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187
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1 /*
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2 * FileOps -- Utility class for file operations
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3 *
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4 * Digital Image Library servlet components
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5 *
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6 * Copyright (C) 2001, 2002 Robert Casties (robcast@mail.berlios.de)
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7 *
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8 * This program is free software; you can redistribute it and/or modify it
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9 * under the terms of the GNU General Public License as published by the Free
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10 * Software Foundation; either version 2 of the License, or (at your option)
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11 * any later version.
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12 *
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13 * Please read license.txt for the full details. A copy of the GPL may be found
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14 * at http://www.gnu.org/copyleft/lgpl.html
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15 *
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16 * You should have received a copy of the GNU General Public License along with
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17 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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18 * Place, Suite 330, Boston, MA 02111-1307 USA
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19 *
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20 */
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1
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21
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22 package digilib.io;
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23
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159
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24 import java.io.File;
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25 import java.io.FileFilter;
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259
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26 import java.util.ArrayList;
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27 import java.util.HashMap;
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159
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28 import java.util.Iterator;
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259
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29 import java.util.List;
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30 import java.util.Map;
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159
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31 import java.util.StringTokenizer;
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1
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32
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33 public class FileOps {
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34
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259
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35 /**
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36 * Array of file extensions and corresponding mime-types.
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37 */
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459
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38 private static final String[][] ft = { { "jpg", "image/jpeg" },
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259
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39 { "jpeg", "image/jpeg" }, { "jp2", "image/jp2" },
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40 { "png", "image/png" }, { "gif", "image/gif" },
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41 { "tif", "image/tiff" }, { "tiff", "image/tiff" },
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459
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42 { "fpx", "image/fpx" },
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259
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43 { "txt", "text/plain" }, { "html", "text/html" },
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44 { "htm", "text/html" }, { "xml", "text/xml" },
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459
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45 { "svg", "image/svg+xml" }, { "meta", "text/xml" } };
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1
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46
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531
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47 public static Map<String, String> fileTypes;
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259
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48
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531
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49 public static List<String> imageExtensions;
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91
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50
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531
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51 public static List<String> textExtensions;
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187
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52
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531
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53 public static List<String> svgExtensions;
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187
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54
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563
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55 public static enum FileClass {NONE, IMAGE, TEXT, SVG}
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159
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56
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259
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57 public static final Integer HINT_BASEDIRS = new Integer(1);
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58
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59 public static final Integer HINT_FILEEXT = new Integer(2);
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60
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61 public static final Integer HINT_DIRS = new Integer(3);
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62
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63 /**
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64 * static initializer for FileOps
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65 */
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66 static {
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531
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67 fileTypes = new HashMap<String, String>();
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68 imageExtensions = new ArrayList<String>();
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69 textExtensions = new ArrayList<String>();
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70 svgExtensions = new ArrayList<String>();
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271
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71 // iterate through file types in ft and fill the Map and Lists
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259
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72 for (int i = 0; i < ft.length; i++) {
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73 String ext = ft[i][0];
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74 String mt = ft[i][1];
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75 fileTypes.put(ext, mt);
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563
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76 if (classForMimetype(mt) == FileClass.IMAGE) {
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259
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77 imageExtensions.add(ext);
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563
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78 } else if (classForMimetype(mt) == FileClass.TEXT) {
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259
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79 textExtensions.add(ext);
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563
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80 } else if (classForMimetype(mt) == FileClass.SVG) {
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259
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81 svgExtensions.add(ext);
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82 }
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83 }
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84 }
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85
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86 /**
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87 * returns the file class for a mime-type
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88 *
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89 * @param mt
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90 * @return
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91 */
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563
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92 public static FileClass classForMimetype(String mt) {
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259
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93 if (mt == null) {
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563
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94 return FileClass.NONE;
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259
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95 }
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96 if (mt.startsWith("image/svg")) {
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563
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97 return FileClass.SVG;
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259
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98 } else if (mt.startsWith("image")) {
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563
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99 return FileClass.IMAGE;
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259
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100 } else if (mt.startsWith("text")) {
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563
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101 return FileClass.TEXT;
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259
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102 }
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563
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103 return FileClass.NONE;
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259
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104 }
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105
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91
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106 /**
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187
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107 * get the mime type for a file format (by extension)
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91
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108 */
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109 public static String mimeForFile(File f) {
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821
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110 if (f == null) {
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111 return null;
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112 }
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113 return fileTypes.get(extname(f.getName().toLowerCase()));
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91
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114 }
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1
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115
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159
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116 /**
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117 * get the file class for the filename (by extension)
