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Copy pathObjectDataModelReader.cs
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201 lines (159 loc) · 5.05 KB
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using DataKit.Modelling.TypeModels;
using System;
using System.Collections;
using System.Collections.Generic;
namespace DataKit.Mapping
{
public class ObjectDataModelReader<TRoot> : IDataModelReader<TypeModel<TRoot>, PropertyField>
{
private readonly TRoot _root;
private readonly Stack<StackItem> _objectStack
= new Stack<StackItem>();
public TypeModel<TRoot> Model { get; }
public ObjectDataModelReader(TRoot root)
{
Model = TypeModel.GetModelOf<TRoot>();
_objectStack.Push(new ObjectStackItem(
ObjectReaderWriter.ObjectReaderWriter.Get<TRoot>(),
root,
TypeModel.GetModelOf<TRoot>()
));
_root = root;
}
protected void PushOntoMemberStack(StackItem stackItem)
=> _objectStack.Push(stackItem);
protected StackItem PopFromMemberStack()
=> _objectStack.Pop();
private void EnsureFieldReadable(PropertyField field)
{
if (field == null)
throw new ArgumentNullException(nameof(field));
if (!field.CanRead)
throw new ArgumentException("Field cannot be read.");
}
public T ReadField<T>(PropertyField field)
{
EnsureFieldReadable(field);
var reader = _objectStack.Peek()
.Reader
.GetReader(field);
return (T)reader(_objectStack.Peek().Object);
}
public bool CanEnterMember(PropertyField field)
{
if (field == null)
throw new ArgumentNullException(nameof(field));
if (!field.CanRead)
return false;
var reader = _objectStack.Peek()
.Reader
.GetReader(field);
var instance = reader(_objectStack.Peek().Object);
if (instance == null)
return false;
return true;
}
public void EnterMember(PropertyField field)
{
EnsureFieldReadable(field);
var reader = _objectStack.Peek()
.Reader
.GetReader(field);
var instance = reader(_objectStack.Peek().Object);
if (instance == null)
throw new InvalidOperationException("Cannot enter a member with a null value.");
_objectStack.Push(new ObjectStackItem(
ObjectReaderWriter.ObjectReaderWriter.Get(field.Property.PropertyType),
instance,
TypeModel.GetModelOf(field.Property.PropertyType)
));
}
public void LeaveMember()
{
_objectStack.Pop();
}
public bool MoveNext()
{
var currentItem = _objectStack.Peek();
if (!(currentItem is EnumeratorStackItem enumerator))
throw new InvalidOperationException("Current member is not enumerable.");
return enumerator.MoveNext();
}
public bool CanEnterEnumerable()
{
var currentItem = _objectStack.Peek();
if (!currentItem.TypeModel.Type.IsEnumerable)
return false;
return true;
}
public void EnterEnumerable()
{
var currentItem = _objectStack.Peek();
if (!currentItem.TypeModel.Type.IsEnumerable)
throw new InvalidOperationException("Current member is not enumerable.");
var enumerator = ((IEnumerable)currentItem.Object).GetEnumerator();
_objectStack.Push(new EnumeratorStackItem(
ObjectReaderWriter.ObjectReaderWriter.Get(currentItem.TypeModel.Type.ElementType),
TypeModel.GetModelOf(currentItem.TypeModel.Type.ElementType),
enumerator
));
}
public void LeaveEnumerable()
{
var currentItem = _objectStack.Peek();
if (!(currentItem is EnumeratorStackItem enumerator))
throw new InvalidOperationException("Current member is not enumerable.");
_objectStack.Pop();
enumerator.Dispose();
}
public abstract class StackItem
{
public abstract TypeModel TypeModel { get; }
public abstract ObjectReaderWriter.ObjectReaderWriter Reader { get; }
public abstract object Object { get; set; }
}
private class ObjectStackItem : StackItem
{
public ObjectStackItem(
ObjectReaderWriter.ObjectReaderWriter reader, object @object,
TypeModel typeModel)
{
Reader = reader ?? throw new ArgumentNullException(nameof(reader));
Object = @object;
TypeModel = typeModel ?? throw new ArgumentNullException(nameof(typeModel));
}
public ObjectStackItem(ObjectReaderWriter.ObjectReaderWriter reader, TypeModel typeModel)
{
Reader = reader ?? throw new ArgumentNullException(nameof(reader));
TypeModel = typeModel ?? throw new ArgumentNullException(nameof(typeModel));
}
public override TypeModel TypeModel { get; }
public override ObjectReaderWriter.ObjectReaderWriter Reader { get; }
public override object Object { get; set; }
}
private class EnumeratorStackItem : ObjectStackItem, IDisposable
{
private readonly IEnumerator _enumerator;
public EnumeratorStackItem(ObjectReaderWriter.ObjectReaderWriter reader, TypeModel typeModel, IEnumerator enumerator) :
base(reader, typeModel)
{
_enumerator = enumerator;
}
public bool MoveNext()
{
if (!_enumerator.MoveNext())
{
Object = null;
return false;
}
Object = _enumerator.Current;
return true;
}
public void Dispose()
{
if (_enumerator is IDisposable disposable)
disposable.Dispose();
}
}
}
}