Example usage for java.nio.channels FileChannel size

List of usage examples for java.nio.channels FileChannel size

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Introduction

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

Prototype

public abstract long size() throws IOException;

Source Link

Document

Returns the current size of this channel's file.

Usage

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

/**
 * Copies a file as fast as possible. Tries to do a hardlink instead of a copy
 * if the hardlink parameter is specified.
 *
 * @param src//from ww w. jav  a 2  s.c  o m
 *          the source file for copying
 * @param dst
 *          the destination file for copying
 * @param hardlink
 *          whether or not to attempt a hardlink
 * @throws IOException
 */
public void copyFile(File src, File dst, boolean hardlink) throws IOException {

    if (src == null || dst == null) {
        throw new IOException("src/dst file is null");
    }

    try {
        if (hardlink && shouldHardLinkBlockCopy) {
            // Remove destination before hard linking, since this file might already
            // exist and a hardlink would fail as a result.
            if (dst.exists()) {
                if (!dst.delete()) {
                    throw new IOException("Deletion of file : " + dst + " failed");
                }
            }
            NativeIO.link(src, dst);
            DataNode.LOG.info("Hard Link Created from : " + src + " to " + dst);
            return;
        }
    } catch (IOException e) {
        DataNode.LOG
                .warn("Hard link failed from : " + src + " to " + dst + " continuing with regular file copy");
    }

    FileChannel input = null;
    FileChannel output = null;
    try {
        // This improves copying performance a lot, it uses native buffers
        // for copying.
        input = new FileInputStream(src).getChannel();
        output = new FileOutputStream(dst).getChannel();
        if (input == null || output == null) {
            throw new IOException("Could not create file channels for src : " + src + " dst : " + dst);
        }
        long bytesLeft = input.size();
        long position = 0;
        while (bytesLeft > 0) {
            long bytesWritten = output.transferFrom(input, position, bytesLeft);
            bytesLeft -= bytesWritten;
            position += bytesWritten;
        }
        if (datanode.syncOnClose) {
            output.force(true);
        }
    } finally {
        if (input != null) {
            input.close();
        }
        if (output != null) {
            output.close();
        }
    }
}

From source file:es.pode.publicacion.negocio.servicios.SrvPublicacionServiceImpl.java

/**
 * Mueve el contenido de un directorio a otro directorio.
 * // w w w . j  ava2  s.  com
 * @param oldDir
 *            Directorio origen.
 * @param newDir
 *            Directorio destino.
 * @return devuelve el tamanio del directorio movido.
 * @throws Exception
 * 
 */
protected Long handleMoveDir(File oldDir, File newDir) throws IOException {
    long longitudTransferida = 0;
    if (oldDir.isDirectory()) {
        newDir.mkdirs();
        String list[] = oldDir.list();

        for (int i = 0; i < list.length; i++) {
            String dest1 = newDir.getAbsolutePath() + "/" + list[i];
            String src1 = oldDir.getAbsolutePath() + "/" + list[i];
            longitudTransferida += handleMoveDir(new File(src1), new File(dest1)).longValue();
        }
    } else {
        FileInputStream fin = new FileInputStream(oldDir);
        FileOutputStream fos = new FileOutputStream(newDir);

        FileChannel sourceChannel = fin.getChannel();
        FileChannel targetChannel = fos.getChannel();
        longitudTransferida = sourceChannel.size();
        sourceChannel.transferTo(0, sourceChannel.size(), targetChannel);
        sourceChannel.close();
        targetChannel.close();
    }
    return new Long(longitudTransferida);
}

From source file:com.zoffcc.applications.zanavi.Navit.java

private static void copyFile(File sourceFile, File destFile) throws IOException {
    if (!sourceFile.exists()) {
        return;//  w w w .  ja  v a 2s. co m
    }
    if (!destFile.exists()) {
        destFile.createNewFile();
    }
    FileChannel source = null;
    FileChannel destination = null;
    source = new FileInputStream(sourceFile).getChannel();
    destination = new FileOutputStream(destFile).getChannel();
    if (destination != null && source != null) {
        destination.transferFrom(source, 0, source.size());
    }
    if (source != null) {
        source.close();
    }
    if (destination != null) {
        destination.close();
    }

