/// <summary>
/// Creates the constructor arguments used to create a type.
/// </summary>
/// <param name="map">The mapping to create the arguments for.</param>
/// <param name="argumentExpressions">The arguments that will be added to the mapping.</param>
protected virtual void CreateConstructorArgumentExpressionsForMapping(ClassMap map, List <Expression> argumentExpressions)
{
foreach (var parameterMap in map.ParameterMaps)
{
if (parameterMap.ConstructorTypeMap != null)
{
// Constructor paramter type.
var arguments = new List <Expression>();
CreateConstructorArgumentExpressionsForMapping(parameterMap.ConstructorTypeMap, arguments);
var constructorExpression = Expression.New(Reader.Configuration.GetConstructor(parameterMap.ConstructorTypeMap.ClassType), arguments);
argumentExpressions.Add(constructorExpression);
}
else if (parameterMap.ReferenceMap != null)
{
// Reference type.
var referenceBindings = new List <MemberBinding>();
ExpressionManager.CreateMemberBindingsForMapping(parameterMap.ReferenceMap.Data.Mapping, parameterMap.ReferenceMap.Data.Parameter.ParameterType, referenceBindings);
// This is in case an IContractResolver is being used.
var type = ReflectionHelper.CreateInstance(parameterMap.ReferenceMap.Data.Parameter.ParameterType).GetType();
var referenceBody = Expression.MemberInit(Expression.New(type), referenceBindings);
argumentExpressions.Add(referenceBody);
}
else
{
// Value type.
var index = Reader.Configuration.HasHeaderRecord
? Reader.GetFieldIndex(parameterMap.Data.Name, 0)
: parameterMap.Data.Index;
// Get the field using the field index.
var method = typeof(IReaderRow).GetProperty("Item", typeof(string), new[] { typeof(int) }).GetGetMethod();
Expression fieldExpression = Expression.Call(Expression.Constant(Reader), method, Expression.Constant(index, typeof(int)));
// Convert the field.
var typeConverterExpression = Expression.Constant(parameterMap.Data.TypeConverter);
parameterMap.Data.TypeConverterOptions = TypeConverterOptions.Merge(new TypeConverterOptions(), Reader.context.ReaderConfiguration.TypeConverterOptionsFactory.GetOptions(parameterMap.Data.Parameter.ParameterType), parameterMap.Data.TypeConverterOptions);
parameterMap.Data.TypeConverterOptions.CultureInfo = Reader.context.ReaderConfiguration.CultureInfo;
// Create type converter expression.
var memberMapData = new MemberMapData(null)
{
Index = parameterMap.Data.Index,
TypeConverter = parameterMap.Data.TypeConverter,
TypeConverterOptions = parameterMap.Data.TypeConverterOptions
};
memberMapData.Names.Add(parameterMap.Data.Name);
Expression typeConverterFieldExpression = Expression.Call(typeConverterExpression, nameof(ITypeConverter.ConvertFromString), null, fieldExpression, Expression.Constant(Reader), Expression.Constant(memberMapData));
typeConverterFieldExpression = Expression.Convert(typeConverterFieldExpression, parameterMap.Data.Parameter.ParameterType);
fieldExpression = typeConverterFieldExpression;
argumentExpressions.Add(fieldExpression);
}
}
}
/// <summary>
/// Creates a <see cref="Delegate"/> of type <see cref="Func{T}"/>
/// that will create a record of the given type using the current
/// reader row.
