/// <summary>
/// Save an object in the source object's extension dictionary.
/// </summary>
/// <typeparam name="T">The type of the object to store.</typeparam>
/// <param name="source">The source object to write the object to.</param>
/// <param name="key">A string that acts as the key in the extension dictionary.</param>
/// <param name="data">The object to store.</param>
/// <exception cref="System.Exception">Thrown when an AutoCAD error occurs.</exception>
public static void SaveData <T>(this DBObject source, string key, T data)
{
Require.ParameterNotNull(source, nameof(source));
void saveData(ResultBuffer buffer)
{
if (!source.IsWriteEnabled)
{
source.UpgradeOpen();
}
if (source.ExtensionDictionary.IsNull)
{
source.CreateExtensionDictionary();
}
Helpers.WrapInTransaction(source, tr =>
{
var dict = (DBDictionary)tr.GetObject(source.ExtensionDictionary, OpenMode.ForWrite);
if (dict.Contains(key))
{
var xRecord = (Xrecord)tr.GetObject(dict.GetAt(key), OpenMode.ForWrite);
xRecord.Data = buffer;
}
else
{
var xRecord = new Xrecord();
xRecord.Data = buffer;
dict.SetAt(key, xRecord);
tr.AddNewlyCreatedDBObject(xRecord, true);
}
});
}
ResultBuffer getResultBuffer(DxfCode code) => new ResultBuffer(new[] { new TypedValue((int)code, data) });
// TODO: Add further types
if (typeof(T) == typeof(bool))
{
saveData(getResultBuffer(DxfCode.Bool));
}
else if (typeof(T) == typeof(double))
{
saveData(getResultBuffer(DxfCode.Real));
}
else if (typeof(T) == typeof(byte))
{
saveData(getResultBuffer(DxfCode.Int8));
}
else if (typeof(T) == typeof(char) ||
typeof(T) == typeof(short))
{
saveData(getResultBuffer(DxfCode.Int16));
}
else if (typeof(T) == typeof(int))
{
saveData(getResultBuffer(DxfCode.Int32));
}
else if (typeof(T) == typeof(long))
{
saveData(getResultBuffer(DxfCode.Int64));
}
else if (typeof(T) == typeof(string))
{
saveData(getResultBuffer(DxfCode.Text));
}
else
{
saveData(new ResultBuffer(Helpers.Serialize(data)
.Select(a => new TypedValue((int)DxfCode.BinaryChunk, a))
.ToArray()));
}
}
/// <summary>
/// Reads an object from the source object's XData.
/// </summary>
/// <typeparam name="T">The type of the object to read.</typeparam>
/// <param name="source">The source object to read the object from.</param>
/// <param name="regAppName">The name of the RegApp to read the data from.</param>
/// <exception cref="System.Exception">Thrown when an AutoCAD error occurs.</exception>
/// <returns>The object in the extension dictionary.</returns>
private static T GetFromXData <T>(DBObject source, string regAppName)
{
var resultBuffer = source.GetXDataForApplication(regAppName);
Require.ObjectNotNull(resultBuffer, $"RegApp '{regAppName}' not found");
using (resultBuffer)
{
var xData = resultBuffer.Cast <TypedValue>()
.Skip(1)
.ToArray();
var targetType = typeof(T);
var enumerable = typeof(T).GetInterface(typeof(IEnumerable <>).Name);
if (typeof(T).Equals(typeof(string)))
{
enumerable = null;
}
else if (enumerable != null)
{
targetType = enumerable.GenericTypeArguments
.FirstOrDefault();
}
var tmpValues = new List <object>();
CollectValues(xData, tmpValues, targetType);
var values = tmpValues.ToArray();
if (values.Length == 1 && values[0] is object[])
{
values = values[0] as object[];
}
if (enumerable != null)
{
if (targetType == typeof(object))
{
return((T)(object)values);
}
else
{
var newValues = (IList)Activator.CreateInstance(typeof(List <>).MakeGenericType(targetType));
foreach (var value in values)
{
if (typeof(T).Equals(typeof(Vector3d)))
{
var tmp = (Point3d)value;
newValues.Add(new Vector3d(tmp.X, tmp.Y, tmp.Z));
}
else
{
newValues.Add(value);
}
}
return((T)newValues);
}
}
else if (values.Length == 1)
{
return((T)values[0]);
}
else
{
if (typeof(T).Equals(typeof(object)))
{
return((T)(object)values);
}
else
{
throw new Exception("XData contains multiple: " + values.GetType().Name + " cannot be converted to " + typeof(T).Name);
}
}
}
}
