mServer.crawler.sender.orf.parser.OrfEpisodeDeserializer Maven / Gradle / Ivy

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package mServer.crawler.sender.orf.parser;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import java.lang.reflect.Type;
import java.time.Duration;
import java.util.Optional;
import mServer.crawler.sender.orf.JsonUtils;
import mServer.crawler.sender.orf.OrfEpisodeInfoDTO;
import mServer.crawler.sender.orf.OrfVideoInfoDTO;

public class OrfEpisodeDeserializer implements JsonDeserializer> {

  private static final String ELEMENT_VIDEO = "video";

  private static final String ATTRIBUTE_TITLE = "title";
  private static final String ATTRIBUTE_DESCRIPTION = "description";
  private static final String ATTRIBUTE_DURATION = "duration";

  @Override
  public Optional deserialize(JsonElement aJsonElement, Type aType, JsonDeserializationContext aContext) throws JsonParseException {

    if (!aJsonElement.getAsJsonObject().has(ELEMENT_VIDEO)) {
      return Optional.empty();
    }

    JsonObject videoObject = aJsonElement.getAsJsonObject().get(ELEMENT_VIDEO).getAsJsonObject();
    final Optional title = JsonUtils.getAttributeAsString(videoObject, ATTRIBUTE_TITLE);
    final Optional description = JsonUtils.getAttributeAsString(videoObject, ATTRIBUTE_DESCRIPTION);
    final Optional duration = parseDuration(videoObject);

    final Optional videoInfoOptional = parseUrls(videoObject);

    if (videoInfoOptional.isPresent()) {
      OrfEpisodeInfoDTO episode = new OrfEpisodeInfoDTO(videoInfoOptional.get(), title, description, duration);
      return Optional.of(episode);
    }

    return Optional.empty();
  }

  private Optional parseUrls(final JsonObject aVideoObject) {

    OrfVideoDetailDeserializer deserializer = new OrfVideoDetailDeserializer();
    return deserializer.deserializeVideoObject(aVideoObject);
  }

  private static Optional parseDuration(final JsonObject aVideoObject) {
    if (aVideoObject.has(ATTRIBUTE_DURATION)) {
      Long durationValue = aVideoObject.get(ATTRIBUTE_DURATION).getAsLong();

      // Duration ist in Millisekunden angegeben, diese interessieren aber nicht
      return Optional.of(Duration.ofSeconds(durationValue / 1000));
    }

    return Optional.empty();
  }
}