Package org.eclipse.rdf4j.query.algebra
package org.eclipse.rdf4j.query.algebra
Abstract Query Algebra model.
The root of the query algebra hierarchy is
QueryModelNode.-
ClassDescriptionBase class for shared functionality of aggregate operators (e.g.Base implementation of
QueryModelNode.CustomAggregateOperatorfunction call that can be defined to take an argument and can apply distinct filtering on it.An operator that returns aggregates values.A boolean AND operator operating on two boolean expressions.A tuple expression that matches a path of arbitrary length against an RDF graph.The AVG operator as defined in http://www.w3.org/TR/sparql11-query/#aggregates.An abstract superclass for binary tuple operators which, by definition, has two arguments.An abstract superclass for binary value operators which, by definition, has two arguments.A BNode generator, which generates a new BNode each time it needs to supply a value.The BOUND function, as defined in SPARQL Query Language for RDF; checks if a variable is bound.A comparison between two values.The DATATYPE function, as defined in SPARQL Query Language for RDF.The MINUS set operator, which returns the result of the left tuple expression, except for the results that are also returned by the right tuple expression.A tuple expression that contains zero solutions.Checks whether the wrapped Query produces any results.An extension operator that can be used to add bindings to solutions whose values are defined byvalue expressions.The FILTER operator, as defined in SPARQL Query Language for RDF.A call to an (external) function that operates on zero or more arguments.A tuple operator that groups tuples that have a specific set of equivalent variable bindings, and that can apply aggregate functions on the grouped results.The GROUP_CONCAT operator as defined in http://www.w3.org/TR/sparql11-query/#aggregatesA tuple operator that groups tuples that have a specific set of equivalent variable bindings, and that can apply aggregate functions on the grouped results.The IF function, as defined in SPARQL 1.1 Query.Checks whether a certain value is contained in a set of results produced by a query.The INTERSECT set operator, which returns the intersection of the result sets of two tuple expressions.The IRI function, as defined in SPARQL 1.1 Query Language for RDF.IsNumeric - Boolean operator determining if the supplied expression represents a numeric value.A natural join between two tuple expressions.The LABEL function, which selects the label of literals.The LANG function, as defined in SPARQL Query Language for RDF.Checks whether a language tag (e.g.The LeftJoin operator, as defined in SPARQL Query Language for RDF.ValueOperator that verifies if the first of its arguments occurs in any of the subsequent arguments.The LOCAL NAME function, which selects the local name of URIs.A mathematical expression consisting an operator and two arguments.A "multi-projection" that can produce multiple solutions from a single set of bindings.The NAMESPACE function, which selects the namespace of URIs.An abstract superclass for N-ary value operators.A boolean NOT operator operating on a boolean expressions.A boolean OR operator operating on two boolean expressions.An order operator that can be used to order bindings as specified by a set of value expressions.A generalized projection (allowing the bindings to be renamed) on a tuple expression.Projection elements control which of the selected expressions (produced by the WHERE clause of a query) are returned in the solution, and the order in which they appear.Main interface for all query model nodes.QueryModelVisitor<X extends Exception>An interface for query model visitors, implementing the Visitor pattern.A semantics-less query model node that is used as the root of query model trees.Compares the string representation of a value expression to a pattern.Checks RDF term equality.The SAMPLE operator as defined in http://www.w3.org/TR/sparql11-query/#aggregatesThe SERVICE keyword as defined in SERVICE definition.A tuple expression that contains exactly one solution with zero bindings.The SLICE operator, as defined in SPARQL Query Language for RDF.A tuple expression that matches a statement pattern against an RDF graph.Indicates the scope of the statement pattern.The STR function, as defined in SPARQL Query Language for RDF; returns the label of literals or the string representation of URIs.The SUM operator as defined in http://www.w3.org/TR/sparql11-query/#aggregatesTriple lookup reference.An expression that evaluates to RDF tuples.A call to a TupleFunction.An abstract superclass for unary tuple operators which, by definition, has one argument.An abstract superclass for unary value operators which, by definition, has one argument.The UNION set operator, which return the union of the result sets of two tuple expressions.An expression that executes an update.A ValueExpr with a constant value.An expressions that evaluates to Value objects.A variable that can contain a Value.QueryModelNodes that can constitute a variable scope change (such as group graph patterns, subselects, etc).A tuple expression that matches a path of length zero against an RDF graph.