src/main/java/charactermanaj/util/FileUserData.java

   1 package charactermanaj.util;\r
   2 \r
   3 import java.io.BufferedInputStream;\r
   4 import java.io.BufferedOutputStream;\r
   5 import java.io.File;\r
   6 import java.io.FileInputStream;\r
   7 import java.io.FileOutputStream;\r
   8 import java.io.IOException;\r
   9 import java.io.InputStream;\r
  10 import java.io.ObjectInputStream;\r
  11 import java.io.ObjectOutputStream;\r
  12 import java.io.OutputStream;\r
  13 import java.util.logging.Level;\r
  14 import java.util.logging.Logger;\r
  15 \r
  16 /**\r
  17  * ファイルベースのユーザーデータの保存先の実装\r
  18  * @author seraphy\r
  19  */\r
  20 public class FileUserData implements UserData {\r
  21 \r
  22         /**\r
  23          * ロガー\r
  24          */\r
  25         private static final Logger logger = Logger.getLogger(FileUserData.class.getName());\r
  26 \r
  27         /**\r
  28          * 保存先ファイル\r
  29          */\r
  30         private File file;\r
  31         \r
  32         public FileUserData(File file) {\r
  33                 if (file == null) {\r
  34                         throw new IllegalArgumentException();\r
  35                 }\r
  36                 this.file = file;\r
  37         }\r
  38         \r
  39         public boolean exists() {\r
  40                 return file.exists() && file.isFile();\r
  41         }\r
  42         \r
  43         public long lastModified() {\r
  44                 return file.lastModified();\r
  45         }\r
  46         \r
  47         public InputStream openStream() throws IOException {\r
  48                 return new BufferedInputStream(new FileInputStream(file));\r
  49         }\r
  50         \r
  51         public OutputStream getOutputStream() throws IOException {\r
  52                 return new BufferedOutputStream(new FileOutputStream(file));\r
  53         }\r
  54         \r
  55         public boolean delete() {\r
  56                 try {\r
  57                         return file.delete();\r
  58 \r
  59                 } catch (Exception ex) {\r
  60                         // セキュリティ例外ぐらい.\r
  61                         logger.log(Level.WARNING, "file removing failed." + file, ex);\r
  62                         return false;\r
  63                 }\r
  64         }\r
  65         \r
  66         public void save(Object userData) throws IOException {\r
  67                 ObjectOutputStream oos = new ObjectOutputStream(getOutputStream());\r
  68                 try {\r
  69                         oos.writeObject(userData);\r
  70                         oos.close();\r
  71                 } finally {\r
  72                         oos.close();\r
  73                 }\r
  74         }\r
  75 \r
  76         public Object load() throws IOException {\r
  77                 ObjectInputStream ois = new ObjectInputStream(openStream());\r
  78                 try {\r
  79                         try {\r
  80                                 return ois.readObject();\r
  81 \r
  82                         } catch (ClassNotFoundException ex) {\r
  83                                 // 復元先クラスがみつからないということは、このアプリケーションの保存した形式としておかしい\r
  84                                 IOException ex2 = new IOException("invalid format.");\r
  85                                 ex2.initCause(ex2);\r
  86                                 throw ex2;\r
  87                         }\r
  88                 } finally {\r
  89                         ois.close();\r
  90                 }\r
  91         }\r
  92         \r
  93         @Override\r
  94         public String toString() {\r
  95                 return "FileUserData{file:" + file + "}";\r
  96         }\r
  97 }