Added utility class for notebook re po payload deserialization

zeppelin-server/src/main/java/org/apache/zeppelin/rest/message/NotebookRepoSettingsRequest.java

@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.zeppelin.rest.message;
+
+import org.apache.commons.lang.StringUtils;
+
+import java.util.Collections;
+import java.util.Map;
+
+/**
+ * Represent payload of a notebook repo settings.
+ */
+public class NotebookRepoSettingsRequest {
+
+    public static final NotebookRepoSettingsRequest EMPTY = new NotebookRepoSettingsRequest();
+
+    public String name;
+    public Map<String, String> settings;
+
+    public NotebookRepoSettingsRequest() {
+        name = StringUtils.EMPTY;
+        settings = Collections.emptyMap();
+    }
+
+    public boolean isEmpty() {
+        return this == EMPTY;
+    }
+
+    public static boolean isEmpty(NotebookRepoSettingsRequest repoSetting) {
+        if (repoSetting == null) {
+            return true;
+        }
+        return repoSetting.isEmpty();
+    }
+}