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## Package org.apache.poi.ss.formula

This package contains common internal POI code for manipulating formulas.

See:
Description

Interface Summary
EvaluationCell | Abstracts a cell for the purpose of formula evaluation.
EvaluationName | Abstracts a name record for formula evaluation. For POI internal use only
EvaluationSheet | Abstracts a sheet for the purpose of formula evaluation. For POI internal use only
EvaluationWorkbook | Abstracts a workbook for the purpose of formula evaluation. For POI internal use only
ExternSheetReferenceToken | Should be implemented by any `Ptg` subclass that needs has an extern sheet index For POI internal use only
FormulaParsingWorkbook | Abstracts a workbook for the purpose of formula parsing. For POI internal use only
FormulaRenderingWorkbook | Abstracts a workbook for the purpose of converting formula to text. For POI internal use only
IStabilityClassifier | Used to help optimise cell evaluation result caching by allowing applications to specify which parts of a workbook are final. The term final is introduced here to denote immutability or 'having constant definition'.
TwoDEval | Common interface of `AreaEval` and `AreaEvalBase`
WorkbookDependentFormula | Should be implemented by any `Ptg` subclass that needs a workbook to render its formula.

Class Summary
CollaboratingWorkbooksEnvironment | Manages a collection of `WorkbookEvaluator`s, in order to support evaluation of formulas across spreadsheets. For POI internal use only
EvaluationWorkbook.ExternalName |
EvaluationWorkbook.ExternalSheet |
Formula | Encapsulates an encoded formula token array.
FormulaParser | This class parses a formula string into a List of tokens in RPN order.
FormulaRenderer | Common logic for rendering formulas. For POI internal use only
FormulaType | Enumeration of various formula types. For POI internal use only
OperationEvaluationContext | Contains all the contextual information required to evaluate an operation within a formula For POI internal use only
WorkbookEvaluator | Evaluates formula cells. For performance reasons, this class keeps a cache of all previously calculated intermediate cell values.

Exception Summary
CollaboratingWorkbooksEnvironment.WorkbookNotFoundException |
FormulaParseException | This exception thrown when a supplied formula has incorrect syntax (or syntax currently not supported by POI).

## Package org.apache.poi.ss.formula Description

This package contains common internal POI code for manipulating formulas. Client applications should not refer to these classes directly.

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