Cisco Ios PortDiscovery

Change-Id: Ic51466d027f45de8ee91c9904e92b450bf9d0bb7
diff --git a/drivers/cisco/src/main/java/org/onosproject/drivers/cisco/PortGetterCiscoIosImpl.java b/drivers/cisco/src/main/java/org/onosproject/drivers/cisco/PortGetterCiscoIosImpl.java
new file mode 100644
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+++ b/drivers/cisco/src/main/java/org/onosproject/drivers/cisco/PortGetterCiscoIosImpl.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2016-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.onosproject.drivers.cisco;
+
+import com.google.common.collect.ImmutableList;
+import org.onosproject.net.behaviour.PortDiscovery;
+import org.onosproject.net.device.PortDescription;
+import org.onosproject.net.driver.AbstractHandlerBehaviour;
+import org.onosproject.netconf.NetconfController;
+import org.onosproject.netconf.NetconfSession;
+import org.slf4j.Logger;
+
+import java.io.IOException;
+import java.util.List;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Retrieves the ports from Cisco IOS devices via netconf.
+ */
+public class PortGetterCiscoIosImpl extends AbstractHandlerBehaviour
+        implements PortDiscovery {
+
+    private final Logger log = getLogger(getClass());
+    private String interfaces;
+
+    @Override
+    public List<PortDescription> getPorts() {
+        NetconfController controller = checkNotNull(handler().get(NetconfController.class));
+        NetconfSession session = controller.getDevicesMap().get(handler().data().deviceId()).getSession();
+        try {
+            interfaces = session.get(showInterfacesRequestBuilder());
+        } catch (IOException e) {
+            log.error("Failed to retrieve Interfaces");
+            return ImmutableList.of();
+        }
+        return ImmutableList.copyOf(TextBlockParserCisco.parseCiscoIosPorts(interfaces));
+    }
+
+    /**
+     * Builds a request crafted to get the configuration required to create port
+     * descriptions for the device.
+     *
+     * @return The request string.
+     */
+    private String showInterfacesRequestBuilder() {
+        //Message ID is injected later.
+        StringBuilder rpc = new StringBuilder("<rpc xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\">");
+        rpc.append("<get>");
+        rpc.append("<filter>");
+        rpc.append("<config-format-text-block>");
+        rpc.append("<text-filter-spec> | include exp_to_match_run_conf </text-filter-spec>");
+        rpc.append("</config-format-text-block>");
+        rpc.append("<oper-data-format-text-block>");
+        rpc.append("<show>interfaces</show>");
+        rpc.append("</oper-data-format-text-block>");
+        rpc.append("</filter>");
+        rpc.append("</get>");
+        rpc.append("</rpc>]]>]]>");
+        return rpc.toString();
+    }
+
+}
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