1 /* ==================================================================== 2 * The Apache Software License, Version 1.1 3 * 4 * Copyright (c) 2000 The Apache Software Foundation. All rights 5 * reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 19 * 3. The end-user documentation included with the redistribution, 20 * if any, must include the following acknowledgment: 21 * "This product includes software developed by the 22 * Apache Software Foundation (http://www.apache.org/)." 23 * Alternately, this acknowledgment may appear in the software itself, 24 * if and wherever such third-party acknowledgments normally appear. 25 * 26 * 4. The names "Apache" and "Apache Software Foundation" must 27 * not be used to endorse or promote products derived from this 28 * software without prior written permission. For written 29 * permission, please contact apache@apache.org. 30 * 31 * 5. Products derived from this software may not be called "Apache", 32 * nor may "Apache" appear in their name, without prior written 33 * permission of the Apache Software Foundation. 34 * 35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 46 * SUCH DAMAGE. 47 * ==================================================================== 48 * 49 * This software consists of voluntary contributions made by many 50 * individuals on behalf of the Apache Software Foundation. For more 51 * information on the Apache Software Foundation, please see 52 * <http://www.apache.org/>. 53 * 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.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