public static TEntity CloneFrom <TEntity>(
this TEntity self,
DynamicEntity source,
bool overwrite = false,
bool recursive = false,
params DynamicPath[] ignore) where TEntity : DynamicEntity
{
var path = new DynamicPath();
cloneFrom(self, source, overwrite, recursive, path, ignore);
return(self);
}
static void cloneFrom(DynamicEntity self, DynamicEntity source, bool overwrite, bool recursive, DynamicPath path, DynamicPath[] ignore)
{
var pairs = compileKeys(source).ToArray();
foreach (var pair in pairs)
{
if (self.ContainsKey(pair.Key) && !overwrite)
{
continue;
}
path.Push(pair.Key);
if (ignore.Any(i => i.Equals(path)))
{
goto next;
}
if (!tryGetValue(pair, out var value))
{
continue;
}
if (value.IsCollectionOf <DynamicEntity>(out var items) && recursive)
{
value = cloneDynamicBaseEntityCollection(pair.Key, items);
self.SetValue(pair.Key, value);
goto next;
}
if (!(value is DynamicEntity entity))
{
self.SetValue(pair.Key, value);
goto next;
}
if (!recursive)
{
goto next;
}
value = cloneDynamicEntity(entity, true, path, ignore);
self.SetValue(pair.Key, value);
next:
path.Pop();
}
bool tryGetValue(KeyValuePair <string, object> kvp, out object value)
{
value = null;
if (kvp.Value is PropertyInfo property)
{
if (!property.CanRead)
{
return(false);
}
value = property.GetValue(source, new object[0]);
return(true);
}
value = kvp.Value;
return(true);
}
IEnumerable cloneDynamicBaseEntityCollection(string key, IEnumerable items)
{
Type type;
var prop = source.GetPropertyWithJsonPropertyName(key);
if (prop is null)
{
type = source[key].GetType();
}
else
{
var implementedAs = prop.GetCustomAttribute <ImplementedAsAttribute>();
type = implementedAs != null ? implementedAs.Type : typeof(List <DynamicEntity>);
}
IList list;
var isArray = false;
if (type.IsAssignableFrom(typeof(IList)))
{
list = (IList)Activator.CreateInstance(type);
}
else if (typeof(Array).IsAssignableFrom(type))
{
isArray = true;
list = new List <DynamicEntity>();
}
else
{
throw new NotImplementedException($"Cannot clone collection of type {type}");
}
foreach (DynamicEntity item in items)
{
var cloned = item.Clone(item.GetType());
list.Add(cloned);
}
if (!isArray)
{
return(list);
}
var array = new DynamicEntity[list.Count];
var i = 0;
foreach (var item in list)
{
array[i++] = (DynamicEntity)item;
}
return(array);
}
}
static DynamicEntity cloneDynamicEntity(DynamicEntity entity, bool recursive, DynamicPath path, DynamicPath[] ignore)
{
var type = entity.GetType();
var ctors = type.GetConstructors();
var emptyCtor = ctors.FirstOrDefault(c => c.GetParameters().Length == 0);
if (emptyCtor == null)
{
throw new NotImplementedException("Consider looking up ctor with params matching properties names & types"); // todo
}
var cloned = (DynamicEntity)emptyCtor.Invoke(new object[0]);
cloneFrom(cloned, entity, false, recursive, path, ignore);
return(cloned);
}
/// <summary>
/// Determines whether the specified value is equal to the current value.
/// </summary>
/// <param name="other">
/// A <see cref="DynamicPath"/> value to compare to this value.
/// </param>
/// <param name="stringComparison">
/// Specifies the string comparison strategy.
/// </param>
/// <returns>
/// <c>true</c> if <paramref name="other"/> is equal to the current value; otherwise <c>false</c>.
/// </returns>
public bool Equals(DynamicPath other, StringComparison stringComparison = StringComparison.InvariantCulture)
{
return(!(other is null) && string.Equals(StringValue, other.StringValue, stringComparison));
}
