001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.demos.twitter;
031
032import java.util.ArrayList;
033import java.util.HashSet;
034import java.util.List;
035
036import org.openimaj.util.data.Context;
037import org.openimaj.util.function.MultiFunction;
038import twitter4j.HashtagEntity;
039import twitter4j.Status;
040
041public class HashTagMatch implements MultiFunction<Status, Context> {
042
043        public static final String HASHTAG_KEY = "hastagmatch.hashtag";
044        private String[] hashtags;
045        private HashSet<String> hashes = new HashSet<String>();
046
047        public HashTagMatch(String[] hashtags) {
048                this.hashtags = hashtags;
049                for (String string : hashtags) {
050                        hashes .add(string);
051                }
052        }
053        @Override
054        public List<Context> apply(Status in) {
055                HashtagEntity[] tags = in.getHashtagEntities();
056                List<Context> ret = new ArrayList<Context>();
057                for (HashtagEntity hashtagEntity : tags) {
058                        String withHash = "#" + hashtagEntity.getText();
059                        
060                        if(hashes.contains(withHash)){
061                                Context ctx = new Context();
062                                ctx.put(HASHTAG_KEY, withHash);
063                                ctx.put("status", in);
064                                ret.add(ctx);
065                        }
066                }
067                return ret;
068        }
069
070}