While working on bug 61148 I found that getCellType() and setCellErrorValue() in SXSSFCell are doing different things than the ones in XSSFCell, tried to fix this by mimicking functionality of XSSF in SXSSF as well.

Reformating some small things as well.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1808874 13f79535-47bb-0310-9956-ffa450edef68

src/ooxml/java/org/apache/poi/xssf/streaming/SXSSFCell.java

@@ -124,14 +124,21 @@ public class SXSSFCell implements Cell {
         ensureType(cellType);
     }
 
+    private boolean isFormulaCell() {
+        return _value instanceof FormulaValue;
+    }
+
     /**
      * Return the cell type.
      *
      * @return the cell type
      */
     @Override
-    public CellType getCellType()
-    {
+    public CellType getCellType() {
+        if (isFormulaCell()) {
+            return CellType.FORMULA;
+        }
+
         return _value.getType();
     }
     
@@ -158,7 +165,7 @@ public class SXSSFCell implements Cell {
      */
     @Override
     public CellType getCachedFormulaResultType() {
-        if (_value.getType() != CellType.FORMULA) {
+        if (!isFormulaCell()) {
             throw new IllegalStateException("Only formula cells have cached results");
         }
 
@@ -497,13 +504,18 @@ public class SXSSFCell implements Cell {
      * @see org.apache.poi.ss.usermodel.FormulaError
      */
     @Override
-    public void setCellErrorValue(byte value)
-    {
-        ensureType(CellType.ERROR);
-        if(_value.getType()==CellType.FORMULA)
-            ((ErrorFormulaValue)_value).setPreEvaluatedValue(value);
-        else
-            ((ErrorValue)_value).setValue(value);
+    public void setCellErrorValue(byte value) {
+        // for formulas, we want to keep the type and only have an ERROR as formula value
+        if(_value.getType()==CellType.FORMULA) {
+            // ensure that the type is "ERROR"
+            setFormulaType(CellType.ERROR);
+
+            // populate the value
+            ((ErrorFormulaValue) _value).setPreEvaluatedValue(value);
+        } else {
+            ensureType(CellType.ERROR);
+            ((ErrorValue) _value).setValue(value);
+        }
     }
 
