Package org.eclipse.rdf4j.query.algebra
Class Slice
- java.lang.Object
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- org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
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- org.eclipse.rdf4j.query.algebra.UnaryTupleOperator
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- org.eclipse.rdf4j.query.algebra.Slice
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- All Implemented Interfaces:
Serializable
,Cloneable
,GraphPatternGroupable
,QueryModelNode
,TupleExpr
,VariableScopeChange
public class Slice extends UnaryTupleOperator
The SLICE operator, as defined in SPARQL Query Language for RDF. The SLICE operator selects specific results from the underlying tuple expression based on an offset and limit value (both optional).- Author:
- Arjohn Kampman
- See Also:
- Serialized Form
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Field Summary
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Fields inherited from class org.eclipse.rdf4j.query.algebra.UnaryTupleOperator
arg
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Slice
clone()
Returns a (deep) clone of this query model node.boolean
equals(Object other)
Returns true if this query model node and its children are recursively equal to o and its children.long
getLimit()
long
getOffset()
String
getSignature()
Default implementation ofQueryModelNode.getSignature()
that prints the name of the node's class.int
hashCode()
boolean
hasLimit()
Checks whether the row selection has a (valid) limit.boolean
hasOffset()
Checks whether the row selection has a (valid) offset.void
setLimit(long limit)
void
setOffset(long offset)
<X extends Exception>
voidvisit(QueryModelVisitor<X> visitor)
Visits this node.-
Methods inherited from class org.eclipse.rdf4j.query.algebra.UnaryTupleOperator
getArg, getAssuredBindingNames, getBindingNames, replaceChildNode, setArg, visitChildren
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Methods inherited from class org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
getCardinality, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getTotalTimeNanosActual, isCardinalitySet, isGraphPatternGroup, isVariableScopeChange, nullEquals, replaceNodeInList, replaceWith, resetCardinality, setCardinality, setCostEstimate, setGraphPatternGroup, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, setVariableScopeChange, shouldCacheCardinality, toString
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Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.eclipse.rdf4j.query.algebra.QueryModelNode
getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getTotalTimeNanosActual, replaceWith, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, toString
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Method Detail
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getOffset
public long getOffset()
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setOffset
public void setOffset(long offset)
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hasOffset
public boolean hasOffset()
Checks whether the row selection has a (valid) offset.- Returns:
- true when offset > 0
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getLimit
public long getLimit()
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setLimit
public void setLimit(long limit)
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hasLimit
public boolean hasLimit()
Checks whether the row selection has a (valid) limit.- Returns:
- true when offset >= 0
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visit
public <X extends Exception> void visit(QueryModelVisitor<X> visitor) throws X extends Exception
Description copied from interface:QueryModelNode
Visits this node. The node reports itself to the visitor with the proper runtime type.- Throws:
X extends Exception
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getSignature
public String getSignature()
Description copied from class:AbstractQueryModelNode
Default implementation ofQueryModelNode.getSignature()
that prints the name of the node's class.- Specified by:
getSignature
in interfaceQueryModelNode
- Overrides:
getSignature
in classAbstractQueryModelNode
- Returns:
- The node's signature, e.g. SLICE (offset=10, limit=10).
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equals
public boolean equals(Object other)
Description copied from interface:QueryModelNode
Returns true if this query model node and its children are recursively equal to o and its children.- Specified by:
equals
in interfaceQueryModelNode
- Overrides:
equals
in classUnaryTupleOperator
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hashCode
public int hashCode()
- Overrides:
hashCode
in classUnaryTupleOperator
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clone
public Slice clone()
Description copied from interface:QueryModelNode
Returns a (deep) clone of this query model node. This method recursively clones the entire node tree, starting from this nodes.- Specified by:
clone
in interfaceQueryModelNode
- Specified by:
clone
in interfaceTupleExpr
- Overrides:
clone
in classUnaryTupleOperator
- Returns:
- A deep clone of this query model node.
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