  49 // and returns only reference to that instance.
  50
  51
  52 public class OneInstanceFactory implements
  53         XSingleComponentFactory,
  54         XServiceInfo
  55 {
  56     private final Class    aMyClass;
  57     private final String   aSvcImplName;
  58     private final String[] aSupportedSvcNames;
  59     private XInterface     xInstantiatedService;
  60
  61     public OneInstanceFactory(
  62             Class       aMyClass,
  63             String      aSvcImplName,
  64             String[]    aSupportedSvcNames )
  65     {
  66         this.aMyClass           = aMyClass;
  67         this.aSvcImplName       = aSvcImplName;
  68         this.aSupportedSvcNames = aSupportedSvcNames;
  69         xInstantiatedService = null;
  70     }
  71
  72
  73     // XSingleComponentFactory
  74
  75     public Object createInstanceWithContext( XComponentContext context )
  76         throws com.sun.star.uno.Exception,
  77                com.sun.star.uno.RuntimeException
  78     {
  79         if (xInstantiatedService == null)
  80         {
  81             //!! the here used services all have exact one constructor!!
  82             Constructor [] aCtor = aMyClass.getConstructors();
  83             try {
  84                 xInstantiatedService = (XInterface) aCtor[0].newInstance( (Object[])null );
  85             }
  86             catch( Exception e ) {
  87             }
  88
  89             //!! workaround for services not always being created
  90             //!! via 'createInstanceWithArguments'
  91             XInitialization xIni = UnoRuntime.queryInterface(
  92                 XInitialization.class, createInstanceWithContext(context));
  93             if (xIni != null)
  94             {
  95                 Object[] aArguments = new Object[]{ null, null };
  96                 if (context != null)
  97                 {
  98                     XPropertySet xPropSet = UnoRuntime.queryInterface(
  99                         XPropertySet.class,
 100                         context.getServiceManager().createInstanceWithContext(
 101                             "com.sun.star.linguistic2.LinguProperties",
 102                             context ) );
 103                     aArguments[0] = xPropSet;
 104                 }
 105                 xIni.initialize( aArguments );
 106             }
 107         }
 108         return xInstantiatedService;
 109     }
 110
 111     public Object createInstanceWithArgumentsAndContext( Object[] aArguments, XComponentContext context )
 112         throws com.sun.star.uno.Exception,
 113                com.sun.star.uno.RuntimeException
 114     {
 115         if (xInstantiatedService == null)
 116         {
 117             XInitialization xIni = UnoRuntime.queryInterface(
 118                 XInitialization.class, createInstanceWithContext( context ));
 119             if (xIni != null)
 120                 xIni.initialize( aArguments );
 121         }
 122         return xInstantiatedService;
 123     }
 124
 125
 126
 127     // XServiceInfo
 128
 129     public boolean supportsService( String aServiceName )
 130         throws com.sun.star.uno.RuntimeException
 131     {
 132         boolean bFound = false;
 133         int nCnt = aSupportedSvcNames.length;
 134         for (int i = 0;  i < nCnt && !bFound;  ++i)
 135         {
 136             if (aServiceName.equals( aSupportedSvcNames[i] ))
 137                 bFound = true;
 138         }
 139         return bFound;
 140     }
 141
 142     public String getImplementationName()
 143         throws com.sun.star.uno.RuntimeException
 144     {
 145         return aSvcImplName;
 146     }
 147
 148     public String[] getSupportedServiceNames()
 149         throws com.sun.star.uno.RuntimeException
 150     {
 151         return aSupportedSvcNames;
 152     }
 153 }
 154
 155 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */