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Copy pathObjectDataModelWriter.cs
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199 lines (165 loc) · 5.6 KB
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using DataKit.Modelling.TypeModels;
using System;
using System.Collections.Generic;
namespace DataKit.Mapping
{
public class ObjectDataModelWriter<TRoot> : IDataModelWriter<TypeModel<TRoot>, PropertyField>
{
private readonly TRoot _root;
private readonly Stack<StackItem> _objectStack
= new Stack<StackItem>();
private readonly IObjectFactory _objectFactory;
public TypeModel<TRoot> Model { get; }
public ObjectDataModelWriter(TRoot root, IObjectFactory objectFactory = null)
{
_objectFactory = objectFactory ?? DefaultObjectFactory.Instance;
Model = TypeModel.GetModelOf<TRoot>();
_objectStack.Push(new StackItem(
ObjectReaderWriter.ObjectReaderWriter.Get<TRoot>(),
root,
TypeModel.GetModelOf<TRoot>()
));
_root = root;
}
private void EnsureFieldWritable(PropertyField field)
{
if (field == null)
throw new ArgumentNullException(nameof(field));
if (!field.CanWrite)
throw new ArgumentException("Field cannot be written.");
}
public void LeaveMember()
{
var item = _objectStack.Pop();
if (item.Field == null)
throw new InvalidOperationException("Leaving member in invalid state.");
// commit the built object to it's parent
var currentItem = _objectStack.Peek();
var writer = currentItem.Writer.GetWriter(item.Field);
writer(currentItem.Object, item.Object);
}
public void EnterMember(PropertyField field)
{
EnsureFieldWritable(field);
var typeModel = TypeModel.GetModelOf(field.Property.PropertyType);
if (typeModel.Type.IsPureEnumerable)
{
_objectStack.Push(new MutableStackItem(
ObjectReaderWriter.ObjectReaderWriter.Get(typeModel.Type.Type),
typeModel,
field
));
}
else if (!typeModel.Type.IsAnonymousType)
{
_objectStack.Push(new StackItem(
ObjectReaderWriter.ObjectReaderWriter.Get(typeModel.Type.Type),
_objectFactory.CreateInstance(typeModel.Type.Type),
typeModel,
field
));
}
else
throw new NotSupportedException("Anonymous types not supported.");
}
public void WriteField<T>(PropertyField field, T value)
{
EnsureFieldWritable(field);
var writer = _objectStack.Peek().Writer.GetWriter(field);
writer(_objectStack.Peek().Object, value);
}
public void EnterEnumerable()
{
var currentItem = _objectStack.Peek();
if (!currentItem.TypeModel.Type.IsEnumerable)
throw new InvalidOperationException("Current member is not enumerable.");
_objectStack.Push(new EnumerableStackItem(
ObjectReaderWriter.ObjectReaderWriter.Get(currentItem.TypeModel.Type.ElementType),
TypeModel.GetModelOf(currentItem.TypeModel.Type.ElementType),
currentItem.Field
));
}
public void LeaveEnumerable()
{
var currentItem = _objectStack.Peek();
if (!(currentItem is EnumerableStackItem enumerableItem))
throw new InvalidOperationException("Current member is not enumerable.");
_objectStack.Pop();
// commit the built object to it's parent
currentItem = _objectStack.Peek();
if (!(currentItem is MutableStackItem mutableItem))
throw new InvalidOperationException("Current member is not pure enumerable.");
mutableItem.SetObject(enumerableItem.GetItems());
}
public void MoveNext()
{
var currentItem = _objectStack.Peek();
if (!(currentItem is EnumerableStackItem enumerableStackItem))
throw new InvalidOperationException("Current member is not enumerable.");
if (currentItem.TypeModel.Type.IsPureEnumerable)
{
throw new NotSupportedException("Multi-dimensional enumerables not supported.");
}
else if (!currentItem.TypeModel.Type.IsAnonymousType)
{
enumerableStackItem.MoveNext(
_objectFactory.CreateInstance(currentItem.TypeModel.Type.Type)
);
}
else
throw new NotImplementedException("Anonymous types not supported yet.");
}
private class StackItem
{
public StackItem(
ObjectReaderWriter.ObjectReaderWriter writer, object @object,
TypeModel typeModel, PropertyField field = null)
{
Writer = writer ?? throw new ArgumentNullException(nameof(writer));
Object = @object ?? throw new ArgumentNullException(nameof(@object));
TypeModel = typeModel ?? throw new ArgumentNullException(nameof(typeModel));
Field = field;
}
public StackItem(
ObjectReaderWriter.ObjectReaderWriter writer,
TypeModel typeModel, PropertyField field = null)
{
Writer = writer ?? throw new ArgumentNullException(nameof(writer));
TypeModel = typeModel ?? throw new ArgumentNullException(nameof(typeModel));
Field = field;
}
public PropertyField Field { get; }
public TypeModel TypeModel { get; }
public ObjectReaderWriter.ObjectReaderWriter Writer { get; }
public object Object { get; protected set; }
}
private class MutableStackItem : StackItem
{
public MutableStackItem(
ObjectReaderWriter.ObjectReaderWriter writer, TypeModel typeModel,
PropertyField field) : base(writer, typeModel, field)
{
}
public void SetObject(object @object)
{
Object = @object;
}
}
private class EnumerableStackItem : StackItem
{
private readonly List<object> _items =
new List<object>();
public EnumerableStackItem(
ObjectReaderWriter.ObjectReaderWriter writer, TypeModel typeModel,
PropertyField field) : base(writer, typeModel, field)
{
}
public List<object> GetItems() => _items;
public void MoveNext(object newObject)
{
_items.Add(newObject);
Object = newObject;
}
}
}
}