Example usage for java.nio.channels FileChannel transferFrom

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

  1. HOME
  2. Java
  3. java
  4. java.nio.channels.*
  5. FileChannel
  6. transferFrom

Introduction

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

Prototype

public abstract long transferFrom(ReadableByteChannel src, long position, long count) throws IOException;

Source Link

Document

Transfers bytes into this channel's file from the given readable byte channel.

Usage

From source file:com.cisco.dvbu.ps.common.util.CommonUtils.java

/**
 * The copyFile method is used to copy files from a source to a destination folder.
 * /* w w  w.  ja  v a 2 s . co m*/
 * @param fromFilePath
 * @param toFilePath
 * @throws ValidationException
 */
public static void copyFile(String fromFilePath, String toFilePath, boolean forceCopy)
        throws ValidationException {

    FileChannel srcChannel = null;
    FileChannel dstChannel = null;
    boolean fileExists = fileExists(toFilePath);

    if (forceCopy && fileExists) {
        removeFile(toFilePath);
        fileExists = fileExists(toFilePath);
    }

    if ((!fileExists) || (forceCopy && fileExists)) {
        try {
            // Create channel on the source
            srcChannel = new FileInputStream(fromFilePath).getChannel();

            // Create channel on the destination
            dstChannel = new FileOutputStream(toFilePath).getChannel();

            // Force the copy - added to overcome copy error
            dstChannel.force(true);

            // Copy file contents from source to destination
            dstChannel.transferFrom(srcChannel, 0, srcChannel.size());

        } catch (IOException e) {
            String message = "Could not copy file " + fromFilePath + ".An error was encountered: "
                    + e.toString();
            throw new ValidationException(message, e);
        } finally {
            try {
                // Close the channels
                if (srcChannel != null)
                    srcChannel.close();
                if (dstChannel != null)
                    dstChannel.close();
                srcChannel = null;
                dstChannel = null;
            } catch (IOException e) {
                String message = "Could not copy file " + fromFilePath
                        + ".  Error encountered while closing source and destination channels: " + e.toString();
                throw new ValidationException(message, e);
            }
        }
    }
}

From source file:com.example.util.FileUtils.java

/**
 * Internal copy file method./*from  w  w w  . j ava2  s. co  m*/
 * 
 * @param srcFile  the validated source file, must not be {@code null}
 * @param destFile  the validated destination file, must not be {@code null}
 * @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 > FILE_COPY_BUFFER_SIZE ? FILE_COPY_BUFFER_SIZE : size - pos;
            pos += output.transferFrom(input, pos, count);
        }
    } finally {
        IOUtils.closeQuietly(output);
        IOUtils.closeQuietly(fos);
        IOUtils.closeQuietly(input);
        IOUtils.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());
    }
}

From source file:org.sakaiproject.search.index.impl.JDBCClusterIndexStore.java

/**
 * @param packetStream//from w  w  w .  j  a  va 2  s.c  o m
 * @param sharedStream
 * @throws IOException
 */
private void doBlockedStream(FileChannel from, FileChannel to) throws IOException {
    to.position(0);
    long size = from.size();
    for (long pos = 0; pos < size;) {
        long count = size - pos;
        if (count > MAX_BLOCK_SIZE) {
            count = MAX_BLOCK_SIZE;

        }

        to.position(pos);
        long cpos = to.position();
        log.debug("NIOTransfering |" + count + "| bytes from |" + pos + "| to |" + cpos + "|");
        long t = to.transferFrom(from, pos, count);
        pos = pos + t;
    }
    log.debug("  Final Size Source        " + from.size());
    log.debug("  Final Size Destination   " + to.size());
}

From source file:com.matteoveroni.model.copy.FileUtils.java

/**
 * Internal copy file method.//from w ww.ja  v a2 s .c  o  m
 * 
 * @param srcFile  the validated source file, must not be {@code null}
 * @param destFile  the validated destination file, must not be {@code null}
 * @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 {
        bytesTransferedTotal = 0;
        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 > FILE_COPY_BUFFER_SIZE ? FILE_COPY_BUFFER_SIZE : size - pos;

            //pos += output.transferFrom(input, pos, count);

            //Split into into deceleration and assignment to count bytes transfered
            long bytesTransfered = output.transferFrom(input, pos, count);
            //complete original method
            pos += bytesTransfered;
            //update total bytes copied, so it can be used to calculate progress
            bytesTransferedTotal += bytesTransfered;
            System.out.println((int) Math.floor((100.0 / size) * bytesTransferedTotal) + "%");
        }
    } finally {
        IOUtils.closeQuietly(output);
        IOUtils.closeQuietly(fos);
        IOUtils.closeQuietly(input);
        IOUtils.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());
    }
}

From source file:com.ezac.gliderlogs.FlightOverviewActivity.java

@SuppressLint("SimpleDateFormat")
public void GliderLogToDB(String DBPath, String DB, String device) {
    // format date
    SimpleDateFormat TSD = new SimpleDateFormat("yyyyMMdd_kkss");
    SimpleDateFormat DIR = new SimpleDateFormat("yyyy/MM_dd");
    Date myDate = new Date();
    String backupDBPath = device + "_" + TSD.format(myDate);
    String TS_DIR = DIR.format(myDate);
    // to internal sdcard
    File dir = new File(Environment.getExternalStorageDirectory() + "/Download/" + TS_DIR);
    if (!dir.exists() || !dir.isDirectory()) {
        dir.mkdir();/*from   ww w  . j av a  2s .c o  m*/
    }
    File data = Environment.getDataDirectory();
    // create a file channel object
    FileChannel src = null;
    FileChannel des = null;
    File currentDB = new File(data + "/data/" + DBPath + "/databases/", DB);
    File backupDB = new File(dir, backupDBPath);
    try {
        backupDB.delete();
        src = new FileInputStream(currentDB).getChannel();
        des = new FileOutputStream(backupDB).getChannel();
        des.transferFrom(src, 0, src.size());
        src.close();
        des.close();
    } catch (IOException e) {
        Log.d(TAG, e.toString());
        e.printStackTrace();
    }
}

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   w w w .  j a  va 2s .  com*/
 *          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:com.zoffcc.applications.zanavi.Navit.java

private static void copyFile(File sourceFile, File destFile) throws IOException {
    if (!sourceFile.exists()) {
        return;//from  ww w  . ja  va 2 s.c om
    }
    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   ww w  .  j av a 2  s  .c  o 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 ww .  j a  v a 2  s.com
        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:com.clark.func.Functions.java

/**
 * Internal copy file method.//w  w  w  . ja  v  a  2 s. co  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());
    }
}