Renamed datagrid and datastore packages

net.onrc.onos.datagrid.* => net.onrc.onos.core.datagrid.*
net.onrc.onos.datastore.* => net.onrc.onos.core.datastore.*

Change-Id: Ibe1894a6fabae08ea7cfcbf6595f0c91b05ef497
diff --git a/src/main/java/net/onrc/onos/core/datastore/ObjectExistsException.java b/src/main/java/net/onrc/onos/core/datastore/ObjectExistsException.java
new file mode 100644
index 0000000..75c4e4d
--- /dev/null
+++ b/src/main/java/net/onrc/onos/core/datastore/ObjectExistsException.java
@@ -0,0 +1,25 @@
+package net.onrc.onos.core.datastore;
+
+import net.onrc.onos.core.datastore.utils.ByteArrayUtil;
+
+/**
+ * Exception thrown when object was not expected to be in data store.
+ */
+public class ObjectExistsException extends RejectRulesException {
+    private static final long serialVersionUID = -1488647215779909457L;
+
+    public ObjectExistsException(final String message) {
+        super(message);
+    }
+
+    public ObjectExistsException(final IKVTableID tableID, final byte[] key,
+            final Throwable cause) {
+        super(ByteArrayUtil.toHexStringBuffer(key, ":")
+                + " already exist on table:" + tableID, cause);
+    }
+
+    public ObjectExistsException(final IKVTableID tableID, final byte[] key) {
+        super(ByteArrayUtil.toHexStringBuffer(key, ":")
+                + " already exist on table:" + tableID);
+    }
+}