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/* MultiDoc.java --
   Copyright (C) 2004, 2006 Free Software Foundation, Inc.
 
This file is part of GNU Classpath.
 
GNU Classpath 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, or (at your option)
any later version.
 
GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
 
Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
 
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
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or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
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exception statement from your version. */
 
 
package javax.print;
 
import java.io.IOException;
 
 
/**
 * <code>MultiDoc</code> defines the interface for objects providing multiple
 * documents for use in a print job.
 * <p>
 * Implementations of this interface are used to pass multiple documents, to be
 * printed as one print job, to the <code>MultiDocPrintJob</code> instance.
 * </p><p>
 * There exists no implementation of this interface in the Java Print Service
 * API. Implementors may assume the following usage in print jobs and the needed
 * behaviour for implementations: The print job fetches the single documents via
 * iteration by consecutive calls of the {@link #getDoc()} method to obtain the
 * current document follwing calls of the {@link #next()} method to get the next
 * multidoc object for the next <code>getDoc()</code> method call (if returned
 * multidoc object is not <code>null</code>). The print service will fetch the
 * document object and then retrieve the print data from the document before it
 * proceeds with the next call for the next MultiDoc object in the sequence.
 * </p><p>
 * Implementations of this interface have to be multiple thread-safe.
 * </p>
 *
 * @author Michael Koch (konqueror@gmx.de)
 */
public interface MultiDoc
{
  /**
   * Returns the current document.
   *
   * @return The current document.
   *
   * @throws IOException if an error occurs
   */
  Doc getDoc() throws IOException;
 
  /**
   * Returns the next <code>MultiDoc</code> object that contains the
   * next document for retrieval.
   *
   * @return The next <code>MultiDoc</code> object, or <code>null</code>
   * if no more documents are available.
   *
   * @throws IOException if an error occurs
   */
  MultiDoc next() throws IOException;
}