package net.sourceforge.fenixedu.presentationTier.renderers;

import net.sourceforge.fenixedu.renderers.ValuesRenderer;
import net.sourceforge.fenixedu.renderers.layouts.Layout;
import net.sourceforge.fenixedu.renderers.model.MetaObject;
import net.sourceforge.fenixedu.renderers.model.MetaSlot;

public class NonNullValuesRenderer extends ValuesRenderer {

	@Override
	protected Layout getLayout(final Object object, Class type) {
		return new NonNullValuesLayout(getContext().getMetaObject());
	}

	class NonNullValuesLayout extends ValuesLayout {

		public NonNullValuesLayout(MetaObject metaObject) {
			super(metaObject);
		}

		@Override
		protected boolean hasMoreComponents() {
			for (int pos = this.index; pos < this.slots.size(); pos++) {
				MetaSlot slot = slots.get(pos);
				Object object = slot.getObject();
				
				if(object instanceof String) {
					String string = (String) object;
					object = (string.length()==0) ? null : object; 
				}
					
				if (object != null) {
					return true;
				}
			}

			return false;
		}

		@Override
		protected MetaSlot getNextSlot() {
			for (int pos = this.index; pos < this.slots.size(); pos++) {
				MetaSlot slot = slots.get(pos);
				Object object = slot.getObject();
		
				if(object instanceof String) {
					String string = (String) object;
					object = (string.length()==0) ? null : object; 
				}
		
				if (object != null) {
					this.index = pos + 1;
					return slot;
				}
			}
			
			return null;
		}
		
	}
}