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.mitre.ccv.mapred.GenerateFeatureVectors.java

/**
 * Returns a read only {@link MappedByteBuffer}.
 * //  w w w  .  ja  v a  2s . c  o m
 * @param input full <b>local</b>  path 
 * @throws java.io.IOException
 */
public static MappedByteBuffer getMappedByteBuffer(String input) throws IOException {
    FileInputStream fins = new FileInputStream(input);
    FileChannel channel = fins.getChannel();
    return channel.map(FileChannel.MapMode.READ_ONLY, 0, (int) channel.size());
}

From source file:Main.java

public static File copyFileTo(File src, File dst) {
    FileChannel in = null;
    FileChannel out = null;//ww w . ja v a2 s  .c  om
    FileInputStream inStream = null;
    FileOutputStream outStream = null;
    try {
        inStream = new FileInputStream(src);
        outStream = new FileOutputStream(dst);
        in = inStream.getChannel();
        out = outStream.getChannel();
        in.transferTo(0, in.size(), out);
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    } finally {
        try {
            if (in != null) {
                in.close();
            }
            if (out != null) {
                out.close();
            }
            if (inStream != null) {
                inStream.close();
            }
            if (outStream != null) {
                outStream.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return dst;
}

From source file:org.wso2.carbon.esb.vfs.transport.test.ESBJAVA3470.java

/**
 * Copy the given source file to the given destination
 *
 * @param sourceFile/*from w  w w . j  a  v a2 s .  c  om*/
 *                 source file
 * @param destFile
 *                 destination file
 * @throws IOException
 */
public static void copyFile(File sourceFile, File destFile) throws IOException {
    if (!destFile.exists()) {
        destFile.createNewFile();
    }
    FileInputStream fileInputStream = null;
    FileOutputStream fileOutputStream = null;

    try {
        fileInputStream = new FileInputStream(sourceFile);
        fileOutputStream = new FileOutputStream(destFile);

        FileChannel source = fileInputStream.getChannel();
        FileChannel destination = fileOutputStream.getChannel();
        destination.transferFrom(source, 0, source.size());
    } finally {
        IOUtils.closeQuietly(fileInputStream);
        IOUtils.closeQuietly(fileOutputStream);
    }
}

From source file:org.easysoa.registry.frascati.FileUtils.java

/**
 * Copy a file in an other file//  ww  w.ja  v  a2  s .c o m
 * 
 * @param source The source file
 * @param target The target file
 * @throws Exception If a problem occurs
 */
public static final void copyTo(File source, File target) throws Exception {
    if (source == null || target == null) {
        throw new IllegalArgumentException("Source and target files must not be null");
    }
    // Input and outputs channels
    log.debug("source file = " + source);
    log.debug("target file = " + target);
    FileChannel in = null;
    FileChannel out = null;
    try {
        // Init
        in = new FileInputStream(source).getChannel();
        out = new FileOutputStream(target).getChannel();
        // File copy
        in.transferTo(0, in.size(), out);
    } catch (Exception ex) {
        throw ex;
    } finally {
        // finally close all streams
        if (in != null) {
            try {
                in.close();
            } catch (IOException e) {
            }
        }
        if (out != null) {
            try {
                out.close();
            } catch (IOException e) {
            }
        }
    }
}

From source file:Main.java

public static void fastFileCopy(File source, File target) {
    FileChannel in = null;
    FileChannel out = null;/* w ww  . jav  a2  s . c o m*/
    long start = System.currentTimeMillis();
    FileInputStream fis = null;
    FileOutputStream fos = null;
    try {
        fis = new FileInputStream(source);
        in = fis.getChannel();
        fos = new FileOutputStream(target);
        out = fos.getChannel();

        long size = in.size();
        long transferred = in.transferTo(0, size, out);

        while (transferred != size) {
            transferred += in.transferTo(transferred, size - transferred, out);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        close(fis);
        close(fos);
        close(in);
        close(out);
    }
    long end = System.currentTimeMillis();

    Log.d(target.getAbsolutePath(), nf.format(source.length()) + "B: "
            + ((end - start > 0) ? nf.format(source.length() / (end - start)) : 0) + " KB/s");
}

