protected override object GetInstance(string id)
{
if (string.IsNullOrEmpty(id))
{
return(JsonEntity.CreateNew(_type));
}
return(_entityContext.Fetch(_type, int.Parse(id)));
}
public object Fetch(Type type, int id)
{
if (!supportedTypes.Contains(type))
{
throw new NotSupportedException("Type '" + type.Name + "' is not supported.");
}
IJsonEntity entity;
Dictionary <int, IJsonEntity> typeEntities;
if (!_existingEntities.TryGetValue(type, out typeEntities))
{
_existingEntities[type] = typeEntities = new Dictionary <int, IJsonEntity>();
}
else if (typeEntities.TryGetValue(id, out entity))
{
return(entity);
}
Dictionary <string, object> entityData;
var typeData = GetTypeData(type);
if (!typeData.TryGetValue(id.ToString(CultureInfo.InvariantCulture), out entityData))
{
return(null);
}
entity = JsonEntity.CreateExisting(type, id, _defaultConstructors);
typeEntities[id] = entity;
if (autoInitializeEntities)
{
InitializeInstance(type, entity, entityData);
}
return(entity);
}
public static void BeforeGet(TEntity entity, string property)
{
if (!entity.IsInitialized.HasValue)
{
entity.IsInitialized = false;
if (entity.Id.HasValue)
{
JsonEntity.OnInitExisting(entity);
}
else
{
JsonEntity.OnInitNew(entity);
}
// Initialize reference list properties.
foreach (var p in entity.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
Type listItemType;
if (JsonEntity.TryGetListItemType(p.PropertyType, out listItemType))
{
var list = p.GetValue(entity, null);
if (list == null)
{
p.SetValue(entity, CreateList(listItemType), null);
}
}
}
entity.IsInitialized = true;
}
if (entity.IsInitialized.Value)
{
// Raise property get notifications
((IModelInstance)entity).Instance.OnPropertyGet(property);
}
}
public IEnumerable FetchAll(Type type)
{
if (!supportedTypes.Contains(type))
{
throw new NotSupportedException("Type '" + type.Name + "' is not supported.");
}
Dictionary <int, IJsonEntity> typeEntities;
if (!_existingEntities.TryGetValue(type, out typeEntities))
{
typeEntities = new Dictionary <int, IJsonEntity>();
_existingEntities[type] = typeEntities;
}
var typeData = GetTypeData(type);
lock (typeData)
{
foreach (var key in typeData.Keys)
{
var id = int.Parse(key);
var entity = JsonEntity.CreateExisting(type, id, _defaultConstructors);
typeEntities[id] = entity;
if (autoInitializeEntities)
{
InitializeInstance(type, entity, typeData[key]);
}
}
}
return(typeEntities.Values);
}
internal bool IsModified(IJsonEntity entity)
{
var type = entity.GetType();
var id = entity.Id;
if (_deletedEntities.Contains(entity))
{
if (!id.HasValue)
{
throw new Exception("Accessed deleted entity with no id: " + type.Name + "|.");
}
throw new Exception("Accessed deleted entity: " + type.Name + "|" + id + ".");
}
if (_pendingDeleteEntities.Contains(entity))
{
return(true);
}
if (_newEntities.Contains(entity))
{
return(true);
}
if (!id.HasValue)
{
throw new Exception("Found existing entity with no id: " + type.Name + "|.");
}
var typeData = GetTypeData(type);
Dictionary <string, object> instanceData;
if (typeData == null || !typeData.TryGetValue(id.Value.ToString(CultureInfo.InvariantCulture), out instanceData))
{
throw new Exception("Couldn't find data for existing entity: " + type.Name + "|.");
}
foreach (var property in type.GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
if (property.Name == "Id")
{
continue;
}
var value = property.GetValue(entity, null);
var propertyType = property.PropertyType;
object propertyData;
var hasPropertyData = instanceData.TryGetValue(property.Name, out propertyData);
Type referenceType;
bool isReferenceList;
if (JsonEntity.TryGetReferenceType(propertyType, supportedTypes, out referenceType, out isReferenceList))
{
if (isReferenceList)
{
var referenceIds = new List <int>();
foreach (IJsonEntity reference in (IEnumerable)value)
{
