eb3083cf9e
git-svn-id: file:///srv/devel/repo-conversion/nusu@223 d2e56fa2-650e-0410-a79f-9358c0239efd
430 lines
20 KiB
C#
430 lines
20 KiB
C#
#region CPL License
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/*
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Nuclex Framework
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Copyright (C) 2002-2010 Nuclex Development Labs
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This library is free software; you can redistribute it and/or
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modify it under the terms of the IBM Common Public License as
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published by the IBM Corporation; either version 1.0 of the
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License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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IBM Common Public License for more details.
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You should have received a copy of the IBM Common Public
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License along with this library
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*/
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#endregion
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using System;
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using System.Reflection;
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namespace Nuclex.Support.Cloning {
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// TODO: Doesn't clone arrays yet
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/// <summary>Clones objects using reflection</summary>
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public class ReflectionCloner : ICloneFactory, IStateCopier {
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/// <summary>
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/// Creates a shallow clone of the specified object, reusing any referenced objects
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/// </summary>
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/// <typeparam name="TCloned">Type of the object that will be cloned</typeparam>
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/// <param name="objectToClone">Object that will be cloned</param>
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/// <param name="usePropertyBasedClone">
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/// Whether to clone the object based on its properties only
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/// </param>
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/// <returns>A shallow clone of the provided object</returns>
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public TCloned ShallowClone<TCloned>(TCloned objectToClone, bool usePropertyBasedClone) {
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if(typeof(TCloned).IsValueType) {
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TCloned clone = Activator.CreateInstance<TCloned>();
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if(usePropertyBasedClone) {
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shallowCopyValueTypePropertyBased<TCloned>(ref objectToClone, ref clone);
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} else {
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shallowCopyValueTypeFieldBased<TCloned>(ref objectToClone, ref clone);
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}
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return clone;
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} else {
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TCloned clone = (TCloned)Activator.CreateInstance(objectToClone.GetType());
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if(usePropertyBasedClone) {
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shallowCopyReferenceTypePropertyBased(objectToClone.GetType(), objectToClone, clone);
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} else {
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shallowCopyReferenceTypeFieldBased(objectToClone.GetType(), objectToClone, clone);
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}
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return clone;
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}
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}
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/// <summary>
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/// Creates a deep clone of the specified object, also creating clones of all
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/// child objects being referenced
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/// </summary>
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/// <typeparam name="TCloned">Type of the object that will be cloned</typeparam>
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/// <param name="objectToClone">Object that will be cloned</param>
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/// <param name="usePropertyBasedClone">
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/// Whether to clone the object based on its properties only
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/// </param>
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/// <returns>A deep clone of the provided object</returns>
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public TCloned DeepClone<TCloned>(TCloned objectToClone, bool usePropertyBasedClone) {
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if(typeof(TCloned).IsValueType) {
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TCloned clone = Activator.CreateInstance<TCloned>();
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if(usePropertyBasedClone) {
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deepCopyValueTypePropertyBased<TCloned>(ref objectToClone, ref clone);
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} else {
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deepCopyValueTypeFieldBased<TCloned>(ref objectToClone, ref clone);
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}
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return clone;
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} else {
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TCloned clone = (TCloned)Activator.CreateInstance(objectToClone.GetType());
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if(usePropertyBasedClone) {
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deepCopyReferenceTypePropertyBased(objectToClone.GetType(), objectToClone, clone);
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} else {
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deepCopyReferenceTypeFieldBased(objectToClone.GetType(), objectToClone, clone);
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}
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return clone;
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}
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}
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/// <summary>Transfers the state of one object into another</summary>
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/// <typeparam name="TState">Type of the object whose sate will be transferred</typeparam>
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/// <param name="original">Original instance the state will be taken from</param>
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/// <param name="target">Target instance the state will be written to</param>
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/// <param name="propertyBased">Whether to perform a property-based state copy</param>
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public void ShallowCopyState<TState>(TState original, TState target, bool propertyBased)
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where TState : class {
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if(propertyBased) {
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shallowCopyReferenceTypePropertyBased(typeof(TState), original, target);
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} else {
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shallowCopyReferenceTypeFieldBased(typeof(TState), original, target);
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}
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}
