Package org.eclipse.birt.chart.factory
Interface IDataRowExpressionEvaluator
- All Known Subinterfaces:
IGroupedDataRowExpressionEvaluator
- All Known Implementing Classes:
AbstractGroupedDataRowExpressionEvaluator
,DataRowExpressionEvaluatorAdapter
public interface IDataRowExpressionEvaluator
This interface provide expression evaluations of any string expression based
on a row context. This is usually associated with an underlying resultset.
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Method Summary
Modifier and TypeMethodDescriptionvoid
close()
Closes the underlying resultset.Evaluates the expression based on the current rowevaluateGlobal
(String expression) Deprecated.Not used anymore.boolean
first()
Moves to the first row.boolean
next()
Moves to the next row.
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Method Details
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evaluate
Evaluates the expression based on the current row- Parameters:
A
- String expression- Returns:
- An Object representing the evaluated expression. The Object must be of a type String, Number, Date, Calendar, or it will be evaluated as a String using toString(). If there is any BirtException being caught by evaluation, the return value will be the caught BirtException.
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evaluateGlobal
Deprecated.Not used anymore. useevaluate(String)
instead.Evaluates the global expressions which are not associated with the data rows.- Parameters:
A
- String expression- Returns:
- An Object representing the evaluated expression. The Object must be of a type String, Number, Date, Calendar, or it will be evaluated as a String using toString().
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first
boolean first()Moves to the first row. Optional if already positioned on the first row when passed to Generator.bindData()- Returns:
true
if the cursor is on a valid row;false
if there are no rows in the result set
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next
boolean next()Moves to the next row.- Returns:
- False if the last row has been reached. True otherwise.
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close
void close()Closes the underlying resultset. This is optional (it can be a no-op if the close is handled externally or not needed).
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