Example usage for org.apache.lucene.index DirectoryReader open

List of usage examples for org.apache.lucene.index DirectoryReader open

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Introduction

In this page you can find the example usage for org.apache.lucene.index DirectoryReader open.

Prototype

public static DirectoryReader open(final IndexCommit commit) throws IOException

Source Link

Document

Expert: returns an IndexReader reading the index in the given IndexCommit .

Usage

From source file:com.gprasad.searchwithlucene.Searcher.java

private static void createIndexSearcher(String indexPath) throws IOException {
    Directory directory = FSDirectory.open(Paths.get(indexPath));
    DirectoryReader directoryReader = DirectoryReader.open(directory);
    indexSearcher = new IndexSearcher(directoryReader);
}

From source file:com.helger.pd.indexer.lucene.PDLucene.java

License:Apache License

@Nullable
private DirectoryReader _getReader() throws IOException {
    _checkClosing();/* w ww .  j ava  2 s.  c o  m*/
    try {
        // Commit the writer changes only if a reader is requested
        if (m_aWriterChanges.intValue() > 0) {
            s_aLogger.info("Lazily committing " + m_aWriterChanges.intValue() + " changes to the Lucene index");
            _getWriter().commit();
            m_aWriterChanges.set(0);
        }

        // Is a new reader required because the index changed?
        final DirectoryReader aNewReader = m_aIndexReader != null
                ? DirectoryReader.openIfChanged(m_aIndexReader)
                : DirectoryReader.open(m_aDir);
        if (aNewReader != null) {
            // Something changed in the index
            m_aIndexReader = aNewReader;
            m_aSearcher = null;

            if (s_aLogger.isDebugEnabled())
                s_aLogger.debug("Contents of index changed. Creating new index reader");
        }
        return m_aIndexReader;
    } catch (final IndexNotFoundException ex) {
        // No such index
        return null;
    }
}

From source file:com.hrstc.lucene.queryexpansion.PatentClassCodeBasedQueryExpansion.java

License:Apache License

public PatentClassCodeBasedQueryExpansion(String classCodesIndexDir, int Nbr_Terms, float alpha, float beta,
        float decay) throws IOException, Exception {
    Directory classCodesDir = FSDirectory.open(new File(classCodesIndexDir));
    classCodesSearcher = new IndexSearcher(DirectoryReader.open(classCodesDir));
    parameters = new HashMap<>();
    parameters.put(RocchioQueryExpansion.ROCCHIO_ALPHA_FLD, alpha);
    parameters.put(RocchioQueryExpansion.ROCCHIO_BETA_FLD, beta);
    parameters.put(RocchioQueryExpansion.DECAY_FLD, decay);
    this.Nbr_Terms = Nbr_Terms;

}

From source file:com.hrstc.lucene.queryexpansion.PatentRocchioQueryExpansion.java

License:Apache License

public PatentRocchioQueryExpansion(String indexDir, int Nbr_Docs, int Nbr_Terms, int source, float alpha,
        float beta, float gamma, float decay) throws IOException, Exception {
    Directory dir = FSDirectory.open(new File(indexDir));
    searcher = new IndexSearcher(DirectoryReader.open(dir));
    parameters = new HashMap<>();
    parameters.put(RocchioQueryExpansion.ROCCHIO_ALPHA_FLD, alpha);
    parameters.put(RocchioQueryExpansion.ROCCHIO_BETA_FLD, beta);
    parameters.put(RocchioQueryExpansion.ROCCHIO_GAMMA_FLD, gamma);
    parameters.put(RocchioQueryExpansion.DECAY_FLD, decay);
    this.Nbr_Docs = Nbr_Docs;
    this.Nbr_Terms = Nbr_Terms;
    this.source = source;
    if (source <= 0 || source == 4 || source == 6 || source > 7) {
        throw new Exception("Invalid source of expansion!");
    }//from   w w  w  . j  av  a2 s . co  m
}

From source file:com.hrstc.lucene.queryreduction.PatentClassCodeBasedQueryReduction.java

License:Apache License

public PatentClassCodeBasedQueryReduction(String classCodesIndexDir, int Nbr_Terms)
        throws IOException, Exception {
    Directory classCodesDir = FSDirectory.open(new File(classCodesIndexDir));
    classCodesSearcher = new IndexSearcher(DirectoryReader.open(classCodesDir));
    this.Nbr_Terms = Nbr_Terms;

