package org.argeo.people.ui.providers;
   
   import org.eclipse.jface.viewers.ILazyContentProvider;
   import org.eclipse.jface.viewers.TableViewer;
   import org.eclipse.jface.viewers.Viewer;
   
   /**
    * Canonical implementation of a LazyContentProvider that manage array of
    * objects
   */
  public class SimpleLazyContentProvider implements ILazyContentProvider {
  	private static final long serialVersionUID = 1L;
  	private TableViewer viewer;
  
  	Object[] elements;
  
  	public SimpleLazyContentProvider(TableViewer viewer) {
  		this.viewer = viewer;
  	}
  
  	public void dispose() {
  	}
  
  	public void setElements(Object[] elements) {
  		this.elements = elements;
  		viewer.setInput(elements);
  		viewer.setItemCount(elements == null ? 0 : elements.length);
  	}
  
  	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
  		// IMPORTANT: don't forget this: an exception will be thrown if a
  		// selected object is not part of the results anymore.
  		viewer.setSelection(null);
  		elements = (Object[]) newInput;
  	}
  
  	public void updateElement(int index) {
  		viewer.replace(elements[index], index);
  	}
  }