/*
 * 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.phoenix.expression.function;

import org.apache.phoenix.thirdparty.com.google.common.base.Joiner;

public enum TimeUnit {
  DAY("day"),
  HOUR("hour"),
  MINUTE("minute"),
  SECOND("second"),
  MILLISECOND("millisecond"),
  WEEK("week"),
  MONTH("month"),
  YEAR("year");

  private String value;

  private TimeUnit(String value) {
    this.value = value;
  }

  public static final String VALID_VALUES = Joiner.on(", ").join(TimeUnit.values());

  public static TimeUnit getTimeUnit(String timeUnit) {
    if (timeUnit == null) {
      throw new IllegalArgumentException(
        "No time unit value specified. Only a time unit value that belongs to one of these : "
          + VALID_VALUES + " is allowed.");
    }
    for (TimeUnit tu : values()) {
      if (timeUnit.equalsIgnoreCase(tu.value)) {
        return tu;
      }
    }
    throw new IllegalArgumentException("Invalid value of time unit " + timeUnit
      + ". Only a time unit value that belongs to one of these : " + VALID_VALUES + " is allowed.");
  }
}
