Source/WebCore/platform/Language.cpp

/*
 * Copyright (C) 2010 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "Language.h"

#include "PlatformString.h"
#include <wtf/HashMap.h>

namespace WebCore {

typedef HashMap<void*, LanguageChangeObserverFunction> ObserverMap;
static ObserverMap& observerMap()
{
    DEFINE_STATIC_LOCAL(ObserverMap, map, ());
    return map;
}

void addLanguageChangeObserver(void* context, LanguageChangeObserverFunction customObserver)
{
    observerMap().set(context, customObserver);
}

void removeLanguageChangeObserver(void* context)
{
    ASSERT(observerMap().contains(context));
    observerMap().remove(context);
}

void languageDidChange()
{
    ObserverMap::iterator end = observerMap().end();
    for (ObserverMap::iterator iter = observerMap().begin(); iter != end; ++iter)
        iter->second(iter->first);
}

String defaultLanguage()
{
    Vector<String> languages = userPreferredLanguages();
    if (languages.size())
        return languages[0];

    return emptyString();
}

static Vector<String>& preferredLanguagesOverride()
{
    DEFINE_STATIC_LOCAL(Vector<String>, override, ());
    return override;
}

void overrideUserPreferredLanguages(const Vector<String>& override)
{
    preferredLanguagesOverride() = override;
}
    
Vector<String> userPreferredLanguages()
{
    Vector<String>& override = preferredLanguagesOverride();
    if (!override.isEmpty())
        return override;
    
    return platformUserPreferredLanguages();
}

}