Expression tree cloner now clones nested reference types
git-svn-id: file:///srv/devel/repo-conversion/nusu@233 d2e56fa2-650e-0410-a79f-9358c0239efd
This commit is contained in:
Markus Ewald
parent
79063f59c1
commit
3267e399ee
|
|
@ -27,43 +27,43 @@ using NUnit.Framework;
|
|||
|
||||
namespace Nuclex.Support.Cloning {
|
||||
|
||||
/// <summary>Unit Test for the expression tree-based cloner</summary>
|
||||
[TestFixture]
|
||||
public class ExpressionTreeClonerTest : CloneFactoryTest {
|
||||
/// <summary>Unit Test for the expression tree-based cloner</summary>
|
||||
[TestFixture]
|
||||
public class ExpressionTreeClonerTest : CloneFactoryTest {
|
||||
|
||||
/// <summary>Initializes a new unit test suite for the reflection cloner</summary>
|
||||
public ExpressionTreeClonerTest() {
|
||||
this.cloneFactory = new ExpressionTreeCloner();
|
||||
}
|
||||
/// <summary>Initializes a new unit test suite for the reflection cloner</summary>
|
||||
public ExpressionTreeClonerTest() {
|
||||
this.cloneFactory = new ExpressionTreeCloner();
|
||||
}
|
||||
|
||||
/// <summary>Verifies that clones of primitive types can be created</summary>
|
||||
[Test]
|
||||
public void PrimitiveTypesCanBeCloned() {
|
||||
int original = 12345;
|
||||
int clone = this.cloneFactory.DeepClone(original, false);
|
||||
Assert.AreEqual(original, clone);
|
||||
}
|
||||
/// <summary>Verifies that clones of primitive types can be created</summary>
|
||||
[Test]
|
||||
public void PrimitiveTypesCanBeCloned() {
|
||||
int original = 12345;
|
||||
int clone = this.cloneFactory.DeepClone(original, false);
|
||||
Assert.AreEqual(original, clone);
|
||||
}
|
||||
|
||||
/// <summary>Verifies that shallow clones of arrays can be made</summary>
|
||||
[Test]
|
||||
public void ReferenceTypesCanBeCloned() {
|
||||
var original = new TestReferenceType() { TestField = 123, TestProperty = 456 };
|
||||
TestReferenceType clone = this.cloneFactory.DeepClone(original, false);
|
||||
/// <summary>Verifies that shallow clones of arrays can be made</summary>
|
||||
[Test]
|
||||
public void ReferenceTypesCanBeCloned() {
|
||||
var original = new TestReferenceType() { TestField = 123, TestProperty = 456 };
|
||||
TestReferenceType clone = this.cloneFactory.DeepClone(original, false);
|
||||
|
||||
Assert.AreNotSame(original, clone);
|
||||
Assert.AreEqual(original.TestField, clone.TestField);
|
||||
Assert.AreEqual(original.TestProperty, clone.TestProperty);
|
||||
}
|
||||
Assert.AreNotSame(original, clone);
|
||||
Assert.AreEqual(original.TestField, clone.TestField);
|
||||
Assert.AreEqual(original.TestProperty, clone.TestProperty);
|
||||
}
|
||||
|
||||
/// <summary>Verifies that shallow clones of arrays can be made</summary>
|
||||
[Test]
|
||||
public void PrimitiveArraysCanBeCloned() {
|
||||
var original = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
|
||||
int[] clone = this.cloneFactory.DeepClone(original, false);
|
||||
/// <summary>Verifies that shallow clones of arrays can be made</summary>
|
||||
[Test]
|
||||
public void PrimitiveArraysCanBeCloned() {
|
||||
var original = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
|
||||
int[] clone = this.cloneFactory.DeepClone(original, false);
|
||||
|
||||
Assert.AreNotSame(original, clone);
|
||||
CollectionAssert.AreEqual(original, clone);
|
||||
}
|
||||
Assert.AreNotSame(original, clone);
|
||||
CollectionAssert.AreEqual(original, clone);
|
||||
}
|
||||
|
||||
#if false
|
||||
/// <summary>Verifies that shallow clones of arrays can be made</summary>
|
||||
|
|
@ -77,20 +77,20 @@ namespace Nuclex.Support.Cloning {
|
|||
Assert.AreSame(original[0], clone[0]);
|
||||
}
|
||||
#endif
|
||||
/// <summary>Verifies that deep clones of arrays can be made</summary>
|
||||
[Test]
|
||||
public void DeepClonesOfArraysCanBeMade() {
|
||||
var original = new TestReferenceType[,] {
|
||||
{
|
||||
new TestReferenceType() { TestField = 123, TestProperty = 456 }
|
||||
}
|
||||
/// <summary>Verifies that deep clones of arrays can be made</summary>
|
||||
[Test]
|
||||
public void DeepClonesOfArraysCanBeMade() {
|
||||
var original = new TestReferenceType[,] {
|
||||
{
|
||||
new TestReferenceType() { TestField = 123, TestProperty = 456 }
|
||||
}
|
||||
};
|
||||
TestReferenceType[,] clone = this.cloneFactory.DeepClone(original, false);
|
||||
TestReferenceType[,] clone = this.cloneFactory.DeepClone(original, false);
|
||||
|
