/// <summary>
/// Builds the type handlers.
/// </summary>
/// <param name="store">The store.</param>
private void BuildTypeHandlers(IConfigurationStore store)
{
for (int i = 0; i < store.TypeHandlers.Length; i++)
{
/*typeHandlers节点信息格式
* <typeHandlers>
* <typeHandler type="string" callback="AnsiStringTypeHandler" />
* </typeHandlers>
*/
//store的TypeHandlers保存的是typeHandler自己点类对象
IConfiguration handlerConfig = store.TypeHandlers[i];
try
{
//_configScope.ErrorContext.Activity = "loading typeHandler";
//取出handlerConfig的节点属性而已
TypeHandler handler = TypeHandlerDeSerializer.Deserialize(handlerConfig);
//configScope.ErrorContext.MoreInfo = "Check the callback attribute '" + handler.CallBackName + "' (must be a classname).";
//根据ITypeHandler类型的Callback字符串反射对应的类
ITypeHandler typeHandler = null;
Type type = modelStore.DataExchangeFactory.TypeHandlerFactory.GetType(handler.Callback);
object impl = Activator.CreateInstance(type);
if (impl is ITypeHandlerCallback)//如果是自定义类型
{
typeHandler = new CustomTypeHandler((ITypeHandlerCallback)impl);
}
else if (impl is ITypeHandler)//如果是一般类型
{
typeHandler = (ITypeHandler)impl;
}
else
{
throw new ConfigurationException("The callBack type is not a valid implementation of ITypeHandler or ITypeHandlerCallback");
}
//configScope.ErrorContext.MoreInfo = "Check the type attribute '" + handler.ClassName + "' (must be a class name) or the dbType '" + handler.DbType + "' (must be a DbType type name).";
//如果数据库属性存在
if (handler.DbType != null && handler.DbType.Length > 0)
{
//就会将DbType类型放在Type对应的二级字典当中
modelStore.DataExchangeFactory.TypeHandlerFactory.Register(handler.Type, handler.DbType, typeHandler);
}
else
{
//将Type类型放入一级字典当中，其对应的字典中null对应typeHandler类对象
modelStore.DataExchangeFactory.TypeHandlerFactory.Register(handler.Type, typeHandler);
}
}
catch (Exception e)
{
throw new ConfigurationException(
String.Format("Error registering TypeHandler class \"{0}\" for handling .Net type \"{1}\" and dbType \"{2}\". Cause: {3}",
handlerConfig.GetAttributeValue("callback"),
handlerConfig.GetAttributeValue("type"),
handlerConfig.GetAttributeValue("dbType"),
e.Message), e);
}
}
}
/// <summary>
/// Builds the type handlers.
/// </summary>
/// <param name="store">The store.</param>
private void BuildTypeHandlers(IConfigurationStore store)
{
for (int i = 0; i < store.TypeHandlers.Length; i++)
{
IConfiguration handlerConfig = store.TypeHandlers[i];
try
{
//_configScope.ErrorContext.Activity = "loading typeHandler";
TypeHandler handler = TypeHandlerDeSerializer.Deserialize(handlerConfig);
//configScope.ErrorContext.MoreInfo = "Check the callback attribute '" + handler.CallBackName + "' (must be a classname).";
ITypeHandler typeHandler = null;
Type type = modelStore.DataExchangeFactory.TypeHandlerFactory.GetType(handler.Callback);
object impl = Activator.CreateInstance(type);
if (impl is ITypeHandlerCallback)
{
typeHandler = new CustomTypeHandler((ITypeHandlerCallback)impl);
}
else if (impl is ITypeHandler)
{
typeHandler = (ITypeHandler)impl;
}
else
{
throw new ConfigurationException("The callBack type is not a valid implementation of ITypeHandler or ITypeHandlerCallback");
}
//configScope.ErrorContext.MoreInfo = "Check the type attribute '" + handler.ClassName + "' (must be a class name) or the dbType '" + handler.DbType + "' (must be a DbType type name).";
if (handler.DbType != null && handler.DbType.Length > 0)
{
modelStore.DataExchangeFactory.TypeHandlerFactory.Register(handler.Type, handler.DbType, typeHandler);
}
else
{
modelStore.DataExchangeFactory.TypeHandlerFactory.Register(handler.Type, typeHandler);
}
}
catch (Exception e)
{
throw new ConfigurationException(
String.Format("Error registering TypeHandler class \"{0}\" for handling .Net type \"{1}\" and dbType \"{2}\". Cause: {3}",
handlerConfig.GetAttributeValue("callback"),
handlerConfig.GetAttributeValue("type"),
handlerConfig.GetAttributeValue("dbType"),
e.Message), e);
}
}
}