net.sf.jabref.importer.fetcher.BibsonomyScraper.java Source code

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Here is the source code for net.sf.jabref.importer.fetcher.BibsonomyScraper.java

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/*  Copyright (C) 2003-2011 JabRef contributors.
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 2 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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package net.sf.jabref.importer.fetcher;

import java.io.IOException;
import java.io.StringReader;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Optional;

import net.sf.jabref.importer.ParserResult;
import net.sf.jabref.importer.fileformat.BibtexParser;
import net.sf.jabref.logic.net.URLDownload;
import net.sf.jabref.model.entry.BibEntry;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Convenience class for getting BibTeX entries from the BibSonomy scraper,
 * from an URL pointing to an entry.
 */
class BibsonomyScraper {

    private static final String BIBSONOMY_SCRAPER = "http://scraper.bibsonomy.org/service?url=";
    private static final String BIBSONOMY_SCRAPER_POST = "&format=bibtex";

    private static final Log LOGGER = LogFactory.getLog(BibsonomyScraper.class);

    /**
     * Return a BibEntry by looking up the given url from the BibSonomy scraper.
     * @param entryUrl
     * @return
     */
    public static Optional<BibEntry> getEntry(String entryUrl) {
        try {
            // Replace special characters by corresponding sequences:
            String cleanURL = entryUrl.replace("%", "%25").replace(":", "%3A").replace("/", "%2F")
                    .replace("?", "%3F").replace("&", "%26").replace("=", "%3D");

            URL url = new URL(
                    BibsonomyScraper.BIBSONOMY_SCRAPER + cleanURL + BibsonomyScraper.BIBSONOMY_SCRAPER_POST);
            String bibtex = new URLDownload(url).downloadToString(StandardCharsets.UTF_8);
            BibtexParser bp = new BibtexParser(new StringReader(bibtex));
            ParserResult pr = bp.parse();
            if ((pr != null) && pr.getDatabase().hasEntries()) {
                return Optional.of(pr.getDatabase().getEntries().iterator().next());
            } else {
                return Optional.empty();
            }

        } catch (IOException ex) {
            LOGGER.warn("Could not download entry", ex);
            return Optional.empty();
        } catch (RuntimeException ex) {
            LOGGER.warn("Could not get entry", ex);
            return Optional.empty();
        }
    }
}