[ONOS-3856] Implement BGP flow spec RIB out.

Change-Id: I2fa378851ea1b953def3d8feeedbc50cfe4d50ca

+/*
+ * Copyright 2016 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.bgp.controller.impl;
+
+import java.util.Map;
+import java.util.TreeMap;
+
+import org.onosproject.bgpio.types.RouteDistinguisher;
+import org.onosproject.bgpio.protocol.flowspec.BgpFlowSpecDetails;
+import org.onosproject.bgpio.protocol.flowspec.BgpFlowSpecPrefix;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Implementation of BGP flow spec RIB out for each peer.
+ */
+public class BgpFlowSpecRibOut {
+    private Map<BgpFlowSpecPrefix, BgpFlowSpecDetails> flowSpecTree = new TreeMap<>();
+    private Map<RouteDistinguisher, Map<BgpFlowSpecPrefix, BgpFlowSpecDetails>> vpnFlowSpecTree = new TreeMap<>();
+
+    /**
+     * Returns the BGP flow spec info.
+     *
+     * @return BGP flow spec tree
+     */
+    public Map<BgpFlowSpecPrefix, BgpFlowSpecDetails> flowSpecTree() {
+        return flowSpecTree;
+    }
+
+    /**
+     * Gets VPN flowspec tree.
+     *
+     * @return vpn flow spec tree
+     */
+    public Map<RouteDistinguisher, Map<BgpFlowSpecPrefix, BgpFlowSpecDetails>> vpnFlowSpecTree() {
+        return vpnFlowSpecTree;
+    }
+
+
+    /**
+     * Update BGP flow spec details.
+     *
+     * @param prefix prefix Info
+     * @param flowSpec BGP flow specifications details
+     */
+    public void add(BgpFlowSpecPrefix prefix, BgpFlowSpecDetails flowSpec) {
+        if (flowSpecTree.containsKey(prefix)) {
+            flowSpecTree.replace(prefix, flowSpec);
+        } else {
+            flowSpecTree.put(prefix, flowSpec);
+        }
+    }
+
+    /**
+     * Removes flow spec.
+     *
+     * @param flowSpec BGP flow specification
+     */
+    public void delete(BgpFlowSpecPrefix flowSpec) {
+        if (flowSpecTree.containsKey(flowSpec)) {
+            flowSpecTree.remove(flowSpec);
+        }
+    }
+
+    /**
+     * Update BGP flow spec details with routedistinguisher.
+     *
+     * @param routeDistinguisher route distinguisher
+     * @param prefix prefix Info
+     * @param flowSpec BGP flow specifications details
+     */
+    public void add(RouteDistinguisher routeDistinguisher, BgpFlowSpecPrefix prefix, BgpFlowSpecDetails flowSpec) {
+        Map<BgpFlowSpecPrefix, BgpFlowSpecDetails> fsTree;
+        if (!vpnFlowSpecTree.containsKey(routeDistinguisher)) {
+
+            fsTree = new TreeMap<>();
+
+            vpnFlowSpecTree.put(routeDistinguisher, fsTree);
+        } else {
+            fsTree = vpnFlowSpecTree().get(routeDistinguisher);
+        }
+        if (fsTree.containsKey(prefix)) {
+            fsTree.replace(prefix, flowSpec);
+        } else {
+            fsTree.put(prefix, flowSpec);
+        }
+    }
+
+    /**
+     * Removes flow spec.
+     *
+     * @param routeDistinguisher route distinguisher
+     * @param flowSpec BGP flow specification
+     */
+    public void delete(RouteDistinguisher routeDistinguisher, BgpFlowSpecPrefix flowSpecPrefix) {
+        if (vpnFlowSpecTree.containsKey(routeDistinguisher)) {
+            Map<BgpFlowSpecPrefix, BgpFlowSpecDetails> fsTree = vpnFlowSpecTree().get(routeDistinguisher);
+            fsTree.remove(flowSpecPrefix);
+            if (fsTree.size() == 0) {
+                vpnFlowSpecTree.remove(routeDistinguisher);
+            }
+        }
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("flowSpecTree", flowSpecTree)
+                .add("vpnFlowSpecTree", vpnFlowSpecTree)
+                .toString();
+    }
+}