Package com.espertech.esper.common.client.soda

Class SumProjectionExpression

java.lang.Object

com.espertech.esper.common.client.soda.ExpressionBase

com.espertech.esper.common.client.soda.SumProjectionExpression

All Implemented Interfaces:

Expression, Serializable

public class SumProjectionExpression
extends ExpressionBase

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

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
SumProjectionExpression()	Ctor.
SumProjectionExpression(boolean isDistinct)	Ctor - for use to create an expression tree, without inner expression
SumProjectionExpression(Expression expression, boolean isDistinct)	Ctor - adds the expression to project.

Method Summary

Modifier and Type	Method	Description
ExpressionPrecedenceEnum	getPrecedence()	Returns precedence.
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	toPrecedenceFreeEPL(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 com.espertech.esper.common.client.soda.ExpressionBase

addChild, getChildren, getTreeObjectName, renderAggregation, setChildren, setTreeObjectName, toEPL, toPrecedenceFreeEPL, toPrecedenceFreeEPL

Methods inherited from class java.lang.Object

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

Constructor Details

SumProjectionExpression

public SumProjectionExpression()

Ctor.

SumProjectionExpression

public SumProjectionExpression(boolean isDistinct)

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

Parameters:

isDistinct - true if distinct

SumProjectionExpression

public SumProjectionExpression(Expression expression,
 boolean isDistinct)

Ctor - adds the expression to project.

Parameters:

expression - returning values to project

isDistinct - true if distinct

Method Details

getPrecedence

public ExpressionPrecedenceEnum getPrecedence()

Description copied from interface: Expression

Returns precedence.

Returns:

precedence

toPrecedenceFreeEPL

public void toPrecedenceFreeEPL(StringWriter writer)

Description copied from class: ExpressionBase

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

Specified by:

toPrecedenceFreeEPL in class ExpressionBase

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