The TypeResolver class
The Email Experience Manager (EXM) enables you to create different types of messages. To map a message type to the appropriate class in code, EXM uses the TypeResolver class.
EXM provides the following message type classes that are derived from the MessageItem base abstract class:
TextMailHtmlMailWebPageMailABTestMessage
For customization purposes, you can create a custom message type class to be used in EXM or delete any of the existing classes.
Depending on the item type, the GetCorrectMessageObject method of the TypeResolver class returns:
- For not a message item, the method returns
null. - For a message item, the method returns one of the following types – text mail, HTML mail, webpage mail, or A/B test message.
The following table shows how EXM message templates correspond to the message type classes:
| Message template | Message type class |
|---|---|
| HTML file | The ABTestMessage class |
| Announcement | The ABTestMessage class |
| Alternating Columns | The ABTestMessage class |
| Call to Action Focus | The ABTestMessage class |
| Image Focus | The ABTestMessage class |
| Left Image Block | The ABTestMessage class |
| Right Image Block | The ABTestMessage class |
| Simple HTML Message | The HtmlMail class |
| Plain Text Message | The TextMail class |
| Existing Page | The WebPageMail class |
The ABTestMessage class is a descendant of the WebPageMail class. It is generally used for messages that contain two or more testable variations, except for the HTML file template, which does not support A/B testing. A/B tests also cannot be performed on the message types that are mapped to the other classes: Simple HTML Message, Plain Text Message, and Existing Page.