1 /* 2 * ==================================================================== 3 * The Apache Software License, Version 1.1 4 * 5 * Copyright (c) 2000 The Apache Software Foundation. All rights 6 * reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. The end-user documentation included with the redistribution, 21 * if any, must include the following acknowledgment: 22 * "This product includes software developed by the 23 * Apache Software Foundation (http://www.apache.org/)." 24 * Alternately, this acknowledgment may appear in the software itself, 25 * if and wherever such third-party acknowledgments normally appear. 26 * 27 * 4. The names "Apache" and "Apache Software Foundation" must 28 * not be used to endorse or promote products derived from this 29 * software without prior written permission. For written 30 * permission, please contact apache@apache.org. 31 * 32 * 5. Products derived from this software may not be called "Apache", 33 * nor may "Apache" appear in their name, without prior written 34 * permission of the Apache Software Foundation. 35 * 36 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 37 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 38 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 39 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 42 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 43 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 44 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 45 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 46 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 47 * SUCH DAMAGE. 48 * ==================================================================== 49 * 50 * This software consists of voluntary contributions made by many 51 * individuals on behalf of the Apache Software Foundation. For more 52 * information on the Apache Software Foundation, please see 53 * <http://www.apache.org/>. 54 */ 55 package org.apache.poi.hpsf; 56 57 import java.util.*; 58 import org.apache.poi.util.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 1.7 2003/02/01 13:28:28 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 int getByteOrder() 105 { 106 return delegate.getByteOrder(); 107 } 108 109 110 111 public int getFormat() 112 { 113 return delegate.getFormat(); 114 } 115 116 117 118 public long 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 long 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