BIGTOP-1991. Add BigTop Weatherman

1 files changed, 80 insertions, 0 deletions

diff --git a/bigtop-data-generators/bigtop-weatherman/src/main/java/org/apache/bigtop/datagenerators/weatherman/internal/WeatherSamplerBuilder.java b/bigtop-data-generators/bigtop-weatherman/src/main/java/org/apache/bigtop/datagenerators/weatherman/internal/WeatherSamplerBuilder.java
new file mode 100644
index 00000000..40128ae9
--- /dev/null
+++ b/bigtop-data-generators/bigtop-weatherman/src/main/java/org/apache/bigtop/datagenerators/weatherman/internal/WeatherSamplerBuilder.java
@@ -0,0 +1,80 @@
+/**
+ * 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.internal;
+
+import java.util.Collection;
+
+import org.apache.bigtop.datagenerators.locations.Location;
+import org.apache.bigtop.datagenerators.samplers.SeedFactory;
+import org.apache.bigtop.datagenerators.samplers.samplers.ConditionalSampler;
+import org.apache.bigtop.datagenerators.samplers.samplers.Sampler;
+import org.apache.bigtop.datagenerators.weatherman.WeatherRecord;
+import org.joda.time.LocalDate;
+
+public class WeatherSamplerBuilder {
+
+  private final WeatherStationParameters parameters;
+  private final SeedFactory seedFactory;
+  private final LocalDate startDate;
+
+  public WeatherSamplerBuilder(
+          Collection<WeatherStationParameters> weatherParameters,
+          Location location, LocalDate startDate, SeedFactory seedFactory) {
+    parameters = findClosest(weatherParameters, location);
+    this.seedFactory = seedFactory;
+    this.startDate = startDate;
+  }
+
+  private WeatherStationParameters findClosest(
+          Collection<WeatherStationParameters> weatherParameters,
+          Location location) {
+    WeatherStationParameters closestStation = null;
+    double minDist = Double.MAX_VALUE;
+
+    for (WeatherStationParameters parameters : weatherParameters) {
+      double dist = location.distance(parameters.getCoordinates());
+      if (dist < minDist) {
+        minDist = dist;
+        closestStation = parameters;
+      }
+    }
+
+    return closestStation;
+  }
+
+  private ConditionalSampler<WeatherRecordBuilder, WeatherRecordBuilder> buildTempSampler() {
+    return new TemperatureSampler(startDate, parameters.getTemperatureAverage(),
+            parameters.getTemperatureRealCoeff(),
+            parameters.getTemperatureImagCoeff(),
+            parameters.getTemperatureDerivStd(), seedFactory);
+  }
+
+  private ConditionalSampler<WeatherRecordBuilder, WeatherRecordBuilder> buildWindSpeedSampler() {
+    return new WindSpeedSampler(parameters.getWindSpeedRealCoeff(),
+            parameters.getWindSpeedImagCoeff(), parameters.getWindSpeedK(),
+            parameters.getWindSpeedTheta(), seedFactory);
+  }
+
+  private ConditionalSampler<WeatherRecordBuilder, WeatherRecordBuilder> buildPrecipitationSampler() {
+    return new PrecipitationSampler(parameters.getPrecipitationAverage(),
+            seedFactory);
+  }
+
+  public Sampler<WeatherRecord> build() {
+    return new WeatherSampler(startDate, buildTempSampler(),
+            buildWindSpeedSampler(), buildPrecipitationSampler());
+  }
+}