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Added DeepCopy

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This commit is contained in:
Ellpeck 2020-07-31 20:24:59 +02:00
parent ba24707b18
commit cb369dec75
2 changed files with 59 additions and 11 deletions
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51
MLEM.Data/CopyExtensions.cs
View file

@ -16,13 +16,27 @@ namespace MLEM.Data {
/// <typeparam name="T">The type of the object to copy</typeparam>
/// <returns>A shallow copy of the object</returns>
public static T Copy<T>(this T obj, BindingFlags flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic) {
var copy = (T) typeof(T).GetConstructor(Type.EmptyTypes).Invoke(null);
var copy = (T) Construct(typeof(T), flags);
obj.CopyInto(copy, flags);
return copy;
}
/// <summary>
/// Copies the given object <paramref name="obj"/> into the given object <see cref="otherObj"/>.
/// Creates a deep copy of the object and returns it.
/// Note that, for this to work correctly, <typeparamref name="T"/> needs to contain a parameterless constructor.
/// </summary>
/// <param name="obj">The object to create a deep copy of</param>
/// <param name="flags">The binding flags for field searching</param>
/// <typeparam name="T">The type of the object to copy</typeparam>
/// <returns>A deep copy of the object</returns>
public static T DeepCopy<T>(this T obj, BindingFlags flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic) {
var copy = (T) Construct(typeof(T), flags);
obj.DeepCopyInto(copy, flags);
return copy;
}
/// <summary>
/// Copies the given object <paramref name="obj"/> into the given object <see cref="otherObj"/> in a shallow manner.
/// </summary>
/// <param name="obj">The object to create a shallow copy of</param>
/// <param name="otherObj">The object to copy into</param>
@ -33,5 +47,38 @@ namespace MLEM.Data {
field.SetValue(otherObj, field.GetValue(obj));
}
/// <summary>
/// Copies the given object <paramref name="obj"/> into the given object <see cref="otherObj"/> in a deep manner.
/// Note that, for this to work correctly, each type that should be constructed below the topmost level needs to contanin a parameterless constructor.
/// </summary>
/// <param name="obj">The object to create a deep copy of</param>
/// <param name="otherObj">The object to copy into</param>
/// <param name="flags">The binding flags for field searching</param>
/// <typeparam name="T">The type of the object to copy</typeparam>
public static void DeepCopyInto<T>(this T obj, T otherObj, BindingFlags flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic) {
foreach (var field in obj.GetType().GetFields(flags)) {
var val = field.GetValue(obj);
if (field.FieldType.IsValueType) {
// if we're a value type (struct or primitive), we can just set the value
field.SetValue(otherObj, val);
} else if (val != null) {
var otherVal = field.GetValue(otherObj);
// if the object we want to copy into doesn't have a value yet, we create one
if (otherVal == null) {
otherVal = Construct(field.FieldType, flags);
field.SetValue(otherObj, otherVal);
}
val.DeepCopyInto(otherVal, flags);
} else {
// if the value is null, we ensure that the value of the resulting object is also reset
field.SetValue(otherObj, null);
}
}
}
private static object Construct(Type t, BindingFlags flags) {
return t.GetConstructor(flags, null, Type.EmptyTypes, null).Invoke(null);
}
}
}

19
Sandbox/GameImpl.cs
View file

@ -92,17 +92,19 @@ namespace Sandbox {
var obj = new Test {
Vec = new Vector2(10, 20),
Point = new Point(20, 30),
Rectangle = new Rectangle(1, 2, 3, 4),
RectangleF = new RectangleF(4, 5, 6, 7).ToMlem(),
Dir = Direction2.Left
Dir = Direction2.Left,
OtherTest = new Test {
Vec = new Vector2(70, 30),
Dir = Direction2.Right
}
};
Console.WriteLine(obj);
var copy = obj.Copy();
var copy = obj.DeepCopy();
Console.WriteLine(copy);
var intoCopy = new Test();
obj.CopyInto(intoCopy);
var intoCopy = new Test {OtherTest = new Test()};
obj.DeepCopyInto(intoCopy);
Console.WriteLine(intoCopy);
var writer = new StringWriter();
@ -214,12 +216,11 @@ namespace Sandbox {
public Vector2 Vec;
public Point Point;
public Rectangle Rectangle;
public MLEM.Misc.RectangleF RectangleF;
public Direction2 Dir { get; set; }
public Test OtherTest;
public override string ToString() {
return $"{nameof(this.Vec)}: {this.Vec}, {nameof(this.Point)}: {this.Point}, {nameof(this.Rectangle)}: {this.Rectangle}, {nameof(this.RectangleF)}: {this.RectangleF}, {nameof(this.Dir)}: {this.Dir}";
return $"{this.GetHashCode()}: {nameof(this.Vec)}: {this.Vec}, {nameof(this.Point)}: {this.Point}, {nameof(this.OtherTest)}: {this.OtherTest}, {nameof(this.Dir)}: {this.Dir}";
}
}