com.espertech.esper.client.soda

Class PreviousExpression

java.lang.Object

com.espertech.esper.client.soda.ExpressionBase

com.espertech.esper.client.soda.PreviousExpression

All Implemented Interfaces:

Expression, Serializable

public class PreviousExpression
extends ExpressionBase

Previous function for obtaining property values of previous events.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PreviousExpression() Ctor.
PreviousExpression(Expression expression, String propertyName) Ctor.
PreviousExpression(int index, String propertyName) Ctor.
PreviousExpression(PreviousExpressionType type, Expression expression) Ctor.

Method Summary

Modifier and Type	Method and Description
ExpressionPrecedenceEnum	getPrecedence() Returns precedence.
PreviousExpressionType	getType() Returns the type of the previous expression (tail, first, window, count)
void	setType(PreviousExpressionType type) Sets the type of the previous expression (tail, first, window, count)
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.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 Detail

PreviousExpression

public PreviousExpression()

Ctor.

PreviousExpression

public PreviousExpression(Expression expression,
                          String propertyName)

Ctor.

Parameters:

expression - provides the index to use

propertyName - is the name of the property to return the value for

PreviousExpression

public PreviousExpression(int index,
                          String propertyName)

Ctor.

Parameters:

index - provides the index

propertyName - is the name of the property to return the value for

PreviousExpression

public PreviousExpression(PreviousExpressionType type,
                          Expression expression)

Ctor.

Parameters:

type - type of previous expression (tail, first, window, count)

expression - to evaluate

Method Detail

getPrecedence

public ExpressionPrecedenceEnum getPrecedence()

Description copied from interface: Expression

Returns precedence.

Returns:

precedence

getType

public PreviousExpressionType getType()

Returns the type of the previous expression (tail, first, window, count)

Returns:

type

setType

public void setType(PreviousExpressionType type)

Sets the type of the previous expression (tail, first, window, count)

Parameters:

type - to set

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