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.carbondata.core.keygenerator.directdictionary.timestamp;
  
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.TimeZone;
  
  import org.apache.carbondata.common.logging.LogServiceFactory;
  import org.apache.carbondata.core.constants.CarbonCommonConstants;
  import org.apache.carbondata.core.metadata.datatype.DataType;
  import org.apache.carbondata.core.metadata.datatype.DataTypes;
  
  import org.apache.log4j.Logger;
  
  /**
   * The class provides the method to generate dictionary key and getting the actual value from
   * the dictionaryKey for direct dictionary column for TIMESTAMP type.
   */
  public class DateDirectDictionaryGenerator extends AbstractDirectDictionaryGenerator {
  
    public static final int cutOffDate = Integer.MAX_VALUE >> 1;
    private static final long SECONDS_PER_DAY = 60 * 60 * 24L;
    public static final long MILLIS_PER_DAY = SECONDS_PER_DAY * 1000L;
    /**
     * min value supported for date type column
     */
    public static final long MIN_VALUE;
    /**
     * MAx value supported for date type column
     */
    public static final long MAX_VALUE;
    /**
     * Logger instance
     */
    private static final Logger LOGGER =
        LogServiceFactory.getLogService(DateDirectDictionaryGenerator.class.getName());
  
    static {
      SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
      df.setTimeZone(TimeZone.getTimeZone("GMT"));
      long minValue = 0;
      long maxValue = 0;
      try {
        minValue = df.parse("0001-01-01").getTime();
        maxValue = df.parse("9999-12-31").getTime();
      } catch (ParseException e) {
        // the Exception will not occur as constant value is being parsed
      }
      MIN_VALUE = minValue;
      MAX_VALUE = maxValue;
    }
  
    public DateDirectDictionaryGenerator(String dateFormat) {
      super(dateFormat);
    }
  
    /**
     * The method take dictionary key as input and returns the
     *
     * @param key
     * @return member value/actual value Date
     */
    @Override
    public Object getValueFromSurrogate(int key) {
      if (key == CarbonCommonConstants.DIRECT_DICT_VALUE_NULL) {
        return null;
      }
      return key - cutOffDate;
    }
  
    @Override
    public int generateKey(long timeValue) {
      if (timeValue < MIN_VALUE || timeValue > MAX_VALUE) {
        if (LOGGER.isDebugEnabled()) {
          LOGGER.debug("Value for date type column is not in valid range. Value considered as null.");
        }
        return CarbonCommonConstants.DIRECT_DICT_VALUE_NULL;
      }
      return (int) Math.floor((double) timeValue / MILLIS_PER_DAY) + cutOffDate;
    }
  
    @Override
    public void initialize() {
      if (simpleDateFormatLocal.get() == null) {
        simpleDateFormatLocal.set(new SimpleDateFormat(dateFormat));
        simpleDateFormatLocal.get().setLenient(false);
        simpleDateFormatLocal.get().setTimeZone(TimeZone.getTimeZone("GMT"));
      }
    }
  
    @Override
    public DataType getReturnType() {
      return DataTypes.INT;
    }
  }