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.temporal;
  
  import java.io.DataOutput;
  import java.io.IOException;
  
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.dataflow.common.data.parsers.IValueParser;
  import org.apache.hyracks.dataflow.common.data.parsers.IValueParserFactory;
  
  public class ADateTimeParserFactory implements IValueParserFactory {
  
      public static final IValueParserFactory INSTANCE = new ADateTimeParserFactory();
  
      private static final long serialVersionUID = 1L;
  
      private static final String dateTimeErrorMessage = "Wrong Input Format for a DateTime Value";
  
      private ADateTimeParserFactory() {
  
      }
  
      @Override
      public IValueParser createValueParser() {
  
          return new IValueParser() {
  
              @Override
              public boolean parse(char[] buffer, int start, int length, DataOutput out) throws HyracksDataException {
                  long parsedDateTime = parseDateTimePart(buffer, start, length);
                  try {
                      out.writeLong(parsedDateTime);
                      return true;
                  } catch (IOException ex) {
                      throw HyracksDataException.create(ex);
                  }
              }
          };
      }
  
      /**
       * Parse the given char sequence as a datetime string, and return the milliseconds represented by the date and time.
       *
       * @param dateTimeString
       * @param start
       * @param length
       * @return
       * @throws Exception
       */
      public static long parseDateTimePart(String dateTimeString, int start, int length) throws HyracksDataException {
          long chrononTimeInMs = 0;
  
          short timeOffset = (short) ((dateTimeString.charAt(start) == '-') ? 1 : 0);
  
          timeOffset += 8;
  
          if (dateTimeString.charAt(start + timeOffset) != 'T') {
              timeOffset += 2;
              if (dateTimeString.charAt(start + timeOffset) != 'T') {
                  throw new HyracksDataException(dateTimeErrorMessage + ": missing T");
              }
          }
  
          chrononTimeInMs = ADateParserFactory.parseDatePart(dateTimeString, start, timeOffset);
  
          return chrononTimeInMs
                  + ATimeParserFactory.parseTimePart(dateTimeString, start + timeOffset + 1, length - timeOffset - 1);
      }
  
      /**
       * A copy-and-paste of {@link #parseDateTimePart(String, int, int)} but for a char array, in order
       * to avoid object creation.
       *
       * @param dateTimeString
       * @param start
       * @param length
       * @return
       * @throws HyracksDataException
       */
      public static long parseDateTimePart(char[] dateTimeString, int start, int length) throws HyracksDataException {
          long chrononTimeInMs = 0;
  
          short timeOffset = (short) ((dateTimeString[start] == '-') ? 1 : 0);
  
          timeOffset += 8;
  
          if (dateTimeString[start + timeOffset] != 'T') {
              timeOffset += 2;
              if (dateTimeString[start + timeOffset] != 'T') {
                  throw new HyracksDataException(dateTimeErrorMessage + ": missing T");
              }
          }
  
          chrononTimeInMs = ADateParserFactory.parseDatePart(dateTimeString, start, timeOffset);
  
          return chrononTimeInMs
                  + ATimeParserFactory.parseTimePart(dateTimeString, start + timeOffset + 1, length - timeOffset - 1);
      }
  }
  