/// <summary>
/// Deserializes from the given stream, returns an optimized index.
/// </summary>
public static MappedAttributesIndex Deserialize(Stream stream, MappedAttributesIndexProfile profile)
{
var version = stream.ReadByte();
if (version > 1)
{
throw new Exception(string.Format("Cannot deserialize mapped attributes index: Invalid version #: {0}, upgrade Itinero.", version));
}
var bytes = new byte[4];
stream.Read(bytes, 0, 4);
var length = BitConverter.ToUInt32(bytes, 0);
ArrayBase <uint> data;
if (profile == null || profile.DataProfile == null)
{
data = Context.ArrayFactory.CreateMemoryBackedArray <uint>(length);
data.CopyFrom(stream);
}
else
{
var position = stream.Position;
var map = new MemoryMapStream(new CappedStream(stream, position,
length * 4));
data = new Array <uint>(map.CreateUInt32(length), profile.DataProfile);
stream.Seek(length * 4, SeekOrigin.Current);
}
var attributes = AttributesIndex.Deserialize(new LimitedStream(stream, stream.Position), true);
return(new MappedAttributesIndex(data, attributes));
}
/// <summary>
/// Used for deserialization.
/// </summary>
private MappedAttributesIndex(ArrayBase <uint> data, AttributesIndex attributes)
{
_data = data;
_pointer = (int)_data.Length;
_attributes = attributes;
_reverseIndex = null;
}
/// <summary>
/// Creates a new mapped attributes index.
/// </summary>
public MappedAttributesIndex(AttributesIndexMode mode = AttributesIndexMode.ReverseCollectionIndex |
AttributesIndexMode.ReverseStringIndex)
{
_data = new MemoryArray <uint>(1024);
_attributes = new AttributesIndex(mode);
_reverseIndex = new HugeDictionary <uint, int>();
for (var p = 0; p < _data.Length; p++)
{
_data[p] = _NO_DATA;
}
}
/// <summary>
/// Adds a new tag collection.
/// </summary>
public static uint Add(this AttributesIndex index, params Attribute[] attributes)
{
return(index.Add(new AttributeCollection(attributes)));
}
/// <summary>
/// Adds a new attributes collection.
/// </summary>
public static uint Add(this AttributesIndex index, IEnumerable <Attribute> attributes)
{
return(index.Add(new AttributeCollection(attributes)));
}