Examples of java.io.File

java.io.File
File is a class which represents a file name or directory. The file may be absolute relative to the root directory of the file system or relative to the current directory in which the program is running.
This class provides methods for querying/changing information about the file and also directory listing capabilities if the File represents a directory.
When manipulating file paths, the static fields of this class may be used to determine the platform specific separators. @see java.io.Serializable @see java.lang.Comparable

   * @param absolute the File to convert to relative path
   * @return a File with a path that is relative to the user's directory
   * @exception Exception if the path cannot be constructed
   */
  protected static File createRelativePath(File absolute) throws Exception {
    File userDir = new File(System.getProperty("user.dir"));
    String userPath = userDir.getAbsolutePath() + File.separator;
    String targetPath = (new File(absolute.getParent())).getPath() 
      + File.separator;
    String fileName = absolute.getName();
    StringBuffer relativePath = new StringBuffer();
    //    relativePath.append("."+File.separator);
    //    System.err.println("User dir "+userPath);
    //    System.err.println("Target path "+targetPath);
    
    // file is in user dir (or subdir)
    int subdir = targetPath.indexOf(userPath);
    if (subdir == 0) {
      if (userPath.length() == targetPath.length()) {
  relativePath.append(fileName);
      } else {
  int ll = userPath.length();
  relativePath.append(targetPath.substring(ll));
  relativePath.append(fileName);
      }
    } else {
      int sepCount = 0;
      String temp = new String(userPath);
      while (temp.indexOf(File.separator) != -1) {
  int ind = temp.indexOf(File.separator);
  sepCount++;
  temp = temp.substring(ind+1, temp.length());
      }
      
      String targetTemp = new String(targetPath);
      String userTemp = new String(userPath);
      int tcount = 0;
      while (targetTemp.indexOf(File.separator) != -1) {
  int ind = targetTemp.indexOf(File.separator);
  int ind2 = userTemp.indexOf(File.separator);
  String tpart = targetTemp.substring(0,ind+1);
  String upart = userTemp.substring(0,ind2+1);
  if (tpart.compareTo(upart) != 0) {
    if (tcount == 0) {
      tcount = -1;
    }
    break;
  }
  tcount++;
  targetTemp = targetTemp.substring(ind+1, targetTemp.length());
  userTemp = userTemp.substring(ind2+1, userTemp.length());
      }
      if (tcount == -1) {
  // then target file is probably on another drive (under windows)
  throw new Exception("Can't construct a path to file relative to user "
          +"dir.");
      }
      if (targetTemp.indexOf(File.separator) == -1) {
  targetTemp = "";
      }
      for (int i = 0; i < sepCount - tcount; i++) {
  relativePath.append(".."+File.separator);
      }
      relativePath.append(targetTemp + fileName);
    }
    //    System.err.println("new path : "+relativePath.toString());
    return new File(relativePath.toString());
  }

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   * weka.gui.GUICHooser.HowToFindPackageManager).
   * @return true if the user has opted not to view the named dialog
   * in the future.
   */
  public static boolean getDontShowDialog(String dialogName) {
    File wekaHome = WekaPackageManager.WEKA_HOME;
    
    if (!wekaHome.exists()) {
      return false;
    }
    
    File dialogSubDir = new File(wekaHome.toString() + File.separator + "systemDialogs");
    if (!dialogSubDir.exists()) {
      return false;
    }
    
    File dialogFile = new File(dialogSubDir.toString() + File.separator + dialogName);
    
    return dialogFile.exists();
  }

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   * @throws Exception if the marker file that is used to indicate that
   * a named dialog is not to be shown can't be created. This file lives
   * in $WEKA_HOME/systemDialogs
   */
  public static void setDontShowDialog(String dialogName) throws Exception {
    File wekaHome = WekaPackageManager.WEKA_HOME;
    
    if (!wekaHome.exists()) {
      return;
    }
    
    File dialogSubDir = new File(wekaHome.toString() + File.separator + "systemDialogs");
    if (!dialogSubDir.exists()) {
      if (!dialogSubDir.mkdir()) {
        return;
      }
    }
    
    File dialogFile = new File(dialogSubDir.toString() + File.separator + dialogName);
    dialogFile.createNewFile();
  }

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  public static String getDontShowDialogResponse(String dialogName) throws Exception {
    if (!getDontShowDialog(dialogName)) {
      return null; // This must be the first time - no file recorded yet.
    }
    
