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:net.librec.util.FileUtil.java

/**
 * fast file copy//from w w w. j ava  2s.co m
 *
 * @param source source file
 * @param target target file
 * @throws Exception if error occurs
 */
public static void copyFile(File source, File target) throws Exception {

    FileInputStream fis = new FileInputStream(source);
    FileOutputStream fos = new FileOutputStream(target);
    FileChannel inChannel = fis.getChannel();
    FileChannel outChannel = fos.getChannel();

    // inChannel.transferTo(0, inChannel.size(), outChannel);
    // original -- apparently has trouble copying large files on Windows

    // magic number for Windows, 64Mb - 32Kb
    int maxCount = (64 * 1024 * 1024) - (32 * 1024);
    long size = inChannel.size();
    long position = 0;
    while (position < size) {
        position += inChannel.transferTo(position, maxCount, outChannel);
    }

    inChannel.close();
    outChannel.close();
    fis.close();
    fos.close();
}

From source file:org.squidy.designer.components.pdf.PDFPane.java

public PDFPane(String pdfFileLoc) {
    super();//  ww w  .  j  a v a  2 s  .c  om
    try {
        // load a pdf from a byte buffer
        File file = new File(pdfFileLoc);
        RandomAccessFile raf = new RandomAccessFile(file, "r");
        FileChannel channel = raf.getChannel();
        ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
        PDFFile pdffile = new PDFFile(buf);
        pdfComponents = new PagePanel[pdffile.getNumPages()];
        pageHeight = (int) pdffile.getPage(0).getHeight() + 3;
        pageWidth = (int) pdffile.getPage(0).getWidth() + 1;

        for (int i = 0; i < pdfComponents.length; i++) {
            PagePanel p = new PagePanel();
            p.setBackground(Color.BLACK);
            p.setPreferredSize(new Dimension(pageWidth, pageHeight));
            PSwing ps = new PSwing(p);

            ps.setOffset(0, i * pageHeight);
            addChild(ps);
            p.showPage(pdffile.getPage(i));
        }
    } catch (IOException e) {
        if (LOG.isErrorEnabled()) {
            LOG.error("Error in " + PDFPane.class.getName() + ".", e);
        }
        System.out.println(e.getMessage());
    }
}

From source file:org.ros.internal.message.new_style.ServiceLoader.java

private void addServiceDefinitionFromPaths(File searchPath, File servicePath, CharsetDecoder decoder)
        throws IOException {
    FileInputStream inputStream = new FileInputStream(servicePath);
    FileChannel channel = inputStream.getChannel();
    ByteBuffer buffer = ByteBuffer.allocate((int) channel.size());
    channel.read(buffer);/*from  ww w  . j a v  a 2s .com*/
    buffer.rewind();
    decoder.reset();
    String definition = decoder.decode(buffer).toString().trim();
    serviceDefinitions.put(pathToServiceName(searchPath, servicePath), definition);
    channel.close();
    inputStream.close();
}

From source file:org.lnicholls.galleon.util.Tools.java

public static InputStream getInputStream(File file) {
    try {/*from   w ww . j  ava  2 s.c o  m*/
        FileChannel roChannel = new RandomAccessFile(file, "r").getChannel();
        final ByteBuffer buf = roChannel.map(FileChannel.MapMode.READ_ONLY, 0, (int) roChannel.size());
        return new InputStream() {
            public synchronized int read() throws IOException {
                if (!buf.hasRemaining()) {
                    return -1;
                }
                return buf.get();
            }

            public synchronized int read(byte[] bytes, int off, int len) throws IOException {
                if (!buf.hasRemaining()) {
                    return -1;
                }
                len = Math.min(len, buf.remaining());
                buf.get(bytes, off, len);
                return len;
            }
        };
    } catch (Exception ex) {
        Tools.logException(Tools.class, ex, file.getAbsolutePath());
    }
    return null;
}

From source file:org.ros.internal.message.new_style.MessageLoader.java

private void addMessageDefinitionFromPaths(File searchPath, File messagePath, CharsetDecoder decoder)
        throws IOException {
    FileInputStream inputStream = new FileInputStream(messagePath);
    FileChannel channel = inputStream.getChannel();
    ByteBuffer buffer = ByteBuffer.allocate((int) channel.size());
    channel.read(buffer);//from  w  w w .  j ava 2s .c  o m
    buffer.rewind();
    decoder.reset();
    String definition = decoder.decode(buffer).toString().trim();
    messageDefinitions.put(pathToMessageName(searchPath, messagePath), definition);
    channel.close();
    inputStream.close();
}

