More fixes for Cell.setCellType() when converting from CELL_TYPE_FORMULA to CELL_TYPE_STRING. Similar to issues fixed with bugzilla 46479.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@886951 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/usermodel/HSSFCell.java

@@ -50,6 +50,7 @@ import org.apache.poi.ss.usermodel.CellStyle;
 import org.apache.poi.ss.usermodel.Comment;
 import org.apache.poi.ss.usermodel.Hyperlink;
 import org.apache.poi.ss.usermodel.RichTextString;
+import org.apache.poi.ss.util.NumberToTextConverter;
 import org.apache.poi.ss.formula.FormulaType;
 import org.apache.poi.ss.SpreadsheetVersion;
 import org.apache.poi.util.POILogger;
@@ -811,14 +812,29 @@ public class HSSFCell implements Cell {
                 int sstIndex = ((LabelSSTRecord)_record).getSSTIndex();
                 return _book.getWorkbook().getSSTString(sstIndex).getString();
             case CELL_TYPE_NUMERIC:
-                return String.valueOf(((NumberRecord)_record).getValue());
+                return NumberToTextConverter.toText(((NumberRecord)_record).getValue());
             case CELL_TYPE_ERROR:
                    return HSSFErrorConstants.getText(((BoolErrRecord) _record).getErrorValue());
             case CELL_TYPE_FORMULA:
                 // should really evaluate, but HSSFCell can't call HSSFFormulaEvaluator
-                return "";
+                // just use cached formula result instead
+                break;
+            default:
+                throw new IllegalStateException("Unexpected cell type (" + _cellType + ")");
         }
-        throw new RuntimeException("Unexpected cell type (" + _cellType + ")");
+        FormulaRecordAggregate fra = ((FormulaRecordAggregate)_record);
+        FormulaRecord fr = fra.getFormulaRecord();
+        switch (fr.getCachedResultType()) {
+            case CELL_TYPE_BOOLEAN:
+                return fr.getCachedBooleanValue() ? "TRUE" : "FALSE";
+            case CELL_TYPE_STRING:
+                return fra.getStringValue();
+            case CELL_TYPE_NUMERIC:
+                return NumberToTextConverter.toText(fr.getValue());
+            case CELL_TYPE_ERROR:
+                   return HSSFErrorConstants.getText(fr.getCachedErrorValue());
+        }
+        throw new IllegalStateException("Unexpected formula result type (" + _cellType + ")");
     }
 
     /**

src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFCell.java

@@ -271,6 +271,7 @@ public final class XSSFCell implements Cell {
                 }
                 break;
             case CELL_TYPE_FORMULA:
+                checkFormulaCachedValueType(CELL_TYPE_STRING, getBaseCellType(false));
                 rt = new XSSFRichTextString(_cell.isSetV() ? _cell.getV() : "");
                 break;
             default:
@@ -280,6 +281,12 @@ public final class XSSFCell implements Cell {
         return rt;
     }
 
+    private static void checkFormulaCachedValueType(int expectedTypeCode, int cachedValueType) {
+        if (cachedValueType != expectedTypeCode) {
+            throw typeMismatch(expectedTypeCode, cachedValueType, true);
+        }
+	}
+
 	/**
      * Set a string value for the cell.
      *
@@ -697,6 +704,9 @@ public final class XSSFCell implements Cell {
             default:
                 throw new IllegalArgumentException("Illegal cell type: " + cellType);
         }
+        if (cellType != CELL_TYPE_FORMULA && _cell.isSetF()) {
+			_cell.unsetF();
+		}
     }
 
     /**
@@ -903,14 +913,32 @@ public final class XSSFCell implements Cell {
                 XSSFRichTextString rt = new XSSFRichTextString(_sharedStringSource.getEntryAt(sstIndex));
                 return rt.getString();
             case CELL_TYPE_NUMERIC:
-                return String.valueOf(Double.parseDouble(_cell.getV()));
             case CELL_TYPE_ERROR:
                 return _cell.getV();
             case CELL_TYPE_FORMULA:
                 // should really evaluate, but HSSFCell can't call HSSFFormulaEvaluator
-                return "";
+                // just use cached formula result instead
+                break;
+            default:
+                throw new IllegalStateException("Unexpected cell type (" + cellType + ")");
         }
-        throw new RuntimeException("Unexpected cell type (" + cellType + ")");
+        cellType = getBaseCellType(false);
+        String textValue = _cell.getV();
+        switch (cellType) {
+            case CELL_TYPE_BOOLEAN:
+                if (TRUE_AS_STRING.equals(textValue)) {
+                    return "TRUE";
+                }
+                if (FALSE_AS_STRING.equals(textValue)) {
+                    return "FALSE";
+                }
+                throw new IllegalStateException("Unexpected boolean cached formula value '"
+                    + textValue + "'.");
+            case CELL_TYPE_STRING:
+            case CELL_TYPE_NUMERIC:
+            case CELL_TYPE_ERROR:
+                return textValue;
+        }
+        throw new IllegalStateException("Unexpected formula result type (" + cellType + ")");
     }
-
 }

