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54   
55   package org.apache.poi.hpsf;
56   
57   import java.util.*;
58   import org.apache.poi.hpsf.littleendian.*;
59   
60   /**
61    * <p>Abstract superclass for the convenience classes {@link
62    * SummaryInformation} and {@link DocumentSummaryInformation}.</p>
63    *
64    * <p>The motivation behind this class is quite nasty if you look
65    * behind the scenes, but it serves the application programmer well by
66    * providing him with the easy-to-use {@link SummaryInformation} and
67    * {@link DocumentSummaryInformation} classes. When parsing the data a
68    * property set stream consists of (possibly coming from an {@link
69    * java.io.InputStream}) we want to read and process each byte only
70    * once. Since we don't know in advance which kind of property set we
71    * have, we can expect only the most general {@link
72    * PropertySet}. Creating a special subclass should be as easy as
73    * calling the special subclass' constructor and pass the general
74    * {@link PropertySet} in. To make things easy internally, the special
75    * class just holds a reference to the general {@link PropertySet} and
76    * delegates all method calls to it.</p>
77    *
78    * <p>A cleaner implementation would have been like this: The {@link
79    * PropertySetFactory} parses the stream data into some internal
80    * object first. Then it finds out whether the stream is a {@link
81    * SummaryInformation}, a {@link DocumentSummaryInformation} or a
82    * general {@link PropertySet}. However, the current implementation
83    * went the other way round historically: the convenience classes came
84    * only late to my mind.</p>
85    *
86    * @author Rainer Klute (klute@rainer-klute.de)
87    * @version $Id: SpecialPropertySet.java,v 1.3 2002/05/01 09:31:52 klute Exp $
88    * @since 2002-02-09
89    */
90   public abstract class SpecialPropertySet extends PropertySet
91   {
92   
93       private PropertySet delegate;
94   
95   
96   
97       public SpecialPropertySet(PropertySet ps)
98       {
99           delegate = ps;
100      }
101  
102  
103  
104      public Word getByteOrder()
105      {
106          return delegate.getByteOrder();
107      }
108  
109  
110  
111      public Word getFormat()
112      {
113          return delegate.getFormat();
114      }
115  
116  
117  
118      public DWord getOSVersion()
119      {
120          return delegate.getOSVersion();
121      }
122  
123  
124  
125      public ClassID getClassID()
126      {
127          return delegate.getClassID();
128      }
129  
130  
131  
132      public int getSectionCount()
133      {
134          return delegate.getSectionCount();
135      }
136  
137  
138  
139      public List getSections()
140      {
141          return delegate.getSections();
142      }
143  
144  
145  
146      public boolean isSummaryInformation()
147      {
148          return delegate.isSummaryInformation();
149      }
150  
151  
152  
153      public boolean isDocumentSummaryInformation()
154      {
155          return delegate.isDocumentSummaryInformation();
156      }
157  
158  
159  
160      public Section getSingleSection()
161      {
162          return delegate.getSingleSection();
163      }
164  
165  }
166