VOM: Additions to allow uses to UT applications that use VOM

- find object by key
- compare objects

Change-Id: I36ec8612be9482bcef7ceced2a59f7403f77b3e8
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
diff --git a/src/vpp-api/vom/sub_interface.cpp b/src/vpp-api/vom/sub_interface.cpp
index ea7fa41..01f4a54 100644
--- a/src/vpp-api/vom/sub_interface.cpp
+++ b/src/vpp-api/vom/sub_interface.cpp
@@ -56,6 +56,13 @@
 {
 }
 
+bool
+sub_interface::operator==(const sub_interface& s) const
+{
+  return (interface::operator==(s) && (m_parent->key() == s.m_parent->key()) &&
+          (m_vlan == s.m_vlan));
+}
+
 std::string
 sub_interface::mk_name(const interface& parent, vlan_id_t vlan)
 {
@@ -88,10 +95,17 @@
 std::shared_ptr<interface>
 sub_interface::singular_i() const
 {
-  return m_db.find_or_add(name(), *this);
+  return m_db.find_or_add(key(), *this);
 }
+
+std::shared_ptr<sub_interface>
+sub_interface::find(const key_t& k)
+{
+  return std::dynamic_pointer_cast<sub_interface>(m_db.find(k));
 }
 
+}; // namespace VOM
+
 /*
  * fd.io coding-style-patch-verification: ON
  *