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Simple and easy validations for Scala and Java

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package com.github.vickumar1981.svalidate.util.example.model;

import com.github.vickumar1981.svalidate.util.Validation;

import java.util.Optional;

import static com.github.vickumar1981.svalidate.util.ValidationSyntax.orElse;
import static com.github.vickumar1981.svalidate.util.ValidationSyntax.errorIfEmpty;
import static com.github.vickumar1981.svalidate.util.ValidationSyntax.errorIfDefined;
import static com.github.vickumar1981.svalidate.util.ValidationSyntax.maybeValidate;

public class Person implements Validatable {
    private String firstName;
    private String lastName;
    private Boolean hasContactInfo;
    private Optional address;
    private Optional phone;

    public Person(String firstName,
                  String lastName,
                  Boolean hasContactInfo,
                  Optional address,
                  Optional phone) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.hasContactInfo = hasContactInfo;
        this.address = address;
        this.phone = phone;
    }

    private Validation validateContactInfo() {
        return Validation.of(
            errorIfEmpty("Address is required").apply(address),
            errorIfEmpty("Phone # is required").apply(phone),
            maybeValidate(address),
            maybeValidate(phone.map(p -> p.matches("\\d{10}")),
                    orElse("Phone # must be 10 digits"))
        );
    }

    @Override
    public Validation validate() {
        return Validation.of(
            orElse("First name is required").apply(
                    firstName != null && !firstName.isEmpty())    ,
            orElse("Last name is required").apply(
                    lastName != null && !lastName.isEmpty())
        )
        .andThen(hasContactInfo, this::validateContactInfo)
        .orElse(hasContactInfo, () ->
                errorIfDefined("Address must be empty").apply(address)
                        .append(errorIfDefined("Phone # must be empty").apply(phone))
        );
    }
}