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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

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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.

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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

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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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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;

}