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/// <summary>Transfers the state of one object into another</summary>
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/// <typeparam name="TState">Type of the object whose sate will be transferred</typeparam>
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/// <param name="original">Original instance the state will be taken from</param>
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/// <param name="target">Target instance the state will be written to</param>
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/// <param name="propertyBased">Whether to perform a property-based state copy</param>
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public void ShallowCopyState<TState>(
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ref TState original, ref TState target, bool propertyBased
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) where TState : struct {
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if(propertyBased) {
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shallowCopyValueTypePropertyBased<TState>(ref original, ref target);
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} else {
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shallowCopyValueTypeFieldBased<TState>(ref original, ref target);
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}
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}
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/// <summary>
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/// Transfers the state of one object into another, creating clones of referenced objects
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/// </summary>
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/// <typeparam name="TState">Type of the object whose sate will be transferred</typeparam>
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/// <param name="original">Original instance the state will be taken from</param>
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/// <param name="target">Target instance the state will be written to</param>
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/// <param name="propertyBased">Whether to perform a property-based state copy</param>
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public void DeepCopyState<TState>(TState original, TState target, bool propertyBased)
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where TState : class {
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if(propertyBased) {
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deepCopyReferenceTypePropertyBased(typeof(TState), original, target);
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} else {
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deepCopyReferenceTypeFieldBased(typeof(TState), original, target);
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}
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}
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/// <summary>
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/// Transfers the state of one object into another, creating clones of referenced objects
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/// </summary>
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/// <typeparam name="TState">Type of the object whose sate will be transferred</typeparam>
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/// <param name="original">Original instance the state will be taken from</param>
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/// <param name="target">Target instance the state will be written to</param>
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/// <param name="propertyBased">Whether to perform a property-based state copy</param>
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public void DeepCopyState<TState>(ref TState original, ref TState target, bool propertyBased)
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where TState : struct {
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if(propertyBased) {
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deepCopyValueTypePropertyBased<TState>(ref original, ref target);
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} else {
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deepCopyValueTypeFieldBased<TState>(ref original, ref target);
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}
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}
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/// <summary>Creates a field-based shallow copy of a reference type</summary>
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/// <param name="copiedType">Type the copy will be based upon</param>
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/// <param name="original">Original object that will be copied</param>
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/// <param name="target">Target object into which copied values will be written</param>
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private static void shallowCopyReferenceTypeFieldBased(
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Type copiedType, object original, object target
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) {
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FieldInfo[] fieldInfos = copiedType.GetFields(
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BindingFlags.Public | BindingFlags.NonPublic |
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BindingFlags.Instance | BindingFlags.FlattenHierarchy
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);
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for(int index = 0; index < fieldInfos.Length; ++index) {
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FieldInfo fieldInfo = fieldInfos[index];
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fieldInfo.SetValue(target, fieldInfo.GetValue(original));
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}
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}
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/// <summary>Creates a property-based shallow copy of a reference type</summary>
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/// <param name="copiedType">Type the copy will be based upon</param>
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/// <param name="original">Original object that will be copied</param>
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/// <param name="target">Target object into which copied values will be written</param>
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private static void shallowCopyReferenceTypePropertyBased(
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Type copiedType, object original, object target
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) {
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PropertyInfo[] propertyInfos = copiedType.GetProperties(
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BindingFlags.Public | BindingFlags.NonPublic |
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BindingFlags.Instance | BindingFlags.FlattenHierarchy
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);
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for(int index = 0; index < propertyInfos.Length; ++index) {
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PropertyInfo propertyInfo = propertyInfos[index];
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if(propertyInfo.CanRead && propertyInfo.CanWrite) {
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if(propertyInfo.PropertyType.IsPrimitive) {
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propertyInfo.SetValue(
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target,
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propertyInfo.GetValue(original, null),
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null
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);
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} else if(propertyInfo.PropertyType.IsValueType) {
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// Recurse into the value type - value types are seen as part of
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// the outer type and a shallow copy does follow their hierarchy.
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// This is equivalent to what would happen if you directly assign
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// one value type to another.