From source file:ome.services.blitz.repo.RepoRawFileStoreI.java

public void truncate_async(AMD_RawFileStore_truncate __cb, long length, Current __current) throws ServerError {

    if (true) {//from   w  ww . j ava  2  s  .co  m
        // See ticket:2562
        __cb.ice_exception(new omero.ApiUsageException(null, null, "Currently disabled."));
        return;
    }

    try {
        FileChannel fc = this.rafile.getChannel();
        if (fc.size() < length) {
            __cb.ice_response(false);
        } else {
            this.rafile.getChannel().truncate(length);
            __cb.ice_response(true);
        }
    } catch (Throwable t) {
        __cb.ice_exception(convert(t));
    }
}

From source file:org.lnicholls.galleon.util.Tools.java

public static BufferedImage ImageIORead(File file) {
    System.gc();//from w  w  w .  j a v  a2 s.  c o  m
    try {
        FileChannel roChannel = new RandomAccessFile(file, "r").getChannel();
        final ByteBuffer buf = roChannel.map(FileChannel.MapMode.READ_ONLY, 0, (int) roChannel.size());
        return ImageIO.read(new InputStream() {
            public synchronized int read() throws IOException {
                if (!buf.hasRemaining()) {
                    return -1;
                }
                return buf.get();
            }

            public synchronized int read(byte[] bytes, int off, int len) throws IOException {
                if (!buf.hasRemaining()) {
                    return -1;
                }
                len = Math.min(len, buf.remaining());
                buf.get(bytes, off, len);
                return len;
            }
        });
    } catch (Exception ex) {
        Tools.logException(Tools.class, ex, file.getAbsolutePath());
    }

    try {
        return ImageIO.read(new FileInputStream(file));
    } catch (Exception ex) {
        Tools.logException(Tools.class, ex, file.getAbsolutePath());
    }
    return null;
}

From source file:Main.java

public static long findCentralDirStartOffset(final FileChannel fileChannel, final long commentLength)
        throws IOException {
    // End of central directory record (EOCD)
    // Offset    Bytes     Description[23]
    // 0           4       End of central directory signature = 0x06054b50
    // 4           2       Number of this disk
    // 6           2       Disk where central directory starts
    // 8           2       Number of central directory records on this disk
    // 10          2       Total number of central directory records
    // 12          4       Size of central directory (bytes)
    // 16          4       Offset of start of central directory, relative to start of archive
    // 20          2       Comment length (n)
    // 22          n       Comment
    // For a zip with no archive comment, the
    // end-of-central-directory record will be 22 bytes long, so
    // we expect to find the EOCD marker 22 bytes from the end.

    final ByteBuffer zipCentralDirectoryStart = ByteBuffer.allocate(4);
    zipCentralDirectoryStart.order(ByteOrder.LITTLE_ENDIAN);
    fileChannel.position(fileChannel.size() - commentLength - 6); // 6 = 2 (Comment length) + 4 (Offset of start of central directory, relative to start of archive)
    fileChannel.read(zipCentralDirectoryStart);
    final long centralDirStartOffset = zipCentralDirectoryStart.getInt(0);
    return centralDirStartOffset;
}

From source file:com.highcharts.export.util.SVGCreator.java

private String readFile(String path) throws IOException {
    FileInputStream stream = new FileInputStream(new File(path));
    try {/*w w w.j  a v a  2s  .  c o  m*/
        FileChannel fc = stream.getChannel();
        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
        /* Instead of using default, pass in a decoder. */
        return Charset.forName("utf-8").decode(bb).toString();
    } finally {
        stream.close();
    }
}

From source file:org.apache.nifi.file.FileUtils.java

public static long copyFile(final File source, final OutputStream stream, final boolean closeOutputStream,
        final boolean lockInputFile) throws FileNotFoundException, IOException {
    FileInputStream fis = null;// www  . j  a va  2  s .  c  o  m
    FileLock inLock = null;
    long fileSize = 0L;
    try {
        fis = new FileInputStream(source);
        final FileChannel in = fis.getChannel();
        if (lockInputFile) {
            inLock = in.tryLock(0, Long.MAX_VALUE, true);
            if (inLock == null) {
                throw new IOException("Unable to obtain exclusive file lock for: " + source.getAbsolutePath());
            }

        }

        byte[] buffer = new byte[1 << 18]; //256 KB
        int bytesRead = -1;
        while ((bytesRead = fis.read(buffer)) != -1) {
            stream.write(buffer, 0, bytesRead);
        }
        in.force(false);
        stream.flush();
        fileSize = in.size();
    } finally {
        FileUtils.releaseQuietly(inLock);
        FileUtils.closeQuietly(fis);
        if (closeOutputStream) {
            FileUtils.closeQuietly(stream);
        }
    }
    return fileSize;
}