diff --git a/src/java/org/apache/poi/ss/formula/ptg/ExternSheetNameResolver.java b/src/java/org/apache/poi/ss/formula/ptg/ExternSheetNameResolver.java
index be20167ed..a6cb76022 100644
--- a/src/java/org/apache/poi/ss/formula/ptg/ExternSheetNameResolver.java
+++ b/src/java/org/apache/poi/ss/formula/ptg/ExternSheetNameResolver.java
@@ -25,36 +25,35 @@ import org.apache.poi.ss.formula.SheetNameFormatter;
  * @author Josh Micich
  */
 final class ExternSheetNameResolver {
+    private ExternSheetNameResolver() {
+        // no instances of this class
+    }
 
-	private ExternSheetNameResolver() {
-		// no instances of this class
-	}
-
-	public static String prependSheetName(FormulaRenderingWorkbook book, int field_1_index_extern_sheet, String cellRefText) {
-		ExternalSheet externalSheet = book.getExternalSheet(field_1_index_extern_sheet);
-		StringBuffer sb;
-		if (externalSheet != null) {
-			String wbName = externalSheet.getWorkbookName();
-			String sheetName = externalSheet.getSheetName();
-			if (wbName != null) {
-    			sb = new StringBuffer(wbName.length() + sheetName.length() + cellRefText.length() + 4);
-    			SheetNameFormatter.appendFormat(sb, wbName, sheetName);
-			} else {
+    public static String prependSheetName(FormulaRenderingWorkbook book, int field_1_index_extern_sheet, String cellRefText) {
+        ExternalSheet externalSheet = book.getExternalSheet(field_1_index_extern_sheet);
+        StringBuffer sb;
+        if (externalSheet != null) {
+            String wbName = externalSheet.getWorkbookName();
+            String sheetName = externalSheet.getSheetName();
+            if (wbName != null) {
+                sb = new StringBuffer(wbName.length() + sheetName.length() + cellRefText.length() + 4);
+                SheetNameFormatter.appendFormat(sb, wbName, sheetName);
+            } else {
                 sb = new StringBuffer(sheetName.length() + cellRefText.length() + 4);
                 SheetNameFormatter.appendFormat(sb, sheetName);
-			}
-		} else {
-			String sheetName = book.getSheetNameByExternSheet(field_1_index_extern_sheet);
-			sb = new StringBuffer(sheetName.length() + cellRefText.length() + 4);
-			if (sheetName.length() < 1) {
-				// What excel does if sheet has been deleted
-				sb.append("#REF"); // note - '!' added just once below
-			} else {
-				SheetNameFormatter.appendFormat(sb, sheetName);
-			}
-		}
-   		sb.append('!');
-		sb.append(cellRefText);
-		return sb.toString();
-	}
+            }
+        } else {
+            String sheetName = book.getSheetNameByExternSheet(field_1_index_extern_sheet);
+            sb = new StringBuffer(sheetName.length() + cellRefText.length() + 4);
+            if (sheetName.length() < 1) {
+                // What excel does if sheet has been deleted
+                sb.append("#REF"); // note - '!' added just once below
+            } else {
+                SheetNameFormatter.appendFormat(sb, sheetName);
+            }
+        }
+        sb.append('!');
+        sb.append(cellRefText);
+        return sb.toString();
+    }
 }
diff --git a/src/testcases/org/apache/poi/hssf/eventusermodel/TestEventWorkbookBuilder.java b/src/testcases/org/apache/poi/hssf/eventusermodel/TestEventWorkbookBuilder.java
index e7869755a..1b02cf241 100644
--- a/src/testcases/org/apache/poi/hssf/eventusermodel/TestEventWorkbookBuilder.java
+++ b/src/testcases/org/apache/poi/hssf/eventusermodel/TestEventWorkbookBuilder.java
@@ -39,130 +39,130 @@ import org.apache.poi.ss.formula.ptg.Ref3DPtg;
  * Tests for {@link EventWorkbookBuilder}
  */
 public final class TestEventWorkbookBuilder extends TestCase {
-	private MockHSSFListener mockListen;
-	private SheetRecordCollectingListener listener;
+    private MockHSSFListener mockListen;
+    private SheetRecordCollectingListener listener;
 
-	@Override
-	public void setUp() {
-		HSSFRequest req = new HSSFRequest();
-		mockListen = new MockHSSFListener();
-		listener = new SheetRecordCollectingListener(mockListen);
-		req.addListenerForAllRecords(listener);
+    @Override
+    public void setUp() {
+        HSSFRequest req = new HSSFRequest();
+        mockListen = new MockHSSFListener();
+        listener = new SheetRecordCollectingListener(mockListen);
+        req.addListenerForAllRecords(listener);
 
