自定义 Lombok 生成的 Builder

Question

我已经用构建器定义了一个 class，现在我想使用 Lombok 的 @Builder 注释来限制样板代码。

public class ClientApp {

    private UUID clientId;

    ClientApp(UUID clientId) {
      this.clientId = clientId;
    }

    public static Builder builder() {
      return new Builder();
    }

    public static class Builder {

      private UUID clientId;

      public Builder clientId(String clientId) {
        return clientId(UUID.fromString(clientId));
      }

      public Builder clientId(UUID clientId) {
        this.clientId = clientId;
        return this;
      }

      public ClientApp build() {
        return new ClientApp(this.clientId);
      }
    }

    public Builder clientId(String clientId) {
        return clientId(UUID.fromString(clientId));
    }
}

但是，注解不会生成clientId(String)方法，只会生成clientId(UUID)。如何使用 Lombok 生成它？

Answer 1

好吧，lombok 不会为你生成这个，但你可以使用 @Builder 并有一个 ClientAppBuilder class 包含一个接受字符串并将其路由到另一个方法的方法，即生成, 方法.可能您需要使用@Tolerate 标记您的方法，否则Lombok 将不会生成UUID 接受方法。

披露：我是 Lombok 开发人员。

Answer 2

我无法使用 @Tolerate 方法（我可能做错了）。

     /**
     * Fails with The method clientId(String) in the type So33943193.ClientApp.ClientAppBuilder is not applicable
     * for the arguments (UUID)
     */
    public static class ClientAppBuilder {

        @Tolerate
        public ClientAppBuilder clientId(String clientId) {
            return this.clientId(UUID.fromString(clientId));
        }
    }

但是，如果您使用的是 java8，则可以解决以下事实：在使用具有默认方法的接口生成构建器方法时，lombok 仅匹配方法名称而不匹配整个签名。

package lombok.javac.handlers.Whosebug;

import static org.junit.Assert.*;

import java.util.UUID;

import lombok.Builder;
import lombok.Value;

import org.junit.Test;

public class So33943193 {

    /**
     * The Interface WithClientUUID.
     *
     * @param <BLDR> the builder type
     */
    public static interface WithClientUUID<BLDR extends WithClientUUID<BLDR>> {

        /**
         * Client id.
         *
         * @param clientId the client id
         * @return the bldr
         */
        default BLDR clientId(String clientId) {
            return this.clientId(UUID.fromString(clientId));
        }

        /**
         * Client id.
         *
         * @param clientId the client id
         * @return the bldr
         */
        BLDR clientId(UUID clientId);

    }

    /**
     * The Class ClientApp.
     */
    @Builder(toBuilder = true)
    @Value
    public static class ClientApp {

        /** The client id. */
        private final UUID clientId;

        /**
         * Instantiates a new client app.
         *
         * @param clientId the client id
         */
        ClientApp(UUID clientId) {
            this.clientId = clientId;
        }

        /**
         * Implement the builder and extend the interface.
         */
        public static class ClientAppBuilder implements WithClientUUID<ClientAppBuilder> {}

    }

    /**
     * Test all scenarios
     */
    @Test
    public void testClientApp() {
        UUID expected = UUID.randomUUID();
        final ClientApp fromUuid = ClientApp.builder()
            .clientId(expected)
            .build();
        final ClientApp fromString = ClientApp.builder()
            .clientId(expected.toString())
            .build();
        assertEquals(expected, fromUuid.getClientId());
        assertEquals(expected, fromString.getClientId());

    }
}

自定义 Lombok 生成的 Builder

Customizing Builder generated by Lombok

java

lombok