Fix bug #56502 - When shifting XSSF rows with formula cells, if the formula can't be parsed, log + leave it unchanged rather than failing

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1614916 13f79535-47bb-0310-9956-ffa450edef68

src/ooxml/java/org/apache/poi/xssf/usermodel/helpers/XSSFRowShifter.java

@@ -20,6 +20,7 @@ package org.apache.poi.xssf.usermodel.helpers;
 import java.util.ArrayList;
 import java.util.List;
 
+import org.apache.poi.ss.formula.FormulaParseException;
 import org.apache.poi.ss.formula.FormulaParser;
 import org.apache.poi.ss.formula.FormulaRenderer;
 import org.apache.poi.ss.formula.FormulaShifter;
@@ -30,6 +31,8 @@ import org.apache.poi.ss.formula.ptg.Ptg;
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.Row;
 import org.apache.poi.ss.util.CellRangeAddress;
+import org.apache.poi.util.POILogFactory;
+import org.apache.poi.util.POILogger;
 import org.apache.poi.xssf.usermodel.XSSFCell;
 import org.apache.poi.xssf.usermodel.XSSFEvaluationWorkbook;
 import org.apache.poi.xssf.usermodel.XSSFName;
@@ -43,9 +46,10 @@ import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTConditionalFormatti
 import org.openxmlformats.schemas.spreadsheetml.x2006.main.STCellFormulaType;
 
 /**
- * @author Yegor Kozlov
+ * Helper for shifting rows up or down
  */
 public final class XSSFRowShifter {
+    private static POILogger logger = POILogFactory.getLogger(XSSFRowShifter.class);
     private final XSSFSheet sheet;
 
     public XSSFRowShifter(XSSFSheet sh) {
@@ -194,12 +198,19 @@ public final class XSSFRowShifter {
         XSSFWorkbook wb = sheet.getWorkbook();
         int sheetIndex = wb.getSheetIndex(sheet);
         XSSFEvaluationWorkbook fpb = XSSFEvaluationWorkbook.create(wb);
-        Ptg[] ptgs = FormulaParser.parse(formula, fpb, FormulaType.CELL, sheetIndex);
-        String shiftedFmla = null;
-        if (shifter.adjustFormula(ptgs, sheetIndex)) {
-            shiftedFmla = FormulaRenderer.toFormulaString(fpb, ptgs);
+        
+        try {
+            Ptg[] ptgs = FormulaParser.parse(formula, fpb, FormulaType.CELL, sheetIndex);
+            String shiftedFmla = null;
+            if (shifter.adjustFormula(ptgs, sheetIndex)) {
+                shiftedFmla = FormulaRenderer.toFormulaString(fpb, ptgs);
+            }
+            return shiftedFmla;
+        } catch (FormulaParseException fpe) {
+            // Log, but don't change, rather than breaking
+            logger.log(POILogger.WARN, "Error shifting formula on row ", row.getRowNum(), fpe);
+            return formula;
         }
-        return shiftedFmla;
     }
 
     public void updateConditionalFormatting(FormulaShifter shifter) {

src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFBugs.java

@@ -1787,6 +1787,10 @@ public final class TestXSSFBugs extends BaseTestBugzillaIssues {
         checkValue(excel, eval.getStringValue() + ".0");
     }
     
+    /**
+     * New hyperlink with no initial cell reference, still need
+     *  to be able to change it
+     */
     @Test
     public void testBug56527() {
         XSSFWorkbook wb = new XSSFWorkbook();
@@ -1816,6 +1820,30 @@ public final class TestXSSFBugs extends BaseTestBugzillaIssues {
         assertEquals(5, hyperlink.getLastRow());
         assertEquals(3, hyperlink.getLastColumn());
     }
+    
+    /**
+     * Shifting rows with a formula that references a 
+     * function in another file
+     */
+    @Test
+    public void bug56502() throws Exception {
+        Workbook wb = XSSFTestDataSamples.openSampleWorkbook("56502.xlsx");
+        Sheet sheet = wb.getSheetAt(0);
+       
+        Cell cFunc = sheet.getRow(3).getCell(0);
+        assertEquals("[1]!LUCANET(\"Ist\")", cFunc.getCellFormula());
+        Cell cRef = sheet.getRow(3).createCell(1);
+        cRef.setCellFormula("A3");
+        
+        // Shift it down one row
+        sheet.shiftRows(1, sheet.getLastRowNum(), 1);
+        
+        // Check the new formulas: Function won't change, Reference will
+        cFunc = sheet.getRow(4).getCell(0);
+        assertEquals("[1]!LUCANET(\"Ist\")", cFunc.getCellFormula());
+        cRef = sheet.getRow(4).getCell(1);
+        assertEquals("A4", cRef.getCellFormula());
+    }
 
     private void checkValue(XSSFWorkbook excel, String expect) {
         XSSFFormulaEvaluator evaluator = new XSSFFormulaEvaluator(excel);