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    /* CorbaEntrySource.java
     *
     * created: Wed Jun  7 2000
     *
     * This file is part of Artemis
     *
     * Copyright (C) 2000  Genome Research Limited
     *
     * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
     *
     * $Header: //tmp/pathsoft/artemis/uk/ac/sanger/artemis/components/CorbaEntrySource.java,v 1.1 2004-06-09 09:46:11 tjc Exp $
     */
    
    package uk.ac.sanger.artemis.components;
    
    import java.io.*;
    import java.net.*;
    import java.awt.*;
    
    import javax.swing.*;
    
    /**
     *  This class contains the methods common to all EntrySource implementations
     *  that read from a CORBA server.
     *
     *  @author Kim Rutherford <kmr@sanger.ac.uk>
     *  @version $Id: CorbaEntrySource.java,v 1.1 2004-06-09 09:46:11 tjc Exp $
     **/
    
    abstract public class CorbaEntrySource {
      /**
       *  Create a new CorbaEntrySource using the given URL as the location of the
       *  server IOR.
       *  @param frame The component that created this EntrySource.  (Used for
       *    requesters.)
       *  @param ior_url_string A String containing the URL of the IOR for the
       *    server.
       **/
      public CorbaEntrySource (final JFrame frame,
                               final String ior_url_string)
          throws MalformedURLException //, IOException
      {
        this.frame = frame;
        this.ior_url = new URL (ior_url_string);
      }
    
      /**
       *  Finds and returns a stringified object reference (IOR) for a CORBA
       *  server.  The IOR is read from the URL that was passed to the
       *  constructor.
       *  @return The stringified IOR.
       *  @exception IOException Thrown if an error occurs while reading.
       **/
      public String getIOR ()
          throws IOException {
        //  get URL of IOR
        final BufferedReader in =
          new BufferedReader (new InputStreamReader (ior_url.openStream()));
        return in.readLine();
      }
    
      /**
       *  Return the JFrame that was passed to the constructor.
       **/
      public JFrame getFrame () {
        return frame;
      }
    
      /**
       *  The URL containing the IOR of the CORBA server.
       **/
      private URL ior_url = null;
    
      /**
       *  The JFrame that was passed to the constructor.
       **/
      private JFrame frame = null;
    }