AutoJackson
Why AutoValue is awesome?
Just read Google's explanation!
TLTR: It gives you immutability (thread safety!), equals(), hashCode() and toString() for free!
Okay, I'm in, show me the code!
Simple example of class annotated with AutoValue or AutoParcel + Jackson.
It is serializable to JSON and deserializable from JSON, it's immutable and it has correctly implemented equals(), hashCode() and toString()! Life is better with AutoValue!
// Just use @AutoParcel annotations if you need AutoParcel @AutoValue @JsonDeserialize(builder = AutoValue_Tweet.Builder.class) public abstract class Tweet {
@NotNull
public static Builder builder() {
return new AutoValue_Tweet.Builder();
}
@NotNull
@JsonProperty("author")
public abstract String author();
@NotNull
@JsonProperty("content")
public abstract String content();
@AutoValue.Builder
public static abstract class Builder {
@NotNull
@JsonProperty("author")
public abstract Builder author(@NotNull String author);
@NotNull
@JsonProperty("content")
public abstract Builder content(@NotNull String content);
@NotNull
public abstract Tweet build();
}
}
Serialization and deserialization:
@Test public void shouldSerializeToJson() throws JsonProcessingException {
ObjectMapper objectMapper = new ObjectMapper();
Tweet tweet = Tweet.builder()
.author("@artem_zin")
.content("Immutability for everybody!")
.build();
assertThatJson(objectMapper.writeValueAsString(tweet))
.isEqualTo("{
\"author\":\"@artem_zin\",\"content\":\"Immutability for everybody!\"
}
");
}
@Test public void shouldDeserializeFromJson() throws IOException {
ObjectMapper objectMapper = new ObjectMapper();
String json = "{
\"author\":\"@artem_zin\",\"content\":\"Immutability for everybody!\"
}
";
Tweet tweet = objectMapper.readValue(json, Tweet.class);
assertThat(tweet.author()).isEqualTo("@artem_zin");
assertThat(tweet.content()).isEqualTo("Immutability for everybody!");
}
Build the project
Run sh ci.sh.