First implementation of BNG application

The application offers network level APIs for the BNG data plane.

An attachment (BngAttachment) at network level is identified by an arbitrary string.
The exposed APIs are key-value like APIs.

Change-Id: If0e484f487ea16dd8c7dd99642f75686e1dbc29a
diff --git a/app/src/main/java/org/opencord/bng/config/PppoeRelayConfig.java b/app/src/main/java/org/opencord/bng/config/PppoeRelayConfig.java
new file mode 100644
index 0000000..c094f7f
--- /dev/null
+++ b/app/src/main/java/org/opencord/bng/config/PppoeRelayConfig.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2019-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.bng.config;
+
+import org.onlab.packet.MacAddress;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.config.Config;
+
+/**
+ * Configuration for the PPPoE control packet relay service.
+ */
+public class PppoeRelayConfig extends Config<ApplicationId> {
+    public static final String KEY = "pppoerelay";
+
+    private static final String PPPOE_SERVER_CONNECT_POINT = "pppoeServerConnectPoint";
+    private static final String OLT_CONNECT_POINT = "oltConnectPoint";
+    private static final String PPPOE_MAC_ADDRESS = "pppoeMacAddress";
+
+    @Override
+    public boolean isValid() {
+        return hasOnlyFields(PPPOE_SERVER_CONNECT_POINT, OLT_CONNECT_POINT, PPPOE_MAC_ADDRESS) &&
+                hasFields(PPPOE_SERVER_CONNECT_POINT, OLT_CONNECT_POINT, PPPOE_MAC_ADDRESS);
+    }
+
+    /**
+     * Gets the PPPoE server connect point.
+     *
+     * @return PPPoE server connect point
+     */
+    public ConnectPoint getPppoeServerConnectPoint() {
+        return ConnectPoint.deviceConnectPoint(object.path(PPPOE_SERVER_CONNECT_POINT).asText());
+    }
+
+    /**
+     * Gets the connect point where the OLT is connected to the ASG.
+     *
+     * @return ASG to OLT connect point
+     */
+    public ConnectPoint getAsgToOltConnectPoint() {
+        return ConnectPoint.deviceConnectPoint(object.path(OLT_CONNECT_POINT).asText());
+    }
+
+    /**
+     * Gets the PPPoE server MAC address.
+     *
+     * @return PPPoE server MAC address
+     */
+    public MacAddress getPppoeMacAddress() {
+        return MacAddress.valueOf(object.path(PPPOE_MAC_ADDRESS).asText());
+    }
+}
+