com.hp.hpl.jena.sparql.expr

Class ExprAggregator

java.lang.Object

com.hp.hpl.jena.sparql.expr.ExprNode

com.hp.hpl.jena.sparql.expr.ExprAggregator

All Implemented Interfaces:

Expr

public class ExprAggregator
extends ExprNode

Group aggregation functions calculated a value during grouping and placed in the output binding. This class is relationship of an aggregation expression and that variable. Evaluation returns the variable's bound value.

Field Summary

Fields inherited from interface com.hp.hpl.jena.sparql.expr.Expr

CMP_EQUAL, CMP_GREATER, CMP_INDETERMINATE, CMP_LESS, CMP_UNEQUAL

Constructor Summary

Constructors

Constructor and Description
ExprAggregator(Var v, Aggregator agg)

Method Summary

Methods

Modifier and Type	Method and Description
Expr	apply(ExprTransform transform)
ExprAggregator	applyNodeTransform(NodeTransform transform) Rewrite, applying a node->node transformation
String	asSparqlExpr()
Var	asVar() Convert to a Var variable.
Expr	copy(Var v)
ExprAggregator	copySubstitute(Binding binding, boolean foldConstants)
boolean	equals(Object other)
NodeValue	eval(Binding binding, FunctionEnv env) Evaluate this expression against the binding
Aggregator	getAggregator()
ExprVar	getAggVar()
ExprVar	getExprVar() Variable (or null)
Var	getVar()
int	hashCode()
void	setVar(Var v)
String	toString()
void	visit(ExprVisitor visitor)

Methods inherited from class com.hp.hpl.jena.sparql.expr.ExprNode

copySubstitute, deepCopy, getConstant, getExpr, getFunction, getGraphPattern, getVarName, getVarNamesMentioned, getVarsMentioned, isConstant, isExpr, isFunction, isGraphPattern, isSatisfied, isVariable, varNamesMentioned, varsMentioned

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ExprAggregator

public ExprAggregator(Var v,
              Aggregator agg)

Method Detail

getVar

public Var getVar()

setVar

public void setVar(Var v)

getAggregator

public Aggregator getAggregator()

hashCode

public int hashCode()

Specified by:

hashCode in class ExprNode

equals

public boolean equals(Object other)

Specified by:

equals in class ExprNode

getExprVar

public ExprVar getExprVar()

Description copied from interface: Expr

Variable (or null)

Specified by:

getExprVar in interface Expr

Overrides:

getExprVar in class ExprNode

asVar

public Var asVar()

Description copied from interface: Expr

Convert to a Var variable.

Specified by:

asVar in interface Expr

Overrides:

asVar in class ExprNode

getAggVar

public ExprVar getAggVar()

asSparqlExpr

public String asSparqlExpr()

copySubstitute

public ExprAggregator copySubstitute(Binding binding,
                            boolean foldConstants)

Specified by:

copySubstitute in interface Expr

Specified by:

copySubstitute in class ExprNode

applyNodeTransform

public ExprAggregator applyNodeTransform(NodeTransform transform)

Description copied from interface: Expr

Rewrite, applying a node->node transformation

Specified by:

applyNodeTransform in interface Expr

Specified by:

applyNodeTransform in class ExprNode

toString

public String toString()

Overrides:

toString in class ExprNode

copy

public Expr copy(Var v)

eval

public NodeValue eval(Binding binding,
             FunctionEnv env)

Description copied from interface: Expr

Evaluate this expression against the binding

Specified by:

eval in interface Expr

Specified by:

eval in class ExprNode

apply

public Expr apply(ExprTransform transform)

visit

public void visit(ExprVisitor visitor)