Package org.eclipse.rdf4j.query.algebra

Abstract Query Algebra model.

See: Description

Interface Summary

Interface	Description
AggregateOperator	An operator that returns aggregates values.
GraphPatternGroupable	Deprecated since 3.2.
QueryModelNode	Main interface for all query model nodes.
QueryModelVisitor<X extends Exception>	An interface for query model visitors, implementing the Visitor pattern.
TupleExpr	An expression that evaluates to RDF tuples.
UpdateExpr	An expression that executes an update.
ValueExpr	An expressions that evaluates to Value objects.
VariableScopeChange	QueryModelNodes that can constitute a variable scope change (such as group graph patterns, subselects, etc).

Class Summary

Class	Description
AbstractAggregateOperator	Base class for shared functionality of aggregate operators (e.g.
AbstractQueryModelNode	Base implementation of QueryModelNode.
Add
AggregateOperatorBase	Deprecated since 2.0.
And	A boolean AND operator operating on two boolean expressions.
ArbitraryLengthPath	A tuple expression that matches a path of arbitrary length against an RDF graph.
Avg	The AVG operator as defined in http://www.w3.org/TR/sparql11-query/#aggregates.
BinaryTupleOperator	An abstract superclass for binary tuple operators which, by definition, has two arguments.
BinaryValueOperator	An abstract superclass for binary value operators which, by definition, has two arguments.
BindingSetAssignment
BNodeGenerator	A BNode generator, which generates a new BNode each time it needs to supply a value.
Bound	The BOUND function, as defined in SPARQL Query Language for RDF; checks if a variable is bound.
Clear
Coalesce
Compare	A comparison between two values.
CompareAll
CompareAny
CompareSubQueryValueOperator
Copy
Count
Create
Datatype	The DATATYPE function, as defined in SPARQL Query Language for RDF.
DeleteData
DescribeOperator
Difference	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.
Distinct
EmptySet	A tuple expression that contains zero solutions.
Exists	Checks whether the wrapped Query produces any results.
Extension	An extension operator that can be used to add bindings to solutions whose values are defined by value expressions.
ExtensionElem
Filter	The FILTER operator, as defined in SPARQL Query Language for RDF.
FunctionCall	A call to an (external) function that operates on zero or more arguments.
Group	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.
GroupConcat	The GROUP_CONCAT operator as defined in http://www.w3.org/TR/sparql11-query/#aggregates
GroupElem	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.
If	The IF function, as defined in SPARQL 1.1 Query.
In	Checks whether a certain value is contained in a set of results produced by a query.
InsertData
Intersection	The INTERSECT set operator, which returns the intersection of the result sets of two tuple expressions.
IRIFunction	The IRI function, as defined in SPARQL 1.1 Query Language for RDF.
IsBNode
IsLiteral
IsNumeric	IsNumeric - Boolean operator determining if the supplied expression represents a numeric value.
IsResource
IsURI
Join	A natural join between two tuple expressions.
Label	The LABEL function, which selects the label of literals.
Lang	The LANG function, as defined in SPARQL Query Language for RDF.
LangMatches	Checks whether a language tag (e.g.
LeftJoin	The LeftJoin operator, as defined in SPARQL Query Language for RDF.
Like	Compares the string representation of a value expression to a pattern.
ListMemberOperator	ValueOperator that verifies if the first of its arguments occurs in any of the subsequent arguments.
Load
LocalName	The LOCAL NAME function, which selects the local name of URIs.
MathExpr	A mathematical expression consisting an operator and two arguments.
Max
Min
Modify
Move
MultiProjection	A "multi-projection" that can produce multiple solutions from a single set of bindings.
Namespace	The NAMESPACE function, which selects the namespace of URIs.
NAryValueOperator	An abstract superclass for N-ary value operators.
Not	A boolean NOT operator operating on a boolean expressions.
Or	A boolean OR operator operating on two boolean expressions.
Order	An order operator that can be used to order bindings as specified by a set of value expressions.
OrderElem
Projection	A generalized projection (allowing the bindings to be renamed) on a tuple expression.
ProjectionElem
ProjectionElemList
QueryModelNodeBase	Deprecated since 2.0.
QueryRoot	A semantics-less query model node that is used as the root of query model trees.
Reduced
Regex	Compares the string representation of a value expression to a pattern.
SameTerm	Checks RDF term equality.
Sample	The SAMPLE operator as defined in http://www.w3.org/TR/sparql11-query/#aggregates
Service	The SERVICE keyword as defined in SERVICE definition.
SingletonSet	A tuple expression that contains exactly one solution with zero bindings.
Slice	The SLICE operator, as defined in SPARQL Query Language for RDF.
StatementPattern	A tuple expression that matches a statement pattern against an RDF graph.
Str	The STR function, as defined in SPARQL Query Language for RDF; returns the label of literals or the string representation of URIs.
SubQueryValueOperator
Sum	The SUM operator as defined in http://www.w3.org/TR/sparql11-query/#aggregates
TripleRef	Triple lookup reference.
TupleFunctionCall	A call to a TupleFunction.
UnaryTupleOperator	An abstract superclass for unary tuple operators which, by definition, has one argument.
UnaryValueOperator	An abstract superclass for unary value operators which, by definition, has one argument.
Union	The UNION set operator, which return the union of the result sets of two tuple expressions.
ValueConstant	A ValueExpr with a constant value.
ValueExprTripleRef
Var	A variable that can contain a Value.
ZeroLengthPath	A tuple expression that matches a path of length zero against an RDF graph.

Enum Summary

Enum	Description
Compare.CompareOp
MathExpr.MathOp
StatementPattern.Scope	Indicates the scope of the statement pattern.

Package org.eclipse.rdf4j.query.algebra Description

Abstract Query Algebra model. The root of the query algebra hierarchy is QueryModelNode.