com.espertech.esper.client.soda

Class NewOperatorExpression

java.lang.Object

com.espertech.esper.client.soda.ExpressionBase

com.espertech.esper.client.soda.NewOperatorExpression

All Implemented Interfaces:

Expression, Serializable

public class NewOperatorExpression
extends ExpressionBase

The "new" operator is useful to format an event or event property from a list of column names and expressions.

Useful with enumeration methods and with case-when clauses that return multiple result values, for example.

Column names are part of the state and the number of column names must match the number of sub-expressions to the expression.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
NewOperatorExpression() Ctor.
NewOperatorExpression(List<String> columnNames) Ctor.

Method Summary

Modifier and Type	Method and Description
List<String>	getColumnNames() Returns the column names.
ExpressionPrecedenceEnum	getPrecedence() Returns precedence.
void	setColumnNames(List<String> columnNames) Sets the column names.
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

NewOperatorExpression

public NewOperatorExpression()

Ctor.

NewOperatorExpression

public NewOperatorExpression(List<String> columnNames)

Ctor.

The list of column names should match the number of expressions provided hereunder.

Parameters:

columnNames - list of column names

Method Detail

getColumnNames

public List<String> getColumnNames()

Returns the column names.

Returns:

colum names

setColumnNames

public void setColumnNames(List<String> columnNames)

Sets the column names.

Parameters:

columnNames - colum names to set

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