/// </summary>
/// <param name="recordType">The record type.</param>
protected override Delegate CreateCreateRecordDelegate(Type recordType)
{
if (Reader.context.ReaderConfiguration.Maps[recordType] == null)
{
Reader.context.ReaderConfiguration.Maps.Add(Reader.context.ReaderConfiguration.AutoMap(recordType));
}
var map = Reader.context.ReaderConfiguration.Maps[recordType];
Expression body;
if (map.ParameterMaps.Count > 0)
{
// This is a constructor paramter type.
var arguments = new List <Expression>();
CreateConstructorArgumentExpressionsForMapping(map, arguments);
body = Expression.New(Reader.Configuration.GetConstructor(map.ClassType), arguments);
}
else
{
var bindings = new List <MemberBinding>();
ExpressionManager.CreateMemberBindingsForMapping(map, recordType, bindings);
if (bindings.Count == 0)
{
throw new ReaderException(Reader.context, $"No members are mapped for type '{recordType.FullName}'.");
}
if (map.Constructor is NewExpression)
{
body = Expression.MemberInit((NewExpression)map.Constructor, bindings);
}
else if (map.Constructor is MemberInitExpression)
{
var memberInitExpression = (MemberInitExpression)map.Constructor;
var defaultBindings = memberInitExpression.Bindings.ToList();
defaultBindings.AddRange(bindings);
body = Expression.MemberInit(memberInitExpression.NewExpression, defaultBindings);
}
else
{
// This is in case an IContractResolver is being used.
var type = ReflectionHelper.CreateInstance(recordType).GetType();
body = Expression.MemberInit(Expression.New(type), bindings);
}
}
var funcType = typeof(Func <>).MakeGenericType(recordType);
return(Expression.Lambda(funcType, body).Compile());
}
/// <summary>
/// Creates a <see cref="Delegate"/> of type <see cref="Func{T}"/>
/// that will create a record of the given type using the current
/// reader row.
/// </summary>
/// <param name="recordType">The record type.</param>
protected override Delegate CreateCreateRecordDelegate(Type recordType)
{
if (Reader.Context.Maps[recordType] == null)
{
Reader.Context.Maps.Add(Reader.Context.AutoMap(recordType));
}
var map = Reader.Context.Maps[recordType];
Expression body;
if (map.ParameterMaps.Count > 0)
{
// This is a constructor parameter type.
var arguments = new List <Expression>();
ExpressionManager.CreateConstructorArgumentExpressionsForMapping(map, arguments);
var args = new GetConstructorArgs
{
ClassType = map.ClassType
};
body = Expression.New(Reader.Configuration.GetConstructor(args), arguments);
}
else
{
var assignments = new List <MemberAssignment>();
ExpressionManager.CreateMemberAssignmentsForMapping(map, assignments);
if (assignments.Count == 0)
{
throw new ReaderException(Reader.Context, $"No members are mapped for type '{recordType.FullName}'.");
}
body = ExpressionManager.CreateInstanceAndAssignMembers(recordType, assignments);
}
var funcType = typeof(Func <>).MakeGenericType(recordType);
return(Expression.Lambda(funcType, body).Compile());
}
/// <summary>
/// Creates a <see cref="Delegate"/> of type <see cref="Action{T}"/>
/// that will write the given record using the current writer row.
/// </summary>
/// <typeparam name="T">The record type.</typeparam>
/// <param name="record">The record.</param>
protected override Action <T> CreateWriteDelegate <T>(T record)
{
var type = Writer.GetTypeForRecord(record);
if (Writer.Context.WriterConfiguration.Maps[type] == null)
{
Writer.Context.WriterConfiguration.Maps.Add(Writer.Context.WriterConfiguration.AutoMap(type));
}
var recordParameter = Expression.Parameter(typeof(T), "record");
var recordParameterConverted = Expression.Convert(recordParameter, type);
// Get a list of all the members so they will
// be sorted properly.
var members = new MemberMapCollection();
members.AddMembers(Writer.Context.WriterConfiguration.Maps[type]);
if (members.Count == 0)
{
throw new WriterException(Writer.Context, $"No properties are mapped for type '{type.FullName}'.");
}
var delegates = new List <Action <T> >();
foreach (var memberMap in members)
{
if (memberMap.Data.WritingConvertExpression != null)
{
// The user is providing the expression to do the conversion.
