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:ValidateLicenseHeaders.java

/**
 * Replace a legacy jboss header with the current default header
 * /*from  w  ww  .j a v  a 2  s  . c  om*/
 * @param javaFile -
 *          the java source file
 * @param endOfHeader -
 *          the offset to the end of the legacy header
 * @throws IOException -
 *           thrown on failure to replace the header
 */
static void replaceHeader(File javaFile, long endOfHeader) throws IOException {
    if (log.isLoggable(Level.FINE))
        log.fine("Replacing legacy jboss header in: " + javaFile);
    RandomAccessFile raf = new RandomAccessFile(javaFile, "rw");
    File bakFile = new File(javaFile.getAbsolutePath() + ".bak");
    FileOutputStream fos = new FileOutputStream(bakFile);
    fos.write(DEFAULT_HEADER.getBytes());
    FileChannel fc = raf.getChannel();
    long count = raf.length() - endOfHeader;
    fc.transferTo(endOfHeader, count, fos.getChannel());
    fc.close();
    fos.close();
    raf.close();
    if (javaFile.delete() == false)
        log.severe("Failed to delete java file: " + javaFile);
    if (bakFile.renameTo(javaFile) == false)
        throw new SyncFailedException("Failed to replace: " + javaFile);
}

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From source file:storybook.SbApp.java

private static boolean lockInstance(final String lockFile) {
    try {// w  ww  . j ava  2s  .  co m
        final File file = new File(lockFile);
        final RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw");
        final FileLock fileLock = randomAccessFile.getChannel().tryLock();
        if (fileLock != null) {
            Runtime.getRuntime().addShutdownHook(new Thread() {
                @Override
                public void run() {
                    try {
                        fileLock.release();
                        randomAccessFile.close();
                        file.delete();
                    } catch (IOException e) {
                        System.err.println("Unable to remove lock file: " + lockFile + "->" + e.getMessage());
                    }
                }
            });
            return true;
        }
    } catch (IOException e) {
        System.err.println("Unable to create and/or lock file: " + lockFile + "->" + e.getMessage());
    }
    return false;
}

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From source file:it.geosolutions.tools.io.file.Copy.java

/**
 * Copy the input file onto the output file using the specified buffer size.
 * /*  www  .  j  a va2  s  .  c  o m*/
 * @param sourceFile
 *            the {@link File} to copy from.
 * @param destinationFile
 *            the {@link File} to copy to.
 * @param size
 *            buffer size.
 * @throws IOException
 *             in case something bad happens.
 */
public static void copyFile(File sourceFile, File destinationFile, int size) throws IOException {
    Objects.notNull(sourceFile, destinationFile);
    if (!sourceFile.exists() || !sourceFile.canRead() || !sourceFile.isFile())
        throw new IllegalStateException("Source is not in a legal state.");
    if (!destinationFile.exists()) {
        destinationFile.createNewFile();
    }
    if (destinationFile.getAbsolutePath().equalsIgnoreCase(sourceFile.getAbsolutePath()))
        throw new IllegalArgumentException("Cannot copy a file on itself");

    RandomAccessFile s = null, d = null;
    FileChannel source = null;
    FileChannel destination = null;
    try {
        s = new RandomAccessFile(sourceFile, "r");
        source = s.getChannel();
        d = new RandomAccessFile(destinationFile, "rw");
        destination = d.getChannel();
        IOUtils.copyFileChannel(size, source, destination);
    } finally {
        if (source != null) {
            try {
                source.close();
            } catch (Throwable t) {
                if (LOGGER.isInfoEnabled())
                    LOGGER.info(t.getLocalizedMessage(), t);
            }
        }
        if (s != null) {
            try {
                s.close();
            } catch (Throwable t) {
                if (LOGGER.isInfoEnabled())
                    LOGGER.info(t.getLocalizedMessage(), t);
            }
        }

        if (destination != null) {
            try {
                destination.close();
            } catch (Throwable t) {
                if (LOGGER.isInfoEnabled())
                    LOGGER.info(t.getLocalizedMessage(), t);
            }
        }

        if (d != null) {
            try {
                d.close();
            } catch (Throwable t) {
                if (LOGGER.isInfoEnabled())
                    LOGGER.info(t.getLocalizedMessage(), t);
            }
        }
    }
}