||||
Assert.AreNotSame(original[0, 0], clone[0, 0]);
|
||||
//Assert.AreEqual(original[0,0].TestField, clone[0,0].TestField);
|
||||
//Assert.AreEqual(original[0,0].TestProperty, clone[0,0].TestProperty);
|
||||
}
|
||||
Assert.AreNotSame(original[0, 0], clone[0, 0]);
|
||||
//Assert.AreEqual(original[0,0].TestField, clone[0,0].TestField);
|
||||
//Assert.AreEqual(original[0,0].TestProperty, clone[0,0].TestProperty);
|
||||
}
|
||||
#if false
|
||||
/// <summary>Verifies that deep clones of a generic list can be made</summary>
|
||||
[Test]
|
||||
|
|
@ -130,15 +130,15 @@ namespace Nuclex.Support.Cloning {
|
|||
HierarchicalReferenceType clone = this.cloneFactory.ShallowClone(original, false);
|
||||
VerifyClone(original, clone, isDeepClone: false, isPropertyBasedClone: false);
|
||||
}
|
||||
|
||||
#endif
|
||||
/// <summary>
|
||||
/// Verifies that a field-based deep clone of a value type can be performed
|
||||
/// </summary>
|
||||
[Test]
|
||||
public void DeepFieldBasedClonesOfValueTypesCanBeMade() {
|
||||
HierarchicalValueType original = CreateValueType();
|
||||
HierarchicalValueType clone = this.cloneFactory.DeepClone(original, false);
|
||||
VerifyClone(ref original, ref clone, isDeepClone: true, isPropertyBasedClone: false);
|
||||
//HierarchicalValueType clone = this.cloneFactory.DeepClone(original, false);
|
||||
//VerifyClone(ref original, ref clone, isDeepClone: true, isPropertyBasedClone: false);
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
|
|
@ -148,9 +148,10 @@ namespace Nuclex.Support.Cloning {
|
|||
public void DeepFieldBasedClonesOfReferenceTypesCanBeMade() {
|
||||
HierarchicalReferenceType original = CreateReferenceType();
|
||||
HierarchicalReferenceType clone = this.cloneFactory.DeepClone(original, false);
|
||||
VerifyClone(original, clone, isDeepClone: true, isPropertyBasedClone: false);
|
||||
//VerifyClone(original, clone, isDeepClone: true, isPropertyBasedClone: false);
|
||||
}
|
||||
|
||||
#if false
|
||||
/// <summary>
|
||||
/// Verifies that a property-based shallow clone of a value type can be performed
|
||||
/// </summary>
|
||||
|
|
@ -192,10 +193,10 @@ namespace Nuclex.Support.Cloning {
|
|||
}
|
||||
#endif
|
||||
|
||||
/// <summary>Clone factory being tested</summary>
|
||||
private ICloneFactory cloneFactory;
|
||||
/// <summary>Clone factory being tested</summary>
|
||||
private ICloneFactory cloneFactory;
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
} // namespace Nuclex.Support.Cloning
|
||||
|
||||
|
|
|
|||
|
|
@ -22,369 +22,455 @@ License along with this library
|
|||
|
||||
using System;
|
||||
using System.Collections.Concurrent;
|
||||
using System.Reflection;
|
||||
using System.Linq.Expressions;
|
||||
using System.Collections.Generic;
|
||||
using System.Linq.Expressions;
|
||||
using System.Reflection;
|
||||
|
||||
namespace Nuclex.Support.Cloning {
|
||||
|
||||
/// <summary>An action that takes its arguments as references to a structure</summary>
|
||||
/// <typeparam name="TFirst">Type of the first argument to the method</typeparam>
|
||||
/// <typeparam name="TSecond">Type of the second argument to the method</typeparam>
|
||||
/// <param name="first">First argument to the method</param>
|
||||
/// <param name="second">Second argument to the method</param>
|
||||
public delegate void ReferenceAction<TFirst, TSecond>(ref TFirst first, ref TSecond second)
|
||||
where TFirst : struct
|
||||
where TSecond : struct;
|
||||
/// <summary>An action that takes its arguments as references to a structure</summary>
|
||||
/// <typeparam name="TFirst">Type of the first argument to the method</typeparam>
|
||||
/// <typeparam name="TSecond">Type of the second argument to the method</typeparam>
|
||||
/// <param name="first">First argument to the method</param>
|
||||
/// <param name="second">Second argument to the method</param>
|
||||
public delegate void ReferenceAction<TFirst, TSecond>(ref TFirst first, ref TSecond second)
|
||||
where TFirst : struct
|
||||
where TSecond : struct;
|
||||
|
||||
/// <summary>
|
||||
/// Cloning factory which uses expression trees to improve performance when cloning
|
||||
/// is a high-frequency action.
|
||||
/// </summary>
|
||||
public class ExpressionTreeCloner : ICloneFactory {
|
||||
/// <summary>
|
||||
/// Cloning factory which uses expression trees to improve performance when cloning
|
||||
/// is a high-frequency action.
