FilterTuple (Eclipse RDF4J 4.2.4)

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

All Methods Instance Methods Abstract Methods
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 Detail
  - 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