Initial base code for DHCP L2 Relay, integrated with Sadis

Change-Id: I2a7de8e2cfbff2c7e873ba1c0e473aac46466b90
diff --git a/src/main/java/org/opencord/dhcpl2relay/DhcpL2RelayConfig.java b/src/main/java/org/opencord/dhcpl2relay/DhcpL2RelayConfig.java
new file mode 100755
index 0000000..4816285
--- /dev/null
+++ b/src/main/java/org/opencord/dhcpl2relay/DhcpL2RelayConfig.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2017-present Open Networking Laboratory
+ *
+ * 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.dhcpl2relay;
+
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.config.Config;
+
+import static org.onosproject.net.config.Config.FieldPresence.MANDATORY;
+
+/**
+ * DHCP Relay Config class.
+ */
+public class DhcpL2RelayConfig extends Config<ApplicationId> {
+
+    private static final String DHCP_CONNECT_POINT = "dhcpserverConnectPoint";
+
+    @Override
+    public boolean isValid() {
+
+        return hasOnlyFields(DHCP_CONNECT_POINT) &&
+                isConnectPoint(DHCP_CONNECT_POINT, MANDATORY);
+    }
+
+    /**
+     * Returns the dhcp server connect point.
+     *
+     * @return dhcp server connect point
+     */
+    public ConnectPoint getDhcpServerConnectPoint() {
+        return ConnectPoint.deviceConnectPoint(object.path(DHCP_CONNECT_POINT).asText());
+    }
+}