Java tutorial
/* * #%L * ACS AEM Commons Twitter Support Bundle * %% * Copyright (C) 2013 - 2014 Adobe * %% * 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. * #L% */ package com.adobe.acs.commons.twitter.impl; import java.util.ArrayList; import java.util.Dictionary; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import javax.jcr.Session; import org.apache.commons.lang.StringUtils; import org.apache.felix.scr.annotations.Component; import org.apache.felix.scr.annotations.Property; import org.apache.felix.scr.annotations.PropertyUnbounded; import org.apache.felix.scr.annotations.Reference; import org.apache.felix.scr.annotations.Service; import org.apache.sling.api.resource.ModifiableValueMap; import org.apache.sling.api.resource.PersistenceException; import org.apache.sling.api.resource.Resource; import org.apache.sling.api.resource.ResourceResolver; import org.apache.sling.api.resource.ResourceUtil; import org.apache.sling.api.resource.ValueMap; import org.apache.sling.commons.osgi.PropertiesUtil; import org.osgi.service.component.ComponentContext; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import twitter4j.Status; import twitter4j.Twitter; import twitter4j.TwitterException; import twitter4j.URLEntity; import com.day.cq.replication.ReplicationActionType; import com.day.cq.replication.ReplicationException; import com.day.cq.replication.Replicator; import com.day.cq.search.PredicateGroup; import com.day.cq.search.Query; import com.day.cq.search.QueryBuilder; import com.day.cq.search.result.SearchResult; import com.day.cq.wcm.api.Page; import com.day.cq.wcm.api.PageManager; @Component(immediate = true, label = "ACS AEM Commons - Twitter Feed Update Service", metatype = true, description = "Service to update Twitter Feed components.") @Service public final class TwitterFeedUpdaterImpl implements TwitterFeedUpdater { private static final Logger log = LoggerFactory.getLogger(TwitterFeedUpdaterImpl.class); @Reference private Replicator replicator; @Property(value = "acs-commons/components/content/twitter-feed", unbounded = PropertyUnbounded.ARRAY, label = "Twitter Feed component paths", description = "Component paths for Twitter Feed components.") private static final String TWITTER_COMPONENT_PATHS = "twitter.component.paths"; private String[] twitterComponentPaths = null; protected void activate(ComponentContext ctx) { final Dictionary<?, ?> props = ctx.getProperties(); twitterComponentPaths = PropertiesUtil.toStringArray(props.get(TWITTER_COMPONENT_PATHS)); } @Override public void updateTwitterFeedComponents(ResourceResolver resourceResolver) { PageManager pageManager = resourceResolver.adaptTo(PageManager.class); List<Resource> twitterResources = findTwitterResources(resourceResolver); for (Resource twitterResource : twitterResources) { Page page = pageManager.getContainingPage(twitterResource); if (page != null) { Twitter client = page.adaptTo(Twitter.class); if (client != null) { try { ValueMap properties = ResourceUtil.getValueMap(twitterResource); String username = properties.get("username", String.class); if (!StringUtils.isEmpty(username)) { log.info("Loading Twitter timeline for user {} for component {}.", username, twitterResource.getPath()); List<Status> statuses = client.getUserTimeline(username); if (statuses != null) { List<String> tweetsList = new ArrayList<String>(statuses.size()); for (Status status : statuses) { tweetsList.add(processTweet(status)); } if (tweetsList.size() > 0) { ModifiableValueMap map = twitterResource.adaptTo(ModifiableValueMap.class); map.put("tweets", tweetsList.toArray(new String[tweetsList.size()])); twitterResource.getResourceResolver().commit(); handleReplication(pageManager, twitterResource); } } } } catch (PersistenceException e) { log.error("Exception while updating twitter feed on resource:" + twitterResource.getPath(), e); } catch (ReplicationException e) { log.error( "Exception while replicating twitter feed on resource:" + twitterResource.getPath(), e); } catch (TwitterException e) { log.error("Exception while loading twitter feed on resource:" + twitterResource.getPath(), e); } } } } } private List<Resource> findTwitterResources(ResourceResolver resourceResolver) { List<Resource> twitterResources = new ArrayList<Resource>(); Map<String, String> predicateMap = new HashMap<String, String>(); predicateMap.put("path", "/content"); predicateMap.put("property", "sling:resourceType"); int i = 1; for (String path : twitterComponentPaths) { predicateMap.put("property." + (i++) + "_value", path.toString()); } predicateMap.put("p.limit", "-1"); QueryBuilder queryBuilder = resourceResolver.adaptTo(QueryBuilder.class); Session session = resourceResolver.adaptTo(Session.class); Query query = queryBuilder.createQuery(PredicateGroup.create(predicateMap), session); SearchResult result = query.getResult(); Iterator<Resource> resources = result.getResources(); while (resources.hasNext()) { twitterResources.add(resources.next()); } return twitterResources; } private String processTweet(Status status) { String tweet = status.getText(); for (URLEntity entity : status.getURLEntities()) { String url = String.format("<a target=\"_blank\" href=\"%s\">%s</a>", entity.getURL(), entity.getURL()); tweet = tweet.replace(entity.getURL(), url); } return tweet; } private void handleReplication(PageManager pageManager, Resource twitterResource) throws ReplicationException { if (isReplicationEnabled(twitterResource)) { Session session = twitterResource.getResourceResolver().adaptTo(Session.class); replicator.replicate(session, ReplicationActionType.ACTIVATE, twitterResource.getPath()); } } private boolean isReplicationEnabled(Resource twitterResource) { ValueMap properties = ResourceUtil.getValueMap(twitterResource); return properties.get("replicate", false); } }