// Programmatic mapping API
//
// Version ignoring the annotation parameters
// The lambda file type is inferred from addConstraintImplementor class parameter
mapping
    .addConstraintImplementor(IsFile.class).validating( (file) -> file.isFile() );

// Version using annotation parameters
// The lambda annotation type is inferred from addConstraintImplementor class parameter
mapping
    .addConstraintImplementor(CheckFileType.class)
    .validating( (annotation, file) -> annotation.isFile() && file.isFile() );