net.esper.client.soda
Class CaseWhenThenExpression

java.lang.Object
  extended by net.esper.client.soda.ExpressionBase
      extended by net.esper.client.soda.CaseWhenThenExpression
All Implemented Interfaces:
Serializable, Expression

public class CaseWhenThenExpression
extends ExpressionBase

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

See Also:
Serialized Form

Constructor Summary
CaseWhenThenExpression()
          Ctor - for use to create an expression tree, without child expression.
 
Method Summary
 CaseWhenThenExpression add(Expression when, Expression then)
          Adds a when-then pair of expressions.
 CaseWhenThenExpression setElse(Expression elseExpr)
          Sets the expression to provide a value when no when-condition matches.
 void toEQL(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 net.esper.client.soda.ExpressionBase
addChild, getChildren
 
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

toEQL

public void toEQL(StringWriter writer)
Description copied from interface: Expression
Renders the expressions and all it's child expression, in full tree depth, as a string in language syntax.

Parameters:
writer - is the output to use