Lombok 构建器包范围

Question

我想使用 Lombok, but I'm not sure if it's possible (I didn't find any clues in documentation).

生成 package-scope 生成器

Lombok 默认生成 public 构建器，即此代码：

@Builder
class User {

    private final String name;
}

翻译成这样：

class User {
    private final String name;

    User(final String name) {
        this.name = name;
    }

    public static User.UserBuilder builder() { // <-- how to make it package-private?
        return new User.UserBuilder();
    }

    public static class UserBuilder { // <-- how to make it package-private?
        private String name;

        UserBuilder() {
        }

        public User.UserBuilder name(final String name) {
            this.name = name;
            return this;
        }

        public User build() {
            return new User(this.name);
        }

        public String toString() {
            return "User.UserBuilder(name=" + this.name + ")";
        }
    }
}

没有这个前导 public 关键字，有什么方法可以生成生成器 class 吗？

Answer 1

查看 @Builder documentation 中的以下内容：

@Builder(access = AccessLevel.PACKAGE) is legal (and will generate the builder class, the builder method, etc with the indicated access level) starting with lombok v1.18.8

如果您查看 Builder here 的源代码，您会看到默认情况下 @Builder 的访问级别为 lombok.AccessLevel.PUBLIC，但可以package-private 与 @Builder(access = AccessLevel.PACKAGE).

此外，仅供参考，@Builder 支持以下访问级别：PUBLIC, MODULE, PROTECTED, PACKAGE, PRIVATE。这是通过 AccessLevel 枚举的源代码 here.

Lombok 构建器包范围

Lombok builder package scope

java

builder

access-modifiers

lombok

package-private