-		HSSFEventFactory factory = new HSSFEventFactory();
-		try {
-			InputStream is = HSSFTestDataSamples.openSampleFileStream("3dFormulas.xls");
-			POIFSFileSystem fs = new POIFSFileSystem(is);
-			factory.processWorkbookEvents(req, fs);
-		} catch (IOException e) {
-			throw new RuntimeException(e);
-		}
-	}
+        HSSFEventFactory factory = new HSSFEventFactory();
+        try {
+            InputStream is = HSSFTestDataSamples.openSampleFileStream("3dFormulas.xls");
+            POIFSFileSystem fs = new POIFSFileSystem(is);
+            factory.processWorkbookEvents(req, fs);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
 
-	public void testBasics() {
-		assertNotNull(listener.getSSTRecord());
-		assertNotNull(listener.getBoundSheetRecords());
-		assertNotNull(listener.getExternSheetRecords());
-	}
+    public void testBasics() {
+        assertNotNull(listener.getSSTRecord());
+        assertNotNull(listener.getBoundSheetRecords());
+        assertNotNull(listener.getExternSheetRecords());
+    }
 
-	public void testGetStubWorkbooks() {
-		assertNotNull(listener.getStubWorkbook());
-		assertNotNull(listener.getStubHSSFWorkbook());
-	}
+    public void testGetStubWorkbooks() {
+        assertNotNull(listener.getStubWorkbook());
+        assertNotNull(listener.getStubHSSFWorkbook());
+    }
 
-	public void testContents() {
-		assertEquals(2, listener.getSSTRecord().getNumStrings());
-		assertEquals(3, listener.getBoundSheetRecords().length);
-		assertEquals(1, listener.getExternSheetRecords().length);
+    public void testContents() {
+        assertEquals(2, listener.getSSTRecord().getNumStrings());
+        assertEquals(3, listener.getBoundSheetRecords().length);
+        assertEquals(1, listener.getExternSheetRecords().length);
 
-		assertEquals(3, listener.getStubWorkbook().getNumSheets());
+        assertEquals(3, listener.getStubWorkbook().getNumSheets());
 
-		InternalWorkbook ref = listener.getStubWorkbook();
-		assertEquals("Sh3", ref.findSheetNameFromExternSheet(0));
-		assertEquals("Sheet1", ref.findSheetNameFromExternSheet(1));
-		assertEquals("S2", ref.findSheetNameFromExternSheet(2));
-	}
+        InternalWorkbook ref = listener.getStubWorkbook();
+        assertEquals("Sh3", ref.findSheetNameFromExternSheet(0));
+        assertEquals("Sheet1", ref.findSheetNameFromExternSheet(1));
+        assertEquals("S2", ref.findSheetNameFromExternSheet(2));
+    }
 
-	public void testFormulas() {
+    public void testFormulas() {
 
-		FormulaRecord[] fRecs = mockListen.getFormulaRecords();
+        FormulaRecord[] fRecs = mockListen.getFormulaRecords();
 
-		// Check our formula records
-		assertEquals(6, fRecs.length);
+        // Check our formula records
+        assertEquals(6, fRecs.length);
 
-		InternalWorkbook stubWB = listener.getStubWorkbook();
-		assertNotNull(stubWB);
-		HSSFWorkbook stubHSSF = listener.getStubHSSFWorkbook();
-		assertNotNull(stubHSSF);
+        InternalWorkbook stubWB = listener.getStubWorkbook();
+        assertNotNull(stubWB);
+        HSSFWorkbook stubHSSF = listener.getStubHSSFWorkbook();
+        assertNotNull(stubHSSF);
 
-		// Check these stubs have the right stuff on them
-		assertEquals("Sheet1", stubWB.getSheetName(0));
+        // Check these stubs have the right stuff on them
+        assertEquals("Sheet1", stubWB.getSheetName(0));
         assertEquals("Sheet1", stubHSSF.getSheetName(0));
-		assertEquals("S2",     stubWB.getSheetName(1));
+        assertEquals("S2",     stubWB.getSheetName(1));
         assertEquals("S2",     stubHSSF.getSheetName(1));
-		assertEquals("Sh3",    stubWB.getSheetName(2));
+        assertEquals("Sh3",    stubWB.getSheetName(2));
         assertEquals("Sh3",    stubHSSF.getSheetName(2));
 
-		// Check we can get the formula without breaking
-		for(int i=0; i<fRecs.length; i++) {
-			HSSFFormulaParser.toFormulaString(stubHSSF, fRecs[i].getParsedExpression());
-		}
+        // Check we can get the formula without breaking
+        for(int i=0; i<fRecs.length; i++) {
+            HSSFFormulaParser.toFormulaString(stubHSSF, fRecs[i].getParsedExpression());
+        }
 
-		// Peer into just one formula, and check that
-		//  all the ptgs give back the right things
-		Ptg[] ptgs = fRecs[0].getParsedExpression();
-		assertEquals(1, ptgs.length);
-		assertTrue(ptgs[0] instanceof Ref3DPtg);
+        // Peer into just one formula, and check that
+        //  all the ptgs give back the right things
+        Ptg[] ptgs = fRecs[0].getParsedExpression();
+        assertEquals(1, ptgs.length);
+        assertTrue(ptgs[0] instanceof Ref3DPtg);
 
