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58   
59   package org.apache.poi.hpsf;
60   
61   import java.util.*;
62   import org.apache.poi.hpsf.littleendian.*;
63   
64   /**
65    * <p>Abstract superclass for the convenience classes {@link
66    * SummaryInformation} and {@link DocumentSummaryInformation}.</p>
67    *
68    * <p>The motivation behind this class is quite nasty if you look
69    * behind the scenes, but it serves the application programmer well by
70    * providing him with the easy-to-use {@link SummaryInformation} and
71    * {@link DocumentSummaryInformation} classes. When parsing the data a
72    * property set stream consists of (possibly coming from an {@link
73    * java.io.InputStream}) we want to read and process each byte only
74    * once. Since we don't know in advance which kind of property set we
75    * have, we can expect only the most general {@link
76    * PropertySet}. Creating a special subclass should be as easy as
77    * calling the special subclass' constructor and pass the general
78    * {@link PropertySet} in. To make things easy internally, the special
79    * class just holds a reference to the general {@link PropertySet} and
80    * delegates all method calls to it.</p>
81    *
82    * <p>A cleaner implementation would have been like this: The {@link
83    * PropertySetFactory} parses the stream data into some internal
84    * object first. Then it finds out whether the stream is a {@link
85    * SummaryInformation}, a {@link DocumentSummaryInformation} or a
86    * general {@link PropertySet}. However, the current implementation
87    * went the other way round historically: the convenience classes came
88    * only late to my mind.</p>
89    *
90    * @author Rainer Klute (klute@rainer-klute.de)
91    * @version $Id: SpecialPropertySet.java,v 1.1 2002/02/14 04:00:59 mjohnson Exp $
92    * @since 2002-02-09
93    */
94   public abstract class SpecialPropertySet extends PropertySet
95   {
96   
97       private PropertySet delegate;
98   
99   
100  
101      public SpecialPropertySet(PropertySet ps)
102      {
103          delegate = ps;
104      }
105  
106  
107  
108      public Word getByteOrder()
109      {
110          return delegate.getByteOrder();
111      }
112  
113  
114  
115      public Word getFormat()
116      {
117          return delegate.getFormat();
118      }
119  
120  
121  
122      public DWord getOSVersion()
123      {
124          return delegate.getOSVersion();
125      }
126  
127  
128  
129      public ClassID getClassID()
130      {
131          return delegate.getClassID();
132      }
133  
134  
135  
136      public int getSectionCount()
137      {
138          return delegate.getSectionCount();
139      }
140  
141  
142  
143      public List getSections()
144      {
145          return delegate.getSections();
146      }
147  
148  
149  
150      public boolean isSummaryInformation()
151      {
152          return delegate.isSummaryInformation();
153      }
154  
155  
156  
157      public boolean isDocumentSummaryInformation()
158      {
159          return delegate.isDocumentSummaryInformation();
160      }
161  
162  
163  
164      public Section getSingleSection()
165      {
166          return delegate.getSingleSection();
167      }
168  
169  }
170