Java tutorial
package br.com.catbag.gifreduxsample.models; /** Copyright 26/10/2016 Felipe Pieiro (fpbitencourt@gmail.com), Nilton Vasques (nilton.vasques@gmail.com) and Raul Abreu (raulccabreu@gmail.com) Be free to ask for help, email us! Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. **/ import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.annotation.JsonDeserialize; import com.fasterxml.jackson.databind.annotation.JsonSerialize; import org.immutables.value.Value; import java.io.IOException; @SuppressWarnings("PMD.BooleanGetMethodName") @Value.Immutable @JsonSerialize(as = ImmutableGif.class) @JsonDeserialize(as = ImmutableGif.class) public abstract class Gif { public enum Status { PAUSED, LOOPING, DOWNLOADING, DOWNLOADED, NOT_DOWNLOADED, DOWNLOAD_FAILED } //abstract method are immutable by default public abstract String getUuid(); @Value.Default public String getPath() { return ""; } public abstract String getUrl(); public abstract String getTitle(); @Value.Default public boolean getWatched() { return false; } @Value.Default public Status getStatus() { return Status.NOT_DOWNLOADED; } public String toJson() throws JsonProcessingException { return new ObjectMapper().writeValueAsString(this); } public static Gif fromJson(String json) throws IOException { return new ObjectMapper().readValue(json, Gif.class); } }