}

From source file:com.hrstc.lucene.queryreduction.PatentRocchioQueryReduction.java

License:Apache License

public PatentRocchioQueryReduction(String indexDir, int Nbr_Docs, int Nbr_Terms, int source, float alpha,
        float beta, float gamma, float decay) throws IOException, Exception {
    Directory dir = FSDirectory.open(new File(indexDir));
    searcher = new IndexSearcher(DirectoryReader.open(dir));
    parameters = new HashMap<>();
    parameters.put(RocchioQueryReduction.ROCCHIO_ALPHA_FLD, alpha);
    parameters.put(RocchioQueryReduction.ROCCHIO_BETA_FLD, beta);
    parameters.put(RocchioQueryReduction.ROCCHIO_GAMMA_FLD, gamma);
    parameters.put(RocchioQueryReduction.DECAY_FLD, decay);
    this.Nbr_Docs = Nbr_Docs;
    this.Nbr_Terms = Nbr_Terms;
    this.source = source;
    if (source <= 0 || source == 4 || source == 6 || source > 7) {
        throw new Exception("Invalid source of expansion!");
    }/* w  ww.ja va  2 s.c  o  m*/
}

From source file:com.humi.lucene.test.SearchFiles.java

License:Apache License

/** Simple command-line based search demo. */
public static void main(String[] args) throws Exception {
    String usage = "Usage:\tjava org.apache.lucene.demo.SearchFiles [-index dir] [-field f] [-repeat n] [-queries file] [-query string] [-raw] [-paging hitsPerPage]\n\nSee http://lucene.apache.org/core/4_1_0/demo/ for details.";
    if (args.length > 0 && ("-h".equals(args[0]) || "-help".equals(args[0]))) {
        System.out.println(usage);
        System.exit(0);/*w  w  w  . j  av a  2  s. co m*/
    }

    String index = "index";
    String field = "contents";
    String queries = null;
    int repeat = 0;
    boolean raw = false;
    String queryString = null;
    int hitsPerPage = 10;

    for (int i = 0; i < args.length; i++) {
        if ("-index".equals(args[i])) {
            index = args[i + 1];
            i++;
        } else if ("-field".equals(args[i])) {
            field = args[i + 1];
            i++;
        } else if ("-queries".equals(args[i])) {
            queries = args[i + 1];
            i++;
        } else if ("-query".equals(args[i])) {
            queryString = args[i + 1];
            i++;
        } else if ("-repeat".equals(args[i])) {
            repeat = Integer.parseInt(args[i + 1]);
            i++;
        } else if ("-raw".equals(args[i])) {
            raw = true;
        } else if ("-paging".equals(args[i])) {
            hitsPerPage = Integer.parseInt(args[i + 1]);
            if (hitsPerPage <= 0) {
                System.err.println("There must be at least 1 hit per page.");
                System.exit(1);
            }
            i++;
        }
    }

    IndexReader reader = DirectoryReader.open(FSDirectory.open(new File(index)));
    IndexSearcher searcher = new IndexSearcher(reader);
    // :Post-Release-Update-Version.LUCENE_XY:
    Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_4_10_0);

    BufferedReader in = null;
    if (queries != null) {
        in = new BufferedReader(new InputStreamReader(new FileInputStream(queries), StandardCharsets.UTF_8));
    } else {
        in = new BufferedReader(new InputStreamReader(System.in, StandardCharsets.UTF_8));
    }
    // :Post-Release-Update-Version.LUCENE_XY:
    QueryParser parser = new QueryParser(Version.LUCENE_4_10_0, field, analyzer);
    while (true) {
        if (queries == null && queryString == null) { // prompt the user
            System.out.println("Enter query: ");
        }

        String line = queryString != null ? queryString : in.readLine();

        if (line == null || line.length() == -1) {
            break;
        }

        line = line.trim();
        if (line.length() == 0) {
            break;
        }