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From source file:com.bigdata.dastor.io.SSTableReader.java

private static MappedByteBuffer mmap(String filename, long start, int size) throws IOException {
    RandomAccessFile raf;
    try {/*from  w w  w . j ava2  s  . c  om*/
        raf = new RandomAccessFile(filename, "r");
    } catch (FileNotFoundException e) {
        throw new IOError(e);
    }

    try {
        return raf.getChannel().map(FileChannel.MapMode.READ_ONLY, start, size);
    } finally {
        raf.close();
    }
}

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From source file:com.polyvi.xface.util.XFileUtils.java

/**
 * ?/*from   ww w. java 2 s.c  o m*/
 *
 * @param filePath
 *            ?
 * @param size
 *            size?
 * @return 
 */
public static long truncateFile(String fileName, long size) throws FileNotFoundException, IOException {
    RandomAccessFile raf = new RandomAccessFile(fileName, "rw");

    if (raf.length() >= size) {
        FileChannel channel = raf.getChannel();
        channel.truncate(size);
        return size;
    }

    return raf.length();
}

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From source file:edu.mbl.jif.imaging.mmtiff.MultipageTiffReader.java

public static boolean isMMMultipageTiff(String directory) throws IOException {
    File dir = new File(directory);
    File[] children = dir.listFiles();
    File testFile = null;/*from w w  w .j  ava 2  s.  co m*/
    for (File child : children) {
        if (child.isDirectory()) {
            File[] grandchildren = child.listFiles();
            for (File grandchild : grandchildren) {
                if (grandchild.getName().endsWith(".tif")) {
                    testFile = grandchild;
                    break;
                }
            }
        } else if (child.getName().endsWith(".tif") || child.getName().endsWith(".TIF")) {
            testFile = child;
            break;
        }
    }
    if (testFile == null) {
        throw new IOException("Unexpected file structure: is this an MM dataset?");
    }
    RandomAccessFile ra;
    try {
        ra = new RandomAccessFile(testFile, "r");
    } catch (FileNotFoundException ex) {
        ReportingUtils.logError(ex);
        return false;
    }
    FileChannel channel = ra.getChannel();
    ByteBuffer tiffHeader = ByteBuffer.allocate(36);
    ByteOrder bo;
    channel.read(tiffHeader, 0);
    char zeroOne = tiffHeader.getChar(0);
    if (zeroOne == 0x4949) {
        bo = ByteOrder.LITTLE_ENDIAN;
    } else if (zeroOne == 0x4d4d) {
        bo = ByteOrder.BIG_ENDIAN;
    } else {
        throw new IOException("Error reading Tiff header");
    }
    tiffHeader.order(bo);
    int summaryMDHeader = tiffHeader.getInt(32);
    channel.close();
    ra.close();
    if (summaryMDHeader == MultipageTiffWriter.SUMMARY_MD_HEADER) {
        return true;
    }
    return false;
}

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From source file:org.uva.itast.blended.omr.OMRUtils.java

/**
 * Mtodo que a partir de un fichero pdf de entrada devuelve el
 * nmero su pginas//www. j a va2s  . c  om
 * 
 * @param inputdir
 * @return pdffile.getNumpages();
 * @throws IOException
 */
public static int getNumpagesPDF(String inputdir) throws IOException {
    RandomAccessFile raf = new RandomAccessFile(inputdir, "r"); // se carga
    // la imagen
    // pdf para
    // leerla
    FileChannel channel = raf.getChannel();
    ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
    PDFFile pdffile = new PDFFile(buf); // se crea un objeto de tipo PDFFile
    // para almacenar las pginas
    return pdffile.getNumPages(); // se obtiene el nmero de paginas
}

