added getter of shardname and checking for only numbers and chars in

shardname

java/com.sap.sse.landscape.aws/src/com/sap/sse/landscape/aws/ShardNameDTO.java

@@ -36,6 +36,10 @@ public class ShardNameDTO {
     }
     
     public static ShardNameDTO create(String replicaSetName, String shardname) throws Exception {
+        if(!shardname.matches("[a-zA-Z0-9]*")) {
+            throw new Exception("Only a-z, A-Z and 0-9 characters are allowed in shardname!");
+        }
+        
         final String name;
         // "S-" "-" "-"
         if (TargetGroup.SAILING_TARGET_GROUP_NAME_PREFIX.length() + 1 + replicaSetName.length() + 1
@@ -63,6 +67,10 @@ public class ShardNameDTO {
         return targetGroupname;
     }
     
+    public String getShardName() {
+        return shardName;
+    }
+    
     public static boolean isValidTargetGroupName(String name) {
         boolean ret = true;
         if(