From source file:dk.netarkivet.common.utils.StreamUtils.java

/**
 * Will copy everything from input stream to output stream, closing input
 * stream afterwards./*from w ww. j av a2  s  . co m*/
 *
 * @param in  Inputstream to copy from
 * @param out Outputstream to copy to
 * @throws ArgumentNotValid if either parameter is null
 * @throws IOFailure if a read or write error happens during copy
 */
public static void copyInputStreamToOutputStream(InputStream in, OutputStream out) {
    ArgumentNotValid.checkNotNull(in, "InputStream in");
    ArgumentNotValid.checkNotNull(out, "OutputStream out");

    try {
        try {
            if (in instanceof FileInputStream && out instanceof FileOutputStream) {
                FileChannel inChannel = ((FileInputStream) in).getChannel();
                FileChannel outChannel = ((FileOutputStream) out).getChannel();
                long transferred = 0;
                final long fileLength = inChannel.size();
                do {
                    transferred += inChannel.transferTo(transferred,
                            Math.min(Constants.IO_CHUNK_SIZE, fileLength - transferred), outChannel);
                } while (transferred < fileLength);
            } else {
                byte[] buf = new byte[Constants.IO_BUFFER_SIZE];
                int bytesRead;
                while ((bytesRead = in.read(buf)) != -1) {
                    out.write(buf, 0, bytesRead);
                }
            }
            out.flush();
        } finally {
            in.close();
        }
    } catch (IOException e) {
        String errMsg = "Trouble copying inputstream " + in + " to outputstream " + out;
        log.warn(errMsg, e);
        throw new IOFailure(errMsg, e);
    }
}

From source file:ValidateLicenseHeaders.java

/**
 * Add the default jboss lgpl header//from  w  w w .j a v  a  2  s  .  co  m
 */
static void addDefaultHeader(File javaFile) throws IOException {
    if (addDefaultHeader) {
        FileInputStream fis = new FileInputStream(javaFile);
        FileChannel fc = fis.getChannel();
        int size = (int) fc.size();
        ByteBuffer contents = ByteBuffer.allocate(size);
        fc.read(contents);
        fis.close();

        ByteBuffer hdr = ByteBuffer.wrap(DEFAULT_HEADER.getBytes());
        FileOutputStream fos = new FileOutputStream(javaFile);
        fos.write(hdr.array());
        fos.write(contents.array());
        fos.close();
    }

    noheaders.add(javaFile);
}

From source file:com.twentyoneechoes.borges.util.Utils.java

public static void backupDatabase(Context ctx) {
    try {/*  w  w w  .j  av  a 2  s .c  om*/
        File sd = Environment.getExternalStorageDirectory();
        File data = Environment.getDataDirectory();

        if (sd.canWrite()) {
            String currentDBPath = "//data//" + ctx.getApplicationContext().getPackageName()
                    + "//databases//borges.db";
            String backupDBPath = "borges.db";
            File currentDB = new File(data, currentDBPath);
            File backupDB = new File(sd, backupDBPath);

            if (currentDB.exists()) {
                FileChannel src = new FileInputStream(currentDB).getChannel();
                FileChannel dst = new FileOutputStream(backupDB).getChannel();
                dst.transferFrom(src, 0, src.size());
                src.close();
                dst.close();
            }
        }
    } catch (Exception e) {
        Log.i(Utils.class.getSimpleName(), "Unable to backup database");
    }
}

From source file:org.apache.hadoop.hdfs.server.namenode.TestFSEditLogLoader.java

/**
 * Return the length of bytes in the given file after subtracting
 * the trailer of 0xFF (OP_INVALID)s.//  ww w .  j a v  a  2  s  . com
 * This seeks to the end of the file and reads chunks backwards until
 * it finds a non-0xFF byte.
 * @throws IOException if the file cannot be read
 */
private static long getNonTrailerLength(File f) throws IOException {
    final int chunkSizeToRead = 256 * 1024;
    FileInputStream fis = new FileInputStream(f);
    try {

        byte buf[] = new byte[chunkSizeToRead];

        FileChannel fc = fis.getChannel();
        long size = fc.size();
        long pos = size - (size % chunkSizeToRead);

        while (pos >= 0) {
            fc.position(pos);

            int readLen = (int) Math.min(size - pos, chunkSizeToRead);
            IOUtils.readFully(fis, buf, 0, readLen);
            for (int i = readLen - 1; i >= 0; i--) {
                if (buf[i] != FSEditLogOpCodes.OP_INVALID.getOpCode()) {
                    return pos + i + 1; // + 1 since we count this byte!
                }
            }

            pos -= chunkSizeToRead;
        }
        return 0;
    } finally {
        fis.close();
    }
}

From source file:org.codehaus.preon.Codecs.java

public static <T> T decode(Codec<T> codec, Builder builder, File file)
        throws FileNotFoundException, IOException, DecodingException {
    FileInputStream in = null;//from  w w  w .j a  v a2 s.c o m
    FileChannel channel = null;
    try {
        in = new FileInputStream(file);
        channel = in.getChannel();
        int fileSize = (int) channel.size();
        ByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, fileSize);
        return decode(codec, buffer, builder);
    } finally {
        if (channel != null) {
            channel.close();
        }
    }
}