Bug 79957 [Viewers] NPE changing input usingTableViewer and virtual
I'm using the latest code for Table viewer with a private virtual manager class in table viewer. i've straight forward code ... <code> Table table=new Table(shell,SWT.VIRTUAL); TableViewer tv=new TableViewer(table); tv.setContentProvider(new NetworkContentProvider()); tv.setLabelProvider(new NetworkLabelProvider()); tv.setInput(model); . . . in a selection event handler for a button, i've to reset the model input . . tv.setInput(model1); . . Same code works fine without the SWT.VIRTUAL style bit,but when VIRTUAL is set it throws a null pointer exception... the stack trace was java.lang.NullPointerException at org.eclipse.jface.viewers.TableViewer$1.handleEvent(TableViewer.java:103) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:796) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:820) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:805) at org.eclipse.swt.widgets.Table.wmNotifyChild(Table.java:3158) at org.eclipse.swt.widgets.Control.WM_NOTIFY(Control.java:4040) at org.eclipse.swt.widgets.Composite.WM_NOTIFY(Composite.java:722) at org.eclipse.swt.widgets.Control.windowProc(Control.java:3025) at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1400) at org.eclipse.swt.widgets.Display.windowProc(Display.java:3349) at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:1403) at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:137) at org.eclipse.swt.widgets.Control.windowProc(Control.java:3056) at org.eclipse.swt.widgets.Display.windowProc(Display.java:3349) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1479) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2440) at jface.viewers.TestJfaceVirtual.main(TestJfaceVirtual.java:49)
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
*/
public class TableViewer extends StructuredViewer {
	
	private class VirtualManager{
		
		private int currentVisibleIndex = -1;
		private Hashtable virtualElements = new Hashtable();
		
		public VirtualManager(){
			addTableListener();
		}
		
		/**
		 * Return whether or not index is visible.
		 * @return <code>true</code> if the item has already
		 * been created.
		 */
		public boolean isVisible(int index) {
			return index <= currentVisibleIndex;
		}
		
		
		/**
		 * Add the listener for SetData on he table
		 * @param virtualTable - the table to listen to
		 */
		private void addTableListener() {
			table.addListener(SWT.SetData,new Listener(){
				/* (non-Javadoc)
				 * @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event)