Initial support for multi kubernetes clusters for k8s nodes

Change-Id: I6ca132898f8e157e0583de38a637fdc135f21d6f
diff --git a/apps/k8s-node/app/src/test/java/org/onosproject/k8snode/codec/HostNodesInfoJsonMatcher.java b/apps/k8s-node/app/src/test/java/org/onosproject/k8snode/codec/HostNodesInfoJsonMatcher.java
new file mode 100644
index 0000000..5de7a71
--- /dev/null
+++ b/apps/k8s-node/app/src/test/java/org/onosproject/k8snode/codec/HostNodesInfoJsonMatcher.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2020-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.k8snode.codec;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeDiagnosingMatcher;
+import org.onosproject.k8snode.api.HostNodesInfo;
+
+/**
+ * Hamcrest matcher for HostNodesInfo.
+ */
+public final class HostNodesInfoJsonMatcher extends TypeSafeDiagnosingMatcher<JsonNode> {
+
+    private final HostNodesInfo hostNodesInfo;
+
+    private static final String HOST_IP = "hostIp";
+    private static final String NODES = "nodes";
+
+    private HostNodesInfoJsonMatcher(HostNodesInfo hostNodesInfo) {
+        this.hostNodesInfo = hostNodesInfo;
+    }
+
+    @Override
+    protected boolean matchesSafely(JsonNode jsonNode, Description description) {
+
+        // check host IP
+        String jsonHostIp = jsonNode.get(HOST_IP).asText();
+        String hostIp = hostNodesInfo.hostIp().toString();
+        if (!jsonHostIp.equals(hostIp)) {
+            description.appendText("host IP was " + jsonHostIp);
+            return false;
+        }
+
+        // check nodes
+        JsonNode jsonNodes = jsonNode.get(NODES);
+        if (jsonNodes.size() != hostNodesInfo.nodes().size()) {
+            description.appendText("Nodes size was " + jsonNodes.size());
+            return false;
+        }
+
+        boolean nodeFound = true;
+        ArrayNode jsonNodeArray = (ArrayNode) jsonNodes;
+        for (JsonNode jsonNodeTmp : jsonNodeArray) {
+            if (!hostNodesInfo.nodes().contains(jsonNodeTmp.asText())) {
+                nodeFound = false;
+            }
+        }
+
+        if (!nodeFound) {
+            description.appendText("Node not found");
+            return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public void describeTo(Description description) {
+        description.appendText(hostNodesInfo.toString());
+    }
+
+    /**
+     * Factory to allocate a hostNodesInfo matcher.
+     *
+     * @param info host IP address to nodes mapping info
+     * @return matcher
+     */
+    public static HostNodesInfoJsonMatcher matchesHostNodesInfo(HostNodesInfo info) {
+        return new HostNodesInfoJsonMatcher(info);
+    }
+}