[ONOS-7905] Add default implementation for kubernetes data model

Change-Id: I08e9266dec2050e8299e4189745608a6e03fd06e
diff --git a/apps/k8s-networking/app/src/test/java/org/onosproject/k8snetworking/codec/K8sNetworkJsonMatcher.java b/apps/k8s-networking/app/src/test/java/org/onosproject/k8snetworking/codec/K8sNetworkJsonMatcher.java
new file mode 100644
index 0000000..435de0f
--- /dev/null
+++ b/apps/k8s-networking/app/src/test/java/org/onosproject/k8snetworking/codec/K8sNetworkJsonMatcher.java
@@ -0,0 +1,109 @@
+/*
+ * Copyright 2019-present Open Networking Foundation
+ *
+ * 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.k8snetworking.codec;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeDiagnosingMatcher;
+import org.onosproject.k8snetworking.api.K8sNetwork;
+
+/**
+ * Hamcrest matcher for kubernetes network.
+ */
+public final class K8sNetworkJsonMatcher extends TypeSafeDiagnosingMatcher<JsonNode> {
+
+    private final K8sNetwork network;
+
+    private static final String NETWORK_ID = "networkId";
+    private static final String TYPE = "type";
+    private static final String MTU = "mtu";
+    private static final String SEGMENT_ID = "segmentId";
+    private static final String GATEWAY_IP = "gatewayIp";
+    private static final String CIDR = "cidr";
+
+    private K8sNetworkJsonMatcher(K8sNetwork network) {
+        this.network = network;
+    }
+
+    @Override
+    protected boolean matchesSafely(JsonNode jsonNode, Description description) {
+
+        // check network ID
+        String jsonNetworkId = jsonNode.get(NETWORK_ID).asText();
+        String networkId = network.networkId();
+        if (!jsonNetworkId.equals(networkId)) {
+            description.appendText("network ID was " + jsonNetworkId);
+            return false;
+        }
+
+        // check type
+        String jsonType = jsonNode.get(TYPE).asText();
+        String type = network.type().name();
+        if (!jsonType.equals(type)) {
+            description.appendText("network type was " + jsonType);
+            return false;
+        }
+
+        // check MTU
+        int jsonMtu = jsonNode.get(MTU).asInt();
+        int mtu = network.mtu();
+        if (jsonMtu != mtu) {
+            description.appendText("MTU was " + jsonMtu);
+            return false;
+        }
+
+        // check segment ID
+        String jsonSegmentId = jsonNode.get(SEGMENT_ID).asText();
+        String segmentId = network.segmentId();
+        if (!jsonSegmentId.equals(segmentId)) {
+            description.appendText("segment ID was " + jsonSegmentId);
+            return false;
+        }
+
+        // check gateway IP
+        String jsonGatewayIp = jsonNode.get(GATEWAY_IP).asText();
+        String gatewayIp = network.gatewayIp().toString();
+        if (!jsonGatewayIp.equals(gatewayIp)) {
+            description.appendText("gateway IP was " + jsonGatewayIp);
+            return false;
+        }
+
+        // check CIDR
+        String jsonCidr = jsonNode.get(CIDR).asText();
+        String cidr = network.cidr();
+        if (!jsonCidr.equals(cidr)) {
+            description.appendText("CIDR was " + jsonCidr);
+            return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public void describeTo(Description description) {
+        description.appendText(network.toString());
+    }
+
+    /**
+     * Factory to allocate a kubernetes network matcher.
+     *
+     * @param network kubernetes network object we are looking for
+     * @return matcher
+     */
+    public static K8sNetworkJsonMatcher matchesK8sNetwork(K8sNetwork network) {
+        return new K8sNetworkJsonMatcher(network);
+    }
+}