Examples with RandomAccessFile java.io.RandomAccessFile used on opensource projects

Example 51 with RandomAccessFile

use of java.io.RandomAccessFile in project android_frameworks_base by ParanoidAndroid.

the class MiniThumbFile method saveMiniThumbToFile.

public synchronized void saveMiniThumbToFile(byte[] data, long id, long magic) throws IOException {
    RandomAccessFile r = miniThumbDataFile();
    if (r == null)
        return;
    long pos = id * BYTES_PER_MINTHUMB;
    FileLock lock = null;
    try {
        if (data != null) {
            if (data.length > BYTES_PER_MINTHUMB - HEADER_SIZE) {
                // not enough space to store it.
                return;
            }
            mBuffer.clear();
            mBuffer.put((byte) 1);
            mBuffer.putLong(magic);
            mBuffer.putInt(data.length);
            mBuffer.put(data);
            mBuffer.flip();
            lock = mChannel.lock(pos, BYTES_PER_MINTHUMB, false);
            mChannel.write(mBuffer, pos);
        }
    } catch (IOException ex) {
        Log.e(TAG, "couldn't save mini thumbnail data for " + id + "; ", ex);
        throw ex;
    } catch (RuntimeException ex) {
        // Other NIO related exception like disk full, read only channel..etc
        Log.e(TAG, "couldn't save mini thumbnail data for " + id + "; disk full or mount read-only? " + ex.getClass());
    } finally {
        try {
            if (lock != null)
                lock.release();
        } catch (IOException ex) {
        // ignore it.
        }
    }
}

Example 52 with RandomAccessFile

use of java.io.RandomAccessFile in project neo4j by neo4j.

the class TestBrokenStoreRecovery method trimFileToSize.

private void trimFileToSize(File theFile, int toSize) throws IOException {
    try (FileChannel theChannel = new RandomAccessFile(theFile, "rw").getChannel()) {
        theChannel.truncate(toSize);
        theChannel.force(false);
    }
}

Example 53 with RandomAccessFile

use of java.io.RandomAccessFile in project neo4j by neo4j.

the class LabelScanStoreTest method scrambleFile.

public static void scrambleFile(Random random, File file) throws IOException {
    try (RandomAccessFile fileAccess = new RandomAccessFile(file, "rw");
        FileChannel channel = fileAccess.getChannel()) {
        // The files will be small, so OK to allocate a buffer for the full size
        byte[] bytes = new byte[(int) channel.size()];
        putRandomBytes(random, bytes);
        ByteBuffer buffer = ByteBuffer.wrap(bytes);
        channel.position(0);
        channel.write(buffer);
    }
}

Example 54 with RandomAccessFile

use of java.io.RandomAccessFile in project cogtool by cogtool.

the class ObjectPersister method diskSize.

/**
     * Recursively computes the size on disk of a file or directory.
     *
     * @param file the file or directory to check
     * @return sum of RandomAccessFile.length() for all files at this location
     * @throws IOException if any error occurs while reading file sizes
     */
private static long diskSize(File file) throws IOException {
    if (file.isFile()) {
        // Base case
        long size;
        RandomAccessFile f = null;
        try {
            f = new RandomAccessFile(file, "r");
            size = f.length();
        } finally {
            if (f != null) {
                f.close();
            }
        }
        return size;
    }
    // Recursive case
    File[] files = file.listFiles();
    long sum = 0;
    for (File file2 : files) {
        sum += diskSize(file2);
    }
    return sum;
}

Example 55 with RandomAccessFile

use of java.io.RandomAccessFile in project druid by druid-io.

the class LogUtils method streamFile.

/**
   * Open a stream to a file.
   *
   * @param offset If zero, stream the entire log. If positive, read from this byte position onwards. If negative,
   *               read this many bytes from the end of the file.
   *
   * @return input supplier for this log, if available from this provider
   */
public static InputStream streamFile(final File file, final long offset) throws IOException {
    final RandomAccessFile raf = new RandomAccessFile(file, "r");
    final long rafLength = raf.length();
    if (offset > 0) {
        raf.seek(offset);
    } else if (offset < 0 && offset < rafLength) {
        raf.seek(Math.max(0, rafLength + offset));
    }
    return Channels.newInputStream(raf.getChannel());
}