/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2001 Intersect Software Corporation

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/

package net.wotonomy.ui;

import java.util.List;

import net.wotonomy.control.EODataSource;
import net.wotonomy.foundation.NSArray;
import net.wotonomy.foundation.NSNotification;

    /**
    * A convenience class for creating display group delegates.
    * All methods of the delegate interface are implemented
    * to do nothing.
    *
    * @author michael@mpowers.net
    * @author $Author: cgruber $
    * @version $Revision: 904 $
    */
    public class DelegateAdapter implements EODisplayGroup.Delegate
    {
        /**
        * Called when the specified data source fails
        * to create an object for the specified display group.
        */
		public void displayGroupCreateObjectFailed ( 
			EODisplayGroup aDisplayGroup,
			EODataSource aDataSource )
        {
                        
        }

        /**
		* Called after the specified display group's
		* data source is changed.
		*/
		public void displayGroupDidChangeDataSource ( 
			EODisplayGroup aDisplayGroup )
        {
                        
        }

		/**
		* Called after the specified display group's
		* selection has changed.
		*/
		public void displayGroupDidChangeSelectedObjects ( 
			EODisplayGroup aDisplayGroup )
        {
                        
        }

		/**
		* Called after the specified display group's
		* selection has changed.
		*/
		public void displayGroupDidChangeSelection ( 
			EODisplayGroup aDisplayGroup )
        {
                        
        }

		/**
		* Called after the specified object display group's
		* selection has changed.
		*/
		public void displayGroupDidDeleteObject ( 
			EODisplayGroup aDisplayGroup,
			Object anObject )
        {
                        
        }

		/**
		* Called after the specified display group
		* has fetched the specified object list.
		*/
		public void displayGroupDidFetchObjects ( 
			EODisplayGroup aDisplayGroup,
			List anObjectList )
        {
                        
        }

		/**
		* Called after the specified display group
		* has inserted the specified object into
		* its internal object list.
		*/
		public void displayGroupDidInsertObject ( 
			EODisplayGroup aDisplayGroup,
			Object anObject )
        {
                        
        }

		/**
		* Called after the specified display group
		* has set the specified value for the specified
		* object and key.
		*/
		public void displayGroupDidSetValueForObject ( 
			EODisplayGroup aDisplayGroup,
			Object aValue,
			Object anObject,
			String aKey )
        {
                        
        }

		/**
		* Called by the specified display group to
		* determine what objects should be displayed
		* for the objects in the specified list.
		* @return An NSArray containing the objects
		* to be displayed for the objects in the 
		* specified list.
		*/
		public NSArray displayGroupDisplayArrayForObjects ( 
			EODisplayGroup aDisplayGroup,
			List aList )
        {
            return new NSArray( aList );                
        }

		/**
		* Called by the specified display group before
		* it attempts to change the selection.
        * This implementation returns true.
		* @return True to allow the selection to change,
		* false otherwise.
		*/
		public boolean displayGroupShouldChangeSelection ( 
			EODisplayGroup aDisplayGroup,
			List aSelectionList )
        {
            return true;
        }

		/**
		* Called by the specified display group before
		* it attempts to delete the specified object.
        * This implementation returns true.
		* @return True to allow the object to be deleted
		* false to prevent the deletion.
		*/
		public boolean displayGroupShouldDeleteObject ( 
			EODisplayGroup aDisplayGroup,
			Object anObject )
        {
            return true;
        }

		/**
		* Called by the specified display group before
		* it attempts display the specified alert to
		* the user.
        * This implementation returns true.
		* @return True to allow the message to be 
		* displayed, false if you want to handle the
		* alert yourself and suppress the display group's
		* notification.
		*/
		public boolean displayGroupShouldDisplayAlert ( 
			EODisplayGroup aDisplayGroup,
			String aTitle,
			String aMessage )
        {
            return true;
        }

		/**
		* Called by the specified display group before
		* it attempts fetch objects.
        * This implementation returns true.
		* @return True to allow the fetch to take place,
		* false to prevent the fetch.
		*/
		public boolean displayGroupShouldFetch ( 
			EODisplayGroup aDisplayGroup )
        {
            return true;
        }

		/**
		* Called by the specified display group before
		* it attempts to insert the specified object.
        * This implementation returns true.
		* @return True to allow the object to be inserted
		* false to prevent the insertion.
		*/
		public boolean displayGroupShouldInsertObject ( 
			EODisplayGroup aDisplayGroup,
			Object anObject,
			int anIndex )
        {
            return true;
        }

		/**
		* No idea what this might indicate,
		* nor what the notification indicates.
        * This implementation returns true.
		*/
		public boolean displayGroupShouldRedisplay ( 
			EODisplayGroup aDisplayGroup,
			NSNotification aNotification )
        {
            return true;
        }

		/**
		* No idea what this might indicate,
		* nor what the notification indicates.
		*/
		public boolean displayGroupShouldRefetch ( 
			EODisplayGroup aDisplayGroup,
			NSNotification aNotification )
        {
            return true;
        }
        
    }

/*
 * $Log$
 * Revision 1.2  2006/02/18 23:14:35  cgruber
 * Update imports and maven dependencies.
 *
 * Revision 1.1  2006/02/16 13:22:22  cgruber
 * Check in all sources in eclipse-friendly maven-enabled packages.
 *
 * Revision 1.2  2003/08/06 23:07:52  chochos
 * general code cleanup (mostly, removing unused imports)
 *
 * Revision 1.1  2001/01/24 14:23:17  mpowers
 * Contributing DelegateAdapter.
 *
 *
 */