1    /* ====================================================================
2     * The Apache Software License, Version 1.1
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4     * Copyright (c) 2000 The Apache Software Foundation.  All rights
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14    * 2. Redistributions in binary form must reproduce the above copyright
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24    *    if and wherever such third-party acknowledgments normally appear.
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49    * This software consists of voluntary contributions made by many
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54    * Portions of this software are based upon public domain software
55    * originally written at the National Center for Supercomputing Applications,
56    * University of Illinois, Urbana-Champaign.
57    */
58   
59   package org.apache.poi.hpsf;
60   
61   import java.io.*;
62   
63   /**
64    * <p>Factory class to create instances of {@link SummaryInformation},
65    * {@link DocumentSummaryInformation} and {@link PropertySet}.</p>
66    *
67    * @author Rainer Klute (klute@rainer-klute.de)
68    * @version $Id: PropertySetFactory.java,v 1.1 2002/02/14 04:00:59 mjohnson Exp $
69    * @since 2002-02-09
70    */
71   public class PropertySetFactory
72   {
73   
74       /**
75        * <p>Creates the most specific {@link PropertySet} from an {@link
76        * InputStream}. This is preferrably a {@link
77        * DocumentSummaryInformation} or a {@link SummaryInformation}. If
78        * the specified {@link InputStream} does not contain a property
79        * set stream, an exception is thrown and the {@link InputStream}
80        * is repositioned at its beginning.</p>
81        *
82        * @param stream Contains the property set stream's data.
83        */
84       public static PropertySet create(final InputStream stream)
85           throws NoPropertySetStreamException, MarkUnsupportedException,
86                  UnexpectedPropertySetTypeException, IOException
87       {
88           final PropertySet ps = new PropertySet(stream);
89           if (ps.isSummaryInformation())
90               return new SummaryInformation(ps);
91           else if (ps.isDocumentSummaryInformation())
92               return new DocumentSummaryInformation(ps);
93           else
94               return ps;
95       }
96   
97   }
98