Java tutorial
/* * 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 * * 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.facebook.serializer; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.node.ObjectNode; import com.google.common.base.Joiner; import com.google.common.base.Optional; import com.google.common.collect.Lists; import com.google.common.collect.Maps; import org.apache.streams.exceptions.ActivitySerializerException; import org.apache.streams.facebook.Cover; import org.apache.streams.facebook.Datum; import org.apache.streams.facebook.Location; import org.apache.streams.facebook.Page; import org.apache.streams.facebook.Place; import org.apache.streams.facebook.Post; import org.apache.streams.facebook.To; import org.apache.streams.jackson.StreamsJacksonMapper; import org.apache.streams.pojo.extensions.ExtensionUtil; import org.apache.streams.pojo.json.Activity; import org.apache.streams.pojo.json.ActivityObject; import org.apache.streams.pojo.json.Actor; import org.apache.streams.pojo.json.Image; import org.apache.streams.pojo.json.Provider; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.util.HashMap; import java.util.List; import java.util.Map; import static org.apache.streams.data.util.ActivityUtil.*; public class FacebookActivityUtil { private static final Logger LOGGER = LoggerFactory.getLogger(FacebookActivityUtil.class); /** * Updates the given Activity object with the values from the Page * @param page the object to use as the source * @param activity the target of the updates. Will receive all values from the Page. * @throws org.apache.streams.exceptions.ActivitySerializerException */ public static void updateActivity(Page page, Activity activity) throws ActivitySerializerException { activity.setActor(buildActor(page)); activity.setId(null); activity.setProvider(getProvider()); } /** * Updates the given Activity object with the values from the Post * @param post * @param activity * @throws ActivitySerializerException */ public static void updateActivity(Post post, Activity activity) throws ActivitySerializerException { activity.setActor(buildActor(post)); activity.setId(formatId(post.getId())); activity.setProvider(getProvider()); activity.setUpdated(post.getUpdatedTime()); activity.setPublished(post.getCreatedTime()); if (post.getLink() != null && post.getLink().length() > 0) { List<String> links = Lists.newArrayList(); links.add(post.getLink()); activity.setLinks(links); } activity.setContent(post.getMessage()); activity.setVerb("post"); activity.setObject(buildObject(post)); buildExtensions(activity, post); } /** * Builds out the {@link org.apache.streams.pojo.json.ActivityObject} from the given {@link org.apache.streams.pojo.json.Post} * @param post * @return {@link org.apache.streams.pojo.json.ActivityObject} */ public static ActivityObject buildObject(Post post) { ActivityObject activityObject = new ActivityObject(); try { activityObject.setContent(post.getMessage()); activityObject.setPublished(post.getCreatedTime()); activityObject.setUpdated(post.getUpdatedTime()); activityObject.setDisplayName(post.getFrom().getName()); activityObject.setId(formatId(post.getId())); activityObject.setObjectType(post.getType()); activityObject.setUrl(post.getLink()); if (activityObject.getObjectType().equals("photo")) { Image image = new Image(); image.setUrl(activityObject.getUrl()); activityObject.setImage(image); } } catch (Exception e) { LOGGER.error("Exception while trying to build Activity object for post: {}, exception: {}", post, e); } return activityObject; } /** * Gets the common facebook {@link org.apache.streams.pojo.json.Provider} object * @return a provider object representing Facebook */ public static Provider getProvider() { Provider provider = new Provider(); provider.setId("id:providers:facebook"); provider.setDisplayName("Facebook"); return provider; } /** * Builds the activity {@link org.apache.streams.pojo.json.Actor} object from the Page * @param page the object to use as the source * @return a valid Actor populated from the Page */ public static Actor buildActor(Page page) { Actor actor = new Actor(); actor.setId( formatId(Optional.fromNullable(page.getId()).or(Optional.of(page.getId().toString())).orNull())); actor.setDisplayName(page.getName()); actor.setAdditionalProperty("handle", page.getUsername()); actor.setSummary(page.getAbout()); if (page.getLink() != null) { actor.setUrl(page.getLink()); } Image profileImage = new Image(); Cover cover = page.getCover(); if (cover != null) profileImage.setUrl(cover.getSource()); actor.setImage(profileImage); buildExtensions(actor, page); return actor; } /** * Builds an {@link org.apache.streams.pojo.json.Actor} object from the {@link org.apache.streams.pojo.json.Post} * @param post * @return {@link org.apache.streams.pojo.json.Actor} */ public static Actor buildActor(Post post) { Actor actor = new Actor(); try { actor.setId(formatId(Optional.fromNullable(post.getFrom().getId()) .or(Optional.of(post.getFrom().getId().toString())).orNull())); actor.setDisplayName(post.getFrom().getName()); actor.setAdditionalProperty("handle", post.getFrom().getName()); } catch (Exception e) { LOGGER.error("Exception trying to build actor for Post: {}, {}", post, e); } return actor; } /** * Builds the actor extensions given the page object * @param actor * @param page */ public static void buildExtensions(Actor actor, Page page) { Map<String, Object> extensions = new HashMap<String, Object>(); Location location = page.getLocation(); if (location != null) extensions.put("location", page.getLocation().toString()); extensions.put("favorites", page.getLikes()); extensions.put("followers", page.getTalkingAboutCount()); extensions.put("screenName", page.getUsername()); actor.setAdditionalProperty("extensions", extensions); } /** * Fills out the extensions attribute of the passed in {@link org.apache.streams.pojo.json.Activity} * @param activity * @param post */ public static void buildExtensions(Activity activity, Post post) { ObjectMapper mapper = StreamsJacksonMapper.getInstance(); Map<String, Object> extensions = ExtensionUtil.ensureExtensions(activity); if (post.getLikes() != null && post.getLikes().size() > 0) { Map<String, Object> likes = Maps.newHashMap(); org.apache.streams.facebook.Like like = post.getLikes().get(0); if (like.getAdditionalProperties().containsKey("data")) { extensions.put("likes", likes); } } if (post.getShares() != null) { Map<String, Object> shares = Maps.newHashMap(); shares.put("count", ((Map<String, Object>) post.getShares()).get("count")); extensions.put("rebroadcasts", shares); } if (post.getTo() != null) { To to = post.getTo(); List<Datum> data = to.getData(); extensions.put("user_mentions", Lists.newArrayList()); for (Datum d : data) { Map<String, String> mention = Maps.newHashMap(); mention.put("id", d.getId()); mention.put("displayName", d.getName()); mention.put("handle", d.getName()); ((List<Map<String, String>>) extensions.get("user_mentions")).add(mention); } } if (post.getPlace() != null) { Place place = post.getPlace(); if (place.getAdditionalProperties().containsKey("location")) { extensions.put(LOCATION_EXTENSION, place.getAdditionalProperties().get("location")); } } extensions.put("facebook", mapper.convertValue(post, ObjectNode.class)); } /** * Formats the ID to conform with the Apache Streams activity ID convention * @param idparts the parts of the ID to join * @return a valid Activity ID in format "id:facebook:part1:part2:...partN" */ public static String formatId(String... idparts) { return Joiner.on(":").join(Lists.asList("id:facebook", idparts)); } }