Package org.eclipse.rdf4j.federated.algebra

Interface FilterTuple

All Superinterfaces:

Cloneable, QueryModelNode, Serializable

All Known Implementing Classes:

ExclusiveGroup, ExclusiveStatement, FedXStatementPattern, StatementSourcePattern

public interface FilterTuple
extends QueryModelNode

Expressions implementing this interface can apply some FilterValueExpr during evaluation.

Author:

Andreas Schwarte

See Also:

• StatementSourcePattern
• ExclusiveStatement
• ExclusiveGroup

Method Summary

Modifier and Type	Method	Description
void	addBoundFilter(String varName, Value value)	register a filter that can be directly expressed as a binding, e.g.
void	addFilterExpr(FilterExpr expr)	register a new filter expression.
BindingSet	getBoundFilters()	Returns bound filter bindings, that need to be added as additional bindings to the final result
FilterValueExpr	getFilterExpr()
List<String>	getFreeVars()
boolean	hasFilter()

Methods inherited from interface org.eclipse.rdf4j.query.algebra.QueryModelNode

clone, equals, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getSignature, getTotalTimeNanosActual, replaceChildNode, replaceWith, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, toString, visit, visitChildren

Method Details

hasFilter

boolean hasFilter()

Returns:

true if this expression has a filter to apply

addFilterExpr

void addFilterExpr(FilterExpr expr)

register a new filter expression. If the expr has already a filter registered, the new expression is added to a ConjunctiveFilterExpr.

Parameters:

expr -

addBoundFilter

void addBoundFilter(String varName,
 Value value)

register a filter that can be directly expressed as a binding, e.g. SELECT * WHERE { ?s p o . FILTER (?s = X) } is equivalent to SELECT * WHERE { X p o . }

Parameters:

varName -

value -

getFilterExpr

FilterValueExpr getFilterExpr()

Returns:

the currently registered filter expressions, usually of type FilterExpr or ConjunctiveFilterExpr

getFreeVars

List<String> getFreeVars()

Returns:

the free variables of this expression

getBoundFilters

BindingSet getBoundFilters()

Returns bound filter bindings, that need to be added as additional bindings to the final result

Returns:

the bound filters, or null