Add clone methods to DrawingRecord and AbstractEscherHolderRecord, which allows cloning of some sheets with drawing objects on them. Fixes bug #31795

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@610336 13f79535-47bb-0310-9956-ffa450edef68

src/documentation/content/xdocs/changes.xml

@@ -36,6 +36,7 @@
 
 		<!-- Don't forget to update status.xml too! -->
         <release version="3.0.2-FINAL" date="2008-??-??">
+            <action dev="POI-DEVELOPERS" type="fix">31795 - Support cloning of sheets with certain drawing objects on them</action>
             <action dev="POI-DEVELOPERS" type="fix">43902 - Don't consider merged regions when auto-sizing columns</action>
             <action dev="POI-DEVELOPERS" type="fix">42464 - Avoid "Expected ExpPtg to be converted from Shared to Non-Shared Formula" on large, formula heavy worksheets</action>
             <action dev="POI-DEVELOPERS" type="add">42033 - Add support for named ranges with unicode names</action>

src/documentation/content/xdocs/status.xml

@@ -33,6 +33,7 @@
 	<!-- Don't forget to update changes.xml too! -->
     <changes>
         <release version="3.0.2-FINAL" date="2008-??-??">
+            <action dev="POI-DEVELOPERS" type="fix">31795 - Support cloning of sheets with certain drawing objects on them</action>
             <action dev="POI-DEVELOPERS" type="fix">43902 - Don't consider merged regions when auto-sizing columns</action>
             <action dev="POI-DEVELOPERS" type="fix">42464 - Avoid "Expected ExpPtg to be converted from Shared to Non-Shared Formula" on large, formula heavy worksheets</action>
             <action dev="POI-DEVELOPERS" type="add">42033 - Add support for named ranges with unicode names</action>

src/java/org/apache/poi/hssf/record/AbstractEscherHolderRecord.java

@@ -24,6 +24,9 @@ import org.apache.poi.ddf.EscherRecordFactory;
 import org.apache.poi.ddf.NullEscherSerializationListener;
 import org.apache.poi.util.LittleEndian;
 
+import java.io.ByteArrayInputStream;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
@@ -76,7 +79,7 @@ public abstract class AbstractEscherHolderRecord
     {
         if (id != getSid())
         {
-            throw new RecordFormatException("Not an escher record");
+            throw new RecordFormatException("Not an escher record! (sid was " + id + ", expecting " + getSid() + ")");
         }
     }
 
@@ -227,7 +230,19 @@ public abstract class AbstractEscherHolderRecord
 
     public Object clone()
     {
-        throw new IllegalStateException("Not implemented yet.");
+    	// Do it via a re-serialise
+    	// It's a cheat, but it works...
+    	byte[] b = serialize();
+    	RecordInputStream rinp = new RecordInputStream(
+    			new ByteArrayInputStream(b)
+    	);
+    	rinp.nextRecord();
+
+    	Record[] r = RecordFactory.createRecord(rinp);
+    	if(r.length != 1) {
+    		throw new IllegalStateException("Re-serialised a record to clone it, but got " + r.length + " records back!");
+    	}
+    	return r[0];
     }
 
     public void addEscherRecord(int index, EscherRecord element)

src/java/org/apache/poi/hssf/record/DrawingRecord.java

@@ -107,15 +107,16 @@ public class DrawingRecord extends Record
     }
 
     public Object clone() {
-        if (recordData == null) {
-            recordData = new byte[ 0 ];
-        }
-        
     	DrawingRecord rec = new DrawingRecord();
+    	
+        if (recordData != null) {
         	rec.recordData = new byte[ recordData.length ];
-    	rec.contd = new byte[ contd.length ];
         	System.arraycopy(recordData, 0, rec.recordData, 0, recordData.length);
+        }
+    	if (contd != null) {
 	    	System.arraycopy(contd, 0, rec.contd, 0, contd.length);
+	    	rec.contd = new byte[ contd.length ];
+    	}
     	
     	return rec;
     }

src/testcases/org/apache/poi/hssf/usermodel/TestHSSFWorkbook.java

@@ -109,4 +109,24 @@ public class TestHSSFWorkbook extends TestCase
         assertEquals(b.getSelectedTab(), 1);
         assertEquals(b.getDisplayedTab(), 1);
     }
+    
+    public void testSheetClone() throws Exception {
+    	// First up, try a simple file
+        HSSFWorkbook b = new HSSFWorkbook();
+        assertEquals(0, b.getNumberOfSheets());
+        b.createSheet("Sheet One");
+        b.createSheet("Sheet Two");
+        
+        assertEquals(2, b.getNumberOfSheets());
+        b.cloneSheet(0);
+        assertEquals(3, b.getNumberOfSheets());
+    	
+    	// Now try a problem one with drawing records in it
+        b = new HSSFWorkbook(
+        		new FileInputStream(new File(filename,"SheetWithDrawing.xls"))
+        );
+        assertEquals(1, b.getNumberOfSheets());
+        b.cloneSheet(0);
+        assertEquals(2, b.getNumberOfSheets());
+    }
 }