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 com.alibaba.flink.utils;
  
  import com.alibaba.fastjson.JSON;
  import com.google.common.base.Joiner;
  
  import java.util.LinkedList;
  
  /**
   * @author Jark (wuchong.wc@alibaba-inc.com)
   */
  public class Utils {
  
      public static Object from_json(String json) {
          if (json == null) {
              return null;
          } else {
              // return JSON.parse(json);
              return JSON.parse(json);
          }
      }
  
      /**
       * seconds to string like '30m 40s' and '1d 20h 30m 40s'
       *
       * @param secs
       * @return
       */
      public static String prettyUptime(int secs) {
          String[][] PRETTYSECDIVIDERS = { new String[] {"ms", "1000"}, new String[] { "s", "60" }, new String[] { "m", "60" }, new String[] { "h", "24" },
                  new String[] { "d", null } };
          int diversize = PRETTYSECDIVIDERS.length;
  
          LinkedList<String> tmp = new LinkedList<>();
          int div = secs;
          for (int i = 0; i < diversize; i++) {
              if (PRETTYSECDIVIDERS[i][1] != null) {
                  Integer d = Integer.parseInt(PRETTYSECDIVIDERS[i][1]);
                  tmp.addFirst(div % d + PRETTYSECDIVIDERS[i][0]);
                  div = div / d;
              } else {
                  tmp.addFirst(div + PRETTYSECDIVIDERS[i][0]);
              }
              if (div <= 0 ) break;
          }
  
          Joiner joiner = Joiner.on(" ");
          return joiner.join(tmp);
      }
  
      public static Integer getInt(Object o, Integer defaultValue) {
          if (null == o) {
              return defaultValue;
          }
  
          if (o instanceof Integer ||
                  o instanceof Short ||
                  o instanceof Byte) {
              return ((Number) o).intValue();
          } else if (o instanceof Long) {
              final long l = (Long) o;
              if (l <= Integer.MAX_VALUE && l >= Integer.MIN_VALUE) {
                  return (int) l;
              }
          } else if (o instanceof String) {
              return Integer.parseInt((String) o);
          }
  
          throw new IllegalArgumentException("Don't know how to convert " + o + " to int");
      }
  
      public static Integer getInt(Object o) {
          Integer result = getInt(o, null);
          if (null == result) {
              throw new IllegalArgumentException("Don't know how to convert null to int");
          }
          return result;
      }
  
      public static Long parseLong(Object o) {
          if (o == null) {
              return null;
          }
  
          if (o instanceof String) {
              return Long.valueOf(String.valueOf(o));
          } else if (o instanceof Integer) {
              Integer value = (Integer) o;
              return Long.valueOf(value);
          } else if (o instanceof Long) {
              return (Long) o;
          } else {
              throw new RuntimeException("Invalid value " + o.getClass().getName() + " " + o);
          }
      }
  
      public static Long parseLong(Object o, long defaultValue) {
  
          if (o == null) {
              return defaultValue;
          }
  
          if (o instanceof String) {
              return Long.valueOf(String.valueOf(o));
          } else if (o instanceof Integer) {
              Integer value = (Integer) o;
              return Long.valueOf((Integer) value);
          } else if (o instanceof Long) {
              return (Long) o;
          } else {
              return defaultValue;
          }
      }
  
  
  }
  