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ClassFactory.cs
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ClassFactory.cs
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using System;
using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;
using System.Threading;
namespace System.Linq.Dynamic
{
internal class ClassFactory
{
public static readonly ClassFactory Instance;
private ModuleBuilder module;
private Dictionary<Signature, Type> classes;
private int classCount;
private System.Threading.ReaderWriterLockSlim rwLock;
static ClassFactory()
{
ClassFactory.Instance = new ClassFactory();
}
private ClassFactory()
{
AssemblyName name = new AssemblyName("DynamicClasses");
AssemblyBuilder assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(new AssemblyName(Guid.NewGuid().ToString()),AssemblyBuilderAccess.Run);
this.module = assemblyBuilder.DefineDynamicModule("Module");
this.classes = new Dictionary<Signature, Type>();
this.rwLock = new ReaderWriterLockSlim();
}
public Type GetDynamicClass(IEnumerable<DynamicProperty> properties)
{
//this.rwLock.AcquireReaderLock(-1);
this.rwLock.EnterUpgradeableReadLock();
Type result;
try
{
Signature signature = new Signature(properties);
Type type;
if (!this.classes.TryGetValue(signature, out type))
{
type = this.CreateDynamicClass(signature.properties);
this.classes.Add(signature, type);
}
result = type;
}
finally
{
//this.rwLock.ReleaseReaderLock();
this.rwLock.ExitUpgradeableReadLock();
}
return result;
}
private Type CreateDynamicClass(DynamicProperty[] properties)
{
this.rwLock.EnterWriteLock();
Type result;
try
{
string name = "DynamicClass" + (this.classCount + 1);
TypeBuilder typeBuilder = this.module.DefineType(name, TypeAttributes.Public, typeof(DynamicClass));
FieldInfo[] fields = this.GenerateProperties(typeBuilder, properties);
this.GenerateEquals(typeBuilder, fields);
this.GenerateGetHashCode(typeBuilder, fields);
Type type = typeBuilder.AsType();
this.classCount++;
result = type;
}
finally
{
this.rwLock.ExitWriteLock();
}
return result;
}
private FieldInfo[] GenerateProperties(TypeBuilder tb, DynamicProperty[] properties)
{
FieldInfo[] array = new FieldBuilder[properties.Length];
for (int i = 0; i < properties.Length; i++)
{
DynamicProperty dynamicProperty = properties[i];
FieldBuilder fieldBuilder = tb.DefineField("_" + dynamicProperty.Name, dynamicProperty.Type, FieldAttributes.Private);
PropertyBuilder propertyBuilder = tb.DefineProperty(dynamicProperty.Name, PropertyAttributes.HasDefault, dynamicProperty.Type, null);
MethodBuilder methodBuilder = tb.DefineMethod("get_" + dynamicProperty.Name, MethodAttributes.FamANDAssem | MethodAttributes.Family | MethodAttributes.HideBySig | MethodAttributes.SpecialName, dynamicProperty.Type, Type.EmptyTypes);
ILGenerator iLGenerator = methodBuilder.GetILGenerator();
iLGenerator.Emit(OpCodes.Ldarg_0);
iLGenerator.Emit(OpCodes.Ldfld, fieldBuilder);
iLGenerator.Emit(OpCodes.Ret);
MethodBuilder methodBuilder2 = tb.DefineMethod("set_" + dynamicProperty.Name, MethodAttributes.FamANDAssem | MethodAttributes.Family | MethodAttributes.HideBySig | MethodAttributes.SpecialName, null, new Type[]
{
dynamicProperty.Type
});
ILGenerator iLGenerator2 = methodBuilder2.GetILGenerator();
iLGenerator2.Emit(OpCodes.Ldarg_0);
iLGenerator2.Emit(OpCodes.Ldarg_1);
iLGenerator2.Emit(OpCodes.Stfld, fieldBuilder);
iLGenerator2.Emit(OpCodes.Ret);
propertyBuilder.SetGetMethod(methodBuilder);
propertyBuilder.SetSetMethod(methodBuilder2);
array[i] = fieldBuilder;
}
return array;
}
private void GenerateEquals(TypeBuilder tb, FieldInfo[] fields)
{
MethodBuilder methodBuilder = tb.DefineMethod("Equals", MethodAttributes.FamANDAssem | MethodAttributes.Family | MethodAttributes.Virtual | MethodAttributes.HideBySig, typeof(bool), new Type[]
{
typeof(object)
});
Type type = tb.AsType();
ILGenerator iLGenerator = methodBuilder.GetILGenerator();
LocalBuilder local = iLGenerator.DeclareLocal(type);
Label label = iLGenerator.DefineLabel();
iLGenerator.Emit(OpCodes.Ldarg_1);
iLGenerator.Emit(OpCodes.Isinst, type);
iLGenerator.Emit(OpCodes.Stloc, local);
iLGenerator.Emit(OpCodes.Ldloc, local);
iLGenerator.Emit(OpCodes.Brtrue_S, label);
iLGenerator.Emit(OpCodes.Ldc_I4_0);
iLGenerator.Emit(OpCodes.Ret);
iLGenerator.MarkLabel(label);
for (int i = 0; i < fields.Length; i++)
{
FieldInfo fieldInfo = fields[i];
Type fieldType = fieldInfo.FieldType;
Type genericType = typeof(EqualityComparer<>).MakeGenericType(new Type[]
{
fieldType
});
label = iLGenerator.DefineLabel();
iLGenerator.EmitCall(OpCodes.Call, genericType.GetRuntimeProperty("Default").GetMethod, null);
iLGenerator.Emit(OpCodes.Ldarg_0);
iLGenerator.Emit(OpCodes.Ldfld, fieldInfo);
iLGenerator.Emit(OpCodes.Ldloc, local);
iLGenerator.Emit(OpCodes.Ldfld, fieldInfo);
iLGenerator.EmitCall(OpCodes.Callvirt, genericType.GetRuntimeMethod("Equals", new Type[]
{
fieldType,
fieldType
}), null);
iLGenerator.Emit(OpCodes.Brtrue_S, label);
iLGenerator.Emit(OpCodes.Ldc_I4_0);
iLGenerator.Emit(OpCodes.Ret);
iLGenerator.MarkLabel(label);
}
iLGenerator.Emit(OpCodes.Ldc_I4_1);
iLGenerator.Emit(OpCodes.Ret);
}
private void GenerateGetHashCode(TypeBuilder tb, FieldInfo[] fields)
{
MethodBuilder methodBuilder = tb.DefineMethod("GetHashCode", MethodAttributes.FamANDAssem | MethodAttributes.Family | MethodAttributes.Virtual | MethodAttributes.HideBySig, typeof(int), Type.EmptyTypes);
ILGenerator iLGenerator = methodBuilder.GetILGenerator();
iLGenerator.Emit(OpCodes.Ldc_I4_0);
for (int i = 0; i < fields.Length; i++)
{
FieldInfo fieldInfo = fields[i];
Type fieldType = fieldInfo.FieldType;
Type type = typeof(EqualityComparer<>).MakeGenericType(new Type[]
{
fieldType
});
iLGenerator.EmitCall(OpCodes.Call, type.GetRuntimeProperty("Default").GetMethod, null);
iLGenerator.Emit(OpCodes.Ldarg_0);
iLGenerator.Emit(OpCodes.Ldfld, fieldInfo);
iLGenerator.EmitCall(OpCodes.Callvirt, type.GetRuntimeMethod("GetHashCode", new Type[]
{
fieldType
}), null);
iLGenerator.Emit(OpCodes.Xor);
}
iLGenerator.Emit(OpCodes.Ret);
}
}
}