How to use

isEmpty

method

in

org.drools.guvnor.models.commons.shared.rule.ExpressionFormLine

private Widget getWidgetForCurrentType() {
  if ( expression.isEmpty() ) {
    return createStartPointWidget();
  }
  ChangeHandler ch = new ChangeHandler() {
    public void onChange( ChangeEvent event ) {
      ListBox box = (ListBox) event.getSource();
      panel.remove( box );
      if ( box.getSelectedIndex() > 0 ) {
        onChangeSelection( box.getValue( box.getSelectedIndex() ) );
      }
    }
  };
  ListBox lb = new ListBox();
  lb.setVisibleItemCount( 1 );
  lb.addItem( Constants.INSTANCE.ChooseDotDotDot(),
        "" );
  lb.addItem( "<==" + Constants.INSTANCE.DeleteItem(),
        DELETE_VALUE );
  for ( Map.Entry<String, String> entry : getCompletionsForCurrentType( expression.getParts().size() > 1 ).entrySet() ) {
    lb.addItem( entry.getKey(),
          entry.getValue() );
  }
  lb.addChangeHandler( ch );
  return lb;
}

this.expression = expression;
if ( this.expression.isEmpty() ) {
  this.isFactTypeKnown = true;
} else {
if ( expression == null || expression.isEmpty() ) {
  if ( this.readOnly ) {
    panel.add( new SmallLabel( "<b>-</b>" ) );

if ( !expression.isEmpty() ) {
  panel.add( createWidgetForExpression( expression.getText() + "." ) );

if ( !expression.isEmpty() ) {
  panel.add( createWidgetForExpression( expression.getText() + "." ) );