odk/examples/DevelopersGuide/OfficeDev/Linguistic/PropChgHelper.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.linguistic2.XLinguServiceEventBroadcaster;
  37 import com.sun.star.linguistic2.XLinguServiceEventListener;
  38 import com.sun.star.linguistic2.LinguServiceEvent;
  39 import com.sun.star.beans.XPropertySet;
  40 import com.sun.star.beans.XPropertyChangeListener;
  41 import com.sun.star.beans.PropertyChangeEvent;
  42 import com.sun.star.lang.EventObject;
  43 import com.sun.star.uno.XInterface;
  44
  45 import java.util.ArrayList;
  46
  47 public class PropChgHelper implements
  48         XPropertyChangeListener,
  49         XLinguServiceEventBroadcaster
  50 {
  51     private final XInterface          xEvtSource;
  52     private final String[]      aPropNames;
  53     private XPropertySet        xPropSet;
  54     private final ArrayList<XLinguServiceEventListener> aLngSvcEvtListeners;
  55
  56     public PropChgHelper(
  57             XInterface      xEvtSource,
  58             String[]        aPropNames )
  59     {
  60         this.xEvtSource = xEvtSource;
  61         this.aPropNames = aPropNames;
  62         xPropSet        = null;
  63         aLngSvcEvtListeners = new ArrayList<XLinguServiceEventListener>();
  64     }
  65
  66     public XInterface GetEvtSource()
  67     {
  68         return xEvtSource;
  69     }
  70
  71     public XPropertySet GetPropSet()
  72     {
  73         return xPropSet;
  74     }
  75
  76
  77
  78     public void LaunchEvent( LinguServiceEvent aEvt )
  79     {
  80         int nCnt = aLngSvcEvtListeners.size();
  81         for (int i = 0;  i < nCnt;  ++i)
  82         {
  83             XLinguServiceEventListener xLstnr =
  84                     aLngSvcEvtListeners.get(i);
  85             if (xLstnr != null)
  86                 xLstnr.processLinguServiceEvent( aEvt );
  87         }
  88     }
  89
  90     public void AddAsListenerTo( XPropertySet xPropertySet )
  91     {
  92         // do not listen any longer to the old property set (if any)
  93         RemoveAsListener();
  94
  95         // set new property set to be used and register as listener to it
  96         xPropSet = xPropertySet;
  97         if (xPropSet != null)
  98         {
  99             int nLen = aPropNames.length;
 100             for (int i = 0;  i < nLen;  ++i)
 101             {
 102                 if (aPropNames[i].length() != 0)
 103                 {
 104                     try {
 105                         xPropSet.addPropertyChangeListener(
 106                                 aPropNames[i], this );
 107                     }
 108                     catch( Exception e ) {
 109                     }
 110                 }
 111             }
 112         }
 113     }
 114
 115     private void RemoveAsListener()
 116     {
 117         if (xPropSet != null)
 118         {
 119             int nLen = aPropNames.length;
 120             for (int i = 0;  i < nLen;  ++i)
 121             {
 122                 if (aPropNames[i].length() != 0)
 123                 {
 124                     try {
 125                         xPropSet.removePropertyChangeListener(
 126                                 aPropNames[i], this );
 127                     }
 128                     catch( Exception e ) {
 129                     }
 130                 }
 131             }
 132
 133             xPropSet = null;
 134         }
 135     }
 136
 137     // __________ interface methods __________
 138
 139
 140     // XEventListener
 141
 142     public void disposing( EventObject aSource )
 143             throws com.sun.star.uno.RuntimeException
 144     {
 145         if (aSource.Source == xPropSet)
 146         {
 147             RemoveAsListener();
 148         }
 149     }
 150
 151
 152     // XPropertyChangeListener
 153
 154     public void propertyChange( PropertyChangeEvent aEvt )
 155             throws com.sun.star.uno.RuntimeException
 156     {
 157         // will be overridden in derived classes
 158     }
 159
 160
 161     // XLinguServiceEventBroadcaster
 162
 163     public boolean addLinguServiceEventListener(
 164             XLinguServiceEventListener xListener )
 165         throws com.sun.star.uno.RuntimeException
 166     {
 167         boolean bRes = false;
 168         if (xListener != null)
 169         {
 170             bRes = aLngSvcEvtListeners.add( xListener );
 171         }
 172         return bRes;
 173     }
 174
 175     public boolean removeLinguServiceEventListener(
 176             XLinguServiceEventListener xListener )
 177         throws com.sun.star.uno.RuntimeException
 178     {
 179         boolean bRes = false;
 180         if (xListener != null)
 181         {
 182             int nIdx = aLngSvcEvtListeners.indexOf( xListener );
 183             if (nIdx != -1)
 184             {
 185                 aLngSvcEvtListeners.remove( nIdx );
 186                 bRes = true;
 187             }
 188         }
 189         return bRes;
 190     }
 191 }
 192
 193 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */