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

    long thID = Thread.currentThread().getId();
    long CPUStartTime=-1, trainCPUTimeElapsed=-1, testCPUTimeElapsed=-1,
         trainTimeStart, trainTimeElapsed, testTimeStart, testTimeElapsed;    
    
    String costName = train.relationName() + CostMatrix.FILE_EXTENSION;
    File costFile = new File(getOnDemandDirectory(), costName);
    if (!costFile.exists()) {
      throw new Exception("On-demand cost file doesn't exist: " + costFile);
    }
    CostMatrix costMatrix = new CostMatrix(new BufferedReader(
    new FileReader(costFile)));

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  }


  protected void setupFileChooser() {
    if (m_fileChooser == null) {
      m_fileChooser = 
        new JFileChooser(new File(System.getProperty("user.dir")));
    }


    m_fileChooser.addChoosableFileFilter(m_binaryFilter);
    if (KOML.isPresent()) {
      m_fileChooser.addChoosableFileFilter(m_KOMLFilter);

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        // i.e. after de-serialization
        setupFileChooser();
      }
      int returnVal = m_fileChooser.showOpenDialog(this);
      if (returnVal == JFileChooser.APPROVE_OPTION) {
        File loadFrom = m_fileChooser.getSelectedFile();


        // add extension if necessary
        if (m_fileChooser.getFileFilter() == m_binaryFilter) {
          if (!loadFrom.getName().toLowerCase().endsWith("." + FILE_EXTENSION)) {
            loadFrom = new File(loadFrom.getParent(),
                                loadFrom.getName() + "." + FILE_EXTENSION);
          }
        } else if (m_fileChooser.getFileFilter() == m_KOMLFilter) {
          if (!loadFrom.getName().toLowerCase().endsWith(KOML.FILE_EXTENSION 
                                                         + FILE_EXTENSION)) {
            loadFrom = new File(loadFrom.getParent(),
                                loadFrom.getName() + KOML.FILE_EXTENSION 
                                + FILE_EXTENSION);
          }
        } else if (m_fileChooser.getFileFilter() == m_XStreamFilter) {
          if (!loadFrom.getName().toLowerCase().endsWith(XStream.FILE_EXTENSION 
                                                        + FILE_EXTENSION)) {
            loadFrom = new File(loadFrom.getParent(),
                                loadFrom.getName() + XStream.FILE_EXTENSION 
                                + FILE_EXTENSION);
          }
        }


        weka.classifiers.Classifier temp = null;
        Instances tempHeader = null;
        // KOML ?
        if ((KOML.isPresent()) &&
            (loadFrom.getAbsolutePath().toLowerCase().
             endsWith(KOML.FILE_EXTENSION + FILE_EXTENSION))) {
          Vector v = (Vector) KOML.read(loadFrom.getAbsolutePath());
          temp = (weka.classifiers.Classifier) v.elementAt(0);
          if (v.size() == 2) {
            // try and grab the header
            tempHeader = (Instances) v.elementAt(1);
          }
        } /* XStream */ else if ((XStream.isPresent()) &&
                                 (loadFrom.getAbsolutePath().toLowerCase().
                                  endsWith(XStream.FILE_EXTENSION + FILE_EXTENSION))) {
          Vector v = (Vector) XStream.read(loadFrom.getAbsolutePath());
          temp = (weka.classifiers.Classifier) v.elementAt(0);
          if (v.size() == 2) {
            // try and grab the header
            tempHeader = (Instances) v.elementAt(1);
          }

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        // i.e. after de-serialization
        setupFileChooser();
      }
      int returnVal = m_fileChooser.showSaveDialog(this);
      if (returnVal == JFileChooser.APPROVE_OPTION) {
        File saveTo = m_fileChooser.getSelectedFile();
        String fn = saveTo.getAbsolutePath();
        if (m_fileChooser.getFileFilter() == m_binaryFilter) {
          if (!fn.toLowerCase().endsWith("." + FILE_EXTENSION)) {
            fn += "." + FILE_EXTENSION;
          }
        } else if (m_fileChooser.getFileFilter() == m_KOMLFilter) {
          if (!fn.toLowerCase().endsWith(KOML.FILE_EXTENSION + FILE_EXTENSION)) {
            fn += KOML.FILE_EXTENSION + FILE_EXTENSION;
          }
        } else if (m_fileChooser.getFileFilter() == m_XStreamFilter) {
          if (!fn.toLowerCase().endsWith(XStream.FILE_EXTENSION + FILE_EXTENSION)) {
            fn += XStream.FILE_EXTENSION + FILE_EXTENSION;
          }
        }
        saveTo = new File(fn);


