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54   
55   package org.apache.poi.hpsf;
56   
57   import java.io.*;
58   
59   /**
60    * <p>Factory class to create instances of {@link SummaryInformation},
61    * {@link DocumentSummaryInformation} and {@link PropertySet}.</p>
62    *
63    * @author Rainer Klute (klute@rainer-klute.de)
64    * @version $Id: PropertySetFactory.java,v 1.3 2002/05/01 09:31:52 klute Exp $
65    * @since 2002-02-09
66    */
67   public class PropertySetFactory
68   {
69   
70       /**
71        * <p>Creates the most specific {@link PropertySet} from an {@link
72        * InputStream}. This is preferrably a {@link
73        * DocumentSummaryInformation} or a {@link SummaryInformation}. If
74        * the specified {@link InputStream} does not contain a property
75        * set stream, an exception is thrown and the {@link InputStream}
76        * is repositioned at its beginning.</p>
77        *
78        * @param stream Contains the property set stream's data.
79        */
80       public static PropertySet create(final InputStream stream)
81           throws NoPropertySetStreamException, MarkUnsupportedException,
82                  UnexpectedPropertySetTypeException, IOException
83       {
84           final PropertySet ps = new PropertySet(stream);
85           if (ps.isSummaryInformation())
86               return new SummaryInformation(ps);
87           else if (ps.isDocumentSummaryInformation())
88               return new DocumentSummaryInformation(ps);
89           else
90               return ps;
91       }
92   
93   }
94