GPlusActivityDeserializer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

package org.apache.streams.gplus.serializer.util;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.google.api.client.util.DateTime;
import com.google.api.services.plus.model.Activity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * Custom deserializer for GooglePlus' Person model.
 */
public class GPlusActivityDeserializer extends JsonDeserializer<Activity> {

  private static final Logger LOGGER = LoggerFactory.getLogger(GPlusActivityDeserializer.class);

  /**
   * Because the GooglePlus Activity object {@link com.google.api.services.plus.model.Activity} contains complex objects
   * within its hierarchy, we have to use a custom deserializer
   *
   * @param jsonParser jsonParser
   * @param deserializationContext deserializationContext
   * @return The deserialized {@link com.google.api.services.plus.model.Activity} object
   * @throws IOException IOException
   * @throws JsonProcessingException JsonProcessingException
   */
  @Override
  public Activity deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {

    JsonNode node = jsonParser.getCodec().readTree(jsonParser);
    Activity activity = new Activity();

    try {
      activity.setUrl(node.get("url").asText());
      activity.setEtag(node.get("etag").asText());
      activity.setTitle(node.get("title").asText());
      activity.setPublished(DateTime.parseRfc3339(node.get("published").asText()));
      activity.setUpdated(DateTime.parseRfc3339(node.get("updated").asText()));
      activity.setId(node.get("id").asText());
      activity.setVerb(node.get("verb").asText());

      activity.setActor(buildActor(node));

      activity.setObject(buildPlusObject(node));
    } catch (Exception ex) {
      LOGGER.error("Exception while trying to deserialize activity object: {}", ex);
    }

    return activity;
  }

  /**
   * Given a raw JsonNode, build out the G+ {@link com.google.api.services.plus.model.Activity.Actor} object
   *
   * @param node node
   * @return {@link com.google.api.services.plus.model.Activity.Actor} object
   */
  private Activity.Actor buildActor(JsonNode node) {
    Activity.Actor actor = new Activity.Actor();
    JsonNode actorNode = node.get("actor");

    actor.setId(actorNode.get("id").asText());
    actor.setDisplayName(actorNode.get("displayName").asText());
    actor.setUrl(actorNode.get("url").asText());

    Activity.Actor.Image image = new Activity.Actor.Image();
    JsonNode imageNode = actorNode.get("image");
    image.setUrl(imageNode.get("url").asText());

    actor.setImage(image);

    return actor;
  }

  /**
   * Given a JsonNode, build out all aspects of the {@link com.google.api.services.plus.model.Activity.PlusObject} object
   *
   * @param node node
   * @return {@link com.google.api.services.plus.model.Activity.PlusObject} object
   */
  private Activity.PlusObject buildPlusObject(JsonNode node) {
    Activity.PlusObject object = new Activity.PlusObject();
    JsonNode objectNode = node.get("object");
    object.setObjectType(objectNode.get("objectType").asText());
    object.setContent(objectNode.get("content").asText());
    object.setUrl(objectNode.get("url").asText());

    Activity.PlusObject.Replies replies = new Activity.PlusObject.Replies();
    JsonNode repliesNode = objectNode.get("replies");
    replies.setTotalItems(repliesNode.get("totalItems").asLong());
    replies.setSelfLink(repliesNode.get("selfLink").asText());
    object.setReplies(replies);

    Activity.PlusObject.Plusoners plusoners = new Activity.PlusObject.Plusoners();
    JsonNode plusonersNode = objectNode.get("plusoners");
    plusoners.setTotalItems(plusonersNode.get("totalItems").asLong());
    plusoners.setSelfLink(plusonersNode.get("selfLink").asText());
    object.setPlusoners(plusoners);

    Activity.PlusObject.Resharers resharers = new Activity.PlusObject.Resharers();
    JsonNode resharersNode = objectNode.get("resharers");
    resharers.setTotalItems(resharersNode.get("totalItems").asLong());
    resharers.setSelfLink(resharersNode.get("selfLink").asText());
    object.setResharers(resharers);

    object.setAttachments(buildAttachments(objectNode));//attachments);

    return object;
  }

  /**
   * Given a raw JsonNode representation of an Activity's attachments, build out that
   * list of {@link com.google.api.services.plus.model.Activity.PlusObject.Attachments} objects
   *
   * @param objectNode objectNode
   * @return list of {@link com.google.api.services.plus.model.Activity.PlusObject.Attachments} objects
   */
  private List<Activity.PlusObject.Attachments> buildAttachments(JsonNode objectNode) {
    List<Activity.PlusObject.Attachments> attachments = new ArrayList<>();
    if ( objectNode.has("attachments") ) {
      for (JsonNode attachmentNode : objectNode.get("attachments")) {
        Activity.PlusObject.Attachments attachments1 = new Activity.PlusObject.Attachments();
        attachments1.setObjectType(attachmentNode.get("objectType").asText());
        if (attachmentNode.has("displayName")) {
          attachments1.setDisplayName(attachmentNode.get("displayName").asText());
        }
        if (attachmentNode.has("content")) {
          attachments1.setContent(attachmentNode.get("content").asText());
        }
        if (attachmentNode.has("url")) {
          attachments1.setUrl(attachmentNode.get("url").asText());
        }

        if( attachmentNode.has("image")) {
          Activity.PlusObject.Attachments.Image image1 = new Activity.PlusObject.Attachments.Image();
          JsonNode imageNode1 = attachmentNode.get("image");
          image1.setUrl(imageNode1.get("url").asText());
          attachments1.setImage(image1);
        }

        attachments.add(attachments1);
      }
    }
    return attachments;
  }
}