var referenceId = reference.Id;
if (!referenceId.HasValue)
{
throw new InvalidOperationException();
}
referenceIds.Add(referenceId.Value);
}
if (!hasPropertyData || IsReferenceListModified(referenceIds.ToArray(), propertyData))
{
return(true);
}
}
else
{
var referenceId = ((IJsonEntity)value).Id;
if (!referenceId.HasValue)
{
throw new InvalidOperationException();
}
if (!hasPropertyData || IsReferenceModified(referenceId, propertyData))
{
return(true);
}
}
}
else if (!hasPropertyData || IsValueModified(value, propertyData))
{
return(true);
}
}
return(false);
}
private void UpdateData(Type type, IJsonEntity entity, bool allowDelete, out Type[] affectedTypes, out object[] addedEntities, out object[] removedEntities)
{
var affected = new List <Type>();
var added = new List <object>();
var removed = new List <object>();
var typeData = GetTypeData(type, true);
if (_deletedEntities.Contains(entity))
{
var id = entity.Id;
if (!id.HasValue)
{
throw new Exception("Found deleted entity with no id: " + type.Name + "|.");
}
throw new Exception("Found deleted entity: " + type.Name + "|" + id + ".");
}
if (_pendingDeleteEntities.Contains(entity))
{
var id = entity.Id;
if (!allowDelete)
{
throw new Exception("Cannot delete entity: " + type.Name + "|" + id + ".");
}
// Only need to delete Entities that were actually saved previously.
if (id.HasValue)
{
if (typeData.ContainsKey(id.Value.ToString(CultureInfo.InvariantCulture)))
{
typeData.Remove(id.Value.ToString(CultureInfo.InvariantCulture));
}
removed.Add(entity);
affected.Add(type);
if (!_deletedEntities.Contains(entity))
{
_deletedEntities.Add(entity);
}
}
_pendingDeleteEntities.Remove(entity);
}
else
{
var updated = false;
Dictionary <string, object> instanceData;
if (_newEntities.Contains(entity))
{
int newId;
if (typeData.Count == 0)
{
newId = 1;
}
else
{
var largestId = typeData.Keys.Max(k => int.Parse(k));
newId = largestId + 1;
}
entity.Id = newId;
typeData[newId.ToString(CultureInfo.InvariantCulture)] = instanceData = new Dictionary <string, object>();
_newEntities.Remove(entity);
added.Add(entity);
Dictionary <int, IJsonEntity> instanceCache;
if (!_existingEntities.TryGetValue(type, out instanceCache))
{
_existingEntities[type] = instanceCache = new Dictionary <int, IJsonEntity>();
}
instanceCache[newId] = entity;
updated = true;
}
else
{
var id = entity.Id;
if (!id.HasValue)
{
throw new Exception("Found existing entity with no id: " + type.Name + "|.");
}
if (!typeData.TryGetValue(id.Value.ToString(CultureInfo.InvariantCulture), out instanceData))
{
throw new Exception("Couldn't find data for existing entity: " + type.Name + "|.");
}
}
foreach (var property in type.GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
if (property.Name == "Id")
{
continue;
}
var value = property.GetValue(entity, null);
object serializedValue;
var propertyType = property.PropertyType;
object propertyData;
var hasPropertyData = instanceData.TryGetValue(property.Name, out propertyData);
Type referenceType;
bool isReferenceList;
if (JsonEntity.TryGetReferenceType(propertyType, supportedTypes, out referenceType, out isReferenceList))
{
if (isReferenceList)
{
var references = ((IEnumerable)value).Cast <IJsonEntity>().ToArray();
var referenceIds = new List <int>();
foreach (var reference in references)
{
Type[] refAffectedTypes;
object[] refAdded;
object[] refRemoved;
UpdateData(referenceType, reference, false, out refAffectedTypes, out refAdded, out refRemoved);
affected.AddRange(refAffectedTypes);
added.AddRange(refAdded);
removed.AddRange(refRemoved);
var referenceId = reference.Id;
if (!referenceId.HasValue)
{
throw new InvalidOperationException();
}
referenceIds.Add(referenceId.Value);
}
serializedValue = referenceIds.ToArray();
if (!hasPropertyData)
{
updated = true;
}
else
{
if (IsReferenceListModified(referenceIds.ToArray(), propertyData))
