Generic Support for javaClientGenerator

[OxLeOx]

Summary

Implemented generic type support for the rootInterface property in MyBatis Generator, addressing issue #1346.

Changes Made:

1. Added utility method in AbstractJavaClientGenerator:

   • processRootInterfaceWithGenerics(): Processes the rootInterface string and replaces generic placeholders (e.g., <T>, <T extends Entity>) with the actual record type from the introspected table

   • isGenericPlaceholder(): Detects if the generic content is a placeholder (single uppercase letter like T, E, K, V, optionally with "extends" or "super" clause)

2. Updated all three Java client generators:

   • JavaMapperGenerator

   • SimpleJavaClientGenerator

   • DynamicSqlMapperGenerator

3. Updated documentation:

   • Added "Generic Type Support" section to both javaClientGenerator.xhtml and table.xhtml documentation files

4. How It Works:

   • If you specify rootInterface="BaseMapper<T>", it becomes BaseMapper<com.example.User> for a User table
   • If you specify rootInterface="BaseMapper<T extends Entity>", it becomes BaseMapper<com.example.User>
   • If you specify rootInterface="BaseMapper" (no generics), it remains unchanged (backward compatible)
   • If you specify rootInterface="BaseMapper<com.example.User>" (fully qualified), it's used as-is

Example Usage:

<javaClientGenerator targetPackage="com.example.mapper" targetProject="src/main/java" type="XMLMAPPER">
    <property name="rootInterface" value="com.mycompany.BaseMapper&lt;T&gt;"/>
</javaClientGenerator>

This will generate mapper interfaces like:

public interface UserMapper extends BaseMapper<User> {
    // ...
}

Resolves

Closes #1346 - Feature Request : Generics support in javaClientGenerator rootInterface

The implementation is backward compatible and passes all linter checks.
Ready for testing and review.

Contribution by Gittensor, learn more at https://gittensor.io/

[OxLeOx]

want your review @hazendaz