diff --git a/apps/tetopology/src/main/java/org/onosproject/tetopology/management/api/DefaultNetworks.java b/apps/tetopology/src/main/java/org/onosproject/tetopology/management/api/DefaultNetworks.java
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+/*
+ * 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.tetopology.management.api;
+
+import java.util.List;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Objects;
+
+/**
+ * Default Networks implementation.
+ * <p>
+ * The Set/Get methods below are defined to accept and pass references because
+ * the object class is treated as a "composite" object class that holds
+ * references to various member objects and their relationships, forming a
+ * data tree. Internal routines of the TE topology manager may use the
+ * following example methods to construct and manipulate any piece of data in
+ * the data tree:
+ * <pre>
+ * newNode.getTe().setAdminStatus(), or
+ * newNode.getSupportingNodeIds().add(nodeId), etc.
+ * </pre>
+ * Same for constructors where, for example, a child list may be constructed
+ * first and passed in by reference to its parent object constructor.
+ */
+public class DefaultNetworks implements Networks, TeTopologyEventSubject {
+    private List<Network> networks;
+
+    /**
+     * Creates an instance of DefaultNetworks.
+     */
+    public DefaultNetworks() {
+    }
+
+    /**
+     * Constructor with all fields.
+     *
+     * @param networks list of networks
+     */
+    public DefaultNetworks(List<Network> networks) {
+        this.networks = networks;
+    }
+
+    @Override
+    public List<Network> networks() {
+        return networks;
+    }
+
+    /**
+     * Sets the networks.
+     *
+     * @param networks the networks to set
+     */
+    public void setNetworks(List<Network> networks) {
+        this.networks = networks;
+    }
+
+    @Override
+    public int hashCode() {
+       return Objects.hashCode(networks);
+    }
+
+    @Override
+    public boolean equals(Object object) {
+        if (this == object) {
+            return true;
+        }
+        if (object instanceof DefaultNetworks) {
+            DefaultNetworks that = (DefaultNetworks) object;
+            return Objects.equal(this.networks, that.networks);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("networks", networks)
+                .toString();
+    }
+
+}