Expression exp = Expression.Invoke(memberMap.Data.WritingConvertExpression, recordParameterConverted);
exp = Expression.Call(Expression.Constant(Writer), nameof(Writer.WriteConvertedField), null, exp);
delegates.Add(Expression.Lambda <Action <T> >(exp, recordParameter).Compile());
continue;
}
if (!Writer.CanWrite(memberMap))
{
continue;
}
Expression fieldExpression;
if (memberMap.Data.IsConstantSet)
{
if (memberMap.Data.Constant == null)
{
fieldExpression = Expression.Constant(string.Empty);
}
else
{
fieldExpression = Expression.Constant(memberMap.Data.Constant);
var typeConverterExpression = Expression.Constant(Writer.Configuration.TypeConverterCache.GetConverter(memberMap.Data.Constant.GetType()));
var method = typeof(ITypeConverter).GetMethod(nameof(ITypeConverter.ConvertToString));
fieldExpression = Expression.Convert(fieldExpression, typeof(object));
fieldExpression = Expression.Call(typeConverterExpression, method, fieldExpression, Expression.Constant(Writer), Expression.Constant(memberMap.Data));
}
}
else
{
if (memberMap.Data.TypeConverter == null)
{
// Skip if the type isn't convertible.
continue;
}
fieldExpression = ExpressionManager.CreateGetMemberExpression(recordParameterConverted, Writer.Context.WriterConfiguration.Maps[type], memberMap);
var typeConverterExpression = Expression.Constant(memberMap.Data.TypeConverter);
memberMap.Data.TypeConverterOptions = TypeConverterOptions.Merge(new TypeConverterOptions {
CultureInfo = Writer.Context.WriterConfiguration.CultureInfo
}, Writer.Context.WriterConfiguration.TypeConverterOptionsCache.GetOptions(memberMap.Data.Member.MemberType()), memberMap.Data.TypeConverterOptions);
var method = typeof(ITypeConverter).GetMethod(nameof(ITypeConverter.ConvertToString));
fieldExpression = Expression.Convert(fieldExpression, typeof(object));
fieldExpression = Expression.Call(typeConverterExpression, method, fieldExpression, Expression.Constant(Writer), Expression.Constant(memberMap.Data));
if (type.GetTypeInfo().IsClass)
{
var areEqualExpression = Expression.Equal(recordParameterConverted, Expression.Constant(null));
fieldExpression = Expression.Condition(areEqualExpression, Expression.Constant(string.Empty), fieldExpression);
}
}
var writeFieldMethodCall = Expression.Call(Expression.Constant(Writer), nameof(Writer.WriteConvertedField), null, fieldExpression);
delegates.Add(Expression.Lambda <Action <T> >(writeFieldMethodCall, recordParameter).Compile());
}
var action = CombineDelegates(delegates);
return(action);
}
/// <summary>
/// Creates a new instance using the given reader.
/// </summary>
/// <param name="reader">The reader.</param>
public RecordHydrator(CsvReader reader)
{
this.reader = reader;
expressionManager = new ExpressionManager(reader);
}
/// <summary>
/// Initializes a new instance using the given writer.
/// </summary>
/// <param name="writer">The writer.</param>
public RecordWriter(CsvWriter writer)
{
Writer = writer;
ExpressionManager = new ExpressionManager(writer);
}
/// <summary>
/// Initializes a new instance using the given writer.
/// </summary>
/// <param name="writer">The writer.</param>
public RecordWriter(CsvWriter writer)
{
Writer = writer;
ExpressionManager = ObjectResolver.Current.Resolve <ExpressionManager>(writer);
}
/// <summary>
/// Initializes a new instance using the given reader.
/// </summary>
/// <param name="reader">The reader.</param>
public RecordCreator(CsvReader reader)
{
Reader = reader;
ExpressionManager = new ExpressionManager(reader);
}
/// <summary>
/// Creates a new instance using the given reader.
/// </summary>
/// <param name="reader">The reader.</param>
public RecordHydrator(CsvReader reader)
{
this.reader = reader;
expressionManager = ObjectResolver.Current.Resolve <ExpressionManager>(reader);
}