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object boxedOriginalValue = propertyInfo.GetValue(original, null);
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Type originalType = boxedOriginalValue.GetType();
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object boxedClonedValue = Activator.CreateInstance(originalType);
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shallowCopyReferenceTypePropertyBased(
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originalType, boxedOriginalValue, boxedClonedValue
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);
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propertyInfo.SetValue(target, boxedClonedValue, null);
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} else {
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propertyInfo.SetValue(
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target,
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propertyInfo.GetValue(original, null),
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null
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);
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}
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}
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}
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}
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/// <summary>Creates a property-based shallow copy of a value type</summary>
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/// <typeparam name="TState">Value type that will be copied</typeparam>
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/// <param name="original">Original object that will be copied</param>
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/// <param name="target">Target object into which copied values will be written</param>
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private static void shallowCopyValueTypePropertyBased<TState>(
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ref TState original, ref TState target
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) {
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object boxedOriginal = original;
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object boxedTarget = target;
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PropertyInfo[] propertyInfos = typeof(TState).GetProperties(
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BindingFlags.Public | BindingFlags.NonPublic |
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BindingFlags.Instance | BindingFlags.FlattenHierarchy
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);
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for(int index = 0; index < propertyInfos.Length; ++index) {
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PropertyInfo propertyInfo = propertyInfos[index];
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if(propertyInfo.CanRead && propertyInfo.CanWrite) {
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if(propertyInfo.PropertyType.IsPrimitive) {
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propertyInfo.SetValue(
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boxedTarget,
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propertyInfo.GetValue(boxedOriginal, null),
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null
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);
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} else if(propertyInfo.PropertyType.IsValueType) {
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object boxedOriginalValue = propertyInfo.GetValue(original, null);
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Type originalType = boxedOriginalValue.GetType();
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object boxedClonedValue = Activator.CreateInstance(originalType);
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deepCopyReferenceTypePropertyBased(
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originalType, boxedOriginalValue, boxedClonedValue
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);
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propertyInfo.SetValue(boxedTarget, boxedClonedValue, null);
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} else {
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propertyInfo.SetValue(
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boxedTarget,
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propertyInfo.GetValue(boxedOriginal, null),
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null
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);
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}
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}
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}
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target = (TState)boxedTarget;
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}
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/// <summary>Creates a field-based shallow copy of a value type</summary>
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/// <typeparam name="TState">Value type that will be copied</typeparam>
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/// <param name="original">Original object that will be copied</param>
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/// <param name="target">Target object into which copied values will be written</param>
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private static void shallowCopyValueTypeFieldBased<TState>(
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ref TState original, ref TState target
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) {
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target = original; // hehe
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}
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/// <summary>Creates a field-based deep copy of a reference type</summary>
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/// <param name="copiedType">Type the copy will be based upon</param>
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/// <param name="original">Original object that will be copied</param>
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/// <param name="target">Target object into which copied values will be written</param>
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private static void deepCopyReferenceTypeFieldBased(
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Type copiedType, object original, object target
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) {
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FieldInfo[] fieldInfos = copiedType.GetFields(
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BindingFlags.Public | BindingFlags.NonPublic |
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BindingFlags.Instance | BindingFlags.FlattenHierarchy
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);
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for(int index = 0; index < fieldInfos.Length; ++index) {
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FieldInfo fieldInfo = fieldInfos[index];
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if(fieldInfo.FieldType.IsPrimitive) {
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fieldInfo.SetValue(target, fieldInfo.GetValue(original));
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} else if(fieldInfo.FieldType.IsValueType) {
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object boxedOriginalValue = fieldInfo.GetValue(original);
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Type originalType = boxedOriginalValue.GetType();
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object boxedClonedValue = Activator.CreateInstance(originalType);
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deepCopyReferenceTypeFieldBased(originalType, boxedOriginalValue, boxedClonedValue);
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fieldInfo.SetValue(target, boxedClonedValue);
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} else {
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object originalValue = fieldInfo.GetValue(original);
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if(originalValue != null) {
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Type originalType = originalValue.GetType();
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object clonedValue = Activator.CreateInstance(originalType);
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deepCopyReferenceTypeFieldBased(originalType, originalValue, clonedValue);
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fieldInfo.SetValue(target, clonedValue);
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}
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}
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}
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}
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/// <summary>Creates a property-based deep copy of a reference type</summary>
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/// <param name="copiedType">Type the copy will be based upon</param>
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/// <param name="original">Original object that will be copied</param>
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/// <param name="target">Target object into which copied values will be written</param>
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private static void deepCopyReferenceTypePropertyBased(
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Type copiedType, object original, object target
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) {
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PropertyInfo[] propertyInfos = copiedType.GetProperties(
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BindingFlags.Public | BindingFlags.NonPublic |
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BindingFlags.Instance | BindingFlags.FlattenHierarchy
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);
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for(int index = 0; index < propertyInfos.Length; ++index) {
