/**
* This method construct hashTag graph to calculate the degree
*
* @param tweetList
* @return
*/
private HashMap<String, Set<String>> getHashTagGraph(List<Tweet> tweetList) {
HashMap<String, Set<String>> hashTagGraph = new HashMap<String, Set<String>>(20);
// Iterate through each tweet's hastags to construct the graph
for (Tweet tweet : tweetList) {
Set<String> hashTags = tweet.getHashTags();
if (hashTags.size() >= 2) {
for (String hashTag : hashTags) {
for (String innerHashTag : hashTags) {
if (!hashTag.equalsIgnoreCase(innerHashTag)) {
Set<String> entries = hashTagGraph.get(hashTag);
if (entries == null) {
entries = new HashSet<String>();
}
entries.add(innerHashTag);
hashTagGraph.put(hashTag, entries);
}
}
}
}
}
return hashTagGraph;
}
/**
* This method performed followint tasks 1. Extract tweet text from tweetline and created_at time
* 2. Clean the tweet text by removing unicodes and replacing non-ascii characters 3. Persist
* cleaned tweet text and time into file
*
* @param cleanTweetFileWriter
* @param tweet
* @throws Exception
*/
private void persistCleantedTweet(BufferedWriter cleanTweetFileWriter, Tweet tweet)
throws Exception {
if (cleanTweetFileWriter != null && tweet != null) {
// Format the tweet text and created date
String formattedTweetText =
tweet.getTweetText().getTweetText() + " (" + tweet.getCreatedDate() + ")";
// Persist formatted text into file and append new line.
cleanTweetFileWriter.write(formattedTweetText);
cleanTweetFileWriter.newLine();
}
}
/**
* This method iterates through tweets and removes it from the list if its created timestamp is
* older than 60seconds from latest tweet
*
* @param tweetList
* @param latestTweet
*/
private List<Tweet> getLast60SecondsTweets(List<Tweet> tweetList, Tweet latestTweet) {
List<Tweet> last60SecondsTweetList = new ArrayList<Tweet>(20);
for (Tweet tweet : tweetList) {
if ((latestTweet.getTimeInMS() - tweet.getTimeInMS()) / 1000 <= 60) {
last60SecondsTweetList.add(tweet);
}
}
last60SecondsTweetList.add(latestTweet);
return last60SecondsTweetList;
}
public void performAndPersistTweetAnalysis() {
// Holders for tweet input file and analysis output files
BufferedReader tweetFeed = null;
BufferedWriter cleanTweetWriter = null;
BufferedWriter hashTagDegreeWriter = null;
// To hold last 60 seconds tweets
List<Tweet> last60SecondsTweets = new ArrayList<Tweet>(20);
// To hold the count of tweets which has unicodes
long tweetCount = 0;
try {
// Open input tweet file
tweetFeed =
new BufferedReader(
new InputStreamReader(
this.getClass().getResourceAsStream("../../../tweet_input/tweets.txt")));
// Performed substring to remove "file:/" from path
String cleanTweetFilePath =
this.getClass().getResource("../../../tweet_output/ft1.txt").toString().substring(6);
String degreeCalcFilePath =
this.getClass().getResource("../../../tweet_output/ft2.txt").toString().substring(6);
// Open output files to persist cleaned tweet and hashtag degree.
cleanTweetWriter =
new BufferedWriter(
new OutputStreamWriter(new FileOutputStream(new File(cleanTweetFilePath))));
hashTagDegreeWriter =
new BufferedWriter(
new OutputStreamWriter(new FileOutputStream(new File(degreeCalcFilePath))));
// To hold tweet from input file and model
String tweetText = null;
Tweet tweet = null;
// Iterate through the tweets and process it
while ((tweetText = tweetFeed.readLine()) != null) {
// To get Tweet model from raw tweet
tweet = TweetProcessor.parseTweet(tweetText);
if (tweet.getTweetText() != null) {
// Persist cleaned tweet text with created date
persistCleantedTweet(cleanTweetWriter, tweet);
// Persist average degree of hashtag graph from tweet
persistHashTagDegree(hashTagDegreeWriter, last60SecondsTweets, tweet);
if (tweet.getTweetText() != null && tweet.getTweetText().isHasUniCodes()) {
tweetCount++;
}
}
}
// To add unicode tweet text statistic to the file
if (tweetCount > 0) {
String statText = Long.toString(tweetCount) + " tweets contained unicode.";
cleanTweetWriter.newLine();
cleanTweetWriter.write(statText);
}
} catch (Exception ex) {
System.out.println("Exception :" + ex.getMessage());
ex.printStackTrace();
} finally {
// To close input/output file connections
try {
if (tweetFeed != null) {
tweetFeed.close();
}
if (cleanTweetWriter != null) {
cleanTweetWriter.close();
}
if (hashTagDegreeWriter != null) {
hashTagDegreeWriter.close();
}
} catch (Exception ex) {
System.out.println(ex.getMessage());
}
}
}