edu.rpi.tw.linkipedia.search.searching.EntitySearcher.java Source code

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Here is the source code for edu.rpi.tw.linkipedia.search.searching.EntitySearcher.java

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/**
 * Linkipedia, Copyright (c) 2015 Tetherless World Constellation 
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package edu.rpi.tw.linkipedia.search.searching;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.queries.CustomScoreQuery;
import org.apache.lucene.queries.function.FunctionQuery;
import org.apache.lucene.queries.function.valuesource.FloatFieldSource;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.queryparser.classic.QueryParser.Operator;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopScoreDocCollector;
import org.apache.lucene.search.payloads.AveragePayloadFunction;
import org.apache.lucene.search.payloads.MaxPayloadFunction;
import org.apache.lucene.search.payloads.PayloadTermQuery;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;

import edu.rpi.tw.linkipedia.search.query.WeightedQuery;
import edu.rpi.tw.linkipedia.search.similarity.MySimilarity;
import edu.rpi.tw.linkipedia.search.utils.Annotation;

public class EntitySearcher {
    boolean debug = false;
    IndexReader reader;
    IndexSearcher searcher;
    MaxPayloadFunction payloadFunctionMax = new MaxPayloadFunction();
    WeightedQuery wquery;

    public EntitySearcher(String indexDir) {
        try {
            IndexReader reader = DirectoryReader.open(FSDirectory.open(new File(indexDir)));
            searcher = new IndexSearcher(reader);
            searcher.setSimilarity(new MySimilarity());
            wquery = new WeightedQuery();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void setWeights(float labelWeight, float contentWeight, float relationWeight, float typeWeight,
            float defaultWeight) {
        wquery.setWeights(labelWeight, contentWeight, relationWeight, typeWeight, defaultWeight);
    }

    public ArrayList<Annotation> mysearch(String label, String[] contexts, int numResult) {
        ArrayList<Annotation> results = new ArrayList<Annotation>();
        TopScoreDocCollector collector = TopScoreDocCollector.create(numResult, false);

        try {

            Query finalQuery = wquery.parse(label, contexts);
            //System.out.println("QUERY: "+finalQuery.toString()+"\n");
            searcher.search(finalQuery, collector);
        } catch (Exception e) {
            e.printStackTrace();
        }
        ScoreDoc[] hits = collector.topDocs().scoreDocs;
        int numTotalHits = collector.getTotalHits();

        int start = 0;
        int end = Math.min(numTotalHits, numResult);
        if (end == 0) {
            return fuzzSearch(label, contexts, numResult);
        }
        for (int i = start; i < end; i++) {
            //String thisResult = "";
            Document doc = null;
            try {
                doc = searcher.doc(hits[i].doc);
            } catch (Exception e) {
                e.printStackTrace();
            }
            String url = doc.get("url");

            String[] labels = doc.getValues("label");
            String contents = "";
            for (int j = 0; j < labels.length; j++) {
                contents += "label: " + labels[j] + "\n";
            }
            String boost = doc.get("boost");

            Annotation annotation = new Annotation(label, url, hits[i].score);
            annotation.setContent(contents);
            if (debug)
                System.out.println(annotation + " " + boost);
            //      annotation.setTriples(new ArrayList<String>(Arrays.asList(triples)));
            results.add(annotation);
        }
        return results;
    }

    public ArrayList<Annotation> fuzzSearch(String label, String[] contexts, int numResult) {
        ArrayList<Annotation> results = new ArrayList<Annotation>();
        TopScoreDocCollector collector = TopScoreDocCollector.create(numResult, false);

        try {

            Query finalQuery = wquery.getFuzzyQuery(label, contexts);
            //System.out.println("QUERY: "+finalQuery.toString()+"\n");
            searcher.search(finalQuery, collector);
            //for(int i = start; i < )
        } catch (Exception e) {
            e.printStackTrace();
        }
        ScoreDoc[] hits = collector.topDocs().scoreDocs;
        int numTotalHits = collector.getTotalHits();

        int start = 0;
        int end = Math.min(numTotalHits, numResult);
        if (end == 0) {

            Annotation annotation = new Annotation(label, "", 0);
            results.add(annotation);
            return results;
        }
        for (int i = start; i < end; i++) {
            //String thisResult = "";
            Document doc = null;
            try {
                doc = searcher.doc(hits[i].doc);
            } catch (Exception e) {
                e.printStackTrace();
            }
            String[] labels = doc.getValues("defaultLabel");
            String url = doc.get("url");
            String boost = doc.get("boost");
            if (debug)
                System.out.println(url + " boost: " + boost + " score: " + hits[i].score);
            //         for(int j = 0 ; j < labels.length; j++){
            //            System.out.println("default label: "+labels[j]);
            //         }
            Annotation annotation = new Annotation(label, url, hits[i].score);
            //      annotation.setTriples(new ArrayList<String>(Arrays.asList(triples)));
            results.add(annotation);
        }

        return results;
    }
}