CodefValidator.java

package io.codef.api;

import io.codef.api.error.CodefError;
import io.codef.api.error.CodefException;
import java.util.Optional;
import java.util.UUID;

public class CodefValidator {

    private CodefValidator() {
    }

    public static <T> T requireNonNullElseThrow(
        T object,
        CodefError codefError
    ) {
        return Optional.ofNullable(object)
            .orElseThrow(() -> CodefException.from(codefError));
    }

    public static void requireValidUUIDPattern(
        String uuid,
        CodefError codefError
    ) {
        final String UUID_REGULAR_EXPRESSION = "^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$";

        Optional.ofNullable(uuid)
            .filter(uuids -> uuids.matches(UUID_REGULAR_EXPRESSION))
            .map(UUID::fromString)
            .orElseThrow(() -> CodefException.from(codefError));
    }
}