src/main/java/org/efaps/ui/wicket/models/field/factories/DateUIFactory.java
@Override
    public Comparable<?> getCompareValue(final AbstractUIField _uiField)
        throws EFapsException
    {
        Comparable<?> ret = (Comparable<?>) _uiField.getValue().getReadOnlyValue(_uiField.getParent().getMode());
        if (ret instanceof String && StringUtils.isEmpty((String) ret)) {
            ret = null;
        }
        return ret;
    }
@Override
    public Comparable<?> getCompareValue(final AbstractUIField _uiField)
        throws EFapsException
    {
        Comparable<?> ret = (Comparable<?>) _uiField.getValue().getReadOnlyValue(_uiField.getParent().getMode());
        if (ret instanceof String && StringUtils.isEmpty((String) ret)) {
            ret = null;
        }
        return ret;
    }
@ Override public Comparable < ? > getCompareValue ( final AbstractUIField _uiField ) throws EFapsException { Comparable < ? > ret = ( Comparable < ? > ) _uiField . getValue ( ) . getReadOnlyValue ( _uiField . getParent ( ) . getMode ( ) ) ; if ( ret instanceof String && StringUtils . isEmpty ( ( String ) ret ) ) { ret = null ; } return ret ; }
{@inheritDoc}
{