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WeatherAPI.cs
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WeatherAPI.cs
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// Copyright 2012 John Luetke
//
// Licensed 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.
using System;
using System.Collections.Generic;
using System.Reflection;
using WeatherAPI.Providers;
namespace WeatherAPI {
/// <summary>
/// Gateway class to the WeatherAPI.
/// </summary>
/// <exception cref='ArgumentException'>
/// Thrown when an argument passed to a method is invalid.
/// </exception>
public class WeatherAPI {
/// <summary>
/// Gets the weather for the given city and state
/// </summary>
/// <remarks>
/// This is the most general level for which weather can be retrieved.
/// </remarks>
/// <param name='city'>
/// City name for which weather information should be retrieved
/// </param>
/// <param name='state'>
/// State name for which weather information should be retrieved
/// </param>
/// <returns>
/// A class adhereing to IWeather which will contain weather data for
/// the requested location
/// </returns>
public static IWeather GetWeather(string city, string state) {
return new WeatherAPI().getInstance(LocationSource.CityState, String.Format("{0}, {1}", city, state));
}
/// <summary>
/// Gets the weather for the given airport code
/// </summary>
/// <param name='airportCode'>
/// The Airport code for which weather information should be retrieved.
/// </param>
/// <returns>
/// A class adhereing to IWeather which will contain weather data for
/// the requested location
/// </returns>
public static IWeather GetWeather(string airportCode) {
return new WeatherAPI().getInstance(LocationSource.AirportCode, airportCode);
}
/// <summary>
/// Gets the weather for the given ZIP code
/// </summary>
/// <param name='zipCode'>
/// The ZIP code for which weather information should be retrieved.
/// </param>
/// <returns>
/// A class adhereing to IWeather which will contain weather data for
/// the requested location
/// </returns>
public static IWeather GetWeather(int zipCode) {
return new WeatherAPI().getInstance(LocationSource.ZipCode, String.Format("{0}", zipCode));
}
/// <summary>
/// Gets the weather for the given latitude and longitude
/// </summary>
/// <param name='latitude'>
/// The latitude coordinate for which weather information should be
/// retrieved.
/// </param>
/// <param name='longitude'>
/// The latitude coordinate for which weather information should be
/// retrieved.
/// </param>
/// <returns>
/// A class adhereing to IWeather which will contain weather data for
/// the requested location
/// </returns>
public static IWeather GetWeather(double latitude, double longitude) {
return new WeatherAPI().getInstance(LocationSource.LatitudeLongitude, String.Format("{0},{1}", latitude, longitude));
}
private List<WeatherProvider> _providers;
/// <summary>
/// Initializes a new instance of the WeatherAPI class. All providers
/// discovered via reflection and added to a List for use in
/// getInstance
/// </summary>
private WeatherAPI() {
_providers = new List<WeatherProvider>();
Assembly assembly = Assembly.Load("WeatherAPI");
Type[] assemblyTypes = assembly.GetTypes();
foreach (Type t in assemblyTypes) {
if (t.Namespace.Contains("WeatherAPI.Providers") &&
!t.IsAbstract &&
t.IsClass &&
Activator.CreateInstance(t) is WeatherProvider &&
((WeatherProvider)Activator.CreateInstance(t)).IsAvailable()) {
_providers.Add((WeatherProvider)Activator.CreateInstance(t));
}
}
}
/// <summary>
/// Factory method for obtaining an instance of a provider
/// </summary>
/// <param name='sourceType'>
/// Type of location that weather data will be retrieved from.
/// </param>
/// <param name='source'>
/// The string value of the source to give to the provider.
/// </param>
/// <returns>
/// An instance of IWeather containing weather data from the provider.
/// </returns>
/// <exception cref='ArgumentException'>
/// Is thrown when the provider cannot fetch weather data for the
/// LocationSource provided.
/// </exception>
private IWeather getInstance(LocationSource sourceType, string source) {
// Go through the available providers until we get one that can fulfill the request
foreach (WeatherProvider provider in _providers) {
if (provider.Supports(sourceType)) {
provider.Location = source;
provider.Source = sourceType;
provider.Update();
return (IWeather)provider;
}
}
// No providers can fullfill the request
throw new ArgumentException(String.Format("No available provider supports a {0} source", source));
}
}
}