/// <summary>
/// Searches for a max axle load tag and returns the associated value.
///
/// http://wiki.openstreetmap.org/wiki/Key:maxaxleload
/// </summary>
public static bool TryGetMaxAxleLoad(this IAttributeCollection tags, out float kilogram)
{
kilogram = float.MaxValue;
string tagValue;
if (tags == null || !tags.TryGetValue("maxaxleload", out tagValue) || string.IsNullOrWhiteSpace(tagValue))
{
return(false);
}
return(IAttributeCollectionExtension.TryParseWeight(tagValue, out kilogram));
}
/// <summary>
/// Searches for a maxspeed tag and returns the associated value.
///
/// http://wiki.openstreetmap.org/wiki/Key:maxspeed
/// </summary>
public static bool TryGetMaxSpeed(this IAttributeCollection attributes, out float kmPerHour)
{
kmPerHour = float.MaxValue;
string tagValue;
if (attributes == null || !attributes.TryGetValue("maxspeed", out tagValue) || string.IsNullOrWhiteSpace(tagValue) ||
tagValue == "none" || tagValue == "signals" || tagValue == "signs" || tagValue == "no")
{
return(false);
}
return(IAttributeCollectionExtension.TryParseSpeed(tagValue, out kmPerHour));
}
/// <summary>
/// Searches for a max width tag and returns the associated value.
///
/// http://wiki.openstreetmap.org/wiki/Key:maxwidth
/// </summary>
/// <param name="attributes">The tags to search.</param>
/// <param name="meter"></param>
/// <returns></returns>
public static bool TryGetMaxWidth(this IAttributeCollection attributes, out float meter)
{
meter = float.MaxValue;
string tagValue;
if (attributes == null || !attributes.TryGetValue("maxwidth", out tagValue) || string.IsNullOrWhiteSpace(tagValue))
{
return(false);
}
return(IAttributeCollectionExtension.TryParseLength(tagValue, out meter));
}
/// <summary>
/// Tries to parse a speed value from a given tag-value.
/// </summary>
public static bool TryParseSpeed(string s, out float kmPerHour)
{
kmPerHour = float.MaxValue;
if (string.IsNullOrWhiteSpace(s))
{
return(false);
}
if (s[0] != '0' && s[0] != '1' && s[0] != '2' && s[0] != '3' && s[0] != '4' &&
s[0] != '5' && s[0] != '6' && s[0] != '7' && s[0] != '8' && s[0] != '9')
{ // performance improvement, quick negative answer.
return(false);
}
if (s.Contains(","))
{ // refuse comma as a decimal seperator or anywhere else in the number.
return(false);
}
// try regular speed: convention in OSM is km/h in this case.
if (float.TryParse(s, NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture, out kmPerHour))
{
return(true);
}
// try km/h
if (IAttributeCollectionExtension.TryParseKilometerPerHour(s, out kmPerHour))
{
return(true);
}
// try mph.
float milesPerHour;
if (IAttributeCollectionExtension.TryParseMilesPerHour(s, out milesPerHour))
{
kmPerHour = milesPerHour * 1.60934f;
return(true);
}
// try knots.
float resultKnots;
if (IAttributeCollectionExtension.TryParseKnots(s, out resultKnots))
{
kmPerHour = resultKnots * 1.85200f;
return(true);
}
return(false);
}
/// <summary>
/// Searches for a max height tag and returns the associated value.
///
/// http://wiki.openstreetmap.org/wiki/Maxheight
/// </summary>
public static bool TryGetMaxHeight(this IReadonlyAttributeCollection tags, out float meter)
{
meter = float.MaxValue;
string tagValue;
if (tags == null || !tags.TryGetValue("maxheight", out tagValue) || string.IsNullOrWhiteSpace(tagValue))
{
return(false);
}
return(IAttributeCollectionExtension.TryParseLength(tagValue, out meter));
}