Package com.espertech.esper.common.client.soda

Class CaseSwitchExpression

java.lang.Object

com.espertech.esper.common.client.soda.ExpressionBase

com.espertech.esper.common.client.soda.CaseSwitchExpression

All Implemented Interfaces:

Expression, Serializable

public class CaseSwitchExpression
extends ExpressionBase

Case-expression that acts as a switch testing a value against other values.

The first child expression provides the value to switch on. The following pairs of child expressions provide the "when expression then expression" results. The last child expression provides the "else" result.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
CaseSwitchExpression()	Ctor - for use to create an expression tree, without inner expression
CaseSwitchExpression(Expression switchValue)	Ctor.

Method Summary

Modifier and Type	Method	Description
CaseSwitchExpression	add(Expression when, Expression then)	Adds a pair of expressions representing a "when" and a "then" in the switch.
ExpressionPrecedenceEnum	getPrecedence()	Returns precedence.
CaseSwitchExpression	setElse(Expression elseExpr)	Sets the else-part of the case-switch.
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.common.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 Details

CaseSwitchExpression

public CaseSwitchExpression()

Ctor - for use to create an expression tree, without inner expression

CaseSwitchExpression

public CaseSwitchExpression(Expression switchValue)

Ctor.

Parameters:

switchValue - is the expression providing the value to switch on

Method Details

add

public CaseSwitchExpression add(Expression when,
 Expression then)

Adds a pair of expressions representing a "when" and a "then" in the switch.

Parameters:

when - expression to match on

then - expression to return a conditional result when the when-expression matches

Returns:

expression

setElse

public CaseSwitchExpression setElse(Expression elseExpr)

Sets the else-part of the case-switch. This result of this expression is returned when no when-expression matched.

Parameters:

elseExpr - is the expression returning the no-match value

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