Java tutorial
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See the License for the specific language governing permissions and limitations under the License. ==================================================================== */ package com.wantdo.stat.excel.poi_src.formula; import org.apache.poi.ss.formula.eval.NotImplementedException; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.FormulaEvaluator; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; import org.apache.poi.ss.usermodel.WorkbookFactory; import org.apache.poi.ss.util.CellReference; import java.io.File; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; import java.util.TreeSet; /** * Attempts to re-evaluate all the formulas in the workbook, and * reports what (if any) formula functions used are not (currently) * supported by Apache POI. * * <p>This provides examples of how to evaluate formulas in excel * files using Apache POI, along with how to handle errors whilst * doing so. */ public class CheckFunctionsSupported { public static void main(String[] args) throws Exception { if (args.length < 1) { System.err.println("Use:"); System.err.println(" CheckFunctionsSupported <filename>"); return; } Workbook wb = WorkbookFactory.create(new File(args[0])); CheckFunctionsSupported check = new CheckFunctionsSupported(wb); // Fetch all the problems List<FormulaEvaluationProblems> problems = new ArrayList<FormulaEvaluationProblems>(); for (int sn = 0; sn < wb.getNumberOfSheets(); sn++) { problems.add(check.getEvaluationProblems(sn)); } // Produce an overall summary Set<String> unsupportedFunctions = new TreeSet<String>(); for (FormulaEvaluationProblems p : problems) { unsupportedFunctions.addAll(p.unsupportedFunctions); } if (unsupportedFunctions.isEmpty()) { System.out.println("There are no unsupported formula functions used"); } else { System.out.println("Unsupported formula functions:"); for (String function : unsupportedFunctions) { System.out.println(" " + function); } System.out.println("Total unsupported functions = " + unsupportedFunctions.size()); } // Report sheet by sheet for (int sn = 0; sn < wb.getNumberOfSheets(); sn++) { String sheetName = wb.getSheetName(sn); FormulaEvaluationProblems probs = problems.get(sn); System.out.println(); System.out.println("Sheet = " + sheetName); if (probs.unevaluatableCells.isEmpty()) { System.out.println(" All cells evaluated without error"); } else { for (CellReference cr : probs.unevaluatableCells.keySet()) { System.out.println( " " + cr.formatAsString() + " - " + probs.unevaluatableCells.get(cr).toString()); } } } } private Workbook workbook; private FormulaEvaluator evaluator; public CheckFunctionsSupported(Workbook workbook) { this.workbook = workbook; this.evaluator = workbook.getCreationHelper().createFormulaEvaluator(); } public Set<String> getUnsupportedFunctions(String sheetName) { return getUnsupportedFunctions(workbook.getSheet(sheetName)); } public Set<String> getUnsupportedFunctions(int sheetIndex) { return getUnsupportedFunctions(workbook.getSheetAt(sheetIndex)); } public Set<String> getUnsupportedFunctions(Sheet sheet) { FormulaEvaluationProblems problems = getEvaluationProblems(sheet); return problems.unsupportedFunctions; } public FormulaEvaluationProblems getEvaluationProblems(String sheetName) { return getEvaluationProblems(workbook.getSheet(sheetName)); } public FormulaEvaluationProblems getEvaluationProblems(int sheetIndex) { return getEvaluationProblems(workbook.getSheetAt(sheetIndex)); } public FormulaEvaluationProblems getEvaluationProblems(Sheet sheet) { Set<String> unsupportedFunctions = new HashSet<String>(); Map<CellReference, Exception> unevaluatableCells = new HashMap<CellReference, Exception>(); for (Row r : sheet) { for (Cell c : r) { try { evaluator.evaluate(c); } catch (Exception e) { if (e instanceof NotImplementedException && e.getCause() != null) { // Has been wrapped with cell details, but we know those e = (Exception) e.getCause(); } /* remove by hebad start */ /*if (e instanceof NotImplementedFunctionException) { NotImplementedFunctionException nie = (NotImplementedFunctionException)e; unsupportedFunctions.add(nie.getFunctionName()); }*/ /* remove by hebad end */ unevaluatableCells.put(new CellReference(c), e); } } } return new FormulaEvaluationProblems(unsupportedFunctions, unevaluatableCells); } public static class FormulaEvaluationProblems { /** Which used functions are unsupported by POI at this time */ public Set<String> unsupportedFunctions; /** Which cells had unevaluatable formulas, and why? */ public Map<CellReference, Exception> unevaluatableCells; protected FormulaEvaluationProblems(Set<String> unsupportedFunctions, Map<CellReference, Exception> unevaluatableCells) { this.unsupportedFunctions = Collections.unmodifiableSet(unsupportedFunctions); this.unevaluatableCells = Collections.unmodifiableMap(unevaluatableCells); } } }