com.espertech.esper.client.soda

Class AccessProjectionExpressionBase

java.lang.Object

com.espertech.esper.client.soda.ExpressionBase

com.espertech.esper.client.soda.AccessProjectionExpressionBase

All Implemented Interfaces:

Expression, Serializable

Direct Known Subclasses:

FirstProjectionExpression, LastProjectionExpression, WindowProjectionExpression

public abstract class AccessProjectionExpressionBase
extends ExpressionBase

Represents the base expression for "first", "last" and "window" aggregation functions.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
AccessProjectionExpressionBase() Ctor.
AccessProjectionExpressionBase(Expression expression) Ctor.

Method Summary

Modifier and Type	Method and Description
abstract String	getAggregationFunctionName() Returns the function name of the aggregation function.
ExpressionPrecedenceEnum	getPrecedence() Returns precedence.
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

AccessProjectionExpressionBase

public AccessProjectionExpressionBase()

Ctor.

AccessProjectionExpressionBase

public AccessProjectionExpressionBase(Expression expression)

Ctor.

Parameters:

expression - to aggregate

Method Detail

getAggregationFunctionName

public abstract String getAggregationFunctionName()

Returns the function name of the aggregation function.

Returns:

function name

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