Package org.topbraid.shacl.expr.lib

Class DistinctExpression

  • All Implemented Interfaces:
    NodeExpression
    public class DistinctExpression
extends AbstractInputExpression
    Implements support for sh:distinct. This node expression type is not part of the SHACL-AF 1.0 document, but a candidate for 1.1.
    Author:
    Holger Knublauch

    • Constructor Detail

      • DistinctExpression

        public DistinctExpression​(org.apache.jena.rdf.model.RDFNode expr,
                          NodeExpression input)

    • Method Detail

      • eval

        public org.apache.jena.util.iterator.ExtendedIterator<org.apache.jena.rdf.model.RDFNode> eval​(org.apache.jena.rdf.model.RDFNode focusNode,
                                                                                              NodeExpressionContext context)
        Description copied from interface: NodeExpression
        Produces an iterator of value nodes for a given focus node.
        Parameters:
        focusNode - the focus node
        context - the context
        Returns:
        an iterator (never null)

      • getOutputShape

        public org.apache.jena.rdf.model.Resource getOutputShape​(org.apache.jena.rdf.model.Resource contextShape)
        Description copied from interface: NodeExpression
        Gets the shape of the output data (if known), based on a context shape. For example, for a path expression it would try to infer the output shape from the sh:class or sh:node of the property (path).
        Specified by:
        getOutputShape in interface NodeExpression
        Overrides:
        getOutputShape in class AbstractNodeExpression
        Parameters:
        contextShape - the shape where the evaluation would start, e.g. the node shape of the sh:values statement
        Returns:
        an output shape or null if unknown

      • getTypeId

        public String getTypeId()

      • distinct

        public static org.apache.jena.util.iterator.ExtendedIterator<org.apache.jena.rdf.model.RDFNode> distinct​(org.apache.jena.util.iterator.ExtendedIterator<org.apache.jena.rdf.model.RDFNode> base)
        Produces an RDFNode iterator that drops duplicate values, based on a Set.
        Parameters:
        base - the iterator to wrap
        Returns:
        a distinct iterator