|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectcom.espertech.esper.client.soda.ExpressionBase
com.espertech.esper.client.soda.CoalesceExpression
public class CoalesceExpression
Coalesce-function which returns the first non-null value in a list of values.
Constructor Summary | |
---|---|
CoalesceExpression()
Ctor - for use to create an expression tree, without child expression. |
|
CoalesceExpression(Expression exprOne,
Expression exprTwo,
Expression... moreExpressions)
Ctor. |
|
CoalesceExpression(String propertyOne,
String propertyTwo,
String... moreProperties)
Ctor. |
Method Summary | |
---|---|
CoalesceExpression |
add(Expression expression)
Add an expression to include in the computation. |
CoalesceExpression |
add(Object object)
Add a constant to include in the computation. |
CoalesceExpression |
add(String propertyName)
Add a property to include in the computation. |
void |
toEPL(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 |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
---|
public CoalesceExpression()
Use add methods to add child expressions to acts upon.
public CoalesceExpression(String propertyOne, String propertyTwo, String... moreProperties)
propertyOne
- the first property in the expressionpropertyTwo
- the second property in the expressionmoreProperties
- optional more properties in the expressionpublic CoalesceExpression(Expression exprOne, Expression exprTwo, Expression... moreExpressions)
exprOne
- provides the first value in the expressionexprTwo
- provides the second value in the expressionmoreExpressions
- optional more expressions that are part of the functionMethod Detail |
---|
public CoalesceExpression add(Object object)
object
- constant to add
public CoalesceExpression add(Expression expression)
expression
- to add
public CoalesceExpression add(String propertyName)
propertyName
- is the name of the property
public void toEPL(StringWriter writer)
Expression
writer
- is the output to use
|
© 2007 EsperTech Inc. All rights reserved. Visit us at espertech.com |
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |