9D3.RW-Separation Dto

In Wings, to protect data and prevent method leak, the incoming Dto should be read-only.

Getter and Builder

@Getter @Builder
@ToString @EqualsAndHashCode
public class RwsDto {
    private Long id;
    private String name;
}

The simplest separation strategy, with lombok power, and very clean code.

RwsDto p = RwsDto.builder()
                 .id(1L)
                 .name("name")
                 .build();

Builder Plugin

@Getter
@ToString @EqualsAndHashCode
public final class RwsDto {
    private final Long id;
    private final String name;
    // Alt + Insert > Builder
}

In IDEA use InnerBuilder, and check the following options,

• Generate builder methods for final fields
• Generate static newBuilder()method
• Rename newBuilder()to builder()
• Generate builder copy constructor

In comparison to lombok, you can add your own code in the generated builder method.

Manual Inheritance

Builder pattern, mainly final + same field assignment pattern, the following is the inheritance way.

@Getter
@ToString @EqualsAndHashCode
public class RwsDto {
    protected Long id;
    protected String name;

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

    public static class Builder extends RwsDto {
        public Builder() {
            // int the fixed values
        }

        public Builder id(Long id){
            Objects.requireNonNull(id);
            super.id = id;
            return this;
        }
        public Builder name(String name){
            super.name = name;
            return this;
        }

        public RwsDto build(){
            return this;
        }
    }
}