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.bigtop.datagenerators.weatherman;
  
  import java.util.List;
  
  import org.apache.bigtop.datagenerators.locations.Location;
  import org.apache.bigtop.datagenerators.samplers.SeedFactory;
  import org.apache.bigtop.datagenerators.samplers.samplers.Sampler;
  import org.apache.bigtop.datagenerators.weatherman.internal.WeatherParametersReader;
  import org.apache.bigtop.datagenerators.weatherman.internal.WeatherSamplerBuilder;
  import org.apache.bigtop.datagenerators.weatherman.internal.WeatherStationParameters;
  import org.joda.time.LocalDate;
  
  /**
   * Generates daily weather records for a given location.
   *
   * @author rnowling
   *
   */
  public class WeatherGenerator implements Sampler<WeatherRecord> {
    private final Sampler<WeatherRecord> weatherSampler;
  
    /**
     * Initializes the generator.
     *
     * @param startDate
     *          - first day of simulation
     * @param location
     *          - location to simulate weather for
     * @param seedFactory
     *          - for initializing seeds
     * @throws Exception
     *           - if weather parameter data cannot be read
     */
    public WeatherGenerator(LocalDate startDate, Location location,
            SeedFactory seedFactory) throws Exception {
      List<WeatherStationParameters> parameters = new WeatherParametersReader()
              .readParameters();
      WeatherSamplerBuilder builder = new WeatherSamplerBuilder(parameters,
              location, startDate, seedFactory);
      weatherSampler = builder.build();
    }
  
    /**
     * Generates a daily WeatherRecord for consecutive days, one day per call.
     *
     * @return Weather data for a single day
     * @throws Exception
     */
    public WeatherRecord sample() throws Exception {
      return weatherSampler.sample();
    }
  }
  