Twitter4J Streaming API - filter method support - Java Social Media

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Description

Twitter4J Streaming API - filter method support

Demo Code

/*/*from w  w  w  .j  a  va  2s .  c  o  m*/
 * Copyright 2007 Yusuke Yamamoto
 *
 * 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 twitter4j.examples.stream;

import twitter4j.*;

import java.util.ArrayList;
import java.util.Arrays;

/**
 * <p>This is a code example of Twitter4J Streaming API - filter method support.<br>
 * Usage: java twitter4j.examples.stream.PrintFilterStream [follow(comma separated numerical user ids)] [track(comma separated filter terms)]<br>
 * </p>
 *
 * @author Yusuke Yamamoto - yusuke at mac.com
 */
public final class PrintFilterStream {
    /**
     * Main entry of this application.
     *
     * @param args follow(comma separated user ids) track(comma separated filter terms)
     * @throws twitter4j.TwitterException
     */
    public static void main(String[] args) throws TwitterException {
        if (args.length < 1) {
            System.out
                    .println("Usage: java twitter4j.examples.PrintFilterStream [follow(comma separated numerical user ids)] [track(comma separated filter terms)]");
            System.exit(-1);
        }

        StatusListener listener = new StatusListener() {
            @Override
            public void onStatus(Status status) {
                System.out.println("@" + status.getUser().getScreenName()
                        + " - " + status.getText());
            }

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

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

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

            @Override
            public void onStallWarning(StallWarning warning) {
                System.out.println("Got stall warning:" + warning);
            }

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

        TwitterStream twitterStream = new TwitterStreamFactory()
                .getInstance();
        twitterStream.addListener(listener);
        ArrayList<Long> follow = new ArrayList<Long>();
        ArrayList<String> track = new ArrayList<String>();
        for (String arg : args) {
            if (isNumericalArgument(arg)) {
                for (String id : arg.split(",")) {
                    follow.add(Long.parseLong(id));
                }
            } else {
                track.addAll(Arrays.asList(arg.split(",")));
            }
        }
        long[] followArray = new long[follow.size()];
        for (int i = 0; i < follow.size(); i++) {
            followArray[i] = follow.get(i);
        }
        String[] trackArray = track.toArray(new String[track.size()]);

        // filter() method internally creates a thread which manipulates TwitterStream and calls these adequate listener methods continuously.
        twitterStream.filter(new FilterQuery(0, followArray, trackArray));
    }

    private static boolean isNumericalArgument(String argument) {
        String args[] = argument.split(",");
        boolean isNumericalArgument = true;
        for (String arg : args) {
            try {
                Integer.parseInt(arg);
            } catch (NumberFormatException nfe) {
                isNumericalArgument = false;
                break;
            }
        }
        return isNumericalArgument;
    }
}

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