com.ijuru.tweetgrab.web.GrabServlet.java Source code

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Here is the source code for com.ijuru.tweetgrab.web.GrabServlet.java

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/**
 * Copyright 2011 Rowan Seymour
 *
 * This file is part of TweetGrab.
 *
 * TweetGrab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * TweetGrab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with TweetGrab. If not, see <http://www.gnu.org/licenses/>.
 */

package com.ijuru.tweetgrab.web;

import com.ijuru.tweetgrab.Context;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.codehaus.jackson.map.ObjectMapper;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.Random;

import twitter4j.*;

/**
 * Grabs a tweet from a randomly selected account
 */
public class GrabServlet extends HttpServlet {

    protected static final Logger log = LogManager.getLogger(GrabServlet.class);

    private static final long serialVersionUID = 1L;

    private Random rand = new Random();

    private static final String ERROR_MESSAGE = "Something went wrong... sorry";

    /**
     * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        PrintWriter out = response.getWriter();

        // Get random account
        List<String> accounts = Context.getOptions().getAccounts();
        String randAccount = accounts.get(rand.nextInt(accounts.size()));

        try {
            Twitter twitter = Context.getTwitterFactory().getInstance();
            ResponseList<Status> tweets = twitter.getUserTimeline(randAccount);

            if (tweets.size() == 0) {
                log.warn("No tweets for " + randAccount);
                out.write(ERROR_MESSAGE);
                return;
            }

            // Pick random tweet
            Status randomTweet = tweets.get(rand.nextInt(tweets.size()));
            //long tweetId = randomTweet.getId();
            String tweetText = randomTweet.getText();

            out.write(tweetText);
        } catch (TwitterException ex) {
            log.error(ex);
            out.write(ERROR_MESSAGE);
            return;
        }
    }
}