Example usage for java.io RandomAccessFile getChannel

Introduction

In this page you can find the example usage for java.io RandomAccessFile getChannel.

Prototype

public final FileChannel getChannel() 

Source Link

Document

Returns the unique java.nio.channels.FileChannel FileChannel object associated with this file.

Usage

From source file:com.gsbabil.antitaintdroid.UtilityFunctions.java

/**
 * Source:/*from   w ww  . j  a v  a 2s .c o  m*/
 * http://stackoverflow.com/questions/4349075/bitmapfactory-decoderesource
 * -returns-a-mutable-bitmap-in-android-2-2-and-an-immu
 * 
 * Converts a immutable bitmap to a mutable bitmap. This operation doesn't
 * allocates more memory that there is already allocated.
 * 
 * @param imgIn
 *            - Source image. It will be released, and should not be used
 *            more
 * @return a copy of imgIn, but immutable.
 */
public static Bitmap convertBitmapToMutable(Bitmap imgIn) {
    try {
        // this is the file going to use temporally to save the bytes.
        // This file will not be a image, it will store the raw image data.
        File file = new File(MyApp.context.getFilesDir() + File.separator + "temp.tmp");

        // Open an RandomAccessFile
        // Make sure you have added uses-permission
        // android:name="android.permission.WRITE_EXTERNAL_STORAGE"
        // into AndroidManifest.xml file
        RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw");

        // get the width and height of the source bitmap.
        int width = imgIn.getWidth();
        int height = imgIn.getHeight();
        Config type = imgIn.getConfig();

        // Copy the byte to the file
        // Assume source bitmap loaded using options.inPreferredConfig =
        // Config.ARGB_8888;
        FileChannel channel = randomAccessFile.getChannel();
        MappedByteBuffer map = channel.map(MapMode.READ_WRITE, 0, imgIn.getRowBytes() * height);
        imgIn.copyPixelsToBuffer(map);
        // recycle the source bitmap, this will be no longer used.
        imgIn.recycle();
        System.gc();// try to force the bytes from the imgIn to be released

        // Create a new bitmap to load the bitmap again. Probably the memory
        // will be available.
        imgIn = Bitmap.createBitmap(width, height, type);
        map.position(0);
        // load it back from temporary
        imgIn.copyPixelsFromBuffer(map);
        // close the temporary file and channel , then delete that also
        channel.close();
        randomAccessFile.close();

        // delete the temporary file
        file.delete();

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return imgIn;
}

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From source file:com.adaptris.fs.NioWorkerTest.java

@Test
public void testLockWhileWriting() throws Exception {
    NioWorker worker = createWorker();/*  w w  w  .  ja  v  a 2  s  . c o  m*/
    File f = File.createTempFile(this.getClass().getSimpleName(), "");
    f.delete();
    try {
        RandomAccessFile raf = new RandomAccessFile(f, "rwd");
        FileLock lock = raf.getChannel().lock();
        try {
            // Use the write method, because this "bypasses" the file.exists() check
            worker.write(BYTES, f);
            fail();
        } catch (FsException expected) {
            assertEquals(OverlappingFileLockException.class, expected.getCause().getClass());
        }
        lock.release();
        raf.close();
        f.delete();
        worker.put(BYTES, f);
    } finally {
        FileUtils.deleteQuietly(f);
    }
}

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From source file:com.adaptris.fs.NioWorkerTest.java

@Test
public void testLockWhileReading() throws Exception {
    FsWorker worker = createWorker();//from   w  w  w  . ja va2  s.  co m
    File f = File.createTempFile(this.getClass().getSimpleName(), "");
    f.delete();
    try {
        worker.put(BYTES, f);

        RandomAccessFile raf = new RandomAccessFile(f, "rwd");
        FileLock lock = raf.getChannel().lock();
        try {
            worker.get(f);
            fail();
        } catch (FsException expected) {
            assertEquals(OverlappingFileLockException.class, expected.getCause().getClass());
        }
        lock.release();
        raf.close();
        worker.get(f);
    } finally {
        FileUtils.deleteQuietly(f);
    }
}

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From source file:com.thoughtworks.go.config.GoConfigFileWriter.java

public synchronized void writeToConfigXmlFile(String content) {
    FileChannel channel = null;/*from w  w  w . j a  v a 2 s .c o m*/
    FileOutputStream outputStream = null;
    FileLock lock = null;

    try {
        RandomAccessFile randomAccessFile = new RandomAccessFile(fileLocation(), "rw");
        channel = randomAccessFile.getChannel();
        lock = channel.lock();
        randomAccessFile.seek(0);
        randomAccessFile.setLength(0);
        outputStream = new FileOutputStream(randomAccessFile.getFD());

        IOUtils.write(content, outputStream, UTF_8);
    } catch (Exception e) {
        throw new RuntimeException(e);
    } finally {
        if (channel != null && lock != null) {
            try {
                lock.release();
                channel.close();
                IOUtils.closeQuietly(outputStream);
            } catch (IOException e) {
                LOGGER.error("Error occured when releasing file lock and closing file.", e);
            }
        }
    }
}

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

public PDFPane(String pdfFileLoc) {
    super();//from   w w w . ja 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());
    }
}

