com.jaeksoft.searchlib.index.IndexDirectory.java Source code

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Here is the source code for com.jaeksoft.searchlib.index.IndexDirectory.java

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/**   
 * License Agreement for OpenSearchServer
 *
 * Copyright (C) 2008-2014 Emmanuel Keller / Jaeksoft
 * 
 * http://www.open-search-server.com
 * 
 * This file is part of OpenSearchServer.
 *
 * OpenSearchServer 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.
 *
 * OpenSearchServer 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 OpenSearchServer. 
 *  If not, see <http://www.gnu.org/licenses/>.
 **/

package com.jaeksoft.searchlib.index;

import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Map;

import org.apache.commons.exec.OS;
import org.apache.commons.lang.ArrayUtils;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.NIOFSDirectory;
import org.apache.lucene.store.NoSuchDirectoryException;
import org.json.JSONException;

import com.jaeksoft.searchlib.Logging;
import com.jaeksoft.searchlib.SearchLibException;
import com.jaeksoft.searchlib.crawler.file.process.fileInstances.swift.SwiftToken;
import com.jaeksoft.searchlib.crawler.file.process.fileInstances.swift.SwiftToken.AuthType;
import com.jaeksoft.searchlib.crawler.web.spider.HttpDownloader;
import com.jaeksoft.searchlib.util.LinkUtils;
import com.jaeksoft.searchlib.util.ReadWriteLock;

public class IndexDirectory {

    private Directory directory;
    private final ReadWriteLock rwl = new ReadWriteLock();

    protected IndexDirectory(File indexDir) throws IOException {
        if (OS.isFamilyWindows())
            directory = FSDirectory.open(indexDir);
        else
            directory = NIOFSDirectory.open(indexDir);
    }

    /**
     * Create an index directory using an index remotely stored using the Object
     * Storage API.
     * 
     * The URI should be created like that:
     * SWIFT://localhost?tenant=&container=&user=&password=&url=
     * 
     * The parameters must be URL encoded as UTF-8
     * 
     * @param uri
     * @throws IOException
     * @throws URISyntaxException
     * @throws JSONException
     * @throws SearchLibException
     */
    protected IndexDirectory(final URI uri)
            throws IOException, URISyntaxException, JSONException, SearchLibException {
        if ("SWIFT".equals(uri.getScheme())) {
            HttpDownloader httpDownloader = new HttpDownloader(null, true, null);
            Map<String, String> parameters = LinkUtils.getUniqueQueryParameters(uri, "UTF-8");
            String tenant = parameters.get("tenant");
            String container = parameters.get("container");
            String user = parameters.get("user");
            String password = parameters.get("password");
            String url = parameters.get("url");
            SwiftToken token = new SwiftToken(httpDownloader, url, user, password, AuthType.KEYSTONE, tenant);
            directory = new ObjectStorageDirectory(httpDownloader, token, container);
            return;
        }
        throw new IOException("Unsupported protocol: " + uri);
    }

    public Directory getDirectory() {
        rwl.r.lock();
        try {
            return directory;
        } finally {
            rwl.r.unlock();
        }
    }

    public boolean isEmpty() throws IOException {
        rwl.r.lock();
        try {
            return ArrayUtils.isEmpty(directory.listAll());
        } catch (NoSuchDirectoryException e) {
            return true;
        } finally {
            rwl.r.unlock();
        }
    }

    public void unlock() {
        rwl.w.lock();
        try {
            if (directory == null)
                return;
            if (!IndexWriter.isLocked(directory))
                return;
            IndexWriter.unlock(directory);
        } catch (Throwable e) {
            Logging.warn(e);
        } finally {
            rwl.w.unlock();
        }
    }

    public void close() {
        rwl.w.lock();
        try {
            if (directory == null)
                return;
            try {
                directory.close();
            } catch (IOException e) {
                Logging.warn(e.getMessage(), e);
            }
            directory = null;
        } finally {
            rwl.w.unlock();
        }
    }

}