        // now serialize model
        // KOML?
        if ((KOML.isPresent()) &&
            saveTo.getAbsolutePath().toLowerCase().
            endsWith(KOML.FILE_EXTENSION + FILE_EXTENSION)) {
          SerializedModelSaver.saveKOML(saveTo,
                                        m_Classifier,
                                        (m_trainingSet != null)
                                        ? new Instances(m_trainingSet, 0)
                                        : null);
          /*          Vector v = new Vector();
          v.add(m_Classifier);
          if (m_trainingSet != null) {
            v.add(new Instances(m_trainingSet, 0));
          }
          v.trimToSize();
          KOML.write(saveTo.getAbsolutePath(), v); */
        } /* XStream */ else if ((XStream.isPresent()) &&
                                 saveTo.getAbsolutePath().toLowerCase().
            endsWith(XStream.FILE_EXTENSION + FILE_EXTENSION)) {


          SerializedModelSaver.saveXStream(saveTo,
                                           m_Classifier,
                                           (m_trainingSet != null)

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  public FileEnvironmentField(String label) {
    super(label);
    
    m_fileEditor.addPropertyChangeListener(new PropertyChangeListener() {
      public void propertyChange(PropertyChangeEvent evt) {
        File selected = (File)m_fileEditor.getValue();
        if (selected != null) {
          FileEnvironmentField.this.setText(selected.toString());
        }        
      }
    });
    
    final JFileChooser embeddedEditor = (JFileChooser)m_fileEditor.getCustomEditor();
    embeddedEditor.setFileSelectionMode(JFileChooser.FILES_ONLY);
    ExtensionFileFilter ff =
      new ExtensionFileFilter(".model", "Serialized Weka classifier (*.model)");
    embeddedEditor.addChoosableFileFilter(ff);    
    
    m_browseBut = new JButton("Browse...");
    m_browseBut.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        try {
          String modelPath = getText();
          if (modelPath != null) {
            try {
              modelPath = m_env.substitute(modelPath);
            } catch (Exception ex) {              
            }
            
            File toSet = new File(modelPath);            
            if (toSet.isFile()) {
              m_fileEditor.setValue(new File(modelPath));
              toSet = toSet.getParentFile();              
            }
            if (toSet.isDirectory()) {
              embeddedEditor.setCurrentDirectory(toSet);
            }
          }
          
          showFileEditor();

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    /**
     * Start the standalone (in process) database.
     */
    private void startStandaloneDatabase() throws Exception
    {
        final File h2Dir = checkDataDir() ;
               
        dbPath = new File(h2Dir, name);
        
        final String dbURL = JDBC_URL_PREFIX + dbPath.toURI().toString() + flags ;
        log.info(dbURL);
        
        // Check we have connectivity

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     * Start a remote/server database
     * @throws Exception
     */
    private void startRemoteDatabase() throws Exception
    {
        final File h2Dir = checkDataDir() ;
        dbPath = new File(h2Dir, name);
       
        // Start DB in new thread, or else it will block us
        serverThread = new Thread("h2-" + name)
        {
            public void run()

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     * @throws IOException For errors checking/creating the h2 data directory.
     */
    private File checkDataDir() throws IOException
    {
        // Get the server data directory
        final File dataDir = getDataDir();


        // Get DB directory
        final File h2Dir = new File(dataDir, H2_DATA_DIR);


        if (!h2Dir.exists())
        {
            h2Dir.mkdirs();
        }
        else if (!h2Dir.isDirectory())
        {
            throw new IOException("Failed to create directory: " + h2Dir);
        }
        return h2Dir ;
    }

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            //return serverConfig.getServerDataDir();
          org.jboss.soa.dsp.server.ServerConfig serverConfig=
            org.jboss.soa.bpel.runtime.JBossDSPFactory.getServerConfig();
          return(serverConfig.getServerDeployDir());
        }
        return new File(datadir);
    }

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    String szSuffix = "JPG";
    if (szFile.contains(".")) {
      int nSuffix = szFile.lastIndexOf('.');
      szSuffix = szFile.substring(nSuffix + 1);
    }
    File f = new File(szFile);
    try {
      ImageIO.write(im, szSuffix, f);
    } catch (IOException ex) {
      
    }

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