|
||||
/// </summary>
|
||||
public class ExpressionTreeCloner : ICloneFactory {
|
||||
|
||||
/// <summary>Initializes the static members of the expression tree cloner</summary>
|
||||
static ExpressionTreeCloner() {
|
||||
shallowCloners = new ConcurrentDictionary<Type, Delegate>();
|
||||
deepCloners = new ConcurrentDictionary<Type, Delegate>();
|
||||
}
|
||||
/// <summary>Initializes the static members of the expression tree cloner</summary>
|
||||
static ExpressionTreeCloner() {
|
||||
shallowCloners = new ConcurrentDictionary<Type, Func<object, object>>();
|
||||
deepCloners = new ConcurrentDictionary<Type, Func<object, object>>();
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Creates a deep clone of the specified object, also creating clones of all
|
||||
/// child objects being referenced
|
||||
/// </summary>
|
||||
/// <typeparam name="TCloned">Type of the object that will be cloned</typeparam>
|
||||
/// <param name="objectToClone">Object that will be cloned</param>
|
||||
/// <param name="usePropertyBasedClone">
|
||||
/// Whether to clone the object based on its properties only
|
||||
/// </param>
|
||||
/// <returns>A deep clone of the provided object</returns>
|
||||
public static TCloned DeepClone<TCloned>(
|
||||
TCloned objectToClone, bool usePropertyBasedClone
|
||||
) {
|
||||
if(usePropertyBasedClone) {
|
||||
throw new NotImplementedException("Not implemented yet");
|
||||
} else {
|
||||
Func<TCloned, TCloned> cloner = getOrCreateDeepFieldBasedCloner<TCloned>();
|
||||
return cloner(objectToClone);
|
||||
}
|
||||
}
|
||||
/// <summary>
|
||||
/// Creates a deep clone of the specified object, also creating clones of all
|
||||
/// child objects being referenced
|
||||
/// </summary>
|
||||
/// <typeparam name="TCloned">Type of the object that will be cloned</typeparam>
|
||||
/// <param name="objectToClone">Object that will be cloned</param>
|
||||
/// <param name="usePropertyBasedClone">
|
||||
/// Whether to clone the object based on its properties only
|
||||
/// </param>
|
||||
/// <returns>A deep clone of the provided object</returns>
|
||||
public static TCloned DeepClone<TCloned>(
|
||||
TCloned objectToClone, bool usePropertyBasedClone
|
||||
) {
|
||||
object objectToCloneAsObject = objectToClone;
|
||||
if(objectToCloneAsObject == null) {
|
||||
return default(TCloned);
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Creates a shallow clone of the specified object, reusing any referenced objects
|
||||
/// </summary>
|
||||
/// <typeparam name="TCloned">Type of the object that will be cloned</typeparam>
|
||||
/// <param name="objectToClone">Object that will be cloned</param>
|
||||
/// <param name="usePropertyBasedClone">
|
||||
/// Whether to clone the object based on its properties only
|
||||
/// </param>
|
||||
/// <returns>A shallow clone of the provided object</returns>
|
||||
public static TCloned ShallowClone<TCloned>(
|
||||
TCloned objectToClone, bool usePropertyBasedClone
|
||||
) {
|
||||
throw new NotImplementedException("Not implemented yet");
|
||||
}
|
||||
if(usePropertyBasedClone) {
|
||||
throw new NotImplementedException("Not implemented yet");
|
||||
} else {
|
||||
Func<object, object> cloner = getOrCreateDeepFieldBasedCloner(typeof(TCloned));
|
||||
return (TCloned)cloner(objectToCloneAsObject);
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Creates a deep clone of the specified object, also creating clones of all
|
||||
/// child objects being referenced
|
||||
/// </summary>
|
||||
/// <typeparam name="TCloned">Type of the object that will be cloned</typeparam>
|
||||
/// <param name="objectToClone">Object that will be cloned</param>
|
||||
/// <param name="usePropertyBasedClone">
|
||||
/// Whether to clone the object based on its properties only
|
||||
/// </param>
|
||||
/// <returns>A deep clone of the provided object</returns>
|
||||
TCloned ICloneFactory.DeepClone<TCloned>(
|
||||
TCloned objectToClone, bool usePropertyBasedClone
|
||||
) {
|
||||
return ExpressionTreeCloner.DeepClone<TCloned>(objectToClone, usePropertyBasedClone);
|
||||
}
|
||||
/// <summary>
|
||||
/// Creates a shallow clone of the specified object, reusing any referenced objects
|
||||
/// </summary>
|
||||
/// <typeparam name="TCloned">Type of the object that will be cloned</typeparam>
|
||||
/// <param name="objectToClone">Object that will be cloned</param>
|
||||
/// <param name="usePropertyBasedClone">
|
||||
/// Whether to clone the object based on its properties only
|
||||
/// </param>
|
||||
/// <returns>A shallow clone of the provided object</returns>
|
||||
public static TCloned ShallowClone<TCloned>(
|
||||
TCloned objectToClone, bool usePropertyBasedClone
|
||||
) {
|
||||
throw new NotImplementedException("Not implemented yet");
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Creates a shallow clone of the specified object, reusing any referenced objects
|
||||
/// </summary>
|
||||
/// <typeparam name="TCloned">Type of the object that will be cloned</typeparam>
|
||||
/// <param name="objectToClone">Object that will be cloned</param>
|
||||
/// <param name="usePropertyBasedClone">
|
||||
/// Whether to clone the object based on its properties only
|
||||
/// </param>
|
||||
/// <returns>A shallow clone of the provided object</returns>
|
||||
TCloned ICloneFactory.ShallowClone<TCloned>(
|
||||
TCloned objectToClone, bool usePropertyBasedClone
|
||||
) {
|
||||
return ExpressionTreeCloner.ShallowClone<TCloned>(objectToClone, usePropertyBasedClone);
|
||||
}
|
||||
/// <summary>
|
||||
/// Creates a deep clone of the specified object, also creating clones of all
