Example usage for java.io File canWrite

Introduction

In this page you can find the example usage for java.io File canWrite.

Prototype

public boolean canWrite()

Source Link

Document

Tests whether the application can modify the file denoted by this abstract pathname.

Usage

From source file:FileCopy.java

/**
 * The static method that actually performs the file copy. Before copying the
 * file, however, it performs a lot of tests to make sure everything is as it
 * should be.//from w  w w  .j  a  v  a2 s  . c  o  m
 */
public static void copy(String from_name, String to_name) throws IOException {
    File from_file = new File(from_name); // Get File objects from Strings
    File to_file = new File(to_name);

    // First make sure the source file exists, is a file, and is readable.
    // These tests are also performed by the FileInputStream constructor
    // which throws a FileNotFoundException if they fail.
    if (!from_file.exists())
        abort("no such source file: " + from_name);
    if (!from_file.isFile())
        abort("can't copy directory: " + from_name);
    if (!from_file.canRead())
        abort("source file is unreadable: " + from_name);

    // If the destination is a directory, use the source file name
    // as the destination file name
    if (to_file.isDirectory())
        to_file = new File(to_file, from_file.getName());

    // If the destination exists, make sure it is a writeable file
    // and ask before overwriting it. If the destination doesn't
    // exist, make sure the directory exists and is writeable.
    if (to_file.exists()) {
        if (!to_file.canWrite())
            abort("destination file is unwriteable: " + to_name);
        // Ask whether to overwrite it
        System.out.print("Overwrite existing file " + to_file.getName() + "? (Y/N): ");
        System.out.flush();
        // Get the user's response.
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String response = in.readLine();
        // Check the response. If not a Yes, abort the copy.
        if (!response.equals("Y") && !response.equals("y"))
            abort("existing file was not overwritten.");
    } else {
        // If file doesn't exist, check if directory exists and is
        // writeable. If getParent() returns null, then the directory is
        // the current dir. so look up the user.dir system property to
        // find out what that is.
        String parent = to_file.getParent(); // The destination directory
        if (parent == null) // If none, use the current directory
            parent = System.getProperty("user.dir");
        File dir = new File(parent); // Convert it to a file.
        if (!dir.exists())
            abort("destination directory doesn't exist: " + parent);
        if (dir.isFile())
            abort("destination is not a directory: " + parent);
        if (!dir.canWrite())
            abort("destination directory is unwriteable: " + parent);
    }

    // If we've gotten this far, then everything is okay.
    // So we copy the file, a buffer of bytes at a time.
    FileInputStream from = null; // Stream to read from source
    FileOutputStream to = null; // Stream to write to destination
    try {
        from = new FileInputStream(from_file); // Create input stream
        to = new FileOutputStream(to_file); // Create output stream
        byte[] buffer = new byte[4096]; // To hold file contents
        int bytes_read; // How many bytes in buffer

        // Read a chunk of bytes into the buffer, then write them out,
        // looping until we reach the end of the file (when read() returns
        // -1). Note the combination of assignment and comparison in this
        // while loop. This is a common I/O programming idiom.
        while ((bytes_read = from.read(buffer)) != -1)
            // Read until EOF
            to.write(buffer, 0, bytes_read); // write
    }
    // Always close the streams, even if exceptions were thrown
    finally {
        if (from != null)
            try {
                from.close();
            } catch (IOException e) {
                ;
            }
        if (to != null)
            try {
                to.close();
            } catch (IOException e) {
                ;
            }
    }
}

From source file:com.frostwire.platform.DefaultFileSystem.java

@Override
public boolean canWrite(File file) {
    return file.canWrite();
}

From source file:com.orange.ocara.model.export.docx.DocxWriter.java

/**
 * To check a file. File must exists, be writeable
 *
 * @param file file to check//w ww  .ja  va2s.co m
 * @return true if ok, false otherwise
 */
private boolean checkFile(File file) {
    return file != null && file.exists() && file.canWrite() && file.isFile();
}

From source file:org.eclipse.gemini.blueprint.test.internal.util.FileSystemStorageTest.java

public void testResourceForTempFile() throws Exception {
    Resource res = storage.getResource();
    assertTrue(res.exists());/*from www. j a va2  s . c o m*/
    File tempFile = res.getFile();
    assertTrue(tempFile.exists());
    assertTrue(tempFile.canRead());
    assertTrue(tempFile.canWrite());
}

