Class IsNilImpl

  • All Implemented Interfaces:
    Filter, MultiValuedFilter, PropertyIsNil, FilterType

    public class IsNilImpl
    extends CompareFilterImpl
    implements PropertyIsNil
    JD: PropertyIsNil requires us to return true if a property is "nil" in the xml schema sense. But we don't really have notion of schema in our filters. So for now we just make it an alias of PropertyIsNull. When someone (app-schema) has a need for this we can revisit.
    • Method Detail

      • evaluate

        public boolean evaluate​(Object object)
        Description copied from interface: Filter
        Give an object, this method determines if the test(s) represented by this filter object are passed.

        This ability is used to allow Queries against both Features and and non spatial data (such as Record) and to express constraints on permissable data values.

        Specified by:
        evaluate in interface Filter
        true if the test(s) are passed for the provided object
      • accept

        public Object accept​(FilterVisitor visitor,
                             Object extraData)
        Description copied from class: CompareFilterImpl
        Used by FilterVisitors to perform some action on this filter instance. Typicaly used by Filter decoders, but may also be used by any thing which needs infomration from filter structure. Implementations should always call: visitor.visit(this); It is importatant that this is not left to a parent class unless the parents API is identical.
        Specified by:
        accept in interface Filter
        Specified by:
        accept in class CompareFilterImpl
        visitor - The visitor which requires access to this filter, the method must call visitor.visit(this);