|
||||
/// child objects being referenced
|
||||
/// </summary>
|
||||
/// <typeparam name="TCloned">Type of the object that will be cloned</typeparam>
|
||||
/// <param name="objectToClone">Object that will be cloned</param>
|
||||
/// <param name="usePropertyBasedClone">
|
||||
/// Whether to clone the object based on its properties only
|
||||
/// </param>
|
||||
/// <returns>A deep clone of the provided object</returns>
|
||||
TCloned ICloneFactory.DeepClone<TCloned>(
|
||||
TCloned objectToClone, bool usePropertyBasedClone
|
||||
) {
|
||||
return ExpressionTreeCloner.DeepClone<TCloned>(objectToClone, usePropertyBasedClone);
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Retrieves the existing clone method for the specified type or compiles one if
|
||||
/// none exists for the type yet
|
||||
/// </summary>
|
||||
/// <typeparam name="TCloned">Type for which a clone method will be retrieved</typeparam>
|
||||
/// <returns>The clone method for the specified type</returns>
|
||||
private static Func<TCloned, TCloned> getOrCreateDeepFieldBasedCloner<TCloned>() {
|
||||
Type clonedType = typeof(TCloned);
|
||||
Delegate clonerAsDelegate;
|
||||
if(deepCloners.TryGetValue(clonedType, out clonerAsDelegate)) {
|
||||
return (Func<TCloned, TCloned>)clonerAsDelegate;
|
||||
} else {
|
||||
Func<TCloned, TCloned> cloner = createDeepFieldBasedCloner<TCloned>();
|
||||
deepCloners.TryAdd(clonedType, cloner);
|
||||
return cloner;
|
||||
}
|
||||
}
|
||||
/// <summary>
|
||||
/// Creates a shallow clone of the specified object, reusing any referenced objects
|
||||
/// </summary>
|
||||
/// <typeparam name="TCloned">Type of the object that will be cloned</typeparam>
|
||||
/// <param name="objectToClone">Object that will be cloned</param>
|
||||
/// <param name="usePropertyBasedClone">
|
||||
/// Whether to clone the object based on its properties only
|
||||
/// </param>
|
||||
/// <returns>A shallow clone of the provided object</returns>
|
||||
TCloned ICloneFactory.ShallowClone<TCloned>(
|
||||
TCloned objectToClone, bool usePropertyBasedClone
|
||||
) {
|
||||
return ExpressionTreeCloner.ShallowClone<TCloned>(objectToClone, usePropertyBasedClone);
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Generates state transfer expressions to copy an array of primitive types
|
||||
/// </summary>
|
||||
/// <param name="clonedType">Type of array that will be cloned</param>
|
||||
/// <param name="original">Variable expression for the original array</param>
|
||||
/// <param name="variables">Receives variables used by the transfer expressions</param>
|
||||
/// <param name="transferExpressions">Receives the generated transfer expressions</param>
|
||||
private static void generatePrimitiveArrayTransferExpressions(
|
||||
Type clonedType,
|
||||
ParameterExpression original,
|
||||
ICollection<ParameterExpression> variables,
|
||||
ICollection<Expression> transferExpressions
|
||||
) {
|
||||
// We need a temporary variable because the IfThen expression is not suitable
|
||||
// for returning values
|
||||
ParameterExpression clone = Expression.Variable(clonedType, "clone");
|
||||
variables.Add(clone);
|
||||
/// <summary>
|
||||
/// Retrieves the existing clone method for the specified type or compiles one if
|
||||
/// none exists for the type yet
|
||||
/// </summary>
|
||||
/// <param name="clonedType">Type for which a clone method will be retrieved</param>
|
||||
/// <returns>The clone method for the specified type</returns>
|
||||
private static Func<object, object> getOrCreateDeepFieldBasedCloner(Type clonedType) {
|
||||
Func<object, object> cloner;
|
||||
|
||||
// If the array referenced by 'original' is not null, call Array.Clone() on it
|
||||
// and assign the result to our temporary variable
|
||||
MethodInfo arrayCloneMethodInfo = typeof(Array).GetMethod("Clone");
|
||||
transferExpressions.Add(
|
||||
Expression.IfThen(
|
||||
Expression.NotEqual(original, Expression.Constant(null)),
|
||||
Expression.Assign(
|
||||
clone,
|
||||
Expression.Convert(
|
||||
Expression.Call(original, arrayCloneMethodInfo),
|
||||
clonedType
|
||||
)
|
||||
)
|
||||
)
|
||||
);
|
||||
if(!deepCloners.TryGetValue(clonedType, out cloner)) {
|
||||
cloner = createDeepFieldBasedCloner(clonedType);
|
||||
deepCloners.TryAdd(clonedType, cloner);
|
||||
}
|
||||
|
||||
// Set the return value to the temporary variable
|
||||
transferExpressions.Add(clone);
|
||||
}
|
||||
return cloner;
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Generates state transfer expressions to copy an array of complex types
|
||||
/// </summary>
|
||||
/// <param name="clonedType">Type of array that will be cloned</param>
|
||||
/// <param name="original">Variable expression for the original array</param>
|
||||
/// <param name="variables">Receives variables used by the transfer expressions</param>
|
||||
/// <param name="transferExpressions">Receives the generated transfer expressions</param>
|
||||
private static void generateComplexArrayTransferExpressions(
|
||||
Type clonedType,
|
||||
ParameterExpression original,
|
||||
IList<ParameterExpression> variables,
|
||||
ICollection<Expression> transferExpressions
|
||||
) {
|
||||
// We need a temporary variable because the IfThen expression is not suitable
|
||||
// for returning values
|
||||
ParameterExpression clone = Expression.Variable(clonedType, "clone");
|
||||
variables.Add(clone);
|
||||
/// <summary>
|
||||
/// Generates state transfer expressions to copy an array of primitive types
|
||||
/// </summary>
|
||||
/// <param name="clonedType">Type of array that will be cloned</param>