From source file:com.orange.ocara.model.export.docx.DocxWriter.java

/**
 * To check a directory. Directory must exists, be writeable.
 *
 * @param directory Directory to check// ww  w  . j a  va2 s  .co  m
 * @return true if ok, false otherwise
 */
private boolean checkDirectory(File directory) {
    return directory != null && directory.exists() && directory.canWrite() && directory.isDirectory();
}

From source file:com.qcadoo.plugin.internal.filemanager.DefaultPluginFileManager.java

private boolean checkFileRightsToWrite(final String pluginsPath) {
    File file = new File(pluginsPath);
    if (!file.exists() || !file.canWrite()) {
        return false;
    }//www .  j  a  v  a2  s.  c  om
    return true;
}

From source file:com.erudika.para.storage.LocalFileStore.java

@Override
public boolean delete(String path) {
    if (StringUtils.startsWith(path, File.separator)) {
        path = path.substring(1);// w ww.  j a  va  2  s.  c  o  m
    }
    if (!StringUtils.isBlank(path)) {
        File f = new File(folder + File.separator + path);
        return f.canWrite() && f.delete();
    }
    return false;
}

From source file:com.github.rnewson.couchdb.lucene.ConfigTest.java

@Test
public void testGetDir() {
    try {//from   w  w  w  .j av a 2 s. com
        final Config config = new Config();
        File dir = config.getDir();
        assertTrue(dir.exists());
        assertTrue(dir.canRead());
        assertTrue(dir.canWrite());
        assertEquals(new File("target", "indexes"), dir);
    } catch (ConfigurationException ce) {
        fail("ConfigurationException shouldn't have been thrown." + ce.getMessage());
    } catch (IOException ioe) {
        fail("IOException shouldn't have been thrown." + ioe.getMessage());
    }
}

From source file:com.jbrisbin.vpc.jobsched.patch.PatchMessageHandler.java

public void handleMessage(final PatchMessage msg) {

    if (null != msg.getFile()) {
        // Read original file
        List<String> original = new ArrayList<String>();
        File originalFile = new File(msg.getFile());
        try {//from w  w  w.  ja  v  a  2 s  .  co m
            BufferedReader reader = new BufferedReader(new FileReader(originalFile));
            String line = null;
            while (null != (line = reader.readLine())) {
                original.add(line);
            }
            reader.close();
        } catch (FileNotFoundException e) {
            log.error(e.getMessage(), e);
        } catch (IOException e) {
            log.error(e.getMessage(), e);
        }
        if (log.isDebugEnabled()) {
            log.debug("Patching original file: " + original);
        }

        // Patch it
        Patch patch = DiffUtils.parseUnifiedDiff(msg.getDiff());
        try {
            List<String> updated = (List<String>) DiffUtils.patch(original, patch);
            File tmp = File.createTempFile("patcher_", "patched");
            BufferedWriter writer = new BufferedWriter(new FileWriter(tmp));
            for (String line : updated) {
                writer.write(line + "\n");
            }
            writer.flush();
            writer.close();

            // Backup existing file
            File basedir = originalFile.getParentFile();
            if (basedir.canWrite()) {
                File backup = new File(originalFile.getParentFile(),
                        originalFile.getName() + ".bkp." + fmt.format(Calendar.getInstance().getTime()));
                originalFile.renameTo(backup);
                // Replace with patched version
                tmp.renameTo(originalFile);
            }

        } catch (PatchFailedException e) {
            log.error(e.getMessage(), e);
        } catch (IOException e) {
            log.error(e.getMessage(), e);
        }
    }

}

From source file:com.samir.commons.java.jarinstallerkit.jarinstaller.JarInstaller.java

public void starter(final String[] args) throws Exception {
    LOGGER.log(Level.INFO, "shutdown Previous");
    shutdownPrevious();// w  w w  .j  av a  2s  .c  om
    LOGGER.log(Level.INFO, "start disconnector Service");
    disconnectorService();
    File finalDir = new File(Constants.getInstallDirectorySeparator());
    if (finalDir.canWrite()) {
        doInstallLifeCycle(args);
    }
    //Remove the old tmp file
    try {
        File appTmp = new File(Constants.FINAL_APP_TMP);
        if (appTmp.exists()) {
            appTmp.delete();
        }
    } catch (Exception e) {
    }

}