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package org.eclipse.swt.ole.win32;

import org.eclipse.swt.*;
import org.eclipse.swt.internal.ole.win32.*;


/**
 * @author S2267
 *
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
public class SinkObject {
    // supporting Event Sink attributes
    private OleEventSinkImpl[] oleEventSink = new OleEventSinkImpl[0];
    private GUID[] oleEventSinkGUID = new GUID[0];
    private int[] oleEventSinkIUnknown = new int[0];


    /**
     * 
     */
    public SinkObject() {
    }
   
    
    public void disconnectEventSinks() {

      for (int i = 0; i < oleEventSink.length; i++) {
        OleEventSinkImpl sink = oleEventSink[i];
        sink.disconnect();
        sink.Release();
      }
      oleEventSink = new OleEventSinkImpl[0];
      oleEventSinkGUID = new GUID[0];
      oleEventSinkIUnknown = new int[0];
    }
    
   /**
    * Adds the listener to receive events.
    *  
    * @param iunknown  the IUnknown of the automation object.
    * 
    * @param guid GUID of the source object that provides the event notification.
    * 
    * @param eventID the id of the event
    * 
    * @param listener the listener
    * 
    * @exception SWTError
    *  ERROR_NULL_ARGUMENT when listener is null
     */
    public  void addEventListener(int iunknown, GUID guid, int eventID, OleListener listener) {
      if (listener == null || iunknown == 0 || guid == null) OLE.error (SWT.ERROR_NULL_ARGUMENT);
      // have we connected to this kind of event sink before?
      int index = -1;
      for (int i = 0; i < oleEventSinkGUID.length; i++) {
        if (COM.IsEqualGUID(oleEventSinkGUID[i], guid)) {
          if (iunknown == oleEventSinkIUnknown[i]) {
            index = i;
            break;
          }
        }
      }
      if (index != -1) {
        oleEventSink[index].addListener(eventID, listener);
      } else {
        int oldLength = oleEventSink.length;
        OleEventSinkImpl[] newOleEventSink = new OleEventSinkImpl[oldLength + 1];
        GUID[] newOleEventSinkGUID = new GUID[oldLength + 1];
        int[] newOleEventSinkIUnknown = new int[oldLength + 1];
        System.arraycopy(oleEventSink, 0, newOleEventSink, 0, oldLength);
        System.arraycopy(oleEventSinkGUID, 0, newOleEventSinkGUID, 0, oldLength);
        System.arraycopy(oleEventSinkIUnknown, 0, newOleEventSinkIUnknown, 0, oldLength);
        oleEventSink = newOleEventSink;
        oleEventSinkGUID = newOleEventSinkGUID;
        oleEventSinkIUnknown = newOleEventSinkIUnknown;

        oleEventSink[oldLength] = new OleEventSinkImpl(iunknown, guid);
        oleEventSinkGUID[oldLength] = guid;
        oleEventSinkIUnknown[oldLength] = iunknown;
        oleEventSink[oldLength].AddRef();
        oleEventSink[oldLength].connect();
        oleEventSink[oldLength].addListener(eventID, listener);


      }
    }
    /**  
     * Removes the listener.
     *
     * @param eventID the event identifier
     * 
     * @param listener the listener
     *
     * @exception SWTError
     *  ERROR_NULL_ARGUMENT when listener is null
     */
    void removeEventListener(int iunknown, GUID guid, int eventID, OleListener listener) {
      if (listener == null || guid == null) throw new SWTError (SWT.ERROR_NULL_ARGUMENT);
      for (int i = 0; i < oleEventSink.length; i++) {
        if (COM.IsEqualGUID(oleEventSinkGUID[i], guid)) {
          if (iunknown == oleEventSinkIUnknown[i]) {
            oleEventSink[i].removeListener(eventID, listener);
            if (!oleEventSink[i].hasListeners()) {
              //free resources associated with event sink
              oleEventSink[i].disconnect();
              oleEventSink[i].Release();
              int oldLength = oleEventSink.length;
              if (oldLength == 1) {
                oleEventSink = new OleEventSinkImpl[0];
                oleEventSinkGUID = new GUID[0];
                oleEventSinkIUnknown = new int[0];
              } else {
                OleEventSinkImpl[] newOleEventSink = new OleEventSinkImpl[oldLength - 1];
                System.arraycopy(oleEventSink, 0, newOleEventSink, 0, i);
                System.arraycopy(oleEventSink, i + 1, newOleEventSink, i, oldLength - i - 1);
                oleEventSink = newOleEventSink;

                GUID[] newOleEventSinkGUID = new GUID[oldLength - 1];
                System.arraycopy(oleEventSinkGUID, 0, newOleEventSinkGUID, 0, i);
                System.arraycopy(oleEventSinkGUID, i + 1, newOleEventSinkGUID, i, oldLength - i - 1);
                oleEventSinkGUID = newOleEventSinkGUID;

                int[] newOleEventSinkIUnknown = new int[oldLength - 1];
                System.arraycopy(oleEventSinkIUnknown, 0, newOleEventSinkIUnknown, 0, i);
                System.arraycopy(oleEventSinkIUnknown, i + 1, newOleEventSinkIUnknown, i, oldLength - i - 1);
                oleEventSinkIUnknown = newOleEventSinkIUnknown;
              }
            }
            return;
          }
        }
      }
    }
    
    
    
    

}