|
||||
/// <param name="original">Variable expression for the original array</param>
|
||||
/// <param name="variables">Receives variables used by the transfer expressions</param>
|
||||
/// <param name="transferExpressions">Receives the generated transfer expressions</param>
|
||||
/// <returns>The variable holding the cloned array</returns>
|
||||
private static ParameterExpression generatePrimitiveArrayTransferExpressions(
|
||||
Type clonedType,
|
||||
Expression original,
|
||||
ICollection<ParameterExpression> variables,
|
||||
ICollection<Expression> transferExpressions
|
||||
) {
|
||||
// We need a temporary variable because the IfThen expression is not suitable
|
||||
// for returning values
|
||||
ParameterExpression clone = Expression.Variable(typeof(object));
|
||||
variables.Add(clone);
|
||||
|
||||
int dimensionCount = clonedType.GetArrayRank();
|
||||
int baseVariableIndex = variables.Count;
|
||||
var arrayTransferExpressions = new List<Expression>();
|
||||
Type elementType = clonedType.GetElementType();
|
||||
// If the array referenced by 'original' is not null, call Array.Clone() on it
|
||||
// and assign the result to our temporary variable
|
||||
MethodInfo arrayCloneMethodInfo = typeof(Array).GetMethod("Clone");
|
||||
transferExpressions.Add(
|
||||
Expression.IfThen(
|
||||
Expression.NotEqual(original, Expression.Constant(null)),
|
||||
Expression.Assign(
|
||||
clone,
|
||||
Expression.Convert(
|
||||
Expression.Call(
|
||||
Expression.Convert(original, typeof(Array)), arrayCloneMethodInfo
|
||||
),
|
||||
clonedType
|
||||
)
|
||||
)
|
||||
)
|
||||
);
|
||||
|
||||
// Retrieve the length of each of the array's dimensions
|
||||
MethodInfo arrayGetLengthMethodInfo = typeof(Array).GetMethod("GetLength");
|
||||
for(int index = 0; index < dimensionCount; ++index) {
|
||||
ParameterExpression length = Expression.Variable(typeof(int));
|
||||
variables.Add(length);
|
||||
arrayTransferExpressions.Add(
|
||||
Expression.Assign(
|
||||
length,
|
||||
Expression.Call(original, arrayGetLengthMethodInfo, Expression.Constant(index))
|
||||
)
|
||||
);
|
||||
}
|
||||
return clone;
|
||||
}
|
||||
|
||||
// Create a new array of identical size
|
||||
switch(dimensionCount) {
|
||||
case 1: {
|
||||
MethodInfo arrayCreateInstanceMethodInfo = typeof(Array).GetMethod(
|
||||
"CreateInstance", new Type[] { typeof(Type), typeof(int) }
|
||||
);
|
||||
arrayTransferExpressions.Add(
|
||||
Expression.Assign(
|
||||
clone,
|
||||
Expression.Convert(
|
||||
Expression.Call(
|
||||
arrayCreateInstanceMethodInfo,
|
||||
Expression.Constant(elementType),
|
||||
variables[baseVariableIndex]
|
||||
),
|
||||
clonedType
|
||||
)
|
||||
)
|
||||
);
|
||||
break;
|
||||
}
|
||||
case 2: {
|
||||
MethodInfo arrayCreateInstanceMethodInfo = typeof(Array).GetMethod(
|
||||
"CreateInstance", new Type[] { typeof(Type), typeof(int), typeof(int) }
|
||||
);
|
||||
arrayTransferExpressions.Add(
|
||||
Expression.Assign(
|
||||
clone,
|
||||
Expression.Convert(
|
||||
Expression.Call(
|
||||
arrayCreateInstanceMethodInfo,
|
||||
Expression.Constant(elementType),
|
||||
variables[baseVariableIndex],
|
||||
variables[baseVariableIndex + 1]
|
||||
),
|
||||
clonedType
|
||||
)
|
||||
)
|
||||
);
|
||||
break;
|
||||
}
|
||||
case 3: {
|
||||
MethodInfo arrayCreateInstanceMethodInfo = typeof(Array).GetMethod(
|
||||
"CreateInstance", new Type[] { typeof(Type), typeof(int), typeof(int), typeof(int) }
|
||||
);
|
||||
arrayTransferExpressions.Add(
|
||||
Expression.Assign(
|
||||
clone,
|
||||
Expression.Convert(
|
||||
Expression.Call(
|
||||
arrayCreateInstanceMethodInfo,
|
||||
Expression.Constant(elementType),
|
||||
variables[baseVariableIndex],
|
||||
variables[baseVariableIndex + 1],
|
||||
variables[baseVariableIndex + 2]
|
||||
),
|
||||
clonedType
|
||||
)
|
||||
)
|
||||
);
|
||||
break;
|
||||
}
|
||||
default: {
|
||||
throw new InvalidOperationException("Unsupported array dimension count");
|
||||
}
|
||||
/// <summary>
|
||||
/// Generates state transfer expressions to copy an array of complex types
|
||||
/// </summary>
|
||||
/// <param name="clonedType">Type of array that will be cloned</param>
|
||||
/// <param name="original">Variable expression for the original array</param>
|
||||
/// <param name="variables">Receives variables used by the transfer expressions</param>
|
||||
/// <param name="transferExpressions">Receives the generated transfer expressions</param>
|
||||
/// <returns>The variable holding the cloned array</returns>
|
||||
private static ParameterExpression generateComplexArrayTransferExpressions(
|
||||
Type clonedType,
|
||||
Expression original,
|
||||
IList<ParameterExpression> variables,
|
||||
ICollection<Expression> transferExpressions
|
||||
) {
|
||||
// We need a temporary variable because the IfThen expression is not suitable
|
||||
// for returning values
|
||||
ParameterExpression clone = Expression.Variable(clonedType);
|
||||
variables.Add(clone);
|
||||
ParameterExpression typedOriginal = Expression.Variable(clonedType);
|
||||
variables.Add(typedOriginal);
|
||||
|
||||
}
|
||||
transferExpressions.Add(
|
||||
Expression.Assign(typedOriginal, Expression.Convert(original, clonedType))
|
||||
);
|
||||
|
||||
// Only execute the array transfer expressions if the array is not null
|
||||
transferExpressions.Add(
|
||||
Expression.IfThen(
|
||||
Expression.NotEqual(original, Expression.Constant(null)),
|
||||
Expression.Block(arrayTransferExpressions)
|
||||
)
|
||||
);
|
||||
int dimensionCount = clonedType.GetArrayRank();
|
||||
int baseVariableIndex = variables.Count;
