Add some helper methods for working with attachments

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1359542 13f79535-47bb-0310-9956-ffa450edef68

src/scratchpad/src/org/apache/poi/hsmf/datatypes/AttachmentChunks.java

@@ -31,10 +31,13 @@ import static org.apache.poi.hsmf.datatypes.MAPIProperty.ATTACH_MIME_TAG;
 import static org.apache.poi.hsmf.datatypes.MAPIProperty.ATTACH_RENDERING;
 import static org.apache.poi.hsmf.datatypes.MAPIProperty.ATTACH_SIZE;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
 
+import org.apache.poi.hsmf.MAPIMessage;
+
 /**
  * Collection of convenence chunks for standard parts of the MSG file attachment.
  */
@@ -68,6 +71,36 @@ public class AttachmentChunks implements ChunkGroup {
       this.poifsName = poifsName;
    }
    
+   
+   /**
+    * Is this Attachment an embedded MAPI message?
+    */
+   public boolean isEmbeddedMessage() {
+      return (attachmentDirectory != null);
+   }
+   /**
+    * Returns the embedded MAPI message, if the attachment
+    *  is an embedded message, or null otherwise
+    */
+   public MAPIMessage getEmbeddedMessage() throws IOException {
+      if (attachmentDirectory != null) {
+         return attachmentDirectory.getAsEmbededMessage();
+      }
+      return null;
+   }
+   
+   /**
+    * Returns the embedded object, if the attachment is an
+    *  object based embedding (image, document etc), or null
+    *  if it's an embedded message
+    */
+   public byte[] getEmbeddedAttachmentObject() {
+      if (attachData != null) {
+         return attachData.getValue();
+      }
+      return null;
+   }
+   
    public Chunk[] getAll() {
       return allChunks.toArray(new Chunk[allChunks.size()]);
    }