Base Class of DataSearchValidator to validate FieldExpressions according to their field path.

Example:

Let's assume the following model:

@Entity
class Person(
    ...
    @Column(unique = true, length = 100)
    val email: String? = null,
    ...
    @OneToOne(mappedBy = "person", cascade = [CascadeType.ALL], orphanRemoval = true)
    @JsonIgnoreProperties("person")
    val jobEntity: Job? = null,
    ...
)

@Entity
class Job(
    ...
    @Column(unique = true, length = 100)
    val email: String? = null,
    ...
)

Let's assume a Validator to validate Person email and Job email.

This validator should be instantiated with the different field paths, and added to a SearchDescriptor:

fun personSearchDescriptor(): SearchDescriptor<Person> = SearchDescriptorBuilder.builder<Person>()
         .validators(EmailValidator("email", "job.email"))
         .build()