src/testcases/org/apache/poi/ss/usermodel/BaseTestCell.java

@@ -102,27 +102,24 @@ public abstract class BaseTestCell extends TestCase {
 				switch (type) {
 					case Cell.CELL_TYPE_NUMERIC:
 						cell.getNumericCellValue();
-						fail();
 						break;
 					case Cell.CELL_TYPE_STRING:
 						cell.getStringCellValue();
-						fail();
 						break;
 					case Cell.CELL_TYPE_BOOLEAN:
 						cell.getBooleanCellValue();
-						fail();
 						break;
 					case Cell.CELL_TYPE_FORMULA:
 						cell.getCellFormula();
-						fail();
 						break;
 					case Cell.CELL_TYPE_ERROR:
 						cell.getErrorCellValue();
-						fail();
 						break;
 				}
+				fail("Should get exception when reading cell type (" + type + ").");
 			} catch (IllegalStateException e){
-				;
+				// expected during successful test
+				assertTrue(e.getMessage().startsWith("Cannot get a"));
 			}
 		}
 	}
@@ -346,6 +343,73 @@ public abstract class BaseTestCell extends TestCase {
 		assertEquals(true, cell.getBooleanCellValue());
 	}
 
+	/**
+	 * Test for a bug observed around svn r886733 when using
+	 * {@link FormulaEvaluator#evaluateInCell(Cell)} with a
+	 * string result type.
+	 */
+	public final void testConvertStringFormulaCell() {
+		Cell cellA1 = createACell();
+		cellA1.setCellFormula("\"abc\"");
+
+		// default cached formula result is numeric zero
+		assertEquals(0.0, cellA1.getNumericCellValue(), 0.0);
+
+		FormulaEvaluator fe = cellA1.getSheet().getWorkbook().getCreationHelper().createFormulaEvaluator();
+
+		fe.evaluateFormulaCell(cellA1);
+		assertEquals("abc", cellA1.getStringCellValue());
+
+		fe.evaluateInCell(cellA1);
+		if (cellA1.getStringCellValue().equals("")) {
+			throw new AssertionFailedError("Identified bug with writing back formula result of type string");
+		}
+		assertEquals("abc", cellA1.getStringCellValue());
+	}
+	/**
+	 * similar to {@link #testConvertStringFormulaCell()} but  checks at a
+	 * lower level that {#link {@link Cell#setCellType(int)} works properly
+	 */
+	public final void testSetTypeStringOnFormulaCell() {
+		Cell cellA1 = createACell();
+		FormulaEvaluator fe = cellA1.getSheet().getWorkbook().getCreationHelper().createFormulaEvaluator();
+
+		cellA1.setCellFormula("\"DEF\"");
+		fe.clearAllCachedResultValues();
+		fe.evaluateFormulaCell(cellA1);
+		assertEquals("DEF", cellA1.getStringCellValue());
+		cellA1.setCellType(Cell.CELL_TYPE_STRING);
+		assertEquals("DEF", cellA1.getStringCellValue());
+
+		cellA1.setCellFormula("25.061");
+		fe.clearAllCachedResultValues();
+		fe.evaluateFormulaCell(cellA1);
+		confirmCannotReadString(cellA1);
+		assertEquals(25.061, cellA1.getNumericCellValue(), 0.0);
+		cellA1.setCellType(Cell.CELL_TYPE_STRING);
+		assertEquals("25.061", cellA1.getStringCellValue());
+
+		cellA1.setCellFormula("TRUE");
+		fe.clearAllCachedResultValues();
+		fe.evaluateFormulaCell(cellA1);
+		confirmCannotReadString(cellA1);
+		assertEquals(true, cellA1.getBooleanCellValue());
+		cellA1.setCellType(Cell.CELL_TYPE_STRING);
+		assertEquals("TRUE", cellA1.getStringCellValue());
+
+		cellA1.setCellFormula("#NAME?");
+		fe.clearAllCachedResultValues();
+		fe.evaluateFormulaCell(cellA1);
+		confirmCannotReadString(cellA1);
+		assertEquals(ErrorConstants.ERROR_NAME, cellA1.getErrorCellValue());
+		cellA1.setCellType(Cell.CELL_TYPE_STRING);
+		assertEquals("#NAME?", cellA1.getStringCellValue());
+	}
+
+	private static void confirmCannotReadString(Cell cell) {
+		assertProhibitedValueAccess(cell, Cell.CELL_TYPE_STRING);
+	}
+
 	/**
 	 * Test for bug in convertCellValueToBoolean to make sure that formula results get converted
 	 */