Class BaseFormulaEvaluator

java.lang.Object
org.apache.poi.ss.formula.BaseFormulaEvaluator
All Implemented Interfaces:
WorkbookEvaluatorProvider, FormulaEvaluator
Direct Known Subclasses:
BaseXSSFFormulaEvaluator, HSSFFormulaEvaluator

public abstract class BaseFormulaEvaluator extends Object implements FormulaEvaluator, WorkbookEvaluatorProvider
Common functionality across file formats for evaluating formula cells.

  • Field Details

  • Constructor Details

    • BaseFormulaEvaluator

      protected BaseFormulaEvaluator(WorkbookEvaluator bookEvaluator)
  • Method Details

    • setupEnvironment

      public static void setupEnvironment(String[] workbookNames, BaseFormulaEvaluator[] evaluators)
      Coordinates several formula evaluators together so that formulas that involve external references can be evaluated.
      Parameters:
      workbookNames - the simple file names used to identify the workbooks in formulas with external links (for example "MyData.xls" as used in a formula "[MyData.xls]Sheet1!A1")
      evaluators - all evaluators for the full set of workbooks required by the formulas.
    • setupReferencedWorkbooks

      public void setupReferencedWorkbooks(Map<String,FormulaEvaluator> evaluators)
      Description copied from interface: FormulaEvaluator
      Sets up the Formula Evaluator to be able to reference and resolve links to other workbooks, eg [Test.xls]Sheet1!A1.

      For a workbook referenced as [Test.xls]Sheet1!A1, you should supply a map containing the key Test.xls (no square brackets), and an open FormulaEvaluator onto that Workbook.

      Specified by:
      setupReferencedWorkbooks in interface FormulaEvaluator
      Parameters:
      evaluators - Map of workbook names (no square brackets) to an evaluator on that workbook
    • _getWorkbookEvaluator

      public WorkbookEvaluator _getWorkbookEvaluator()
      Description copied from interface: WorkbookEvaluatorProvider
      Provide the underlying WorkbookEvaluator
      Specified by:
      _getWorkbookEvaluator in interface WorkbookEvaluatorProvider
    • getEvaluationWorkbook

      protected EvaluationWorkbook getEvaluationWorkbook()
      internal use
      Returns:
      evaluation workbook
    • clearAllCachedResultValues

      public void clearAllCachedResultValues()
      Should be called whenever there are major changes (e.g. moving sheets) to input cells in the evaluated workbook. If performance is not critical, a single call to this method may be used instead of many specific calls to the notify~ methods. Failure to call this method after changing cell values will cause incorrect behaviour of the evaluate~ methods of this class
      Specified by:
      clearAllCachedResultValues in interface FormulaEvaluator
    • evaluate

      public CellValue evaluate(Cell cell)
      If cell contains a formula, the formula is evaluated and returned, else the CellValue simply copies the appropriate cell value from the cell and also its cell type. This method should be preferred over evaluateInCell() when the call should not modify the contents of the original cell.
      Specified by:
      evaluate in interface FormulaEvaluator
      Parameters:
      cell - may be null signifying that the cell is not present (or blank)
      Returns:
      null if the supplied cell is null or blank
    • evaluateInCell

      public Cell evaluateInCell(Cell cell)
      If cell contains formula, it evaluates the formula, and puts the formula result back into the cell, in place of the old formula. Else if cell does not contain formula, this method leaves the cell unchanged. Note that the same instance of Cell is returned to allow chained calls like:
       int evaluatedCellType = evaluator.evaluateInCell(cell).getCellType();
       