        Query query = parser.parse(line);
        System.out.println("Searching for: " + query.toString(field));

        if (repeat > 0) { // repeat & time as benchmark
            Date start = new Date();
            for (int i = 0; i < repeat; i++) {
                searcher.search(query, null, 100);
            }
            Date end = new Date();
            System.out.println("Time: " + (end.getTime() - start.getTime()) + "ms");
        }

        doPagingSearch(in, searcher, query, hitsPerPage, raw, queries == null && queryString == null);

        if (queryString != null) {
            break;
        }
    }
    reader.close();
}

From source file:com.ibm.watson.developer_cloud.professor_languo.pipeline.primary_search.LuceneSearcher.java

License:Open Source License

@Override
public void initialize(Properties properties) throws SearchException {
    String resDirPath = properties.getProperty(ConfigurationConstants.INGESTION_BASE_DIR) + File.separator;
    if (properties.getProperty(ConfigurationConstants.INDEX_DIR_TYPE)
            .equals(ConfigurationConstants.IndexDirTypes.FS.toString())) {
        String indexDirPath = resDirPath + properties.getProperty(ConfigurationConstants.INDEX_DIR);
        try {//from w  w  w  . j  a  va2  s.c o  m
            Directory indexDir = FSDirectory.open(new File(indexDirPath).toPath());
            indexReader = DirectoryReader.open(indexDir);
            searcher = new IndexSearcher(indexReader);
        } catch (IOException e) {
            throw new SearchException(e);
        }
    } else {
        throw new SearchException(Messages.getString("RetrieveAndRank.LUCENE_SEARCHER_INIT")); //$NON-NLS-1$
    }
    candidateAnswerNum = Integer.parseInt(properties.getProperty(ConfigurationConstants.CANDIDATE_ANSWER_NUM));
}

From source file:com.ibm.watson.developer_cloud.professor_languo.pipeline.primary_search.LuceneSearcher.java

License:Open Source License

/**
 * @deprecated - should only be used in the Unit Tests<br>
 *             Initialize this {@link LuceneSearcher} using a given Lucene directory
 *
 * @param indexDir - The {@link Directory} containing the index
 * @throws SearchException/*ww  w . ja  va  2  s .c  o m*/
 */
private void initialize(Directory indexDir) throws SearchException {
    try {
        indexReader = DirectoryReader.open(indexDir);
        searcher = new IndexSearcher(indexReader);
    } catch (IOException e) {
        throw new SearchException(e);
    }
}

From source file:com.icdd.lucence.SearchFiles.java

License:Apache License

public void searchFiles() {
    // //from w w w.j av  a  2  s.  co  m
    String index = "F:/download/index/";
    // 
    String field = "contents";
    // 
    String queries = null;
    // 
    String queryString = null;
    int repeat = 0;
    // ????
    boolean raw = false;
    // ?10?
    int hitsPerPage = 10;

    try {
        IndexReader reader = DirectoryReader.open(FSDirectory.open(Paths.get(index)));
        IndexSearcher searcher = new IndexSearcher(reader);
        Analyzer analyzer = new StandardAnalyzer();

        BufferedReader in = null;
        if (queries != null) {
            in = Files.newBufferedReader(Paths.get(queries), StandardCharsets.UTF_8);
        } else {
            in = new BufferedReader(new InputStreamReader(System.in, StandardCharsets.UTF_8));
        }
        QueryParser parser = new QueryParser(field, analyzer);
        while (true) {
            if (queryString == null && queries == null) {
                System.out.println("Enter query:");
            }

            String line = queryString != null ? queryString : in.readLine();

            if (line == null || line.length() == -1) {
                break;
            }
            line = line.trim();
            if (line.length() == 0) {
                break;
            }
            try {
                Query query = parser.parse(line);
                System.out.println("Searching for:" + query.toString(field));

                if (repeat > 0) { // repeat & time as benchmark
                    Date start = new Date();
                    for (int i = 0; i < repeat; i++) {
                        searcher.search(query, 100);
                    }
                    Date end = new Date();
                    System.out.println("Time: " + (end.getTime() - start.getTime()) + "ms");
                }

                doPagingSearch(in, searcher, query, hitsPerPage, raw, queries == null && queryString == null);

            } catch (ParseException e) {

                e.printStackTrace();
            }

            if (queryString != null) {
                break;
            }
        }
        reader.close();
    } catch (IOException e) {

        e.printStackTrace();
    }
}