Example usage for java.nio.channels FileChannel truncate

Introduction

In this page you can find the example usage for java.nio.channels FileChannel truncate.

Prototype

public abstract FileChannel truncate(long size) throws IOException;

Source Link

Document

Truncates this channel's file to the given size.

Usage

From source file:Main.java

public static long truncateFile(String fileName, long size) throws FileNotFoundException, IOException {
    RandomAccessFile raf = new RandomAccessFile(fileName, "rw");

    if (raf.length() >= size) {
        FileChannel channel = raf.getChannel();
        channel.truncate(size);
        return size;
    }//from  www. java  2 s. c o  m

    return raf.length();
}

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From source file:com.github.neoio.nio.util.NIOUtils.java

public static void resetFileChannel(FileChannel channel) throws NetIOException {
    try {/*w  w w  .j  a v  a  2 s  . com*/
        channel.position(0);
        channel.truncate(0);
    } catch (IOException e) {
        throw new NetIOException(e);
    }
}

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From source file:com.sakadream.sql.SQLConfigJson.java

/**
 * Save SQLConfig to config.json/*from  w  w w.j  a v  a2 s .c  om*/
 * @param sqlConfig SQLConfig object
 * @param encrypt Are you want to encrypt config.json?
 * @throws Exception
 */
public static void save(SQLConfig sqlConfig, Boolean encrypt) throws Exception {
    File file = new File(path);
    if (!file.exists()) {
        file.createNewFile();
    } else {
        FileChannel outChan = new FileOutputStream(file, true).getChannel();
        outChan.truncate(0);
        outChan.close();
    }
    FileWriter writer = new FileWriter(file);
    String json = gson.toJson(sqlConfig, type);
    if (encrypt) {
        Security security = new Security();
        writer.write(security.encrypt(json));
    } else {
        writer.write(json);
    }
    writer.close();
}

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From source file:com.sakadream.sql.SQLConfigJson.java

/**
 * Save SQLConfig to custom file name/*from   w  w  w  .  ja v  a  2 s .c  om*/
 * @param fileName SQLConfig file path
 * @param sqlConfig SQLConfig object
 * @param encrypt Are you want to encrypt config.json?
 * @throws Exception
 */
public static void save(String fileName, SQLConfig sqlConfig, Boolean encrypt) throws Exception {
    fileName = Utilis.changeFileName(fileName, "json");
    File file = new File(fileName);
    if (!file.exists()) {
        file.createNewFile();
    } else {
        FileChannel outChan = new FileOutputStream(file, true).getChannel();
        outChan.truncate(0);
        outChan.close();
    }
    FileWriter writer = new FileWriter(file);
    String json = gson.toJson(sqlConfig, type);
    if (encrypt) {
        Security security = new Security();
        writer.write(security.encrypt(json));
    } else {
        writer.write(json);
    }
    writer.close();
}

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From source file:graphene.util.fs.FileUtils.java

public static void truncateFile(final FileChannel fileChannel, final long position) throws IOException {
        int count = 0;
        boolean success = false;
        do {/*from  w  ww  .  j a va  2s. c  o  m*/
            count++;
            try {
                fileChannel.truncate(position);
                success = true;
            } catch (final IOException e) {
            }

        } while (!success && (count <= WINDOWS_RETRY_COUNT));
        if (!success) {
            throw new IOException("Failure to truncateFile " + fileChannel.toString());
        }
    }

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From source file:com.polyvi.xface.util.XFileUtils.java

/**
 * ?/*from w w  w  .j  av a2 s .  co m*/
 *
 * @param filePath
 *            ?
 * @param size
 *            size?
 * @return 
 */
public static long truncateFile(String fileName, long size) throws FileNotFoundException, IOException {
    RandomAccessFile raf = new RandomAccessFile(fileName, "rw");

    if (raf.length() >= size) {
        FileChannel channel = raf.getChannel();
        channel.truncate(size);
        return size;
    }

    return raf.length();
}

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From source file:org.apache.hadoop.hdfs.server.datanode.TestDirectoryScannerInlineFiles.java

private void truncateFile(File f) throws IOException {
    assertTrue(f.exists() && f.length() != 0);
    FileOutputStream s = new FileOutputStream(f);
    FileChannel channel = s.getChannel();
    channel.truncate(0);
    LOG.info("Truncated block file " + f.getAbsolutePath());
    s.close();//ww  w .  j a v  a 2  s.c  o m
}

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From source file:org.apache.usergrid.chop.runner.drivers.ResultsLog.java

@Override
public void truncate() throws IOException {
    if (isOpen.get()) {
        throw new IOException("Cannot truncate while log is open for writing. Close the log then truncate.");
    }// w  w w.j av a2 s.co m

    // Synchronize on isOpen to prevent re-opening while truncating (rare)
    synchronized (isOpen) {
        File results = new File(resultsFile.get());
        FileChannel channel = new FileOutputStream(results, true).getChannel();
        channel.truncate(0);
        channel.close();
        resultCount.set(0);
    }
}

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From source file:org.apache.hadoop.hdfs.tools.offlineEditsViewer.TestOfflineEditsViewer.java

@Test
public void testRecoveryMode() throws IOException {
    // edits generated by nnHelper (MiniDFSCluster), should have all op codes
    // binary, XML, reparsed binary
    String edits = nnHelper.generateEdits();
    FileOutputStream os = new FileOutputStream(edits, true);
    // Corrupt the file by truncating the end
    FileChannel editsFile = os.getChannel();
    editsFile.truncate(editsFile.size() - 5);

    String editsParsedXml = folder.newFile("editsRecoveredParsed.xml").getAbsolutePath();
    String editsReparsed = folder.newFile("editsRecoveredReparsed").getAbsolutePath();
    String editsParsedXml2 = folder.newFile("editsRecoveredParsed2.xml").getAbsolutePath();

    // Can't read the corrupted file without recovery mode
    assertEquals(-1, runOev(edits, editsParsedXml, "xml", false));

    // parse to XML then back to binary
    assertEquals(0, runOev(edits, editsParsedXml, "xml", true));
    assertEquals(0, runOev(editsParsedXml, editsReparsed, "binary", false));
    assertEquals(0, runOev(editsReparsed, editsParsedXml2, "xml", false));

    // judgment time
    assertTrue("Test round trip",
            FileUtils.contentEqualsIgnoreEOL(new File(editsParsedXml), new File(editsParsedXml2), "UTF-8"));

    os.close();/*from ww  w . ja  va2 s  . co  m*/
}

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From source file:gov.nih.nci.firebird.selenium2.framework.AbstractFirebirdWebDriverTest.java

private void truncateJbossLog() throws IOException {
    FileChannel outChan = new FileOutputStream(serverLog, true).getChannel();
    outChan.truncate(0);
    outChan.close();/*from   ww  w.j a v a  2s  .  co m*/
}

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