      Be aware that your cell value will be changed to hold the result of the formula. If you simply want the formula value computed for you, use evaluateFormulaCell(Cell)}
      Specified by:
      evaluateInCell in interface FormulaEvaluator
      Parameters:
      cell - The Cell to evaluate and modify.
      Returns:
      the cell that was passed in, allowing for chained calls
    • evaluateFormulaCellValue

      protected abstract CellValue evaluateFormulaCellValue(Cell cell)
    • evaluateFormulaCell

      public CellType evaluateFormulaCell(Cell cell)
      If cell contains formula, it evaluates the formula, and saves the result of the formula. The cell remains as a formula cell. Else if cell does not contain formula, this method leaves the cell unchanged. Note that the type of the formula result is returned, so you know what kind of value is also stored with the formula.
       CellType evaluatedCellType = evaluator.evaluateFormulaCell(cell);
       
      Be aware that your cell will hold both the formula, and the result. If you want the cell replaced with the result of the formula, use evaluate(org.apache.poi.ss.usermodel.Cell) }
      Specified by:
      evaluateFormulaCell in interface FormulaEvaluator
      Parameters:
      cell - The cell to evaluate
      Returns:
      The type of the formula result (the cell's type remains as CellType.FORMULA however) If cell is not a formula cell, returns CellType._NONE rather than throwing an exception.
    • evaluateFormulaCellEnum

      @Deprecated @Removal(version="4.2") public CellType evaluateFormulaCellEnum(Cell cell)
      Deprecated.
      use evaluateFormulaCell(cell) instead
      If cell contains formula, it evaluates the formula, and saves the result of the formula. The cell remains as a formula cell. Else if cell does not contain formula, this method leaves the cell unchanged. Note that the type of the formula result is returned, so you know what kind of value is also stored with the formula.
       CellType evaluatedCellType = evaluator.evaluateFormulaCell(cell);
       
      Be aware that your cell will hold both the formula, and the result. If you want the cell replaced with the result of the formula, use evaluate(org.apache.poi.ss.usermodel.Cell) }
      Specified by:
      evaluateFormulaCellEnum in interface FormulaEvaluator
      Parameters:
      cell - The cell to evaluate
      Returns:
      The type of the formula result (the cell's type remains as CellType.FORMULA however) If cell is not a formula cell, returns CellType._NONE rather than throwing an exception.
      Since:
      POI 3.15 beta 3
    • setCellType

      protected void setCellType(Cell cell, CellValue cv)
      set the cell type
      Parameters:
      cell -
      cv -
    • setCellType

      protected void setCellType(Cell cell, CellType cellType)
      Override if a different variation is needed, e.g. passing the evaluator to the cell method
      Parameters:
      cell -
      cellType -
    • createRichTextString

      protected abstract RichTextString createRichTextString(String str)
    • setCellValue

      protected void setCellValue(Cell cell, CellValue cv)
    • evaluateAllFormulaCells

      public static void evaluateAllFormulaCells(Workbook wb)
      Loops over all cells in all sheets of the supplied workbook. For cells that contain formulas, their formulas are evaluated, and the results are saved. These cells remain as formula cells. For cells that do not contain formulas, no changes are made. This is a helpful wrapper around looping over all cells, and calling evaluateFormulaCell on each one.
    • evaluateAllFormulaCells

      protected static void evaluateAllFormulaCells(Workbook wb, FormulaEvaluator evaluator)
    • setIgnoreMissingWorkbooks

      public void setIgnoreMissingWorkbooks(boolean ignore)
      Whether to ignore missing references to external workbooks and use cached formula results in the main workbook instead.

      In some cases external workbooks referenced by formulas in the main workbook are not available. With this method you can control how POI handles such missing references:

      Specified by:
      setIgnoreMissingWorkbooks in interface FormulaEvaluator
      Parameters:
      ignore - whether to ignore missing references to external workbooks
    • setDebugEvaluationOutputForNextEval

      public void setDebugEvaluationOutputForNextEval(boolean value)
      Perform detailed output of formula evaluation for next evaluation only? Is for developer use only (also developers using POI for their XLS files). Log-Level WARN is for basic info, INFO for detailed information. These quite high levels are used because you have to explicitly enable this specific logging.
      Specified by:
      setDebugEvaluationOutputForNextEval in interface FormulaEvaluator
      Parameters:
      value - whether to perform detailed output