Bug 156469 Should not new a file that is not a *.properties on resource file
Desctiption: Should not create a file that is not a *.properties on resource file when the resource folder has not any other *.properties Step: 1.Set the resource folder path is blank. 2.New a report project. 3.New a report design. 4.Click the blank area on layout. 5.Select Property Editor - General - Resources 6.Click Add to add a resource file. 7.The browse resource file is pop up and select Resource Folder. 8.Input any word in text field. Excepted result: It prompt that the file name must end with .properties Actual result: Click OK and the file is create.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/resource/ResourceSelectionValidator.java
*            file extension to filter.
	 */
	public ResourceSelectionValidator( String[] ext )
	{
		this( false, false, ext );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.dialogs.ISelectionStatusValidator#validate(java.lang.Object[])
	 */
	public IStatus validate( Object[] selection )
	{
		int nSelected = selection.length;
		String pluginId = ReportPlugin.REPORT_UI;
		if ( nSelected == 0 || ( nSelected > 1 && multiSelect == false ) )
		{
			return EmptyStatus;
		}
		for ( int i = 0; i < selection.length; i++ )
		{
			Object curr = selection[i];
			if ( curr instanceof ResourceEntry )
			{
				ResourceEntry resource = (ResourceEntry) curr;
				if ( acceptFolders == false
						&& resource.getChildren( ).length > 0 )
				{
					return EmptyStatus;
				}