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187
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118 *
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159
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119 * @param fn
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120 * @return
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121 */
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563
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122 public static FileClass classForFilename(String fn) {
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259
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123 String mt = (String) fileTypes.get(extname(fn).toLowerCase());
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124 return classForMimetype(mt);
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91
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125 }
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1
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126
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531
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127 public static Iterator<String> getImageExtensionIterator() {
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259
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128 return imageExtensions.iterator();
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159
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129 }
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130
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531
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131 public static List<String> getImageExtensions() {
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132 return imageExtensions;
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133 }
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134
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135 public static Iterator<String> getTextExtensionIterator() {
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259
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136 return textExtensions.iterator();
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159
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137 }
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187
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138
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531
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139 public static List<String> getTextExtensions() {
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140 return textExtensions;
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141 }
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142
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143 public static Iterator<String> getSVGExtensionIterator() {
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259
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144 return svgExtensions.iterator();
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187
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145 }
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146
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531
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147 public static List<String> getSvgExtensions() {
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148 return svgExtensions;
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149 }
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1
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150
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151
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91
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152 /**
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187
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153 * convert a string with a list of pathnames into an array of strings using
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154 * the system's path separator string
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152
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155 */
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156 public static String[] pathToArray(String paths) {
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157 // split list into directories
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159
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158 StringTokenizer dirs = new StringTokenizer(paths, File.pathSeparator);
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152
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159 int n = dirs.countTokens();
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160 if (n < 1) {
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161 return null;
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162 }
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163 // add directories into array
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164 String[] pathArray = new String[n];
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165 for (int i = 0; i < n; i++) {
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166 String s = dirs.nextToken();
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167 // make shure the dir name ends with a directory separator
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168 if (s.endsWith(File.separator)) {
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169 pathArray[i] = s;
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170 } else {
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171 pathArray[i] = s + File.separator;
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172 }
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173 }
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174 return pathArray;
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175 }
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187
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176
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177 /**
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178 * Extract the base of a file name (sans extension).
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176
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179 *
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187
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180 * Returns the filename without the extension. The extension is the part
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181 * behind the last dot in the filename. If the filename has no dot the full
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182 * file name is returned.
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183 *
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176
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184 * @param fn
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185 * @return
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186 */
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187 public static String basename(String fn) {
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271
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188 if (fn == null) {
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189 return null;
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190 }
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176
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191 int i = fn.lastIndexOf('.');
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192 if (i > 0) {
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193 return fn.substring(0, i);
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194 }
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195 return fn;
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196 }
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197
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187
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198 /**
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199 * Extract the extension of a file name.
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176
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200 *
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201 * Returns the extension of a file name. The extension is the part behind
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259
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202 * the last dot in the filename. If the filename has no dot the empty string
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203 * is returned.
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187
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204 *
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176
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205 * @param fn
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206 * @return
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207 */
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208 public static String extname(String fn) {
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271
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209 if (fn == null) {
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210 return null;
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211 }
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176
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212 int i = fn.lastIndexOf('.');
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213 if (i > 0) {
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187
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214 return fn.substring(i + 1);
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176
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215 }
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216 return "";
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217 }
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152
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218
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246
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219 /**
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220 * Extract the parent directory of a (digilib) path name.
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221 *
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259
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222 * Returns the parent directory of a path name. The parent is the part
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223 * before the last slash in the path name. If the path name has no slash the
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224 * empty string is returned.
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246
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225 *
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226 * @param fn
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227 * @return
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228 */
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229 public static String parent(String fn) {
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271
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230 if (fn == null) {
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231 return null;
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232 }
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246
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233 int i = fn.lastIndexOf('/');
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234 if (i > 0) {
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235 return fn.substring(0, i);
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236 }
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237 return "";
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238 }
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239
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259
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240 /**
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241 * Normalize a path name.
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197
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242 *
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243 * Removes leading and trailing slashes. Returns null if there is other
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259
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244 * unwanted stuff in the path name.
