cc.wikitools.lucene.SearchWikipedia.java Source code

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Here is the source code for cc.wikitools.lucene.SearchWikipedia.java

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/**
 * wiki-tools-lucene: Java package for searching Wikipedia dumps with Lucene
 *
 * 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 cc.wikitools.lucene;

import java.io.File;
import java.io.PrintStream;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.lucene.document.Document;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;

import cc.wikitools.lucene.IndexWikipediaDump.IndexField;

public class SearchWikipedia {
    private static final int DEFAULT_NUM_RESULTS = 10;

    private static final String INDEX_OPTION = "index";
    private static final String QUERY_OPTION = "q";
    private static final String NUM_RESULTS_OPTION = "num_results";
    private static final String VERBOSE_OPTION = "verbose";
    private static final String ARTICLE_OPTION = "article";
    private static final String TITLE_OPTION = "title";

    @SuppressWarnings("static-access")
    public static void main(String[] args) throws Exception {
        Options options = new Options();
        options.addOption(
                OptionBuilder.withArgName("path").hasArg().withDescription("index location").create(INDEX_OPTION));
        options.addOption(
                OptionBuilder.withArgName("string").hasArg().withDescription("query text").create(QUERY_OPTION));
        options.addOption(OptionBuilder.withArgName("num").hasArg().withDescription("number of results to return")
                .create(NUM_RESULTS_OPTION));

        options.addOption(new Option(VERBOSE_OPTION, "print out complete document"));
        options.addOption(new Option(TITLE_OPTION, "search title"));
        options.addOption(new Option(ARTICLE_OPTION, "search article"));

        CommandLine cmdline = null;
        CommandLineParser parser = new GnuParser();
        try {
            cmdline = parser.parse(options, args);
        } catch (ParseException exp) {
            System.err.println("Error parsing command line: " + exp.getMessage());
            System.exit(-1);
        }

        if (!cmdline.hasOption(QUERY_OPTION) || !cmdline.hasOption(INDEX_OPTION)
                || !cmdline.hasOption(QUERY_OPTION)) {
            HelpFormatter formatter = new HelpFormatter();
            formatter.printHelp(SearchWikipedia.class.getName(), options);
            System.exit(-1);
        }

        File indexLocation = new File(cmdline.getOptionValue(INDEX_OPTION));
        if (!indexLocation.exists()) {
            System.err.println("Error: " + indexLocation + " does not exist!");
            System.exit(-1);
        }

        String queryText = cmdline.getOptionValue(QUERY_OPTION);
        int numResults = cmdline.hasOption(NUM_RESULTS_OPTION)
                ? Integer.parseInt(cmdline.getOptionValue(NUM_RESULTS_OPTION))
                : DEFAULT_NUM_RESULTS;
        boolean verbose = cmdline.hasOption(VERBOSE_OPTION);
        boolean searchArticle = !cmdline.hasOption(TITLE_OPTION);

        PrintStream out = new PrintStream(System.out, true, "UTF-8");

        WikipediaSearcher searcher = new WikipediaSearcher(indexLocation);
        TopDocs rs = null;
        if (searchArticle) {
            rs = searcher.searchArticle(queryText, numResults);
        } else {
            rs = searcher.searchTitle(queryText, numResults);
        }

        int i = 1;
        for (ScoreDoc scoreDoc : rs.scoreDocs) {
            Document hit = searcher.doc(scoreDoc.doc);

            out.println(String.format("%d. %s (wiki id = %s, lucene id = %d) %f", i,
                    hit.getField(IndexField.TITLE.name).stringValue(),
                    hit.getField(IndexField.ID.name).stringValue(), scoreDoc.doc, scoreDoc.score));
            if (verbose) {
                out.println("# " + hit.toString().replaceAll("[\\n\\r]+", " "));
            }
            i++;
        }

        searcher.close();
        out.close();
    }
}