org.topbraid.shacl.expr.lib

Class DistinctExpression

java.lang.Object

org.topbraid.shacl.expr.AbstractNodeExpression

org.topbraid.shacl.expr.ComplexNodeExpression

org.topbraid.shacl.expr.AbstractInputExpression

org.topbraid.shacl.expr.lib.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 Summary

Constructors

Constructor and Description
DistinctExpression(org.apache.jena.rdf.model.RDFNode expr, NodeExpression input)

Method Summary

Modifier and Type	Method and Description
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.
org.apache.jena.util.iterator.ExtendedIterator<org.apache.jena.rdf.model.RDFNode>	eval(org.apache.jena.rdf.model.RDFNode focusNode, NodeExpressionContext context) Produces an iterator of value nodes for a given focus node.
org.apache.jena.rdf.model.Resource	getOutputShape(org.apache.jena.rdf.model.Resource contextShape) Gets the shape of the output data (if known), based on a context shape.
String	getTypeId()
void	visit(NodeExpressionVisitor visitor)

Methods inherited from class org.topbraid.shacl.expr.AbstractInputExpression

evalInput, getFunctionalSyntaxArguments, getInput, getInputExpressions

Methods inherited from class org.topbraid.shacl.expr.ComplexNodeExpression

getFunctionalSyntax, getFunctionalSyntaxName

Methods inherited from class org.topbraid.shacl.expr.AbstractNodeExpression

evalReverse, getRDFNode, isReversible, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

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

visit

public void visit(NodeExpressionVisitor visitor)