added FlowObjectiveService to act as an objective manager between applications and drivers

Change-Id: I4dc44db8bafae8a55b7663895c87b1b08645637f
diff --git a/drivers/src/main/java/org/onosproject/driver/pipeline/DefaultDrivers.java b/drivers/src/main/java/org/onosproject/driver/pipeline/DefaultDrivers.java
new file mode 100644
index 0000000..e42e346
--- /dev/null
+++ b/drivers/src/main/java/org/onosproject/driver/pipeline/DefaultDrivers.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2015 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.onosproject.driver.pipeline;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onosproject.net.driver.DriverAdminService;
+import org.onosproject.net.driver.DriverProvider;
+import org.onosproject.net.driver.XmlDriverLoader;
+import org.apache.felix.scr.annotations.Component;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+
+/**
+ * Bootstrap for built in drivers.
+ */
+@Component(immediate = true)
+public class DefaultDrivers {
+
+    private final Logger log = LoggerFactory.getLogger(getClass());
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DriverAdminService driverService;
+
+    private DriverProvider provider;
+
+    @Activate
+    protected void activate() {
+        XmlDriverLoader xmlDriverLoader =
+                new XmlDriverLoader(getClass().getClassLoader());
+        try {
+            provider = xmlDriverLoader.loadDrivers(
+                    getClass().getResourceAsStream("/default.xml"));
+            driverService.registerProvider(
+                    provider);
+        } catch (IOException e) {
+            log.warn("Unable to load drivers");
+        }
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    protected void deactivate() {
+        driverService.unregisterProvider(provider);
+        log.info("Stopped");
+    }
+
+
+}