using ClaimBuilder with CRTP

ReadyToOpenClaimBuilder.java

// imports elided...

public class ReadyToOpenClaimBuilder extends ClaimBuilder<ReadyToOpenClaimBuilder> {

    private Company company;

    private ReadyToOpenClaimBuilder() {
        super();
    }

    public static ReadyToOpenClaimBuilder aClaimReadyToOpen() {
        ReadyToOpenClaimBuilder builder = new ReadyToOpenClaimBuilder();
        builder.withStatus(ClaimStatus.ReadyToOpen);
        return builder;
    }

    public ReadyToOpenClaimBuilder withCompany(Company company) {
        Objects.requireNonNull(company, "Company must not be null");
        this.company = company;
        return this;
    }

    public Claim build() {
        return new ReadyToOpenClaim(
                buildData(),
                company
        );
    }
}