}

From source file:com.zoffcc.applications.zanavi.Navit.java

private void import_map_points_from_sdcard() {
    String orig_file = NAVIT_DATA_SHARE_DIR + Navit_DEST_FILENAME;
    String dest_file_dir = CFG_FILENAME_PATH + "../export/";

    try {//from www  .ja  va  2  s  .co m
        File source = new File(dest_file_dir + Navit_DEST_FILENAME);
        File destination = new File(orig_file);

        if (source.exists()) {
            FileInputStream fi = new FileInputStream(source);
            FileOutputStream fo = new FileOutputStream(destination);
            FileChannel src = fi.getChannel();
            FileChannel dst = fo.getChannel();
            dst.transferFrom(src, 0, src.size());
            src.close();
            dst.close();
            fi.close();
            fo.close();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    read_map_points();
}

From source file:com.zoffcc.applications.zanavi.Navit.java

private void export_map_points_to_sdcard() {
    String orig_file = NAVIT_DATA_SHARE_DIR + Navit_DEST_FILENAME;
    String dest_file_dir = CFG_FILENAME_PATH + "../export/";

    try {/*w w w .  j  av a2  s .  c  o  m*/
        File dir = new File(dest_file_dir);
        dir.mkdirs();
    } catch (Exception e) {
        e.printStackTrace();
    }

    try {
        File source = new File(orig_file);
        File destination = new File(dest_file_dir + Navit_DEST_FILENAME);

        if (source.exists()) {
            FileInputStream fi = new FileInputStream(source);
            FileOutputStream fo = new FileOutputStream(destination);
            FileChannel src = fi.getChannel();
            FileChannel dst = fo.getChannel();
            dst.transferFrom(src, 0, src.size());
            src.close();
            dst.close();
            fi.close();
            fo.close();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

From source file:org.sakaiproject.assignment.tool.AssignmentAction.java

private byte[] readIntoBytes(InputStream zin, String fName, long length) throws IOException {

    byte[] buffer = new byte[4096];

    File f = File.createTempFile("asgnup", "tmp");

    FileOutputStream fout = new FileOutputStream(f);
    try {// ww w  .  ja  v  a2 s .  c  o m
        int len;
        while ((len = zin.read(buffer)) > 0) {
            fout.write(buffer, 0, len);
        }
        zin.close();
    } finally {
        try {
            fout.close(); // The file channel needs to be closed before the deletion.
        } catch (IOException ioException) {
            M_log.warn(this + "readIntoBytes: problem closing FileOutputStream " + ioException.getMessage());
        }
    }

    FileInputStream fis = new FileInputStream(f);
    FileChannel fc = fis.getChannel();
    byte[] data = null;
    try {
        data = new byte[(int) (fc.size())]; // fc.size returns the size of the file which backs the channel
        ByteBuffer bb = ByteBuffer.wrap(data);
        fc.read(bb);
    } finally {
        try {
            fc.close(); // The file channel needs to be closed before the deletion.
        } catch (IOException ioException) {
            M_log.warn(this + "readIntoBytes: problem closing FileChannel " + ioException.getMessage());
        }

        try {
            fis.close(); // The file inputstream needs to be closed before the deletion.
        } catch (IOException ioException) {
            M_log.warn(this + "readIntoBytes: problem closing FileInputStream " + ioException.getMessage());
        }
    }

    //remove the file
    f.delete();

    return data;
}

From source file:com.clark.func.Functions.java

/**
 * Internal copy file method./*from  w w w.ja  v  a  2s.  c  o m*/
 * 
 * @param srcFile
 *            the validated source file, must not be <code>null</code>
 * @param destFile
 *            the validated destination file, must not be <code>null</code>
 * @param preserveFileDate
 *            whether to preserve the file date
 * @throws IOException
 *             if an error occurs
 */
private static void doCopyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException {
    if (destFile.exists() && destFile.isDirectory()) {
        throw new IOException("Destination '" + destFile + "' exists but is a directory");
    }

    FileInputStream fis = null;
    FileOutputStream fos = null;
    FileChannel input = null;
    FileChannel output = null;
    try {
        fis = new FileInputStream(srcFile);
        fos = new FileOutputStream(destFile);
        input = fis.getChannel();
        output = fos.getChannel();
        long size = input.size();
        long pos = 0;
        long count = 0;
        while (pos < size) {
            count = (size - pos) > FIFTY_MB ? FIFTY_MB : (size - pos);
            pos += output.transferFrom(input, pos, count);
        }
    } finally {
        closeQuietly(output);
        closeQuietly(fos);
        closeQuietly(input);
        closeQuietly(fis);
    }

    if (srcFile.length() != destFile.length()) {
        throw new IOException("Failed to copy full contents from '" + srcFile + "' to '" + destFile + "'");
    }
    if (preserveFileDate) {
        destFile.setLastModified(srcFile.lastModified());
    }
}