{
updated = true;
}
var persistedReferences = ((IEnumerable)propertyData).Cast <object>().Select(i => (int)Convert.ChangeType(i, typeof(int))).ToArray();
foreach (var priorReference in persistedReferences.Select(id => Fetch(referenceType, id)).Where(r => !references.Contains(r)))
{
Type[] refAffectedTypes;
object[] refAdded;
object[] refRemoved;
UpdateData(referenceType, (IJsonEntity)priorReference, true, out refAffectedTypes, out refAdded, out refRemoved);
affected.AddRange(refAffectedTypes);
added.AddRange(refAdded);
removed.AddRange(refRemoved);
}
}
}
else
{
int?referenceId;
if (value == null)
{
referenceId = null;
}
else
{
Type[] refAffectedTypes;
object[] refAdded;
object[] refRemoved;
UpdateData(referenceType, (IJsonEntity)value, false, out refAffectedTypes, out refAdded, out refRemoved);
affected.AddRange(refAffectedTypes);
added.AddRange(refAdded);
removed.AddRange(refRemoved);
referenceId = ((IJsonEntity)value).Id;
if (!referenceId.HasValue)
{
throw new InvalidOperationException();
}
}
serializedValue = referenceId;
if (!hasPropertyData)
{
updated = true;
}
else
{
if (IsReferenceModified(referenceId, propertyData))
{
updated = true;
}
if (propertyData != null)
{
var priorReferenceId = (int?)propertyData;
if (priorReferenceId != referenceId)
{
var priorReference = (IJsonEntity)Fetch(referenceType, priorReferenceId.Value);
Type[] refAffectedTypes;
object[] refAdded;
object[] refRemoved;
UpdateData(referenceType, priorReference, true, out refAffectedTypes, out refAdded, out refRemoved);
affected.AddRange(refAffectedTypes);
added.AddRange(refAdded);
removed.AddRange(refRemoved);
}
}
}
}
}
else
{
serializedValue = value;
if (!hasPropertyData || IsValueModified(value, propertyData))
{
updated = true;
}
}
instanceData[property.Name] = serializedValue;
}
if (updated)
{
affected.Add(type);
}
}
affectedTypes = affected.ToArray();
addedEntities = added.ToArray();
removedEntities = removed.ToArray();
}
private void InitializeInstance(IReflect type, IJsonEntity entity, Dictionary <string, object> data)
{
var jsonProperties = data.Keys.ToArray();
foreach (var property in type.GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
var propertyType = property.PropertyType;
Type referenceType;
bool isReferenceList;
object propData;
if (jsonProperties.Contains(property.Name))
{
propData = data[property.Name];
}
else
{
propData = null;
if (JsonEntity.TryGetReferenceType(propertyType, supportedTypes, out referenceType, out isReferenceList))
{
if (isReferenceList)
{
var list = JsonEntityAdapter <JsonEntity> .CreateList(referenceType);
property.SetValue(entity, list, null);
}
}
}
if (propData == null)
{
continue;
}
object value;
if (JsonEntity.TryGetReferenceType(propertyType, supportedTypes, out referenceType, out isReferenceList))
{
if (isReferenceList)
{
var list = JsonEntityAdapter <JsonEntity> .CreateList(referenceType);
var addMethod = list.GetType().GetMethod("Add", BindingFlags.Instance | BindingFlags.Public, null, new[] { referenceType }, null);
foreach (var referenceId in (IEnumerable)propData)
{
var reference = Fetch(referenceType, (int)Convert.ChangeType(referenceId, typeof(int)));
if (reference == null)
{
throw new InvalidOperationException();
}
addMethod.Invoke(list, new[] { reference });
}
value = list;
}
else
{
var referenceId = (int)Convert.ChangeType(propData, typeof(int));
value = Fetch(referenceType, referenceId);
}
}
else
{
Type targetType;
if (!TryGetNullableType(propertyType, out targetType))
{
targetType = propertyType;
}
if (targetType == typeof(DateTime) && propData is string)
{
value = DateTime.Parse((string)propData);
}
else if (propData.GetType() != targetType)
{
value = Convert.ChangeType(propData, targetType);
}
else
{
value = propData;
}
}
property.SetValue(entity, value, null);
}
}
