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.asterix.om.base;
  
  import java.io.IOException;
  
  import org.apache.asterix.om.base.temporal.GregorianCalendarSystem;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.asterix.om.types.IAType;
  
  import com.fasterxml.jackson.databind.ObjectMapper;
  import com.fasterxml.jackson.databind.node.ObjectNode;
  
  /**
   * ADateTime type represents the timestamp values.
   * <p/>
   * An ADateTime value contains the following time fields:<br/>
   * - year;<br/>
   * - month;<br/>
   * - day;<br/>
   * - hour; <br/>
   * - minute; <br/>
   * - second; <br/>
   * - millisecond. <br/>
   * By default, an ADateTime value is a UTC time value, i.e., there is no timezone information maintained. However user
   * can use the timezone based AQL function to convert a UTC time to a timezone-embedded time.
   * <p/>
   * And the string representation of an ADateTime value follows the ISO8601 standard, in the following format:<br/>
   * [+|-]YYYY-MM-DDThh:mm:ss.xxxZ
   * <p/>
   * Internally, an ADateTime value is stored as the number of milliseconds elapsed since 1970-01-01T00:00:00.000Z (also
   * called chronon time). Functions to convert between a string representation of an ADateTime and its chronon time are
   * implemented in {@link GregorianCalendarSystem}.
   * <p/>
   */
  public class ADateTime implements IAObject {
  
      /**
       * Represent the time interval as milliseconds since 1970-01-01T00:00:00.000Z.
       */
      protected long chrononTime;
  
      public ADateTime(long chrononTime) {
          this.chrononTime = chrononTime;
      }
  
      @Override
      public IAType getType() {
          return BuiltinType.ADATETIME;
      }
  
      public int compare(Object o) {
          if (!(o instanceof ADateTime)) {
              return -1;
          }
  
          ADateTime d = (ADateTime) o;
          if (this.chrononTime > d.chrononTime) {
              return 1;
          } else if (this.chrononTime < d.chrononTime) {
              return -1;
          } else {
              return 0;
          }
      }
  
      public boolean equals(Object o) {
          if (!(o instanceof ADateTime)) {
              return false;
          } else {
              ADateTime t = (ADateTime) o;
              return t.chrononTime == this.chrononTime;
          }
      }
  
      @Override
      public int hashCode() {
          return (int) (chrononTime ^ (chrononTime >>> 32));
      }
  
      @Override
      public boolean deepEqual(IAObject obj) {
          return equals(obj);
      }
  
      @Override
      public int hash() {
          return hashCode();
      }
  
      @Override
      public String toString() {
          return appendDatetime(new StringBuilder().append("datetime: { "), chrononTime).append(" }").toString();
      }
  
      public String toSimpleString() {
          return appendDatetime(new StringBuilder(), chrononTime).toString();
      }
  
      private static StringBuilder appendDatetime(StringBuilder sbder, long chrononTime) {
          try {
              GregorianCalendarSystem.getInstance().getExtendStringRepUntilField(chrononTime, sbder,
                      GregorianCalendarSystem.Fields.YEAR, GregorianCalendarSystem.Fields.MILLISECOND);
              return sbder;
          } catch (IOException e) {
              throw new IllegalStateException(e);
          }
      }
  
      public long getChrononTime() {
          return chrononTime;
      }
  
      @Override
      public ObjectNode toJSON() {
          ObjectMapper om = new ObjectMapper();
          ObjectNode json = om.createObjectNode();
  
          json.put("ADateTime", chrononTime);
  
          return json;
      }
  }
  