crawler.DataStream.java Source code

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Here is the source code for crawler.DataStream.java

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/* Copyright [2014] [Xinyue Wang]
   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 crawler;

import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.TermAttribute;
import org.apache.lucene.analysis.tokenattributes.TypeAttribute;

import crawler.util.Settings;
import crawler.util.analyzer.TwitterAnalyzer;

import twitter4j.HashtagEntity;
import twitter4j.StallWarning;
import twitter4j.Status;
import twitter4j.StatusDeletionNotice;
import twitter4j.StatusListener;

public class DataStream implements StatusListener {
    private ArrayList<Status> statusRepo = new ArrayList<Status>();

    public ArrayList<Status> getList() {
        ArrayList<Status> statuses = new ArrayList<Status>(statusRepo);
        statusRepo.clear();
        return statuses;
    }

    public int getSize() {
        return statusRepo.size();
    }

    private void freqUpdate(Status status) {
        //String hashtags = "";//
        HashtagEntity[] tags = status.getHashtagEntities();
        for (HashtagEntity t : tags) {
            String hashtag = "#" + t.getText().toLowerCase();

            int val = 1;
            if (Settings.TFHashtagFreq.containsKey(hashtag)) {
                val += Settings.TFHashtagFreq.get(hashtag);
            }
            Settings.TFHashtagFreq.put(hashtag, val);

            //hashtags+=t.getText()+",";//

        }
        //System.out.println(status.getCreatedAt()+", [" + hashtags + "] - " + status.getText());//
    }

    public void onStatus(Status status) {
        if (!trash(status.getText())) {
            statusRepo.add(status);
            freqUpdate(status);
        }
        /*HashtagEntity[] tags = status.getHashtagEntities();
        String hashtags = "";
        for (HashtagEntity t: tags) hashtags+=t.getText()+",";
        System.out.println(status.getCreatedAt()+", [" + hashtags + "] - " + status.getText());*/
    }

    private boolean trash(String tweet) {
        Analyzer analyzer = new TwitterAnalyzer();

        StringReader in = new StringReader(tweet);
        TokenStream ts = analyzer.tokenStream("body", in);
        TermAttribute termAtt = ts.addAttribute(TermAttribute.class);
        TypeAttribute typeAttr = ts.addAttribute(TypeAttribute.class);
        int totalCount = 0, hashCount = 0;
        //Vector v = new SequentialAccessSparseVector(100);                   
        try {
            while (ts.incrementToken()) {
                char[] termBuffer = termAtt.termBuffer();
                int termLen = termAtt.termLength();

                //System.out.println(w);
                if (typeAttr.type().equals("hashtag"))
                    hashCount++;
                totalCount++;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        if (totalCount - hashCount <= 1)
            return true;
        else
            return false;
    }

    public void onDeletionNotice(StatusDeletionNotice statusDeletionNotice) {
        //System.out.println("Got a status deletion notice id:" + statusDeletionNotice.getStatusId());
    }

    public void onTrackLimitationNotice(int numberOfLimitedStatuses) {
        //System.out.println("Got track limitation notice:" + numberOfLimitedStatuses);
    }

    public void onScrubGeo(long userId, long upToStatusId) {
        //System.out.println("Got scrub_geo event userId:" + userId + " upToStatusId:" + upToStatusId);
    }

    public void onException(Exception ex) {
        ex.printStackTrace();
    }

    @Override
    public void onStallWarning(StallWarning arg0) {
        // TODO Auto-generated method stub

    }
}