001/**
002 * Copyright (c) 2012, 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.tools.twitter.modes.filter;
031
032import java.io.IOException;
033import java.util.ArrayList;
034import java.util.List;
035import java.util.Map;
036
037import org.kohsuke.args4j.Option;
038import org.openimaj.text.nlp.language.LanguageDetector.WeightedLocale;
039import org.openimaj.tools.twitter.modes.preprocessing.LanguageDetectionMode;
040import org.openimaj.tools.twitter.modes.preprocessing.TwitterPreprocessingMode;
041import org.openimaj.twitter.USMFStatus;
042
043public class LanguageFilter extends TwitterPreprocessingPredicate {
044        
045        @Option(name="--accept-language", aliases="-l", required=false, usage="Using detected language, accept these languages", metaVar="STRING", multiValued=true)
046        List<String> localeMatch = new ArrayList<String>();
047        
048        private LanguageDetectionMode langMode;
049        
050        
051        /**
052         * @param languages
053         */
054        public LanguageFilter(String ... languages) {
055                for (String string : languages) {
056                        localeMatch.add(string);
057                }
058        }
059
060        @Override
061        public boolean test(USMFStatus twitterStatus) {
062                try {
063                        Map<String,Object> localeMap = TwitterPreprocessingMode.results(twitterStatus,langMode);
064                        WeightedLocale locale = WeightedLocale.fromMap(localeMap);
065                        for (String lang : this.localeMatch) {
066                                if(locale.language.equals(lang)) return true;
067                        }
068                        
069                        return false;
070                } catch (Exception e) {
071                        return false;
072                }
073        }
074        
075        @Override
076        public void validate() {
077                try {
078                        this.langMode = new LanguageDetectionMode();
079                } catch (IOException e) {
080                }
081        }
082
083}