     /**
@@ -827,13 +839,13 @@ public class SXSSFCell implements Cell {
     {
         if(_value.getType()!=CellType.STRING
            ||((StringValue)_value).isRichText())
-            _value=new PlainStringValue();
+            _value = new PlainStringValue();
     }
     /*package*/ void ensureRichTextStringType()
     {
         if(_value.getType()!=CellType.STRING
            ||!((StringValue)_value).isRichText())
-            _value=new RichTextValue();
+            _value = new RichTextValue();
     }
     /*package*/ void ensureType(CellType type)
     {
@@ -879,7 +891,7 @@ public class SXSSFCell implements Cell {
         {
             case NUMERIC:
             {
-                _value=new NumericValue();
+                _value = new NumericValue();
                 break;
             }
             case STRING:
@@ -895,12 +907,12 @@ public class SXSSFCell implements Cell {
             }
             case FORMULA:
             {
-                _value=new NumericFormulaValue();
+                _value = new NumericFormulaValue();
                 break;
             }
             case BLANK:
             {
-                _value=new BlankValue();
+                _value = new BlankValue();
                 break;
             }
             case BOOLEAN:
@@ -916,7 +928,7 @@ public class SXSSFCell implements Cell {
             }
             case ERROR:
             {
-                _value=new ErrorValue();
+                _value = new ErrorValue();
                 break;
             }
             default:
@@ -932,22 +944,22 @@ public class SXSSFCell implements Cell {
         {
             case NUMERIC:
             {
-                _value=new NumericFormulaValue();
+                _value = new NumericFormulaValue();
                 break;
             }
             case STRING:
             {
-                _value=new StringFormulaValue();
+                _value = new StringFormulaValue();
                 break;
             }
             case BOOLEAN:
             {
-                _value=new BooleanFormulaValue();
+                _value = new BooleanFormulaValue();
                 break;
             }
             case ERROR:
             {
-                _value=new ErrorFormulaValue();
+                _value = new ErrorFormulaValue();
                 break;
             }
             default:
@@ -1041,12 +1053,12 @@ public class SXSSFCell implements Cell {
         Property _next;
         public Property(Object value)
         {
-            _value=value;
+            _value = value;
         }
         abstract int getType();
         void setValue(Object value)
         {
-            _value=value;
+            _value = value;
         }
         Object getValue()
         {
@@ -1090,7 +1102,7 @@ public class SXSSFCell implements Cell {
         }
         void setValue(double value)
         {
-            _value=value;
+            _value = value;
         }
         double getValue()
         {
@@ -1111,7 +1123,7 @@ public class SXSSFCell implements Cell {
         String _value;
         void setValue(String value)
         {
-            _value=value;
+            _value = value;
         }
         String getValue()
         {
@@ -1133,7 +1145,7 @@ public class SXSSFCell implements Cell {
         }
         void setValue(RichTextString value)
         {
-            _value=value;
+            _value = value;
         }
         RichTextString getValue()
         {
@@ -1154,7 +1166,7 @@ public class SXSSFCell implements Cell {
         }
         void setValue(String value)
         {
-            _value=value;
+            _value = value;
         }
         String getValue()
         {
@@ -1246,7 +1258,7 @@ public class SXSSFCell implements Cell {
         }
         void setValue(boolean value)
         {
-            _value=value;
+            _value = value;
         }
         boolean getValue()
         {
@@ -1262,7 +1274,7 @@ public class SXSSFCell implements Cell {
         }
         void setValue(byte value)
         {
-            _value=value;
+            _value = value;
         }
         byte getValue()
         {

src/ooxml/testcases/org/apache/poi/xssf/streaming/TestSXSSFCell.java

@@ -20,6 +20,7 @@
 package org.apache.poi.xssf.streaming;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 
 import java.io.IOException;
 
@@ -71,6 +72,7 @@ public class TestSXSSFCell extends BaseTestXCell {
             XSSFCell xCell = xwb.getSheetAt(0).getRow(0).getCell(0);
 
             CTRst is = xCell.getCTCell().getIs();
+            assertNotNull(is);
             XmlCursor c = is.newCursor();
             c.toNextToken();
             String t = c.getAttributeText(new QName("http://www.w3.org/XML/1998/namespace", "space"));

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

@@ -1014,4 +1014,46 @@ public abstract class BaseTestCell {
 
         wb.close();
     }
+
+    @Test
+    public void testSetErrorValue() throws Exception {
+        try (Workbook wb = _testDataProvider.createWorkbook()) {
+            Sheet sheet = wb.createSheet();
+            Row row = sheet.createRow(0);
+            Cell cell = row.createCell(0);
+
+            cell.setCellFormula("A2");
+            cell.setCellErrorValue(FormulaError.NAME.getCode());
+
+            assertEquals(CellType.FORMULA, cell.getCellType());
+            assertEquals(CellType.ERROR, cell.getCachedFormulaResultType());
+            assertEquals("A2", cell.getCellFormula());
+            try {
+                cell.getNumericCellValue();
+                fail("Should catch exception here");
+            } catch (IllegalStateException e) {
+                // expected here
+            }
+            try {
+                cell.getStringCellValue();
+                fail("Should catch exception here");
+            } catch (IllegalStateException e) {
+                // expected here
+            }
+            try {
+                cell.getRichStringCellValue();
+                fail("Should catch exception here");
+            } catch (IllegalStateException e) {
+                // expected here
+            }
+            try {
+                cell.getDateCellValue();
+                fail("Should catch exception here");
+            } catch (IllegalStateException e) {
+                // expected here
+            }
+            assertEquals(FormulaError.NAME.getCode(), cell.getErrorCellValue());
+            assertNull(cell.getHyperlink());
+        }
+    }
 }