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197
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245 *
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246 * @param pathname
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247 * @return
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248 */
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249 public static String normalName(String pathname) {
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271
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250 if (pathname == null) {
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251 return null;
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252 }
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197
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253 // upper-dir references are unwanted
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254 if (pathname.indexOf("../") >= 0) {
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255 return null;
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256 }
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257 int a = 0;
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209
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258 int e = pathname.length() - 1;
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259 if (e < 0) {
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260 return pathname;
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261 }
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197
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262 // leading and trailing "/" are removed
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209
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263 while ((a <= e) && (pathname.charAt(a) == '/')) {
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197
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264 a++;
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265 }
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209
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266 while ((a < e) && (pathname.charAt(e) == '/')) {
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259
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267 e--;
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197
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268 }
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209
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269 return pathname.substring(a, e + 1);
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197
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270 }
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259
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271
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272 /**
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273 * FileFilter for general files
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274 */
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275 static class ReadableFileFilter implements FileFilter {
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276
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277 public boolean accept(File f) {
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278 return f.canRead();
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279 }
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280 }
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281
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152
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282 /**
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187
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283 * FileFilter for image types (helper class for getFile)
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91
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284 */
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285 static class ImageFileFilter implements FileFilter {
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1
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286
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91
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287 public boolean accept(File f) {
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563
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288 return (classForFilename(f.getName()) == FileClass.IMAGE);
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187
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289 }
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290 }
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291
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292 /**
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293 * FileFilter for text types (helper class for getFile)
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294 */
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295 static class TextFileFilter implements FileFilter {
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296
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297 public boolean accept(File f) {
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563
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298 return (classForFilename(f.getName()) == FileClass.TEXT);
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91
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299 }
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300 }
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1
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301
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159
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302 /**
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187
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303 * FileFilter for svg types (helper class for getFile).
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304 *
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159
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305 */
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187
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306 static class SVGFileFilter implements FileFilter {
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159
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307
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308 public boolean accept(File f) {
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563
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309 return (classForFilename(f.getName()) == FileClass.SVG);
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159
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310 }
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311 }
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312
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187
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313 /**
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314 * Factory for FileFilters (image or text).
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159
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315 *
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316 * @param fileClass
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317 * @return
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187
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318 */
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563
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319 public static FileFilter filterForClass(FileClass fileClass) {
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320 if (fileClass == FileClass.IMAGE) {
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159
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321 return new ImageFileFilter();
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322 }
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563
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323 if (fileClass == FileClass.TEXT) {
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159
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324 return new TextFileFilter();
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325 }
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563
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326 if (fileClass == FileClass.SVG) {
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187
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327 return new SVGFileFilter();
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328 }
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159
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329 return null;
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330 }
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331
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259
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332 /**
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333 * Factory for DocuDirents based on file class.
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187
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334 *
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583
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335 * Returns an ImageSet, TextFile or SVGFile. scaleDirs are
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259
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336 * only for ImageFilesets.
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187
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337 *
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338 * @param fileClass
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339 * @param file
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583
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340 * @param scaleDirs
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259
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341 * optional additional parameters
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187
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342 * @return
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343 */
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583
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344 public static DocuDirent fileForClass(FileClass fileClass, File file, Directory[] scaleDirs) {
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187
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345 // what class of file do we have?
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563
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346 if (fileClass == FileClass.IMAGE) {
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187
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347 // image file
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583
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348 return new ImageFileSet(file, scaleDirs);
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563
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349 } else if (fileClass == FileClass.TEXT) {
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187
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350 // text file
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259
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351 return new TextFile(file);
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563
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352 } else if (fileClass == FileClass.SVG) {
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187
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353 // text file
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259
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354 return new SVGFile(file);
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187
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355 }
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356 return null;
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357 }
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259
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358
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359 /**
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360 * Filters a list of Files through a FileFilter.
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361 *
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362 * @param files
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363 * @param filter
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364 * @return
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365 */
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366 public static File[] listFiles(File[] files, FileFilter filter) {
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367 if (files == null) {
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368 return null;
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369 }
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370 File[] ff = new File[files.length];
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371 int ffi = 0;
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372 for (int i = 0; i < files.length; i++) {
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373 if (filter.accept(files[i])) {
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374 ff[ffi] = files[i];
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375 ffi++;
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376 }
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377 }
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378 File[] fff = new File[ffi];
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379 System.arraycopy(ff, 0, fff, 0, ffi);
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380 return fff;
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381 }
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382
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383 /**
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384 * Creates a new hints Map with the given first element.
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385 *
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386 * @param type
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387 * @param value
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388 * @return
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389 */
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531
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390 public static Map<Integer, Object> newHints(Integer type, Object value) {
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391 Map<Integer, Object> m = new HashMap<Integer, Object>();
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259
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392 if (type != null) {
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393 m.put(type, value);
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394 }
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395 return m;
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396 }
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397
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1
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398 }
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