[VOL-4707] Expose programmed subscribers via REST and move classes and interfaces to the API.

Change-Id: Ibfb9caa48455fd349932297cb9191ee0f0341ffa
Signed-off-by: Gustavo Silva <gsilva@furukawalatam.com>
diff --git a/api/src/main/java/org/opencord/olt/FlowOperation.java b/api/src/main/java/org/opencord/olt/FlowOperation.java
new file mode 100644
index 0000000..3ad25a5
--- /dev/null
+++ b/api/src/main/java/org/opencord/olt/FlowOperation.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2022-present Open Networking Foundation
+ *
+ * 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.
+ */
+package org.opencord.olt;
+
+/**
+ * Enumerates the flow operations.
+ */
+public enum FlowOperation {
+    /**
+     * Flow addition op.
+     */
+    ADD,
+    /**
+     * Flow removal op.
+     */
+    REMOVE;
+
+    @Override
+    public String toString() {
+        return super.toString().toLowerCase();
+    }
+}
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