#region License
/*
* Copyright 2002-2004 the original author or authors.
*
* 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.
*/
#endregion
using System;
using System.Globalization;
using System.Threading;
using System.Web;
using Spring.Util;
namespace Spring.Globalization.Resolvers{
/// <summary>
/// Default culture resolver for web applications. Contains some common utility methods for web culture resolvers.
/// </summary>
/// <author>Aleksandar Seovic</author>
public class DefaultWebCultureResolver : DefaultCultureResolver
{
/// <summary>
/// Returns default culture. If <see cref="DefaultCultureResolver.DefaultCulture"/> property is not set,
/// it tries to get culture from the request headers
/// and falls back to a current thread's culture if no headers are available.
/// </summary>
/// <returns>Default culture to use.</returns>
protected override CultureInfo GetDefaultLocale()
{
if (DefaultCulture != null)
{
return base.DefaultCulture;
}
CultureInfo culture = GetCulture(GetRequestLanguage());
if (culture != null)
{
return culture;
}
return Thread.CurrentThread.CurrentUICulture;
}
/// <summary>
/// Extracts the users favorite language from "accept-language" header of the current request.
/// </summary>
/// <returns>a language string if any or <c>null</c>, if no languages have been sent with the request</returns>
protected virtual string GetRequestLanguage()
{
HttpContext context = HttpContext.Current;
if (context != null && context.Request != null && ArrayUtils.HasLength(context.Request.UserLanguages))
{
return context.Request.UserLanguages[0];
}
return null;
}
/// <summary>
/// Resolves a culture by name.
/// </summary>
/// <param name="cultureName">the name of the culture to get</param>
/// <returns>a (possible neutral!) <see cref="CultureInfo"/> or <c>null</c>, if culture could not be resolved</returns>
public CultureInfo GetCulture(string cultureName)
{
try { return new CultureInfo(cultureName.Split(';')[0]); } catch { }
return null;
}
/// <summary>
/// Resolves the culture from the context.
/// </summary>
/// <returns>Culture that should be used to render view.</returns>
public override CultureInfo ResolveCulture()
{
return GetDefaultLocale();
}
/// <summary>
/// Not supported for this implementation.
/// </summary>
/// <param name="culture">The new culture or <code>null</code> to clear the culture.</param>
public override void SetCulture(CultureInfo culture)
{
throw new NotSupportedException("Cannot change a default culture in a web application - use a different culture resolution strategy.");
}
}
}
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