net.bluemix.newsaggregator.TwitterUtilities.java Source code

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Here is the source code for net.bluemix.newsaggregator.TwitterUtilities.java

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/*
 * Copyright IBM Corp. 2014
 *
 * 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.
 */
package net.bluemix.newsaggregator;

import net.bluemix.newsaggregator.api.API;
import twitter4j.Status;
import twitter4j.StatusUpdate;
import twitter4j.Twitter;
import twitter4j.TwitterFactory;
import twitter4j.auth.AccessToken;

public class TwitterUtilities {

    private static TwitterUtilities singleton;

    static public TwitterUtilities getSingleton() {
        if (singleton == null) {
            singleton = new TwitterUtilities();
        }
        return singleton;
    }

    public TwitterUtilities() {
    }

    public String tweetNewsEntry(String newsEntryId) {
        if (newsEntryId == null)
            return null;
        if (newsEntryId.equalsIgnoreCase(""))
            return null;

        try {
            NewsEntry newsEntry = API.getSingleton().getCuratedNewsEntryById(newsEntryId);
            if (newsEntry == null)
                return null;

            Person person = API.getSingleton().getPersonById(newsEntry.getPersonId());
            if (person == null)
                return null;

            String title = newsEntry.getTitle();
            String link = newsEntry.getLink();
            String personName = person.getTwitter();
            if ((personName == null) || personName.equalsIgnoreCase("")) {
                personName = person.getDisplayName();
            }
            if ((personName == null) || personName.equalsIgnoreCase("")) {
                personName = "";
            } else {
                personName = " via " + personName;
            }

            String hashtag = " #bluemix";

            int l = 140 - 37 - personName.length();
            if (title.length() >= l) {
                title = title.substring(0, l - 4) + "...";
            }

            String message = title + personName + hashtag + " " + link;

            return tweet(message);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    private String tweet(String message) {
        String output = null;
        if (message == null)
            return null;
        if (message.equalsIgnoreCase(""))
            return null;

        try {
            String consumerKey = ConfigUtilities.getSingleton().getTwitterConsumerKey();
            String consumerSecret = ConfigUtilities.getSingleton().getTwitterConsumerSecret();
            String accessToken = ConfigUtilities.getSingleton().getTwitterAccessToken();
            String accessTokenSecret = ConfigUtilities.getSingleton().getTwitterAccessTokenSecret();

            TwitterFactory twitterFactory = new TwitterFactory();
            Twitter twitter = twitterFactory.getInstance();
            twitter.setOAuthConsumer(consumerKey, consumerSecret);
            twitter.setOAuthAccessToken(new AccessToken(accessToken, accessTokenSecret));

            StatusUpdate statusUpdate = new StatusUpdate(message);

            Status status = twitter.updateStatus(statusUpdate);
            if (status == null)
                return null;
            output = "https://twitter.com/BluemixInfo/status/" + String.valueOf(status.getId());

            return output;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return output;
    }

    public static void main(String[] args) {
        TwitterUtilities.getSingleton().tweetNewsEntry("356b8741-eea3-4f95-8a20-b713478663e9");
    }
}