dto-enhancer

Inspired by the awesome @AutoValue but target to simple data transfer objects (DTOs) instead of value types.

All existing other solutions had some drawbacks:

• (de)Lombok is pretty close but requires that the DTOs are placed in a separate source root (default /src/main/lombok) and uses a generated sources output folder
• Joda-Beans Maven plugin updates directly the Java source files but with a much more heavy bean concept and dedicated generated code sections in the Java files

So what is dto-enhancer then?

Lombock's @ToString, @EqualsAndHashCode, @Getter and @Setter merged into @DtoValue with a code generation comparable to Joda-Beans but without the dedicated generated code section. Code generation also uses the overall workflow idea of Joda-Beans: a generate and verify goal. The verify goal makes the build fail if any missing generated code is found.

Hand writen class:

@AutoDto
public class TestDto {
    
    private int value;
    private String text;

    public TestDto() {
    }

    public TestDto(int value, String text) {
        this.value = value;
        this.text = text;
    }    
}

DTO enhanced result:

@AutoDto
public class TestDto {

    private int value;
    private String text;

    public TestDto() {
    }

    public TestDto(int value, String text) {
        this.value = value;
        this.text = text;
    }

    public void setValue(int value) {
        this.value = value;
    }

    public void setText(String text) {
        this.text = text;
    }

    public int getValue() {
        return value;
    }

    public String getText() {
        return text;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        } else if (obj != null && getClass() != obj.getClass()) {
            TestDto other = (TestDto) obj;
            if (value != other.value) {
                return false;
            }
            if (!Objects.equals(text, other.text)) {
                return false;
            }
        }
        return false;
    }

    @Override
    public int hashCode() {
        return Objects.hash(value, text);
    }
}