// Given a control's type, returns the adapter type to be used.
// Note that it's legal to not register an adapter type for each
// control type.
//
// This lookup uses the following steps:
//
// (1) Look up the control type directly, to see if an adapter type
// has been registered for it.
// (2) Walk up the control inheritance chain, to see if an adapter type
// has been registered for the class. For example, if the passed
// control type is a validator, check BaseValidator, Label,
// TextControl, and finally MobileControl.
// (3) If no adapter type has still been found, call the parent configuration,
// if any, to look up the adapter type. For example, the CHTML device
// configuration would call the HTML device configuration.
// (4) If an adapter type is found, but is not explicitly registered for
// the passed control type, add an entry to the table, so that
// subsequent requests do not need to walk the hierarchy.
protected IWebObjectFactory GetAdapterFactory(Type originalControlType)
{
Debug.Assert(_parentConfigName == null);
Type controlType = originalControlType;
IWebObjectFactory factory = LookupControl(controlType, true); // Look in type cache
// Walk up hierarchy looking for registered adapters.
// Stop when we get to the base control.
while (factory == null && controlType != _baseControlType)
{
factory = LookupControl(controlType);
if (factory == null)
{
controlType = controlType.BaseType;
}
}
// Could not find one in the current hierarchy. So, look it up in
// the parent config if there is one.
if (factory == null && _parentConfig != null)
{
factory = _parentConfig.GetAdapterFactory(originalControlType);
}
if (factory == null)
{
throw new Exception(
SR.GetString(SR.IndividualDeviceConfig_ControlWithIncorrectPageAdapter,
controlType.FullName, _pageAdapterType.FullName));
}
if (controlType != originalControlType)
{
// Add to lookup cache, so the next lookup won't require
// traversing the hierarchy.
// Grab writer lock...
using (new ReaderWriterLockResource(_controlAdapterTypesLock,
true))
{
_controlAdapterLookupCache[originalControlType] = factory;
}
}
return(factory);
}