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From source file:org.apache.jackrabbit.oak.run.SegmentUtils.java

static void compact(File directory, boolean force) throws IOException {
    FileStore store = openFileStore(directory.getAbsolutePath(), force);
    try {//from  www.ja  v  a2  s . co  m
        boolean persistCM = Boolean.getBoolean("tar.PersistCompactionMap");
        CompactionStrategy compactionStrategy = new CompactionStrategy(false,
                CompactionStrategy.CLONE_BINARIES_DEFAULT, CompactionStrategy.CleanupType.CLEAN_ALL, 0,
                CompactionStrategy.MEMORY_THRESHOLD_DEFAULT) {

            @Override
            public boolean compacted(Callable<Boolean> setHead) throws Exception {
                // oak-run is doing compaction single-threaded
                // hence no guarding needed - go straight ahead
                // and call setHead
                return setHead.call();
            }
        };
        compactionStrategy.setOfflineCompaction(true);
        compactionStrategy.setPersistCompactionMap(persistCM);
        store.setCompactionStrategy(compactionStrategy);
        store.compact();
    } finally {
        store.close();
    }

    System.out.println("    -> cleaning up");
    store = openFileStore(directory.getAbsolutePath(), false);
    try {
        for (File file : store.cleanup()) {
            if (!file.exists() || file.delete()) {
                System.out.println("    -> removed old file " + file.getName());
            } else {
                System.out.println("    -> failed to remove old file " + file.getName());
            }
        }

        String head;
        File journal = new File(directory, "journal.log");
        JournalReader journalReader = new JournalReader(journal);
        try {
            head = journalReader.iterator().next() + " root " + System.currentTimeMillis() + "\n";
        } finally {
            journalReader.close();
        }

        RandomAccessFile journalFile = new RandomAccessFile(journal, "rw");
        try {
            System.out.println("    -> writing new " + journal.getName() + ": " + head);
            journalFile.setLength(0);
            journalFile.writeBytes(head);
            journalFile.getChannel().force(false);
        } finally {
            journalFile.close();
        }
    } finally {
        store.close();
    }
}

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From source file:net.simon04.guavavfs.VirtualFiles.java

private static MappedByteBuffer map(RandomAccessFile raf, MapMode mode, long size) throws IOException {
    Closer closer = Closer.create();/*from  w w  w.  ja  v  a2  s.c om*/
    try {
        FileChannel channel = closer.register(raf.getChannel());
        return channel.map(mode, 0, size);
    } catch (Throwable e) {
        throw closer.rethrow(e);
    } finally {
        closer.close();
    }
}

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From source file:org.apache.jackrabbit.oak.run.SegmentTarUtils.java

static void compact(File directory, boolean force) throws IOException {
    FileStore store = newFileStoreBuilder(directory.getAbsolutePath(), force)
            .withGCOptions(defaultGCOptions().setOffline()).build();
    try {/*  w w  w. j a v a  2  s. com*/
        store.compact();
    } finally {
        store.close();
    }

    System.out.println("    -> cleaning up");
    store = newFileStoreBuilder(directory.getAbsolutePath(), force)
            .withGCOptions(defaultGCOptions().setOffline()).build();
    try {
        for (File file : store.cleanup()) {
            if (!file.exists() || file.delete()) {
                System.out.println("    -> removed old file " + file.getName());
            } else {
                System.out.println("    -> failed to remove old file " + file.getName());
            }
        }

        String head;
        File journal = new File(directory, "journal.log");
        JournalReader journalReader = new JournalReader(journal);
        try {
            head = journalReader.next() + " root " + System.currentTimeMillis() + "\n";
        } finally {
            journalReader.close();
        }

        RandomAccessFile journalFile = new RandomAccessFile(journal, "rw");
        try {
            System.out.println("    -> writing new " + journal.getName() + ": " + head);
            journalFile.setLength(0);
            journalFile.writeBytes(head);
            journalFile.getChannel().force(false);
        } finally {
            journalFile.close();
        }
    } finally {
        store.close();
    }
}

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