internal static void ValidateDefinitionAndThrow(Type entityType)
{
if (!entityType.IsVisible)
{
throw new EntityValidationException(
string.Format("Class <{0}> must be visible from current assembly. Declare class as public ",
entityType.Name));
}
var typeDescription = EntityTypeDescriptor.GetTypeDescription(entityType);
if (!typeDescription.AllKeys.Any())
{
throw new EntityValidationException(
string.Format(
"Entity <{0}> must declare at least one primary key with <IsPrimaryKey> property of <Column> attribute",
entityType.Name));
}
if (typeDescription.IdentityKeys.Any(k => !IsIdentitySupportedType(k.ColumnInfo.PropertyType)))
{
throw new EntityValidationException(
"Only integral types (short, int or long) supported as DbGenerated column");
}
if (typeDescription.IdentityKeys.Count() > 1)
{
throw new EntityValidationException("Only one DbGenerated column is allowed");
}
if (typeDescription.IdentityKeys.Any() && typeDescription.CustomKeys.Any())
{
throw new EntityValidationException("Either DbGenerated primary key or custom primary keys are allowed");
}
}
private static string SerializeColumnToString <T>(T column)
{
if (column == null)
{
return("null");
}
var columnType = column.GetType();
var result = new StringBuilder();
if (EntityTypeDescriptor.IsSimpleType(columnType) || EntityTypeDescriptor.IsNullableType(columnType))
{
result.Append(column);
}
else if (EntityTypeDescriptor.IsSupportedEnumerable(columnType))
{
var enumerable = column as IEnumerable;
foreach (var item in enumerable)
{
result.AppendFormat("{0},", SerializeColumnToString(item));
}
}
else
{
var typeDescription = EntityTypeDescriptor.GetTypeDescription(columnType);
foreach (var item in typeDescription.Columns)
{
result.AppendFormat("{0}={1}\n", item.ColumnAttribute.Name ?? item.ColumnInfo.Name,
SerializeColumnToString(item.ColumnInfo.GetValue(column, null)));
}
}
return(result.ToString());
}
private static void AppendPrimaryKey <TEntity>(TEntity entity, NodeReference node)
{
var typeDescription = EntityTypeDescriptor.GetTypeDescription(entity.GetType());
var identityKeys = typeDescription.IdentityKeys;
if (identityKeys.Any())
{
//according to the validation rules
var identityKey = identityKeys.Single();
var newSeed = IncrementIdentity(node);
var propertyType = identityKey.ColumnInfo.PropertyType;
propertyType = !EntityTypeDescriptor.IsNullableType(propertyType)
? propertyType
: Nullable.GetUnderlyingType(propertyType);
var correctValue = Convert.ChangeType(newSeed, propertyType);
identityKey.ColumnInfo.SetValue(entity, correctValue, null);
node.AppendSubscript(newSeed);
}
else
{
var hash = PrimaryKeyCalculator.GetPrimaryKey(entity);
if (IsKeyExists(hash, node))
{
throw new GlobalsDbException("Violation of Primary Key constraint. Cannot insert duplicate key");
}
node.SetSubscriptCount(0);
node.AppendSubscript(hash);
}
}
private static void WriteComplexEntity <TEntity>(TEntity entity, NodeReference node)
{
if (entity == null)
{
return;
}
var entityType = entity.GetType();
var underlyingType = EntityTypeDescriptor.IsNullableType(entityType)
? Nullable.GetUnderlyingType(entityType)
: entityType;
var columns = EntityTypeDescriptor.GetTypeDescription(underlyingType).Columns;
foreach (var column in columns)
{
node.AppendSubscript(column.ColumnAttribute.Name ?? column.ColumnInfo.Name);
if (column.IsSimpleColumn)
{
var value = column.ColumnInfo.GetValue(entity, null);
if (value != null)
{
if (column.IsNullableColumn)
{
node.Set(value != null ? value.ToString() : null);
}
else
{
node.Set(value.ToString());
}
}
}
else if (column.IsArrayColumn)
{
var array = column.ColumnInfo.GetValue(entity, null) as Array;
WriteArray(node, array);
}
else if (column.IsEnumerableColumn)
{
var items = column.ColumnInfo.GetValue(entity, null) as IEnumerable;
if (items != null)
{
WriteEnumerable(node, items);
}
}
else
{
WriteComplexEntity(column.ColumnInfo.GetValue(entity, null), node);
}
node.SetSubscriptCount(node.GetSubscriptCount() - 1);
}
}
private DbSet(DataContext context)
{
Context = context;
_dbSetName = typeof(TEntity).Name;
var dbSetAttribute = EntityTypeDescriptor.GetTypeDescription(typeof(TEntity)).DbSetAttribute;
if (dbSetAttribute != null)
{
_dbSetName = dbSetAttribute.Name ?? _dbSetName;
}
}
private static object ReadComplexNode(NodeReference node, Type objectType)
{
var isNullable = EntityTypeDescriptor.IsNullableType(objectType);
if (isNullable && IsNullableComplexColumnEmpty(node))
{
return(null);
}
var underlyingType = !isNullable
? objectType
: Nullable.GetUnderlyingType(objectType);
var typeDescription = EntityTypeDescriptor.GetTypeDescription(underlyingType);
var instance = InstanceCreator.CreateInstance(underlyingType);
foreach (var column in typeDescription.Columns)
{
var subscript = column.ColumnAttribute.Name ?? column.ColumnInfo.Name;
if (column.IsSimpleColumn)
{
node.AppendSubscript(subscript);
var nodeValue = node.GetObject();
column.ColumnInfo.SetValue(instance, ConvertValue(nodeValue, column.ColumnInfo.PropertyType), null);
}
else if (column.IsArrayColumn)
{
node.AppendSubscript(subscript);
column.ColumnInfo.SetValue(instance, ReadArray(node, column.ColumnInfo.PropertyType), null);
}
else if (column.IsEnumerableColumn)
{
node.AppendSubscript(subscript);
column.ColumnInfo.SetValue(instance, ReadEnumerable(node, column.ColumnInfo.PropertyType), null);
}
else if (column.IsComplexColumn)
{
node.AppendSubscript(subscript);
column.ColumnInfo.SetValue(instance,
ReadComplexNode(node, column.ColumnInfo.PropertyType), null);
}
node.SetSubscriptCount(node.GetSubscriptCount() - 1);
}
return(instance);
}
public static string GetPrimaryKey <TEntity>(TEntity entity)
{
var typeDescription = EntityTypeDescriptor.GetTypeDescription(entity.GetType());
var identityKeys = typeDescription.IdentityKeys;
if (identityKeys.Any())
{
//according to the validation rules
return(identityKeys.Single().ColumnInfo.GetValue(entity, null).ToString());
}
var primaryKeys = new NameValueCollection();
foreach (var key in typeDescription.CustomKeys)
{
primaryKeys.Add(key.ColumnAttribute.Name ?? key.ColumnInfo.Name, SerializeColumnToString(key.ColumnInfo.GetValue(entity, null)));
}
return(CryptoProvider.CalculatePrimaryKeyHash(primaryKeys));
}
