Bug 62906 and 63401: Ensure tables have an initial name which does not conflict with

existing names

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1861819 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -4097,6 +4097,10 @@ public class XSSFSheet extends POIXMLDocumentPart implements Sheet  {
 
     /**
      * Creates a new Table, and associates it with this Sheet.
+     * <p>
+     * The table is assigned a default display name (since 4.1.1) which can be overridden
+     * by calling {@code setDisplayName}.  The default display name is guaranteed to not conflict
+     * with the names of any {@code XSSFName} or {@code XSSFTable} in the workbook.
      *
      * @param tableArea
      *            the area that the table should cover, should not be null
@@ -4140,9 +4144,17 @@ public class XSSFSheet extends POIXMLDocumentPart implements Sheet  {
             table.setArea(tableArea);
         }
 
-        // Bug 62906: Must set a display name; can be overridden using setDisplayName
-        final String displayName = "Table" + tableNumber;
-        table.setDisplayName(displayName);
+        // Set the default name of the table.  This must not conflict with any defined names.
+        while(tableNumber<Integer.MAX_VALUE) {
+            final String displayName="Table"+tableNumber;
+            if(getWorkbook().getTable(displayName) == null &&
+                    getWorkbook().getName(displayName) == null) {
+                table.setDisplayName(displayName);
+                table.setName(displayName);
+                break;
+            }
+            ++tableNumber;
+        }
 
         return table;
     }

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

@@ -369,7 +369,7 @@ public class XSSFTable extends POIXMLDocumentPart implements Table {
      * @return the name of the Table, if set
      */
     public String getName() {
-        if (name == null) {
+        if (name == null && ctTable.getName() != null) {
             setName(ctTable.getName());
         }
         return name;

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

@@ -17,6 +17,7 @@
 
 package org.apache.poi.xssf.usermodel;
 
+import org.apache.poi.ss.SpreadsheetVersion;
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.util.AreaReference;
 import org.apache.poi.ss.util.CellReference;
@@ -35,6 +36,7 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Locale;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -587,4 +589,37 @@ public final class TestXSSFTable {
             table1.setDisplayName("");
         }
     }
+
+    /**
+     * Delete table2, and create a named range in sheet0; it should automatically be assigned the name "Table4"
+     */
+    @Test
+    public void testBug63401And62906() throws IOException {
+        try (XSSFWorkbook workbook = new XSSFWorkbook()) {
+            XSSFSheet sheet0 = workbook.createSheet();
+            XSSFTable table = addTable(sheet0, 3, 0, 2, 2);
+
+            final String procName = "testXSSFTableGetName";
+            final String name = table.getName();
+            System.out.println(String.format(Locale.ROOT, "%s: table.getName=%s", procName, name));
+        }
+    }
+
+    private static XSSFTable addTable(XSSFSheet sheet,int nRow, int nCol, int nNumRows, int nNumCols) {
+        for (int i = 0; i < nNumRows; i++) {
+            XSSFRow row = sheet.createRow(i + nRow);
+            for (int j = 0; j < nNumCols; j++) {
+                XSSFCell localXSSFCell = row.createCell(j + nCol);
+                if (i == 0) {
+                    localXSSFCell.setCellValue(String.format(Locale.ROOT, "Col%d", j + 1));
+                } else {
+                    localXSSFCell.setCellValue(String.format(Locale.ROOT, "(%d,%d)", i + 1, j + 1));
+                }
+            }
+        }
+        final CellReference upperLeft = new CellReference(nRow, nCol);
+        final CellReference lowerRight = new CellReference(nNumRows - 1, nNumCols - 1);
+        final AreaReference area = new AreaReference(upperLeft, lowerRight, SpreadsheetVersion.EXCEL2007);
+        return sheet.createTable(area);
+    }
 }