org.openrdf.query.algebra

Class Count

java.lang.Object

org.openrdf.query.algebra.QueryModelNodeBase

org.openrdf.query.algebra.UnaryValueOperator

org.openrdf.query.algebra.AggregateOperatorBase

org.openrdf.query.algebra.Count

All Implemented Interfaces:

Serializable, Cloneable, AggregateOperator, QueryModelNode, ValueExpr

public class Count
extends AggregateOperatorBase

Author:

David Huynh, Jeen Broekstra

See Also:

Serialized Form

Field Summary

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

arg

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
Count	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.
String	getSignature() Default implementation of QueryModelNode.getSignature() that prints the name of the node's class.
int	hashCode()
<X extends Exception> void	visit(QueryModelVisitor<X> visitor) Visits this node.

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

isDistinct, setDistinct

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

getArg, replaceChildNode, setArg, visitChildren

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

getParentNode, 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

getParentNode, replaceChildNode, replaceWith, setParentNode, toString, visitChildren

Constructor Detail

Count

public Count(ValueExpr arg)

Count

public Count(ValueExpr arg,
             boolean distinct)

Method Detail

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

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 interface QueryModelNode

Overrides:

equals in class UnaryValueOperator

hashCode

public int hashCode()

Overrides:

hashCode in class AggregateOperatorBase

clone

public Count 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 AggregateOperatorBase

Returns:

A deep clone of this query model node.

getSignature

public String getSignature()

Description copied from class: QueryModelNodeBase

Default implementation of QueryModelNode.getSignature() that prints the name of the node's class.

Specified by:

getSignature in interface QueryModelNode

Overrides:

getSignature in class QueryModelNodeBase

Returns:

The node's signature, e.g. SLICE (offset=10, limit=10).