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

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   3  *  $RCSfile: OneInstanceFactory.java,v $
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   5  *  $Revision: 1.4 $
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   7  *  last change: $Author: rt $ $Date: 2005-01-31 16:47:36 $
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  40
  41 import com.sun.star.lang.XSingleServiceFactory;
  42 import com.sun.star.lang.XServiceInfo;
  43 import com.sun.star.lang.XInitialization;
  44 import com.sun.star.lang.XMultiServiceFactory;
  45 import com.sun.star.beans.XPropertySet;
  46 import com.sun.star.uno.XInterface;
  47 import com.sun.star.uno.Any;
  48 import com.sun.star.uno.UnoRuntime;
  49
  50 import java.lang.reflect.Constructor;
  51
  52 //
  53 // purpose of this class is to provide a service factory that instantiates
  54 // the services only once (as long as this factory itself exists)
  55 // and returns only reference to that instance.
  56 //
  57
  58 public class OneInstanceFactory implements
  59         XSingleServiceFactory,
  60         XServiceInfo
  61 {
  62     Class       aMyClass;
  63     String      aSvcImplName;
  64     String[]    aSupportedSvcNames;
  65     XInterface  xInstantiatedService;
  66     XMultiServiceFactory    xMultiFactory;
  67
  68     public OneInstanceFactory(
  69             Class       aMyClass,
  70             String      aSvcImplName,
  71             String[]    aSupportedSvcNames,
  72             XMultiServiceFactory    xMultiFactory )
  73     {
  74         this.aMyClass           = aMyClass;
  75         this.aSvcImplName       = aSvcImplName;
  76         this.aSupportedSvcNames = aSupportedSvcNames;
  77         this.xMultiFactory      = xMultiFactory;
  78         xInstantiatedService = null;
  79     }
  80
  81     //**********************
  82     // XSingleServiceFactory
  83     //**********************
  84     public Object createInstance()
  85         throws com.sun.star.uno.Exception,
  86                com.sun.star.uno.RuntimeException
  87     {
  88         if (xInstantiatedService == null)
  89         {
  90             //!! the here used services all have exact one constructor!!
  91             Constructor [] aCtor = aMyClass.getConstructors();
  92             try {
  93                 xInstantiatedService = (XInterface) aCtor[0].newInstance( (Object[])null );
  94             }
  95             catch( Exception e ) {
  96             }
  97
  98             //!! workaround for services not always being created
  99             //!! via 'createInstanceWithArguments'
 100             XInitialization xIni = (XInitialization) UnoRuntime.queryInterface(
 101                 XInitialization.class, createInstance());
 102             if (xIni != null)
 103             {
 104                 Object[] aArguments = new Object[]{ null, null };
 105                 if (xMultiFactory != null)
 106                 {
 107                     XPropertySet xPropSet = (XPropertySet) UnoRuntime.queryInterface(
 108                         XPropertySet.class ,  xMultiFactory.createInstance(
 109                             "com.sun.star.linguistic2.LinguProperties" ) );
 110                     aArguments[0] = xPropSet;
 111                 }
 112                 xIni.initialize( aArguments );
 113             }
 114         }
 115         return xInstantiatedService;
 116     }
 117
 118     public Object createInstanceWithArguments( Object[] aArguments )
 119         throws com.sun.star.uno.Exception,
 120                com.sun.star.uno.RuntimeException
 121     {
 122         if (xInstantiatedService == null)
 123         {
 124             XInitialization xIni = (XInitialization) UnoRuntime.queryInterface(
 125                 XInitialization.class, createInstance());
 126             if (xIni != null)
 127                 xIni.initialize( aArguments );
 128         }
 129         return xInstantiatedService;
 130     }
 131
 132
 133     //*************
 134     // XServiceInfo
 135     //*************
 136     public boolean supportsService( String aServiceName )
 137         throws com.sun.star.uno.RuntimeException
 138     {
 139         boolean bFound = false;
 140         int nCnt = aSupportedSvcNames.length;
 141         for (int i = 0;  i < nCnt && !bFound;  ++i)
 142         {
 143             if (aServiceName.equals( aSupportedSvcNames[i] ))
 144                 bFound = true;
 145         }
 146         return bFound;
 147     }
 148
 149     public String getImplementationName()
 150         throws com.sun.star.uno.RuntimeException
 151     {
 152         return aSvcImplName;
 153     }
 154
 155     public String[] getSupportedServiceNames()
 156         throws com.sun.star.uno.RuntimeException
 157     {
 158         return aSupportedSvcNames;
 159     }
 160 };
 161