1 files changed, 53 insertions, 0 deletions
diff --git a/libccnx-common/ccnx/common/internal/ccnx_InterestInterface.c b/libccnx-common/ccnx/common/internal/ccnx_InterestInterface.c
new file mode 100755
index 00000000..a507d69d
--- /dev/null
+++ b/libccnx-common/ccnx/common/internal/ccnx_InterestInterface.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ */
+#include <config.h>
+
+#include <LongBow/runtime.h>
+
+#include <ccnx/common/internal/ccnx_InterestInterface.h>
+
+CCNxInterestInterface *
+ccnxInterestInterface_GetInterface(const CCNxTlvDictionary *dictionary)
+{
+    assertTrue((ccnxTlvDictionary_IsInterest(dictionary) ||
+                ccnxTlvDictionary_IsInterestReturn(dictionary)), "Expected an Interest or InterestReturn");
+
+    CCNxInterestInterface *impl = (CCNxInterestInterface *) ccnxTlvDictionary_GetMessageInterface(dictionary);
+
+    if (impl == NULL) {
+        // If we're here, we need to update the interface pointer.
+        // Figure out what the typeInterface should be, based on the attributes we know.
+        int schemaVersion = ccnxTlvDictionary_GetSchemaVersion(dictionary);
+
+        switch (schemaVersion) {
+            case CCNxTlvDictionary_SchemaVersion_V1:
+                impl = &CCNxInterestFacadeV1_Implementation;
+                break;
+            default:
+                trapUnexpectedState("Unknown SchemaVersion encountered in ccnxInterestInterface_GetInterface()");
+                break;
+        }
+
+        if (impl == NULL) {
+            // The cast to (CCNxTlvDictionary *) is to break the const.
+            ccnxTlvDictionary_SetMessageInterface((CCNxTlvDictionary *) dictionary, (CCNxMessageInterface *) impl);
+        }
+    }
+    return impl;
+}
+