content: /*
   * 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.bigtop.manager.common.utils;
  
  import org.springframework.beans.BeanWrapper;
  import org.springframework.beans.BeanWrapperImpl;
  
  import java.beans.PropertyDescriptor;
  import java.util.HashSet;
  import java.util.Set;
  
  public class InstanceUtils {
  
      public static String[] getNullProperties(Object source) {
          BeanWrapper src = new BeanWrapperImpl(source);
          PropertyDescriptor[] pds = src.getPropertyDescriptors();
  
          Set<String> names = new HashSet<>();
          for (PropertyDescriptor pd : pds) {
              Object srcValue = src.getPropertyValue(pd.getName());
              if (srcValue == null) {
                  names.add(pd.getName());
              }
          }
          return names.toArray(new String[0]);
      }
  
      public static String[] getNonNullProperties(Object source) {
          BeanWrapper src = new BeanWrapperImpl(source);
          PropertyDescriptor[] pds = src.getPropertyDescriptors();
  
          Set<String> names = new HashSet<>();
          for (PropertyDescriptor pd : pds) {
              Object srcValue = src.getPropertyValue(pd.getName());
              if (srcValue != null) {
                  names.add(pd.getName());
              }
          }
          return names.toArray(new String[0]);
      }
  }
  