-		Ref3DPtg ptg = (Ref3DPtg)ptgs[0];
-		HSSFEvaluationWorkbook book = HSSFEvaluationWorkbook.create(stubHSSF);
-		assertEquals("Sheet1!A1", ptg.toFormulaString(book));
+        Ref3DPtg ptg = (Ref3DPtg)ptgs[0];
+        HSSFEvaluationWorkbook book = HSSFEvaluationWorkbook.create(stubHSSF);
+        assertEquals("Sheet1!A1", ptg.toFormulaString(book));
 
 
-		// Now check we get the right formula back for
-		//  a few sample ones
-		FormulaRecord fr;
+        // Now check we get the right formula back for
+        //  a few sample ones
+        FormulaRecord fr;
 
-		// Sheet 1 A2 is on same sheet
-		fr = fRecs[0];
-		assertEquals(1, fr.getRow());
-		assertEquals(0, fr.getColumn());
-		assertEquals("Sheet1!A1", HSSFFormulaParser.toFormulaString(stubHSSF, fr.getParsedExpression()));
+        // Sheet 1 A2 is on same sheet
+        fr = fRecs[0];
+        assertEquals(1, fr.getRow());
+        assertEquals(0, fr.getColumn());
+        assertEquals("Sheet1!A1", HSSFFormulaParser.toFormulaString(stubHSSF, fr.getParsedExpression()));
 
-		// Sheet 1 A5 is to another sheet
-		fr = fRecs[3];
-		assertEquals(4, fr.getRow());
-		assertEquals(0, fr.getColumn());
-		assertEquals("'S2'!A1", HSSFFormulaParser.toFormulaString(stubHSSF, fr.getParsedExpression()));
+        // Sheet 1 A5 is to another sheet
+        fr = fRecs[3];
+        assertEquals(4, fr.getRow());
+        assertEquals(0, fr.getColumn());
+        assertEquals("'S2'!A1", HSSFFormulaParser.toFormulaString(stubHSSF, fr.getParsedExpression()));
 
-		// Sheet 1 A7 is to another sheet, range
-		fr = fRecs[5];
-		assertEquals(6, fr.getRow());
-		assertEquals(0, fr.getColumn());
-		assertEquals("SUM(Sh3!A1:A4)", HSSFFormulaParser.toFormulaString(stubHSSF, fr.getParsedExpression()));
+        // Sheet 1 A7 is to another sheet, range
+        fr = fRecs[5];
+        assertEquals(6, fr.getRow());
+        assertEquals(0, fr.getColumn());
+        assertEquals("SUM(Sh3!A1:A4)", HSSFFormulaParser.toFormulaString(stubHSSF, fr.getParsedExpression()));
 
 
-		// Now, load via Usermodel and re-check
-		HSSFWorkbook wb = HSSFTestDataSamples.openSampleWorkbook("3dFormulas.xls");
-		assertEquals("Sheet1!A1", wb.getSheetAt(0).getRow(1).getCell(0).getCellFormula());
-		assertEquals("SUM(Sh3!A1:A4)", wb.getSheetAt(0).getRow(6).getCell(0).getCellFormula());
-	}
+        // Now, load via Usermodel and re-check
+        HSSFWorkbook wb = HSSFTestDataSamples.openSampleWorkbook("3dFormulas.xls");
+        assertEquals("Sheet1!A1", wb.getSheetAt(0).getRow(1).getCell(0).getCellFormula());
+        assertEquals("SUM(Sh3!A1:A4)", wb.getSheetAt(0).getRow(6).getCell(0).getCellFormula());
+    }
 
-	private static final class MockHSSFListener implements HSSFListener {
-		public MockHSSFListener() {}
-		private final List<Record> _records = new ArrayList<Record>();
-		private final List<Record> _frecs = new ArrayList<Record>();
+    private static final class MockHSSFListener implements HSSFListener {
+        public MockHSSFListener() {}
+        private final List<Record> _records = new ArrayList<Record>();
+        private final List<Record> _frecs = new ArrayList<Record>();
 
-		public void processRecord(Record record) {
-			_records.add(record);
-			if(record instanceof FormulaRecord) {
-				_frecs.add(record);
-			}
-		}
-		public FormulaRecord[] getFormulaRecords() {
-			FormulaRecord[] result = new FormulaRecord[_frecs.size()];
-			_frecs.toArray(result);
-			return result;
-		}
-	}
+        public void processRecord(Record record) {
+            _records.add(record);
+            if(record instanceof FormulaRecord) {
+                _frecs.add(record);
+            }
+        }
+        public FormulaRecord[] getFormulaRecords() {
+            FormulaRecord[] result = new FormulaRecord[_frecs.size()];
+            _frecs.toArray(result);
+            return result;
+        }
+    }
 }