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:

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

Field Summary

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

arg

Constructor Summary

AggregateOperatorBase(ValueExpr arg)

AggregateOperatorBase(ValueExpr arg, boolean distinct)

Method Summary

AggregateOperatorBase	clone() Returns a (deep) clone of this query model node.
boolean	isDistinct()
void	setDistinct(boolean distinct)

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

equals, getArg, hashCode, 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

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.