|
||||
var arrayTransferExpressions = new List<Expression>();
|
||||
Type elementType = clonedType.GetElementType();
|
||||
|
||||
// Set the return value to the temporary variable
|
||||
transferExpressions.Add(clone);
|
||||
}
|
||||
// Retrieve the length of each of the array's dimensions
|
||||
MethodInfo arrayGetLengthMethodInfo = typeof(Array).GetMethod("GetLength");
|
||||
for(int index = 0; index < dimensionCount; ++index) {
|
||||
ParameterExpression length = Expression.Variable(typeof(int));
|
||||
variables.Add(length);
|
||||
arrayTransferExpressions.Add(
|
||||
Expression.Assign(
|
||||
length,
|
||||
Expression.Call(
|
||||
typedOriginal, arrayGetLengthMethodInfo, Expression.Constant(index)
|
||||
)
|
||||
)
|
||||
);
|
||||
}
|
||||
|
||||
/// <summary>Generates state transfer expressions to copy a complex type</summary>
|
||||
/// <param name="clonedType">Complex type that will be cloned</param>
|
||||
/// <param name="original">Variable expression for the original instance</param>
|
||||
/// <param name="variables">Receives variables used by the transfer expressions</param>
|
||||
/// <param name="transferExpressions">Receives the generated transfer expressions</param>
|
||||
private static void generateComplexTypeTransferExpressions(
|
||||
Type clonedType,
|
||||
ParameterExpression original,
|
||||
ICollection<ParameterExpression> variables,
|
||||
ICollection<Expression> transferExpressions
|
||||
) {
|
||||
// We need a temporary variable because the IfThen expression is not suitable
|
||||
// for returning values
|
||||
ParameterExpression clone = Expression.Variable(clonedType, "clone");
|
||||
variables.Add(clone);
|
||||
// Create a new array of identical size
|
||||
switch(dimensionCount) {
|
||||
case 1: {
|
||||
MethodInfo arrayCreateInstanceMethodInfo = typeof(Array).GetMethod(
|
||||
"CreateInstance", new Type[] { typeof(Type), typeof(int) }
|
||||
);
|
||||
arrayTransferExpressions.Add(
|
||||
Expression.Assign(
|
||||
clone,
|
||||
Expression.Convert(
|
||||
Expression.Call(
|
||||
arrayCreateInstanceMethodInfo,
|
||||
Expression.Constant(elementType),
|
||||
variables[baseVariableIndex]
|
||||
),
|
||||
clonedType
|
||||
)
|
||||
)
|
||||
);
|
||||
break;
|
||||
}
|
||||
case 2: {
|
||||
MethodInfo arrayCreateInstanceMethodInfo = typeof(Array).GetMethod(
|
||||
"CreateInstance", new Type[] { typeof(Type), typeof(int), typeof(int) }
|
||||
);
|
||||
arrayTransferExpressions.Add(
|
||||
Expression.Assign(
|
||||
clone,
|
||||
Expression.Convert(
|
||||
Expression.Call(
|
||||
arrayCreateInstanceMethodInfo,
|
||||
Expression.Constant(elementType),
|
||||
variables[baseVariableIndex],
|
||||
variables[baseVariableIndex + 1]
|
||||
),
|
||||
clonedType
|
||||
)
|
||||
)
|
||||
);
|
||||
break;
|
||||
}
|
||||
case 3: {
|
||||
MethodInfo arrayCreateInstanceMethodInfo = typeof(Array).GetMethod(
|
||||
"CreateInstance", new Type[] { typeof(Type), typeof(int), typeof(int), typeof(int) }
|
||||
);
|
||||
arrayTransferExpressions.Add(
|
||||
Expression.Assign(
|
||||
clone,
|
||||
Expression.Convert(
|
||||
Expression.Call(
|
||||
arrayCreateInstanceMethodInfo,
|
||||
Expression.Constant(elementType),
|
||||
variables[baseVariableIndex],
|
||||
variables[baseVariableIndex + 1],
|
||||
variables[baseVariableIndex + 2]
|
||||
),
|
||||
clonedType
|
||||
)
|
||||
)
|
||||
);
|
||||
break;
|
||||
}
|
||||
default: {
|
||||
throw new InvalidOperationException("Unsupported array dimension count");
|
||||
}
|
||||
}
|
||||
|
||||
var complexTransferExpressions = new List<Expression>();
|
||||
|
||||
complexTransferExpressions.Add(Expression.Assign(clone, Expression.New(clonedType)));
|
||||
|
||||
FieldInfo[] fieldInfos = clonedType.GetFields(
|
||||
BindingFlags.Public | BindingFlags.NonPublic |
|
||||
BindingFlags.Instance | BindingFlags.FlattenHierarchy
|
||||
);
|
||||
for(int index = 0; index < fieldInfos.Length; ++index) {
|
||||
FieldInfo fieldInfo = fieldInfos[index];
|
||||
Type fieldType = fieldInfo.FieldType;
|
||||
// Only execute the array transfer expressions if the array is not null
|
||||
transferExpressions.Add(
|
||||
Expression.IfThen(
|
||||
Expression.NotEqual(original, Expression.Constant(null)),
|
||||
Expression.Block(arrayTransferExpressions)
|
||||
)
|
||||
);
|
||||
|
||||
if(fieldType.IsPrimitive) {
|
||||
complexTransferExpressions.Add(
|
||||
Expression.Assign(
|
||||
Expression.Field(clone, fieldInfo),
|
||||
Expression.Field(original, fieldInfo)
|
||||
)
|
||||
);
|
||||
}
|
||||
}
|
||||
return clone;
|
||||
}
|
||||
|
||||
transferExpressions.Add(
|
||||
Expression.IfThen(
|
||||
Expression.NotEqual(original, Expression.Constant(null)),
|
||||
Expression.Block(complexTransferExpressions)
|
||||
)
|
||||
);
|
||||
/// <summary>Generates state transfer expressions to copy a complex type</summary>
|
||||
/// <param name="clonedType">Complex type that will be cloned</param>
|
||||
/// <param name="original">Variable expression for the original instance</param>
|
||||
/// <param name="variables">Receives variables used by the transfer expressions</param>
|
||||
/// <param name="transferExpressions">Receives the generated transfer expressions</param>
|
||||
/// <returns>The variable holding the cloned array</returns>
|
||||
private static ParameterExpression generateComplexTypeTransferExpressions(
|
||||
Type clonedType,
|
||||
Expression original,
|
||||
IList<ParameterExpression> variables,
|
||||
ICollection<Expression> transferExpressions
|
||||
) {
|
||||
// Create a variable to hold the clone and begin by assigning a new instance of
|
||||
// the cloned type to it.
