diff --git a/core/common/src/main/java/org/onosproject/utils/Comparators.java b/core/common/src/main/java/org/onosproject/utils/Comparators.java
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+++ b/core/common/src/main/java/org/onosproject/utils/Comparators.java
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+/*
+ * Copyright 2014-2016 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.utils;
+
+import org.onosproject.cluster.ControllerNode;
+import org.onosproject.core.Application;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.incubator.net.intf.Interface;
+import org.onosproject.net.key.DeviceKey;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.Element;
+import org.onosproject.net.ElementId;
+import org.onosproject.net.Port;
+import org.onosproject.net.flow.FlowRule;
+import org.onosproject.net.group.Group;
+import org.onosproject.net.region.Region;
+import org.onosproject.net.statistic.TypedFlowEntryWithLoad;
+import org.onosproject.net.topology.TopologyCluster;
+
+import java.util.Comparator;
+
+/**
+ * Various comparators.
+ */
+public final class Comparators {
+
+    // Ban construction
+    private Comparators() {
+    }
+
+    public static final Comparator<ApplicationId> APP_ID_COMPARATOR = new Comparator<ApplicationId>() {
+        @Override
+        public int compare(ApplicationId id1, ApplicationId id2) {
+            return id1.id() - id2.id();
+        }
+    };
+
+    public static final Comparator<Application> APP_COMPARATOR = new Comparator<Application>() {
+        @Override
+        public int compare(Application app1, Application app2) {
+            return app1.id().id() - app2.id().id();
+        }
+    };
+
+    public static final Comparator<ElementId> ELEMENT_ID_COMPARATOR = new Comparator<ElementId>() {
+        @Override
+        public int compare(ElementId id1, ElementId id2) {
+            return id1.toString().compareTo(id2.toString());
+        }
+    };
+
+    public static final Comparator<Element> ELEMENT_COMPARATOR = new Comparator<Element>() {
+        @Override
+        public int compare(Element e1, Element e2) {
+            return e1.id().toString().compareTo(e2.id().toString());
+        }
+    };
+
+    public static final Comparator<FlowRule> FLOW_RULE_COMPARATOR = new Comparator<FlowRule>() {
+        @Override
+        public int compare(FlowRule f1, FlowRule f2) {
+            // Compare table IDs in ascending order
+            int tableCompare = f1.tableId() - f2.tableId();
+            if (tableCompare != 0) {
+                return tableCompare;
+            }
+            // Compare priorities in descending order
+            int priorityCompare = f2.priority() - f1.priority();
+            return (priorityCompare == 0)
+                    ? Long.valueOf(f1.id().value()).compareTo(f2.id().value())
+                    : priorityCompare;
+        }
+    };
+
+    public static final Comparator<Group> GROUP_COMPARATOR = new Comparator<Group>() {
+        @Override
+        public int compare(Group g1, Group g2) {
+            return Long.valueOf(g1.id().id()).compareTo(Long.valueOf(g2.id().id()));
+        }
+    };
+
+    public static final Comparator<Port> PORT_COMPARATOR = new Comparator<Port>() {
+        @Override
+        public int compare(Port p1, Port p2) {
+            long delta = p1.number().toLong() - p2.number().toLong();
+            return delta == 0 ? 0 : (delta < 0 ? -1 : +1);
+        }
+    };
+
+    public static final Comparator<TopologyCluster> CLUSTER_COMPARATOR = new Comparator<TopologyCluster>() {
+        @Override
+        public int compare(TopologyCluster c1, TopologyCluster c2) {
+            return c1.id().index() - c2.id().index();
+        }
+    };
+
+    public static final Comparator<ControllerNode> NODE_COMPARATOR = new Comparator<ControllerNode>() {
+        @Override
+        public int compare(ControllerNode ci1, ControllerNode ci2) {
+            return ci1.id().toString().compareTo(ci2.id().toString());
+        }
+    };
+
+    public static final Comparator<ConnectPoint> CONNECT_POINT_COMPARATOR = new Comparator<ConnectPoint>() {
+        @Override
+        public int compare(ConnectPoint o1, ConnectPoint o2) {
+            int compareId = ELEMENT_ID_COMPARATOR.compare(o1.elementId(), o2.elementId());
+            return (compareId != 0) ?
+                    compareId :
+                    Long.signum(o1.port().toLong() - o2.port().toLong());
+        }
+    };
+
+    public static final Comparator<Interface> INTERFACES_COMPARATOR = (intf1, intf2) ->
+            CONNECT_POINT_COMPARATOR.compare(intf1.connectPoint(), intf2.connectPoint());
+
+    public static final Comparator<TypedFlowEntryWithLoad> TYPEFLOWENTRY_WITHLOAD_COMPARATOR =
+            new Comparator<TypedFlowEntryWithLoad>() {
+                @Override
+                public int compare(TypedFlowEntryWithLoad fe1, TypedFlowEntryWithLoad fe2) {
+                    long delta = fe1.load().rate() - fe2.load().rate();
+                    return delta == 0 ? 0 : (delta > 0 ? -1 : +1);
+                }
+            };
+
+    public static final Comparator<DeviceKey> DEVICE_KEY_COMPARATOR = new Comparator<DeviceKey>() {
+        @Override
+        public int compare(DeviceKey deviceKey1, DeviceKey deviceKey2) {
+            return deviceKey1.deviceKeyId().id().toString().compareTo(deviceKey2.deviceKeyId().id().toString());
+        }
+    };
+
+    public static final Comparator<Region> REGION_COMPARATOR = new Comparator<Region>() {
+        @Override
+        public int compare(Region region1, Region region2) {
+            return region1.id().toString().compareTo(region2.id().toString());
+        }
+    };
+}