    File wekaHome = WekaPackageManager.WEKA_HOME;
    File dialogSubDir = new File(wekaHome.toString() + File.separator 
        + "systemDialogs" + File.separator + dialogName);


    
    BufferedReader br = new BufferedReader(new FileReader(dialogSubDir));
    String response = br.readLine();

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   * @throws Exception if there is a problem saving the information
   */
  public static void setDontShowDialogResponse(String dialogName, String response) 
    throws Exception {
    
    File wekaHome = WekaPackageManager.WEKA_HOME;
    
    if (!wekaHome.exists()) {
      return;
    }
    
    File dialogSubDir = new File(wekaHome.toString() + File.separator + "systemDialogs");
    if (!dialogSubDir.exists()) {
      if (!dialogSubDir.mkdir()) {
        return;
      }
    }
    
    File dialogFile = new File(dialogSubDir.toString() + File.separator + dialogName);
    BufferedWriter br = new BufferedWriter(new FileWriter(dialogFile));
    br.write(response + "\n");
    br.flush();
    br.close();
  }

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      if (m_FileChooser == null) {
  createFileChooser();
      }
      int returnVal = m_FileChooser.showOpenDialog(this);
      if (returnVal == JFileChooser.APPROVE_OPTION) {
  File selected = m_FileChooser.getSelectedFile();
  try {
    ObjectInputStream oi = new ObjectInputStream(new BufferedInputStream(new FileInputStream(selected)));
    Object obj = oi.readObject();
    oi.close();
    if (!m_ClassType.isAssignableFrom(obj.getClass())) {
      throw new Exception("Object not of type: " + m_ClassType.getName());
    }
    return obj;
  } catch (Exception ex) {
    JOptionPane.showMessageDialog(this,
          "Couldn't read object: "
          + selected.getName() 
          + "\n" + ex.getMessage(),
          "Open object file",
          JOptionPane.ERROR_MESSAGE);
  }
      }

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      if (m_FileChooser == null) {
  createFileChooser();
      }
      int returnVal = m_FileChooser.showSaveDialog(this);
      if (returnVal == JFileChooser.APPROVE_OPTION) {
  File sFile = m_FileChooser.getSelectedFile();
  try {
    ObjectOutputStream oo = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(sFile)));
    oo.writeObject(object);
    oo.close();
  } catch (Exception ex) {
    JOptionPane.showMessageDialog(this,
          "Couldn't write to file: "
          + sFile.getName() 
          + "\n" + ex.getMessage(),
          "Save object",
          JOptionPane.ERROR_MESSAGE);
  }
      }

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    /**
     * Creates the file chooser the user will use to save/load files with.
     */
    protected void createFileChooser() {
      
      m_FileChooser = new JFileChooser(new File(System.getProperty("user.dir")));
      m_FileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
    }

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    super.setOptions(options);
    
    tmpStr = Utils.getOption("model", options);
    if (tmpStr.length() != 0)
      setModelFile(new File(tmpStr));
    else
      setModelFile(new File(System.getProperty("user.dir")));
  }

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                org.apache.synapse.config.xml.endpoints.TemplateFactory templateFactory =
                        new org.apache.synapse.config.xml.endpoints.TemplateFactory();


                Template tm = templateFactory.createEndpointTemplate(artifactConfig, properties);


                tm.setFileName(new File(fileName).getName());
                if (log.isDebugEnabled()) {
                    log.debug("Endpoint Template named '" + tm.getName()
                            + "' has been built from the file " + fileName);
                }


                getSynapseConfiguration().addEndpointTemplate(tm.getName(), tm);
                if (log.isDebugEnabled()) {
                    log.debug("Template Deployment from file : " + fileName + " : Completed");
                }
                log.info("Endpoint Template named '" + tm.getName()
                        + "' has been deployed from file : " + fileName);


                return tm.getName();
            } else {
                element = artifactConfig.getFirstChildWithName(
                        new QName(SynapseConstants.SYNAPSE_NAMESPACE, "sequence"));
                if (element != null) {
                    Mediator mediator = MediatorFactoryFinder.getInstance().
                            getMediator(artifactConfig, properties);
                    if (mediator instanceof TemplateMediator) {
                        TemplateMediator tm = (TemplateMediator) mediator;


                        tm.setFileName((new File(fileName)).getName());
                        if (log.isDebugEnabled()) {
                            log.debug("Sequence Template named '" + tm.getName()
                                    + "' has been built from the file " + fileName);
                        }

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