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Allow copying to exclude certain fields

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Ellpeck 2020-08-01 00:22:29 +02:00
parent 0529e2c921
commit 3a1b73934b
1 changed files with 18 additions and 8 deletions
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26
MLEM.Data/CopyExtensions.cs
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@ -7,17 +7,20 @@ namespace MLEM.Data {
/// </summary>
public static class CopyExtensions {
private const BindingFlags DefaultFlags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
/// <summary>
/// Creates a shallow 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 shallow copy of</param>
/// <param name="flags">The binding flags for field searching</param>
/// <param name="fieldInclusion">A predicate that determines whether or not the given field should be copied. If null, all fields will be copied.</param>
/// <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) {
public static T Copy<T>(this T obj, BindingFlags flags = DefaultFlags, Predicate<FieldInfo> fieldInclusion = null) {
var copy = (T) Construct(typeof(T), flags);
obj.CopyInto(copy, flags);
obj.CopyInto(copy, flags, fieldInclusion);
return copy;
}
@ -27,11 +30,12 @@ namespace MLEM.Data {
/// </summary>
/// <param name="obj">The object to create a deep copy of</param>
/// <param name="flags">The binding flags for field searching</param>
/// <param name="fieldInclusion">A predicate that determines whether or not the given field should be copied. If null, all fields will be copied.</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) {
public static T DeepCopy<T>(this T obj, BindingFlags flags = DefaultFlags, Predicate<FieldInfo> fieldInclusion = null) {
var copy = (T) Construct(typeof(T), flags);
obj.DeepCopyInto(copy, flags);
obj.DeepCopyInto(copy, flags, fieldInclusion);
return copy;
}
@ -41,10 +45,13 @@ namespace MLEM.Data {
/// <param name="obj">The object to create a shallow copy of</param>
/// <param name="otherObj">The object to copy into</param>
/// <param name="flags">The binding flags for field searching</param>
/// <param name="fieldInclusion">A predicate that determines whether or not the given field should be copied. If null, all fields will be copied.</param>
/// <typeparam name="T">The type of the object to copy</typeparam>
public static void CopyInto<T>(this T obj, T otherObj, BindingFlags flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic) {
foreach (var field in typeof(T).GetFields(flags))
field.SetValue(otherObj, field.GetValue(obj));
public static void CopyInto<T>(this T obj, T otherObj, BindingFlags flags = DefaultFlags, Predicate<FieldInfo> fieldInclusion = null) {
foreach (var field in typeof(T).GetFields(flags)) {
if (fieldInclusion == null || fieldInclusion(field))
field.SetValue(otherObj, field.GetValue(obj));
}
}
/// <summary>
@ -54,9 +61,12 @@ namespace MLEM.Data {
/// <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>
/// <param name="fieldInclusion">A predicate that determines whether or not the given field should be copied. If null, all fields will be copied.</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) {
public static void DeepCopyInto<T>(this T obj, T otherObj, BindingFlags flags = DefaultFlags, Predicate<FieldInfo> fieldInclusion = null) {
foreach (var field in obj.GetType().GetFields(flags)) {
if (fieldInclusion != null && !fieldInclusion(field))
continue;
var val = field.GetValue(obj);
if (val == null || field.FieldType.IsValueType) {
// if we're a value type (struct or primitive) or null, we can just set the value