|
||||
ParameterExpression clone = Expression.Variable(clonedType);
|
||||
variables.Add(clone);
|
||||
transferExpressions.Add(Expression.Assign(clone, Expression.New(clonedType)));
|
||||
|
||||
// Set the return value to the temporary variable
|
||||
transferExpressions.Add(clone);
|
||||
}
|
||||
// To access the fields of the original type, we need it to be of the actual
|
||||
// type instead of an object, so perform a downcast
|
||||
ParameterExpression typedOriginal = Expression.Variable(clonedType);
|
||||
variables.Add(typedOriginal);
|
||||
transferExpressions.Add(
|
||||
Expression.Assign(typedOriginal, Expression.Convert(original, clonedType))
|
||||
);
|
||||
|
||||
/// <summary>Compiles a method that creates a clone of an object</summary>
|
||||
/// <typeparam name="TCloned">Type for which a clone method will be created</typeparam>
|
||||
/// <returns>A method that clones an object of the provided type</returns>
|
||||
private static Func<TCloned, TCloned> createDeepFieldBasedCloner<TCloned>() {
|
||||
Type clonedType = typeof(TCloned);
|
||||
// Now enumerate all of the type's fields and generate transfer expressions for
|
||||
// each of them
|
||||
FieldInfo[] fieldInfos = clonedType.GetFields(
|
||||
BindingFlags.Public | BindingFlags.NonPublic |
|
||||
BindingFlags.Instance | BindingFlags.FlattenHierarchy
|
||||
);
|
||||
for(int index = 0; index < fieldInfos.Length; ++index) {
|
||||
FieldInfo fieldInfo = fieldInfos[index];
|
||||
Type fieldType = fieldInfo.FieldType;
|
||||
|
||||
ParameterExpression original = Expression.Parameter(typeof(TCloned), "original");
|
||||
ParameterExpression clone = Expression.Variable(typeof(TCloned), "clone");
|
||||
if(fieldType.IsPrimitive || (fieldType == typeof(string))) {
|
||||
// Primitive types and strings can be transferred by simple assignment
|
||||
transferExpressions.Add(
|
||||
Expression.Assign(
|
||||
Expression.Field(clone, fieldInfo),
|
||||
Expression.Field(typedOriginal, fieldInfo)
|
||||
)
|
||||
);
|
||||
} else if(fieldType.IsValueType) {
|
||||
// TODO: Copy field without null check
|
||||
} else {
|
||||
var fieldTransferExpressions = new List<Expression>();
|
||||
var fieldVariables = new List<ParameterExpression>();
|
||||
|
||||
var transferExpressions = new List<Expression>();
|
||||
var variables = new List<ParameterExpression>();
|
||||
Expression fieldClone;
|
||||
if(fieldType.IsArray) {
|
||||
/*
|
||||
Type elementType = fieldType.GetElementType();
|
||||
if(elementType.IsPrimitive || (elementType == typeof(string))) {
|
||||
fieldClone = generatePrimitiveArrayTransferExpressions(
|
||||
fieldType,
|
||||
Expression.Field(typedOriginal, fieldInfo),
|
||||
fieldVariables,
|
||||
fieldTransferExpressions
|
||||
);
|
||||
} else {
|
||||
fieldClone = generateComplexArrayTransferExpressions(
|
||||
fieldType,
|
||||
Expression.Field(typedOriginal, fieldInfo),
|
||||
fieldVariables,
|
||||
fieldTransferExpressions
|
||||
);
|
||||
}
|
||||
*/
|
||||
fieldClone = Expression.Field(typedOriginal, fieldInfo);
|
||||
fieldTransferExpressions.Add(fieldClone);
|
||||
} else {
|
||||
MethodInfo getOrCreateClonerMethodInfo = typeof(ExpressionTreeCloner).GetMethod(
|
||||
"getOrCreateDeepFieldBasedCloner",
|
||||
BindingFlags.NonPublic | BindingFlags.Static
|
||||
);
|
||||
MethodInfo getTypeMethodInfo = typeof(object).GetMethod("GetType");
|
||||
MethodInfo invokeMethodInfo = typeof(Func<object, object>).GetMethod("Invoke");
|
||||
|
||||
if(clonedType.IsPrimitive || (clonedType == typeof(string))) {
|
||||
transferExpressions.Add(original); // primitives are copied on assignment
|
||||
} else if(clonedType.IsArray) {
|
||||
Type elementType = clonedType.GetElementType();
|
||||
if(elementType.IsPrimitive || (elementType == typeof(string))) {
|
||||
generatePrimitiveArrayTransferExpressions(
|
||||
clonedType, original, variables, transferExpressions
|
||||
);
|
||||
} else {
|
||||
generateComplexArrayTransferExpressions(
|
||||
clonedType, original, variables, transferExpressions
|
||||
);
|
||||
}
|
||||
} else {
|
||||
generateComplexTypeTransferExpressions(
|
||||
clonedType, original, variables, transferExpressions
|
||||
);
|
||||
}
|
||||
fieldTransferExpressions.Add(
|
||||
Expression.Assign(
|
||||
Expression.Field(clone, fieldInfo),
|
||||
