如何使用Hibernate for Java将CHAR(1)映射到布尔值？

import org.hibernate.type.descriptor.WrapperOptions;
import org.hibernate.type.descriptor.java.AbstractSingleColumnStandardBasicTypeDescriptor;
import org.hibernate.type.descriptor.java.BooleanTypeDescriptor;
import org.hibernate.type.descriptor.sql.CharTypeDescriptor;

public class BooleanToCharTypeDescriptor extends AbstractSingleColumnStandardBasicTypeDescriptor<Boolean> {

    public static final BooleanToCharTypeDescriptor INSTANCE = new BooleanToCharTypeDescriptor();

    public BooleanToCharTypeDescriptor() {
        super(CharTypeDescriptor.INSTANCE, BooleanToCharTypeDescriptor.BooleanToCharTransformer.INSTANCE);
    }

    @Override
    public String getName() {
        return "boolean_to_char";
    }

    @Override
    protected Boolean stringToObject(String xml) {
        return fromString(xml);
    }

    @Override
    protected <X> X unwrap(Boolean value, Class<X> type, WrapperOptions options) {
        if (value == null) {
            return null;
        }
        if (Boolean.class.isAssignableFrom(type)) {
            return (X) Boolean.valueOf(value);
        }
        if (String.class.isAssignableFrom(type)) {
            return (X) toString(value);
        }
        throw unknownUnwrap(type);
    }

    @Override
    protected <X> Boolean wrap(X value, WrapperOptions options) {
        if (value == null) {
            return null;
        }
        if (Boolean.class.isInstance(value)) {
            return (Boolean) value;
        }
        if (String.class.isInstance(value)) {
            return fromString((String) value);
        }
        throw unknownWrap(value.getClass());
    }

    protected Boolean fromString(String xml) {
        return xml.equals("1") || xml.equalsIgnoreCase("true");
    }

    protected String toString(Boolean value) {
        return value ? "1" : "0";
    }

    public static class BooleanToCharTransformer extends AbstractSingleColumnStandardBasicTypeDescriptor.AbstractBooleanTransformer<Character> {

        public static final BooleanToCharTransformer INSTANCE = new BooleanToCharTransformer();

        @Override
        public Character fromNonNullString(String s) {
            return s.charAt(0);
        }

        @Override
        public String toNonNullString(Character value) {
            return Character.toString(value);
        }
    }
}

   <class name="com.example.MyEntity" table="my_entity">
       <property name="isActive" column="is_active" type="boolean-to-char" />
    </class>
</hibernate-mapping>

public class MyEntity {
    // ...
    private Boolean isActive;
    // ...

    public Boolean getIsActive() {
        return isActive;
    }

    public void setIsActive(Boolean isActive) {
        this.isActive = isActive;
    }
}