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PropertyInfo propertyInfo = propertyInfos[index];
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if(propertyInfo.CanRead && propertyInfo.CanWrite) {
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if(propertyInfo.PropertyType.IsPrimitive) {
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propertyInfo.SetValue(
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target,
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propertyInfo.GetValue(original, null),
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null
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);
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} else if(propertyInfo.PropertyType.IsValueType) {
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object boxedOriginalValue = propertyInfo.GetValue(original, null);
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Type originalType = boxedOriginalValue.GetType();
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object boxedClonedValue = Activator.CreateInstance(originalType);
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deepCopyReferenceTypePropertyBased(
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originalType, boxedOriginalValue, boxedClonedValue
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);
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propertyInfo.SetValue(target, boxedClonedValue, null);
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} else {
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object originalValue = propertyInfo.GetValue(original, null);
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if(originalValue != null) {
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Type originalType = originalValue.GetType();
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object clonedValue = Activator.CreateInstance(originalType);
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deepCopyReferenceTypePropertyBased(
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originalType, originalValue, clonedValue
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);
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propertyInfo.SetValue(target, clonedValue, null);
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}
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}
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}
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}
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}
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/// <summary>Creates a field-based deep copy of a value type</summary>
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/// <typeparam name="TState">Value type that will be copied</typeparam>
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/// <param name="original">Original object that will be copied</param>
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/// <param name="target">Target object into which copied values will be written</param>
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private static void deepCopyValueTypeFieldBased<TState>(
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ref TState original, ref TState target
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) {
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object boxedOriginal = original;
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object boxedTarget = Activator.CreateInstance(original.GetType());
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FieldInfo[] fieldInfos = typeof(TState).GetFields(
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BindingFlags.Public | BindingFlags.NonPublic |
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BindingFlags.Instance | BindingFlags.FlattenHierarchy
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);
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for(int index = 0; index < fieldInfos.Length; ++index) {
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FieldInfo fieldInfo = fieldInfos[index];
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if(fieldInfo.FieldType.IsPrimitive) {
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object boxedValue = fieldInfo.GetValue(boxedOriginal);
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fieldInfo.SetValue(boxedTarget, boxedValue);
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} else if(fieldInfo.FieldType.IsValueType) {
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object boxedOriginalValue = fieldInfo.GetValue(boxedOriginal);
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Type originalType = boxedOriginalValue.GetType();
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object boxedClonedValue = Activator.CreateInstance(originalType);
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deepCopyReferenceTypeFieldBased(originalType, boxedOriginalValue, boxedClonedValue);
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fieldInfo.SetValue(boxedTarget, boxedClonedValue);
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} else {
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object originalValue = fieldInfo.GetValue(boxedOriginal);
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if(originalValue != null) {
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Type originalType = originalValue.GetType();
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object clonedValue = Activator.CreateInstance(originalType);
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deepCopyReferenceTypeFieldBased(originalType, originalValue, clonedValue);
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fieldInfo.SetValue(boxedTarget, clonedValue);
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}
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}
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}
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target = (TState)boxedTarget;
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}
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/// <summary>Creates a property-based shallow copy of a value type</summary>
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/// <typeparam name="TState">Value type that will be copied</typeparam>
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/// <param name="original">Original object that will be copied</param>
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/// <param name="target">Target object into which copied values will be written</param>
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private static void deepCopyValueTypePropertyBased<TState>(
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ref TState original, ref TState target
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) {
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object boxedOriginal = original;
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object boxedTarget = Activator.CreateInstance(original.GetType());
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PropertyInfo[] propertyInfos = typeof(TState).GetProperties(
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BindingFlags.Public | BindingFlags.NonPublic |
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BindingFlags.Instance | BindingFlags.FlattenHierarchy
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);
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for(int index = 0; index < propertyInfos.Length; ++index) {
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PropertyInfo propertyInfo = propertyInfos[index];
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if(propertyInfo.CanRead && propertyInfo.CanWrite) {
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if(propertyInfo.PropertyType.IsPrimitive) {
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propertyInfo.SetValue(
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boxedTarget,
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propertyInfo.GetValue(boxedOriginal, null),
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null
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);
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} else if(propertyInfo.PropertyType.IsValueType) {
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object boxedOriginalValue = propertyInfo.GetValue(boxedOriginal, null);
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Type originalType = boxedOriginalValue.GetType();
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object boxedClonedValue = Activator.CreateInstance(originalType);
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deepCopyReferenceTypePropertyBased(
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originalType, boxedOriginalValue, boxedClonedValue
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);
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propertyInfo.SetValue(boxedTarget, boxedClonedValue, null);
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} else {
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object originalValue = propertyInfo.GetValue(boxedOriginal, null);
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if(originalValue != null) {
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Type originalType = originalValue.GetType();
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object clonedValue = Activator.CreateInstance(originalType);
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deepCopyReferenceTypePropertyBased(originalType, originalValue, clonedValue);
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propertyInfo.SetValue(boxedTarget, clonedValue, null);
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}
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}
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}
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}
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target = (TState)boxedTarget;
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}
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}
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} // namespace Nuclex.Support.Cloning
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