Implement WeatherComForecaster adpater for the weather.com Forecast client.

Co-Authored-By: os222

src/main/java/ic/doc/WeatherComForecaster.java

@@ -0,0 +1,47 @@
+package ic.doc;
+
+import com.weather.Day;
+import com.weather.Forecast;
+import com.weather.Forecaster;
+import com.weather.Region;
+
+// Adapter for weather.com's Forecaster API.
+public class WeatherComForecaster implements WeatherForecaster {
+  private final Forecaster forecaster;
+
+  WeatherComForecaster(Forecaster forecaster) {
+    this.forecaster = forecaster;
+  }
+
+  @Override
+  public WeatherForecast forecastFor(WeatherRegion region, Weekday day) {
+    Forecast forecast = forecaster.forecastFor(convertWeatherRegion(region), convertWeekday(day));
+    return new WeatherForecast(forecast.summary(), forecast.temperature());
+  }
+
+  public static Region convertWeatherRegion(WeatherRegion region) {
+    return switch (region) {
+      case BIRMINGHAM -> Region.BIRMINGHAM;
+      case EDINBURGH -> Region.EDINBURGH;
+      case GLASGOW -> Region.GLASGOW;
+      case LONDON -> Region.LONDON;
+      case MANCHESTER -> Region.MANCHESTER;
+      case NORTH_ENGLAND -> Region.NORTH_ENGLAND;
+      case SOUTH_WEST_ENGLAND -> Region.SOUTH_WEST_ENGLAND;
+      case SOUTH_EAST_ENGLAND -> Region.SOUTH_EAST_ENGLAND;
+      case WALES -> Region.WALES;
+    };
+  }
+
+  public static Day convertWeekday(Weekday day) {
+    return switch (day) {
+      case MONDAY -> Day.MONDAY;
+      case TUESDAY -> Day.TUESDAY;
+      case WEDNESDAY -> Day.WEDNESDAY;
+      case THURSDAY -> Day.THURSDAY;
+      case FRIDAY -> Day.FRIDAY;
+      case SATURDAY -> Day.SATURDAY;
+      case SUNDAY -> Day.SUNDAY;
+    };
+  }
+}

src/main/java/ic/doc/WeatherForecast.java

@@ -1,7 +1,11 @@
 package ic.doc;
 
-public interface WeatherForecast {
-  String summary();
+public record WeatherForecast(String summary, int temperature) {
+  public String summary() {
+    return summary;
+  }
 
-  int temperature();
+  public int temperature() {
+    return temperature;
+  }
 }

src/test/java/ic/doc/WeatherComForecasterTest.java

@@ -0,0 +1,52 @@
+package ic.doc;
+
+import com.weather.Forecast;
+import com.weather.Forecaster;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import static org.junit.Assert.assertEquals;
+
+// Integration test for WeatherComForecaster adapter
+@RunWith(Parameterized.class)
+public class WeatherComForecasterTest {
+  private final WeatherRegion region;
+  private final Weekday day;
+  private final Forecaster forecaster = new Forecaster();
+  private final WeatherComForecaster weatherComForecaster = new WeatherComForecaster(forecaster);
+
+  public WeatherComForecasterTest(WeatherRegion region, Weekday day) {
+    this.region = region;
+    this.day = day;
+  }
+
+  @Test
+  public void testForecastFor() {
+    Forecast forecastExp = forecaster.forecastFor(
+      WeatherComForecaster.convertWeatherRegion(region),
+      WeatherComForecaster.convertWeekday(day)
+    );
+    WeatherForecast forecastAct = weatherComForecaster.forecastFor(region, day);
+    assertEquals(forecastExp.summary(), forecastAct.summary());
+    assertEquals(forecastExp.temperature(), forecastAct.temperature());
+  }
+
+  @Parameterized.Parameters
+  public static Collection<Object[]> data() {
+    return Arrays.asList(new Object[][] {
+      { WeatherRegion.BIRMINGHAM, Weekday.MONDAY },
+      { WeatherRegion.EDINBURGH, Weekday.TUESDAY },
+      { WeatherRegion.GLASGOW, Weekday.WEDNESDAY },
+      { WeatherRegion.LONDON, Weekday.THURSDAY },
+      { WeatherRegion.MANCHESTER, Weekday.FRIDAY },
+      { WeatherRegion.NORTH_ENGLAND, Weekday.SATURDAY },
+      { WeatherRegion.SOUTH_WEST_ENGLAND, Weekday.SUNDAY },
+      { WeatherRegion.SOUTH_EAST_ENGLAND, Weekday.MONDAY },
+      { WeatherRegion.WALES, Weekday.TUESDAY }
+    });
+  }
+}