src/main/java/eu/svjatoslav/meviz/htmlindexer/Utils.java

   1 /*
   2  * Meviz - Various tools collection to work with multimedia.
   3  * Copyright (C) 2012, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public License
   7  * as published by the Free Software Foundation.
   8  */
   9
  10 package eu.svjatoslav.meviz.htmlindexer;
  11
  12 import java.awt.image.BufferedImage;
  13 import java.io.BufferedReader;
  14 import java.io.File;
  15 import java.io.FileNotFoundException;
  16 import java.io.FileReader;
  17 import java.io.IOException;
  18 import java.util.HashSet;
  19 import java.util.zip.CRC32;
  20
  21 import javax.imageio.ImageIO;
  22
  23 import eu.svjatoslav.meviz.htmlindexer.layouts.MixedLayout;
  24
  25 public class Utils {
  26
  27         /**
  28          * Load image into {@link BufferedImage} and return it. Caches last loaded
  29          * image to speed up subsequent loading attempts.
  30          *
  31          * @throws ImageFormatError
  32          * @throws IOException
  33          */
  34         public static BufferedImage getBufferedImage(final File file)
  35                         throws ImageFormatError, IOException {
  36                 if (file.equals(lastLoadedFile))
  37                         return lastLoadedBufferedImage;
  38
  39                 System.out.println("Loading image: " + file.getPath());
  40                 lastLoadedBufferedImage = ImageIO.read(file);
  41                 lastLoadedFile = file;
  42
  43                 if (lastLoadedBufferedImage == null) {
  44                         System.out.println("Error reading image: " + file);
  45                         throw new ImageFormatError("File: " + file
  46                                         + " is not a valid image.");
  47
  48                 }
  49
  50                 return lastLoadedBufferedImage;
  51         }
  52
  53         public static File getLayoutIndexFile(final Layout layout,
  54                         final File directoryToIndex) {
  55
  56                 final String indexFilePath = directoryToIndex.getAbsolutePath()
  57                                 + "/index" + layout.getFileNameSuffix() + ".html";
  58
  59                 return new File(indexFilePath);
  60         }
  61
  62         public static HashSet<Layout> getLayouts() {
  63                 final HashSet<Layout> layouts = new HashSet<Layout>();
  64                 layouts.add(new MixedLayout());
  65                 return layouts;
  66         }
  67
  68         public static String getStringCrcAsHex(final String input) {
  69
  70                 // create a new CRC-calculating object
  71                 final CRC32 crc = new CRC32();
  72
  73                 // loop, calculating CRC for each byte of the string
  74                 // There is no CRC16.update(byte[]) method.
  75                 for (final byte b : input.getBytes())
  76                         crc.update(b);
  77
  78                 // note use crc.value, not crc.getValue()
  79                 final String hex = Integer.toHexString((int) crc.getValue())
  80                                 .toUpperCase();
  81
  82                 // System.out.println("Input string: " + input);
  83                 // System.out.println("Result: " + hex);
  84
  85                 return hex;
  86         }
  87
  88         public static File getThumbnailsDirectory(final File directoryToIndex) {
  89                 return new File(getThumbnailsDirectoryPath(directoryToIndex));
  90         }
  91
  92         public static String getThumbnailsDirectoryPath(final File directoryToIndex) {
  93                 return directoryToIndex.getAbsolutePath() + "/"
  94                                 + Constants.THUMBNAILS_DIRECTORY_NAME + "/";
  95         }
  96
  97         public static boolean isMevizGeneratedIndexFile(final File indexFile)
  98                         throws FileNotFoundException, IOException {
  99
 100                 boolean isMevizFile = false;
 101
 102                 final FileReader fileReader = new FileReader(indexFile);
 103                 final BufferedReader reader = new BufferedReader(fileReader);
 104
 105                 parseFile: {
 106                         while (true) {
 107                                 final String line = reader.readLine();
 108
 109                                 if (line == null)
 110                                         break parseFile;
 111
 112                                 if (line.contains(Constants.HTML_MAGIC_STRING)) {
 113                                         isMevizFile = true;
 114                                         break parseFile;
 115                                 }
 116                         }
 117                 }
 118
 119                 reader.close();
 120                 fileReader.close();
 121                 return isMevizFile;
 122         }
 123
 124         private static File lastLoadedFile;
 125
 126         private static BufferedImage lastLoadedBufferedImage;
 127
 128 }