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Java classes providing resolving functionality for Persistent Identifiers. Main focus is on National Bibliography Numbers, but some other known systems are also supported. See the official URN:NBN Resolver http://nbn-resolving.org or http://persid.org

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/* *********************************************************************
 * Class HTTPResolver
 * 
 * Copyright (c) 2010-2013, German National Library / Deutsche Nationalbibliothek
 * Adickesallee 1, D-60322 Frankfurt am Main, Federal Republic of Germany 
 *
 * This program is free software.
 * For your convenience it is dual licensed.
 * You can redistribute it and/or modify it under the terms of
 * one of the following licenses:
 * 
 * 1.)
 * 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.
 * You should have received a copy of the GNU General Public License
 * along with this program (gpl-3.0.txt); if not please read
 * http://www.gnu.org/licenses/gpl.html
 * 
 * 2.)
 * The European Union Public Licence as published by
 * The European Commission (executive body of the European Union);
 * either version 1.1 of the License, or (at your option) any later version.
 * You should have received a copy of the European Union Public Licence
 * along with this program (eupl_v1.1_en.pdf); if not please read
 * http://www.osor.eu/eupl
 * 
 * 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 above licenses for more details.
 * 
 * Jürgen Kett, Kadir Karaca Kocer -- German National Library
 * 
 **********************************************************************/

/* ********************************************************************
 * CHANGELOG:
 * 2013-02-27 Class marked @Deprecated to force the usage of
 *            eu.europeanaconnect.erds.HTTPResolverMultiThreaded instead, Karaca
 * 2010-05-05 Refactoring + new package structure by Karaca Kocer
 * 2010-04-25 Code formatting, comments and license text by Karaca Kocer
 * Created on 2010-03-17 by Jürgen Kett
 ********************************************************************/

package eu.europeanaconnect.erds;


/**
 * Simple Resolver that queries a remote server via HTTP.
 * It fetches the URL by reading the header of the
 * redirect-response of the remote resolver
 * (DEPRECATED! Please use the Multi-Threaded-Version)
 * 
 * @author Jürgen Kett (Original code)
 * @author Kadir Karaca Kocer (Refactoring, license text, comments & JavaDoc)
 * @author Nuno Freire (Refactoring)
 * @see eu.europeanaconnect.erds.HTTPResolverMultiThreaded
 */

public abstract class HTTPResolver implements DataProvider {

    /**
     * Fetches the URL out of the header of the redirect response
     * of the remote resolver using the "Location" attribute
     * 
     * @see DataProvider#getResponse(ResolverRequest)
     * @since 17.03.2010
     */
    @Override
    public abstract ResolverResponse getResponse(ResolverRequest resolverRequest) throws ResolverException;
}