adding agent config

Change-Id: Id6ca390d4aaeb7760a31d3327b16b953ed51df37
diff --git a/apps/cordconfig/src/main/java/org/onosproject/cordconfig/access/AccessAgentConfig.java b/apps/cordconfig/src/main/java/org/onosproject/cordconfig/access/AccessAgentConfig.java
new file mode 100644
index 0000000..ba655df
--- /dev/null
+++ b/apps/cordconfig/src/main/java/org/onosproject/cordconfig/access/AccessAgentConfig.java
@@ -0,0 +1,53 @@
+package org.onosproject.cordconfig.access;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.google.common.collect.Maps;
+import org.onlab.packet.MacAddress;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.config.Config;
+
+import java.util.Map;
+import java.util.Optional;
+
+/**
+ * Represents configuration for an OLT agent.
+ */
+public class AccessAgentConfig extends Config<DeviceId> {
+
+    private static final String OLTS = "olts";
+    private static final String AGENT_MAC = "mac";
+
+    // TODO: Remove this, it is only useful as long as XOS doesn't manage this.
+    private static final String VTN_LOCATION = "vtn-location";
+
+    /**
+     * Gets the access agent configuration for this device.
+     *
+     * @return access agent configuration
+     */
+    public AccessAgentData getAgent() {
+        JsonNode olts = node.get(OLTS);
+        if (!olts.isObject()) {
+            throw new IllegalArgumentException(OLTS + " should be an object");
+        }
+        Map<ConnectPoint, MacAddress> oltMacInfo = Maps.newHashMap();
+        olts.fields().forEachRemaining(item -> oltMacInfo.put(
+                new ConnectPoint(subject(), PortNumber.fromString(item.getKey())),
+                MacAddress.valueOf(item.getValue().asText())));
+
+        MacAddress agentMac = MacAddress.valueOf(node.path(AGENT_MAC).asText());
+
+        JsonNode vtn = node.path(VTN_LOCATION);
+        Optional<ConnectPoint> vtnLocation;
+        if (vtn.isMissingNode()) {
+            vtnLocation = Optional.empty();
+        } else {
+            vtnLocation = Optional.of(ConnectPoint.deviceConnectPoint(vtn.asText()));
+        }
+
+        return new AccessAgentData(subject(), oltMacInfo, agentMac, vtnLocation);
+    }
+
+}