net.esper.client.soda
Class AvgProjectionExpression

java.lang.Object
  net.esper.client.soda.ExpressionBase
      net.esper.client.soda.AvgProjectionExpression

All Implemented Interfaces:

Serializable, Expression

public class AvgProjectionExpression
extends ExpressionBase

Average of the (distinct) values returned by an expression.

Expects a single child expression providing the values to aggregate.

See Also:

Serialized Form

Constructor Summary

AvgProjectionExpression(boolean isDistinct)
Ctor - for use to create an expression tree, without inner expression

AvgProjectionExpression(Expression expression, boolean isDistinct)
Ctor - adds the expression to project.

Method Summary

boolean	isDistinct() Returns true if the projection considers distinct values only.
void	setDistinct(boolean distinct) Set the distinct flag indicating the projection considers distinct values only.
void	toEQL(StringWriter writer) Renders the expressions and all it's child expression, in full tree depth, as a string in language syntax.

Methods inherited from class net.esper.client.soda.ExpressionBase

addChild, getChildren

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AvgProjectionExpression

public AvgProjectionExpression(boolean isDistinct)

Ctor - for use to create an expression tree, without inner expression

Parameters:

isDistinct - true if distinct

AvgProjectionExpression

public AvgProjectionExpression(Expression expression,
                               boolean isDistinct)

Ctor - adds the expression to project.

Parameters:

expression - returning values to project

isDistinct - true if distinct

Method Detail

toEQL

public void toEQL(StringWriter writer)

Description copied from interface: Expression

Renders the expressions and all it's child expression, in full tree depth, as a string in language syntax.

Parameters:

writer - is the output to use

isDistinct

public boolean isDistinct()

Returns true if the projection considers distinct values only.

Returns:

true if distinct

setDistinct

public void setDistinct(boolean distinct)

Set the distinct flag indicating the projection considers distinct values only.

Parameters:

distinct - true for distinct, false for not distinct