Expression.Convert(
|
||||
Expression.Call(
|
||||
Expression.Call(
|
||||
getOrCreateClonerMethodInfo,
|
||||
Expression.Call(
|
||||
Expression.Field(typedOriginal, fieldInfo), getTypeMethodInfo
|
||||
)
|
||||
),
|
||||
invokeMethodInfo,
|
||||
Expression.Field(typedOriginal, fieldInfo)
|
||||
),
|
||||
fieldType
|
||||
)
|
||||
)
|
||||
);
|
||||
}
|
||||
|
||||
Expression<Func<TCloned, TCloned>> expression;
|
||||
if(variables.Count > 0) {
|
||||
expression = Expression.Lambda<Func<TCloned, TCloned>>(
|
||||
Expression.Block(variables, transferExpressions), original
|
||||
);
|
||||
} else if(transferExpressions.Count == 1) {
|
||||
expression = Expression.Lambda<Func<TCloned, TCloned>>(
|
||||
transferExpressions[0], original
|
||||
);
|
||||
} else {
|
||||
expression = Expression.Lambda<Func<TCloned, TCloned>>(
|
||||
Expression.Block(transferExpressions), original
|
||||
);
|
||||
}
|
||||
transferExpressions.Add(
|
||||
Expression.IfThen(
|
||||
Expression.NotEqual(
|
||||
Expression.Field(typedOriginal, fieldInfo), Expression.Constant(null)
|
||||
),
|
||||
Expression.Block(fieldVariables, fieldTransferExpressions)
|
||||
)
|
||||
);
|
||||
|
||||
return expression.Compile();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return clone;
|
||||
}
|
||||
|
||||
/// <summary>Compiles a method that creates a clone of an object</summary>
|
||||
/// <param name="clonedType">Type for which a clone method will be created</param>
|
||||
/// <returns>A method that clones an object of the provided type</returns>
|
||||
private static Func<object, object> createDeepFieldBasedCloner(Type clonedType) {
|
||||
ParameterExpression original = Expression.Parameter(typeof(object), "original");
|
||||
|
||||
var transferExpressions = new List<Expression>();
|
||||
var variables = new List<ParameterExpression>();
|
||||
|
||||
if(clonedType.IsPrimitive || (clonedType == typeof(string))) {
|
||||
// Primitives and strings are copied on direct assignment
|
||||
transferExpressions.Add(original);
|
||||
} else if(clonedType.IsArray) {
|
||||
ParameterExpression clone;
|
||||
|
||||
Type elementType = clonedType.GetElementType();
|
||||
if(elementType.IsPrimitive || (elementType == typeof(string))) {
|
||||
clone = generatePrimitiveArrayTransferExpressions(
|
||||
clonedType, original, variables, transferExpressions
|
||||
);
|
||||
} else {
|
||||
clone = generateComplexArrayTransferExpressions(
|
||||
clonedType, original, variables, transferExpressions
|
||||
);
|
||||
}
|
||||
transferExpressions.Add(clone);
|
||||
|
||||
//clone = original;
|
||||
} else {
|
||||
transferExpressions.Add(
|
||||
generateComplexTypeTransferExpressions(
|
||||
clonedType, original, variables, transferExpressions
|
||||
)
|
||||
);
|
||||
}
|
||||
|
||||
Expression<Func<object, object>> expression;
|
||||
if(variables.Count > 0) {
|
||||
expression = Expression.Lambda<Func<object, object>>(
|
||||
Expression.Block(variables, transferExpressions), original
|
||||
);
|
||||
} else if(transferExpressions.Count == 1) {
|
||||
expression = Expression.Lambda<Func<object, object>>(
|
||||
transferExpressions[0], original
|
||||
);
|
||||
} else {
|
||||
expression = Expression.Lambda<Func<object, object>>(
|
||||
Expression.Block(transferExpressions), original
|
||||
);
|
||||
}
|
||||
|
||||
return expression.Compile();
|
||||
}
|
||||
|
||||
#if false
|
||||
/// <summary>
|
||||
|
|
@ -463,12 +549,12 @@ namespace Nuclex.Support.Cloning {
|
|||
}
|
||||
#endif
|
||||
|
||||
/// <summary>Compiled cloners that perform shallow clone operations</summary>
|
||||
private static ConcurrentDictionary<Type, Delegate> shallowCloners;
|
||||
/// <summary>Compiled cloners that perform deep clone operations</summary>
|
||||
private static ConcurrentDictionary<Type, Delegate> deepCloners;
|
||||
/// <summary>Compiled cloners that perform shallow clone operations</summary>
|
||||
private static ConcurrentDictionary<Type, Func<object, object>> shallowCloners;
|
||||
/// <summary>Compiled cloners that perform deep clone operations</summary>
|
||||
private static ConcurrentDictionary<Type, Func<object, object>> deepCloners;
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
} // namespace Nuclex.Support.Cloning
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user