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Core data-binding logic used by YOJ (YDB ORM for Java) to convert between Java objects and database rows (or anything representable by a Java Map, really).

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package tech.ydb.yoj.databind.expression.values;

import lombok.NonNull;
import tech.ydb.yoj.databind.FieldValueType;
import tech.ydb.yoj.databind.expression.IllegalExpressionException.FieldTypeError.UuidFieldExpected;

import java.lang.reflect.Type;
import java.util.Optional;
import java.util.UUID;

import static java.lang.String.format;
import static tech.ydb.yoj.databind.expression.values.FieldValue.ValidationResult.invalidFieldValue;
import static tech.ydb.yoj.databind.expression.values.FieldValue.ValidationResult.validFieldValue;

public record UuidFieldValue(@NonNull UUID uuid) implements FieldValue {
    @Override
    public Optional> getComparableByType(Type fieldType, FieldValueType valueType) {
        return switch (valueType) {
            case UUID, STRING -> Optional.of(uuid.toString());
            default -> Optional.empty();
        };
    }

    @Override
    public ValidationResult isValidValueOfType(Type fieldType, FieldValueType valueType) {
        return valueType == FieldValueType.UUID || valueType == FieldValueType.STRING
                ? validFieldValue() // All UUIDs are representable as both UUID and String
                : invalidFieldValue(UuidFieldExpected::new, p -> format("Specified an UUID value for non-UUID/non-String field \"%s\"", p));
    }

    @Override
    public String toString() {
        return uuid.toString();
    }
}