more progress with merging external slides

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1225169 13f79535-47bb-0310-9956-ffa450edef68

src/ooxml/java/org/apache/poi/xslf/usermodel/XSLFGroupShape.java

@@ -25,6 +25,7 @@ import org.apache.poi.openxml4j.opc.TargetMode;
 import org.apache.poi.util.Beta;
 import org.apache.poi.util.Units;
 import org.apache.xmlbeans.XmlObject;
+import org.openxmlformats.schemas.drawingml.x2006.main.CTBlip;
 import org.openxmlformats.schemas.drawingml.x2006.main.CTGroupShapeProperties;
 import org.openxmlformats.schemas.drawingml.x2006.main.CTGroupTransform2D;
 import org.openxmlformats.schemas.drawingml.x2006.main.CTNonVisualDrawingProps;
@@ -33,6 +34,7 @@ import org.openxmlformats.schemas.drawingml.x2006.main.CTPositiveSize2D;
 import org.openxmlformats.schemas.presentationml.x2006.main.CTConnector;
 import org.openxmlformats.schemas.presentationml.x2006.main.CTGroupShape;
 import org.openxmlformats.schemas.presentationml.x2006.main.CTGroupShapeNonVisual;
+import org.openxmlformats.schemas.presentationml.x2006.main.CTPicture;
 import org.openxmlformats.schemas.presentationml.x2006.main.CTShape;
 
 import java.awt.Graphics2D;
@@ -309,4 +311,18 @@ public class XSLFGroupShape extends XSLFShape {
         
     }
 
+    @Override
+    void copy(XSLFShape src){
+        XSLFGroupShape gr = (XSLFGroupShape)src;
+        // recursively update each shape
+        XSLFShape[] tgtShapes = getShapes();
+        XSLFShape[] srcShapes = gr.getShapes();
+        for(int i = 0; i < tgtShapes.length; i++){
+            XSLFShape s1 = srcShapes[i];
+            XSLFShape s2 = tgtShapes[i];
+
+            s2.copy(s1);
+        }
+    }
+
 }

src/ooxml/java/org/apache/poi/xslf/usermodel/XSLFSheet.java

@@ -286,8 +286,9 @@ public abstract class XSLFSheet extends POIXMLDocumentPart implements Iterable<X
         _shapes = null;
         _spTree = null;
         _drawing = null;
+        _spTree = null;
         // first copy the source xml
-        getXmlObject().set(src.getXmlObject());
+        getSpTree().set(src.getSpTree());
 
         // recursively update each shape
         List<XSLFShape> tgtShapes = getShapeList();
@@ -302,10 +303,52 @@ public abstract class XSLFSheet extends POIXMLDocumentPart implements Iterable<X
     }
 
     /**
+     * Append content to this sheet.
+     *
+     * @param src the source sheet
+     * @return modified <code>this</code>.
+     */
+    public XSLFSheet appendContent(XSLFSheet src){
+        CTGroupShape spTree = getSpTree();
+        int numShapes = getShapeList().size();
+
+        CTGroupShape srcTree = src.getSpTree();
+        for(XmlObject ch : srcTree.selectPath("*")){
+            if(ch instanceof CTShape){ // simple shape
+                spTree.addNewSp().set(ch);
+            } else if (ch instanceof CTGroupShape){
+                spTree.addNewGrpSp().set(ch);
+            } else if (ch instanceof CTConnector){
+                spTree.addNewCxnSp().set(ch);
+            } else if (ch instanceof CTPicture){
+                spTree.addNewPic().set(ch);
+            } else if (ch instanceof CTGraphicalObjectFrame){
+                spTree.addNewGraphicFrame().set(ch);
+            }
+        }
+
+        _shapes = null;
+        _spTree = null;
+        _drawing = null;
+        _spTree = null;
+
+        // recursively update each shape
+        List<XSLFShape> tgtShapes = getShapeList();
+        List<XSLFShape> srcShapes = src.getShapeList();
+        for(int i = 0; i < srcShapes.size(); i++){
+            XSLFShape s1 = srcShapes.get(i);
+            XSLFShape s2 = tgtShapes.get(numShapes + i);
+
+            s2.copy(s1);
+        }
+        return this;
+    }
+
+   /**
      * @return theme (shared styles) associated with this theme.
      *  By default returns <code>null</code> which means that this sheet is theme-less.
      *  Sheets that support the notion of themes (slides, masters, layouts, etc.) should override this
-     *  method and return the corresposnding package part.
+     *  method and return the corresponding package part.
      */
     XSLFTheme getTheme(){
     	return null;

src/ooxml/java/org/apache/poi/xslf/usermodel/XSLFSlide.java

@@ -225,8 +225,9 @@ public final class XSLFSlide extends XSLFSheet {
     public XSLFSlide importContent(XSLFSheet src){
         super.importContent(src);
 
-        CTBackground bg = ((CTSlide)src.getXmlObject()).getCSld().getBg();
+        XSLFBackground bgShape = getBackground();
-        if(bg != null) {
+        if(bgShape != null) {
+            CTBackground bg = (CTBackground)bgShape.getXmlObject();
             if(bg.isSetBgPr() && bg.getBgPr().isSetBlipFill()){
                 CTBlip blip = bg.getBgPr().getBlipFill().getBlip();
                 String blipId = blip.getEmbed();