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From source file:com.asakusafw.runtime.util.lock.LocalFileLockProvider.java

private FileLock getLock(T target, File lockFile, RandomAccessFile fd) throws IOException {
    try {//from  w w w . j  ava  2  s  .  c  o m
        FileLock result = fd.getChannel().tryLock();
        if (result == null) {
            if (LOG.isDebugEnabled()) {
                LOG.debug(MessageFormat.format("Failed to acquire lock for \"{0}\" ({1})", //$NON-NLS-1$
                        target, lockFile));
            }
        }
        return result;
    } catch (OverlappingFileLockException e) {
        if (LOG.isDebugEnabled()) {
            LOG.debug(MessageFormat.format("Failed to acquire lock for \"{0}\" ({1})", //$NON-NLS-1$
                    target, lockFile)/*, e*/);
        }
        return null;
    }
}

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From source file:org.apache.hama.bsp.message.io.SyncReadByteBufferInputStream.java

public SyncReadByteBufferInputStream(boolean isSpilled, String fileName) {
    spilled = isSpilled;//from w w w . j a  va  2s.c  o m
    if (isSpilled) {
        RandomAccessFile f;
        try {
            f = new RandomAccessFile(fileName, "r");
            fileChannel = f.getChannel();
            fileBytesToRead = fileChannel.size();
        } catch (FileNotFoundException e) {
            LOG.error("File not found initializing Synchronous Input Byte Stream", e);
            throw new RuntimeException(e);
        } catch (IOException e) {
            LOG.error("Error initializing Synchronous Input Byte Stream", e);
            throw new RuntimeException(e);
        }

    }
}

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From source file:com.owncloud.android.oc_framework.network.webdav.FileRequestEntity.java

@Override
public void writeRequest(final OutputStream out) throws IOException {
    //byte[] tmp = new byte[4096];
    ByteBuffer tmp = ByteBuffer.allocate(4096);
    int readResult = 0;

    // TODO(bprzybylski): each mem allocation can throw OutOfMemoryError we need to handle it
    //                    globally in some fashionable manner
    RandomAccessFile raf = new RandomAccessFile(mFile, "r");
    FileChannel channel = raf.getChannel();
    Iterator<OnDatatransferProgressListener> it = null;
    long transferred = 0;
    long size = mFile.length();
    if (size == 0)
        size = -1;//from w w  w  .ja  va 2 s  .co m
    try {
        while ((readResult = channel.read(tmp)) >= 0) {
            out.write(tmp.array(), 0, readResult);
            tmp.clear();
            transferred += readResult;
            synchronized (mDataTransferListeners) {
                it = mDataTransferListeners.iterator();
                while (it.hasNext()) {
                    it.next().onTransferProgress(readResult, transferred, size, mFile.getName());
                }
            }
        }

    } catch (IOException io) {
        Log.e("FileRequestException", io.getMessage());
        throw new RuntimeException(
                "Ugly solution to workaround the default policy of retries when the server falls while uploading ; temporal fix; really",
                io);

    } finally {
        channel.close();
        raf.close();
    }
}

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From source file:net.yacy.document.importer.MediawikiImporter.java

public static byte[] read(final File f, final long start, final int len) {
    final byte[] b = new byte[len];
    RandomAccessFile raf = null;
    try {//ww w.ja  v  a 2  s .  c om
        raf = new RandomAccessFile(f, "r");
        raf.seek(start);
        raf.read(b);
    } catch (final IOException e) {
        ConcurrentLog.logException(e);
        return null;
    } finally {
        if (raf != null)
            try {
                raf.close();
                try {
                    raf.getChannel().close();
                } catch (final IOException e) {
                }
            } catch (final IOException e) {
            }
    }
    return b;
}

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From source file:eu.alefzero.webdav.FileRequestEntity.java

@Override
public void writeRequest(final OutputStream out) throws IOException {
    //byte[] tmp = new byte[4096];
    ByteBuffer tmp = ByteBuffer.allocate(4096);
    int readResult = 0;

    // TODO(bprzybylski): each mem allocation can throw OutOfMemoryError we need to handle it
    //                    globally in some fashionable manner
    RandomAccessFile raf = new RandomAccessFile(mFile, "r");
    FileChannel channel = raf.getChannel();
    Iterator<OnDatatransferProgressListener> it = null;
    long transferred = 0;
    long size = mFile.length();
    if (size == 0)
        size = -1;//from   w ww  . j av a2  s .  c  om
    try {
        while ((readResult = channel.read(tmp)) >= 0) {
            out.write(tmp.array(), 0, readResult);
            tmp.clear();
            transferred += readResult;
            synchronized (mDataTransferListeners) {
                it = mDataTransferListeners.iterator();
                while (it.hasNext()) {
                    it.next().onTransferProgress(readResult, transferred, size, mFile.getName());
                }
            }
        }

    } catch (IOException io) {
        Log_OC.e("FileRequestException", io.getMessage());
        throw new RuntimeException(
                "Ugly solution to workaround the default policy of retries when the server falls while uploading ; temporal fix; really",
                io);

    } finally {
        channel.close();
        raf.close();
    }
}

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