src/main/java/eu/svjatoslav/meviz/htmlindexer/metadata/MetadadaHelper.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.metadata;
  11
  12 import java.io.ByteArrayOutputStream;
  13 import java.io.File;
  14 import java.io.FileInputStream;
  15 import java.io.IOException;
  16 import java.io.ObjectInputStream;
  17 import java.io.ObjectOutputStream;
  18
  19 import org.apache.log4j.Logger;
  20
  21 import eu.svjatoslav.commons.file.IOHelper;
  22
  23 public class MetadadaHelper {
  24
  25         public static final Logger logger = Logger.getLogger(MetadadaHelper.class);
  26
  27         /**
  28          * Load previously generated or initialize new directory metadata.
  29          */
  30         public static DirectoryMetadata initDirectoryMetadata(
  31                         final File metadataFile) {
  32
  33                 if (!metadataFile.exists())
  34                         return new DirectoryMetadata();
  35                 else
  36                         try {
  37
  38                                 final ObjectInputStream in = new ObjectInputStream(
  39                                                 new FileInputStream(metadataFile));
  40                                 final DirectoryMetadata directory = (DirectoryMetadata) in
  41                                                 .readObject();
  42                                 in.close();
  43
  44                                 return directory;
  45
  46                         } catch (final Exception exception) {
  47                                 logger.error("Cannot load existing directory metadata.",
  48                                                 exception);
  49
  50                                 return new DirectoryMetadata();
  51                         }
  52         }
  53
  54         public static void saveDirectoryMetadata(final File persistanceFile,
  55                         final DirectoryMetadata directory) throws IOException {
  56                 // serialize directory metadata into byte array
  57                 final ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
  58
  59                 final ObjectOutputStream out = new ObjectOutputStream(
  60                                 byteArrayOutputStream);
  61                 out.writeObject(directory);
  62                 out.close();
  63
  64                 // store byte array into file
  65                 IOHelper.saveToFile(persistanceFile,
  66                                 byteArrayOutputStream.toByteArray());
  67         }
  68 }