org.openrdf.query.algebra

Class AggregateOperatorBase

java.lang.Object

org.openrdf.query.algebra.QueryModelNodeBase

org.openrdf.query.algebra.UnaryValueOperator

org.openrdf.query.algebra.AggregateOperatorBase

All Implemented Interfaces:

Serializable, Cloneable, AggregateOperator, QueryModelNode, ValueExpr

Direct Known Subclasses:

Avg, Count, GroupConcat, Max, Min, Sample, Sum

public abstract class AggregateOperatorBase
extends UnaryValueOperator
implements AggregateOperator

Base class for shared functionality of aggregate operators (e.g. DISTINCT setting)

Author:

Jeen Broekstra

See Also:

Serialized Form

Field Summary

Fields inherited from class org.openrdf.query.algebra.UnaryValueOperator

arg

Constructor Summary

Constructors

Constructor and Description
AggregateOperatorBase(ValueExpr arg)
AggregateOperatorBase(ValueExpr arg, boolean distinct)

Method Summary

Modifier and Type	Method and Description
AggregateOperatorBase	clone() Returns a (deep) clone of this query model node.
int	hashCode()
boolean	isDistinct()
void	setDistinct(boolean distinct)

Methods inherited from class org.openrdf.query.algebra.UnaryValueOperator

equals, getArg, replaceChildNode, setArg, visitChildren

Methods inherited from class org.openrdf.query.algebra.QueryModelNodeBase

getParentNode, getSignature, nullEquals, replaceNodeInList, replaceWith, setParentNode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.openrdf.query.algebra.QueryModelNode

equals, getParentNode, getSignature, replaceChildNode, replaceWith, setParentNode, toString, visit, visitChildren

Constructor Detail

AggregateOperatorBase

public AggregateOperatorBase(ValueExpr arg)

AggregateOperatorBase

public AggregateOperatorBase(ValueExpr arg,
                             boolean distinct)

Method Detail

setDistinct

public void setDistinct(boolean distinct)

Specified by:

setDistinct in interface AggregateOperator

isDistinct

public boolean isDistinct()

Specified by:

isDistinct in interface AggregateOperator

hashCode

public int hashCode()

Overrides:

hashCode in class UnaryValueOperator

clone

public AggregateOperatorBase 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 interface AggregateOperator

Specified by:

clone in interface QueryModelNode

Specified by:

clone in interface ValueExpr

Overrides:

clone in class UnaryValueOperator

Returns:

A deep clone of this query model node.