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@ -1,5 +1,6 @@
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using System;
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using System;
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using System.Collections.Generic;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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using System.Reflection;
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using System.Reflection;
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namespace Marr.Data.Reflection
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namespace Marr.Data.Reflection
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@ -8,6 +9,8 @@ namespace Marr.Data.Reflection
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{
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{
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private static readonly Dictionary<string, MemberInfo> MemberCache = new Dictionary<string, MemberInfo>();
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private static readonly Dictionary<string, MemberInfo> MemberCache = new Dictionary<string, MemberInfo>();
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private static readonly Dictionary<string, GetterDelegate> GetterCache = new Dictionary<string, GetterDelegate>();
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private static readonly Dictionary<string, SetterDelegate> SetterCache = new Dictionary<string, SetterDelegate>();
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private static MemberInfo GetMember(Type entityType, string name)
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private static MemberInfo GetMember(Type entityType, string name)
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@ -24,80 +27,119 @@ namespace Marr.Data.Reflection
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}
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}
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/// <summary>
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/// <summary>
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/// Sets an entity field value by name to the passed in 'val'.
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/// Gets an entity field value by name.
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/// </summary>
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/// </summary>
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public void SetFieldValue<T>(T entity, string fieldName, object val)
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public object GetFieldValue(object entity, string fieldName)
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{
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{
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var member = GetMember(entity.GetType(), fieldName);
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var member = GetMember(entity.GetType(), fieldName);
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try
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{
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// Handle DB null values
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if (val == DBNull.Value)
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{
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if (member.MemberType == MemberTypes.Field)
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if (member.MemberType == MemberTypes.Field)
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{
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{
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(member as FieldInfo).SetValue(entity,
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return (member as FieldInfo).GetValue(entity);
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ReflectionHelper.GetDefaultValue((member as FieldInfo).FieldType));
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}
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}
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else if (member.MemberType == MemberTypes.Property)
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if (member.MemberType == MemberTypes.Property)
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{
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{
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var pi = (member as PropertyInfo);
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return BuildGetter(entity.GetType(), fieldName)(entity);
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if (pi.CanWrite)
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(member as PropertyInfo).SetValue(entity,
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ReflectionHelper.GetDefaultValue(
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(member as PropertyInfo).PropertyType), null);
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}
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}
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throw new DataMappingException(string.Format("The DataMapper could not get the value for {0}.{1}.", entity.GetType().Name, fieldName));
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}
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}
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else
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/// <summary>
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/// Instantiates a type using the FastReflector library for increased speed.
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/// </summary>
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/// <param name="type"></param>
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/// <returns></returns>
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public object CreateInstance(Type type)
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{
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{
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if (member.MemberType == MemberTypes.Field)
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return Activator.CreateInstance(type);
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(member as FieldInfo).SetValue(entity, val);
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}
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else if (member.MemberType == MemberTypes.Property)
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public GetterDelegate BuildGetter(Type type, string memberName)
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{
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{
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var pi = (member as PropertyInfo);
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GetterDelegate getter;
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if (pi.CanWrite)
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var key = type.FullName + memberName;
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(member as PropertyInfo).SetValue(entity, val, null);
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if (!GetterCache.TryGetValue(key, out getter))
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{
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getter = GetPropertyGetter((PropertyInfo)GetMember(type, memberName));
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}
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return getter;
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}
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}
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public SetterDelegate BuildSetter(Type type, string memberName)
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{
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SetterDelegate setter;
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var key = type.FullName + memberName;
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if (!SetterCache.TryGetValue(key, out setter))
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{
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setter = GetPropertySetter((PropertyInfo)GetMember(type, memberName));
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}
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}
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return setter;
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}
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}
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catch (Exception ex)
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private static SetterDelegate GetPropertySetter(PropertyInfo propertyInfo)
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{
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{
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string msg = string.Format("The DataMapper was unable to load the following field: {0}. \nDetails: {1}", fieldName, ex.Message);
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var propertySetMethod = propertyInfo.GetSetMethod();
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throw new DataMappingException(msg, ex);
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if (propertySetMethod == null) return null;
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}
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#if NO_EXPRESSIONS
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return (o, convertedValue) =>
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{
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propertySetMethod.Invoke(o, new[] { convertedValue });
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return;
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};
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#else
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var instance = Expression.Parameter(typeof(object), "i");
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var argument = Expression.Parameter(typeof(object), "a");
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var instanceParam = Expression.Convert(instance, propertyInfo.DeclaringType);
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var valueParam = Expression.Convert(argument, propertyInfo.PropertyType);
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var setterCall = Expression.Call(instanceParam, propertyInfo.GetSetMethod(), valueParam);
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return Expression.Lambda<SetterDelegate>(setterCall, instance, argument).Compile();
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#endif
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}
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}
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/// <summary>
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private static GetterDelegate GetPropertyGetter(PropertyInfo propertyInfo)
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/// Gets an entity field value by name.
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/// </summary>
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public object GetFieldValue(object entity, string fieldName)
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{
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{
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var member = GetMember(entity.GetType(), fieldName);
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if (member.MemberType == MemberTypes.Field)
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var getMethodInfo = propertyInfo.GetGetMethod();
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if (getMethodInfo == null) return null;
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#if NO_EXPRESSIONS
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return o => propertyInfo.GetGetMethod().Invoke(o, new object[] { });
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#else
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try
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{
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{
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return (member as FieldInfo).GetValue(entity);
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var oInstanceParam = Expression.Parameter(typeof(object), "oInstanceParam");
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var instanceParam = Expression.Convert(oInstanceParam, propertyInfo.DeclaringType);
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var exprCallPropertyGetFn = Expression.Call(instanceParam, getMethodInfo);
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var oExprCallPropertyGetFn = Expression.Convert(exprCallPropertyGetFn, typeof(object));
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var propertyGetFn = Expression.Lambda<GetterDelegate>
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(
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oExprCallPropertyGetFn,
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oInstanceParam
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).Compile();
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return propertyGetFn;
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}
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}
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if (member.MemberType == MemberTypes.Property)
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catch (Exception ex)
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{
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{
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if ((member as PropertyInfo).CanRead)
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Console.Write(ex.Message);
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return (member as PropertyInfo).GetValue(entity, null);
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throw;
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}
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}
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throw new DataMappingException(string.Format("The DataMapper could not get the value for {0}.{1}.", entity.GetType().Name, fieldName));
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#endif
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}
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}
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/// <summary>
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/// Instantiantes a type using the FastReflector library for increased speed.
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/// </summary>
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/// <param name="type"></param>
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/// <returns></returns>
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public object CreateInstance(Type type)
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{
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return Activator.CreateInstance(type);
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}
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}
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}
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}
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}
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kay.one
12 years ago