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

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   3  *  $RCSfile: PropChgHelper.java,v $
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   5  *  $Revision: 1.3 $
   6  *
   7  *  last change: $Author: hr $ $Date: 2003-06-30 15:40:24 $
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  40
  41 import com.sun.star.linguistic2.XLinguServiceEventBroadcaster;
  42 import com.sun.star.linguistic2.XLinguServiceEventListener;
  43 import com.sun.star.linguistic2.LinguServiceEvent;
  44 import com.sun.star.beans.XPropertySet;
  45 import com.sun.star.beans.XPropertyChangeListener;
  46 import com.sun.star.beans.PropertyChangeEvent;
  47 import com.sun.star.lang.EventObject;
  48 import com.sun.star.uno.XInterface;
  49
  50 import java.util.ArrayList;
  51
  52 public class PropChgHelper implements
  53         XPropertyChangeListener,
  54         XLinguServiceEventBroadcaster
  55 {
  56     XInterface          xEvtSource;
  57     String[]            aPropNames;
  58     XPropertySet        xPropSet;
  59     ArrayList           aLngSvcEvtListeners;
  60
  61     public PropChgHelper(
  62             XInterface      xEvtSource,
  63             String[]        aPropNames )
  64     {
  65         this.xEvtSource = xEvtSource;
  66         this.aPropNames = aPropNames;
  67         xPropSet        = null;
  68         aLngSvcEvtListeners = new ArrayList();
  69     }
  70
  71     public XInterface GetEvtSource()
  72     {
  73         return xEvtSource;
  74     }
  75
  76     public XPropertySet GetPropSet()
  77     {
  78         return xPropSet;
  79     }
  80
  81     public String[] GetPropNames()
  82     {
  83         return aPropNames;
  84     }
  85
  86     public void LaunchEvent( LinguServiceEvent aEvt )
  87     {
  88         int nCnt = aLngSvcEvtListeners.size();
  89         for (int i = 0;  i < nCnt;  ++i)
  90         {
  91             XLinguServiceEventListener xLstnr =
  92                     (XLinguServiceEventListener) aLngSvcEvtListeners.get(i);
  93             if (xLstnr != null)
  94                 xLstnr.processLinguServiceEvent( aEvt );
  95         }
  96     }
  97
  98     public void AddAsListenerTo( XPropertySet xPropertySet )
  99     {
 100         // do not listen any longer to the old property set (if any)
 101         RemoveAsListener();
 102
 103         // set new property set to be used and register as listener to it
 104         xPropSet = xPropertySet;
 105         if (xPropSet != null)
 106         {
 107             int nLen = aPropNames.length;
 108             for (int i = 0;  i < nLen;  ++i)
 109             {
 110                 if (aPropNames[i].length() != 0)
 111                 {
 112                     try {
 113                         xPropSet.addPropertyChangeListener(
 114                                 aPropNames[i], (XPropertyChangeListener) this );
 115                     }
 116                     catch( Exception e ) {
 117                     }
 118                 }
 119             }
 120         }
 121     }
 122
 123     public void RemoveAsListener()
 124     {
 125         if (xPropSet != null)
 126         {
 127             int nLen = aPropNames.length;
 128             for (int i = 0;  i < nLen;  ++i)
 129             {
 130                 if (aPropNames[i].length() != 0)
 131                 {
 132                     try {
 133                         xPropSet.removePropertyChangeListener(
 134                                 aPropNames[i], (XPropertyChangeListener) this );
 135                     }
 136                     catch( Exception e ) {
 137                     }
 138                 }
 139             }
 140
 141             xPropSet = null;
 142         }
 143     }
 144
 145     // __________ interface methods __________
 146
 147     //***************
 148     // XEventListener
 149     //***************
 150     public void disposing( EventObject aSource )
 151             throws com.sun.star.uno.RuntimeException
 152     {
 153         if (aSource.Source == xPropSet)
 154         {
 155             RemoveAsListener();
 156         }
 157     }
 158
 159     //************************
 160     // XPropertyChangeListener
 161     //************************
 162     public void propertyChange( PropertyChangeEvent aEvt )
 163             throws com.sun.star.uno.RuntimeException
 164     {
 165         // will be overloaded in derived classes
 166     }
 167
 168     //******************************
 169     // XLinguServiceEventBroadcaster
 170     //******************************
 171     public boolean addLinguServiceEventListener(
 172             XLinguServiceEventListener xListener )
 173         throws com.sun.star.uno.RuntimeException
 174     {
 175         boolean bRes = false;
 176         if (xListener != null)
 177         {
 178             bRes = aLngSvcEvtListeners.add( xListener );
 179         }
 180         return bRes;
 181     }
 182
 183     public boolean removeLinguServiceEventListener(
 184             XLinguServiceEventListener xListener )
 185         throws com.sun.star.uno.RuntimeException
 186     {
 187         boolean bRes = false;
 188         if (xListener != null)
 189         {
 190             int nIdx = aLngSvcEvtListeners.indexOf( xListener );
 191             if (nIdx != -1)
 192             {
 193                 aLngSvcEvtListeners.remove( nIdx );
 194                 bRes = true;
 195             }
 196         }
 197         return bRes;
 198     }
 199 };
 200