com.espertech.esper.client.soda

Class CaseWhenThenExpression

java.lang.Object

com.espertech.esper.client.soda.ExpressionBase

com.espertech.esper.client.soda.CaseWhenThenExpression

All Implemented Interfaces:

Expression, Serializable

public class CaseWhenThenExpression
extends ExpressionBase

Case expression that act as a when-then-else.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
CaseWhenThenExpression() Ctor - for use to create an expression tree, without child expression.

Method Summary

Modifier and Type	Method and Description
CaseWhenThenExpression	add(Expression when, Expression then) Adds a when-then pair of expressions.
ExpressionPrecedenceEnum	getPrecedence() Returns precedence.
CaseWhenThenExpression	setElse(Expression elseExpr) Sets the expression to provide a value when no when-condition matches.
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

CaseWhenThenExpression

public CaseWhenThenExpression()

Ctor - for use to create an expression tree, without child expression.

Use add methods to add child expressions to acts upon.

Method Detail

add

public CaseWhenThenExpression add(Expression when,
                                  Expression then)

Adds a when-then pair of expressions.

Parameters:

when - providings conditions to evaluate

then - provides the result when a condition evaluates to true

Returns:

expression

setElse

public CaseWhenThenExpression setElse(Expression elseExpr)

Sets the expression to provide a value when no when-condition matches.

Parameters:

elseExpr - expression providing default result

Returns:

expression

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