bool MIMETypeRegistry::isSupportedMediaMIMEType(const String& mimeType)
{
    if (mimeType.isEmpty())
        return false;
    if (!supportedMediaMIMETypes)
        initializeSupportedMediaMIMETypes();
    return supportedMediaMIMETypes->contains(mimeType);
}
HashSet<String>& MIMETypeRegistry::getSupportedMediaMIMETypes()
{
    if (!supportedMediaMIMETypes)
        initializeSupportedMediaMIMETypes();
    return *supportedMediaMIMETypes;
}
HashSet<String, ASCIICaseInsensitiveHash>& MIMETypeRegistry::getSupportedMediaMIMETypes()
{
    if (!supportedMediaMIMETypes)
        initializeSupportedMediaMIMETypes();
    return *supportedMediaMIMETypes;
}