Example usage for java.io FileInputStream getChannel

Introduction

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

Prototype

public FileChannel getChannel() 

Source Link

Document

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

Usage

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

/**
 * Copy the given source file to the given destination
 *
 * @param sourceFile//  w  w w . ja  va 2 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);
    }
}

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From source file:com.alibaba.otter.shared.common.utils.NioUtilsPerformance.java

public static void mappedTest(File source, File target) throws Exception {
    FileInputStream fis = null;
    FileOutputStream fos = null;/*from   ww w  .  ja  va 2 s  . c om*/
    MappedByteBuffer mapbuffer = null;

    try {
        long fileSize = source.length();
        final byte[] outputData = new byte[(int) fileSize];
        fis = new FileInputStream(source);
        fos = new FileOutputStream(target);
        FileChannel sChannel = fis.getChannel();

        target.createNewFile();

        mapbuffer = sChannel.map(FileChannel.MapMode.READ_ONLY, 0, fileSize);
        for (int i = 0; i < fileSize; i++) {
            outputData[i] = mapbuffer.get();
        }

        mapbuffer.clear();
        fos.write(outputData);
        fos.flush();
    } finally {
        IOUtils.closeQuietly(fis);
        IOUtils.closeQuietly(fos);

        if (mapbuffer == null) {
            return;
        }

        final Object buffer = mapbuffer;

        AccessController.doPrivileged(new PrivilegedAction() {

            public Object run() {
                try {
                    Method clean = buffer.getClass().getMethod("cleaner", new Class[0]);

                    if (clean == null) {
                        return null;
                    }
                    clean.setAccessible(true);
                    sun.misc.Cleaner cleaner = (sun.misc.Cleaner) clean.invoke(buffer, new Object[0]);
                    cleaner.clean();
                } catch (Throwable ex) {
                }

                return null;
            }
        });
    }
}

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From source file:gov.nih.nci.ncicb.tcga.dcc.qclive.common.util.FileCopier.java

/**
 * Copies the contents of a file into a new file in the given directory.  The new file will have the same name as
 * the original file.//from w w  w .j a  v a 2 s  .com
 *
 * @param fromFile the file to copy
 * @param deployDirectory the directory in which to copy the file -- if this is not a directory, the new file will
 * be created with this name
 *
 * @return the File that was created
 *
 * @throws IOException if there are I/O errors during reading or writing
 */
public static File copy(final File fromFile, final File deployDirectory) throws IOException {
    // if not a directory, then just use deployDirectory as the filename for the copy
    File destination = deployDirectory;
    if (deployDirectory.isDirectory()) {
        // otherwise use original file's name
        destination = new File(deployDirectory, fromFile.getName());
    }

    FileInputStream fileInputStream = null;
    FileChannel sourceChannel = null;
    FileOutputStream fileOutputStream = null;
    FileChannel destinationChannel = null;

    try {
        //noinspection IOResourceOpenedButNotSafelyClosed
        fileInputStream = new FileInputStream(fromFile);
        //noinspection ChannelOpenedButNotSafelyClosed
        sourceChannel = fileInputStream.getChannel();

        //noinspection IOResourceOpenedButNotSafelyClosed
        fileOutputStream = new FileOutputStream(destination);
        //noinspection ChannelOpenedButNotSafelyClosed
        destinationChannel = fileOutputStream.getChannel();
        final int maxCount = (64 * 1024 * 1024) - (32 * 1024);
        final long size = sourceChannel.size();
        long position = 0;
        while (position < size) {
            position += sourceChannel.transferTo(position, maxCount, destinationChannel);
        }
    } catch (IOException ie) {
        throw new IOException("Failed to copy " + fromFile + " to " + deployDirectory + ".\n Error Details: "
                + ie.toString());
    } finally {
        IOUtils.closeQuietly(fileInputStream);
        IOUtils.closeQuietly(sourceChannel);
        IOUtils.closeQuietly(fileOutputStream);
        IOUtils.closeQuietly(destinationChannel);
    }

    return destination;
}

---

From source file:org.apache.pig.pigunit.PigTest.java

private static String readFile(File file) throws IOException {
    FileInputStream stream = new FileInputStream(file);
    try {//from   www  . j  a va 2s . co  m
        FileChannel fc = stream.getChannel();
        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
        return Charset.defaultCharset().decode(bb).toString();
    } finally {
        stream.close();
    }
}

---

From source file:com.log4ic.compressor.utils.FileUtils.java

/**
 * ?/*  ww w. ja v  a 2  s .co  m*/
 *
 * @param fileInputStream
 * @return
 */
public static String readFile(FileInputStream fileInputStream) throws IOException {
    ByteBuffer buffer = ByteBuffer.allocate(1024);
    StringBuffer contentBuffer = new StringBuffer();
    Charset charset = null;
    CharsetDecoder decoder = null;
    CharBuffer charBuffer = null;
    try {
        FileChannel channel = fileInputStream.getChannel();
        while (true) {
            buffer.clear();
            int pos = channel.read(buffer);
            if (pos == -1) {
                break;
            }
            buffer.flip();
            charset = Charset.forName("UTF-8");
            decoder = charset.newDecoder();
            charBuffer = decoder.decode(buffer);
            contentBuffer.append(charBuffer.toString());
        }
    } finally {
        if (fileInputStream != null) {
            try {
                fileInputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return contentBuffer.toString();
}

---

From source file:de.wikilab.android.friendica01.Max.java

public static String readFile(String path) throws IOException {
    FileInputStream stream = new FileInputStream(new File(path));
    try {//w  ww  .  j a  v a 2  s . c om
        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.defaultCharset().decode(bb).toString();
    } finally {
        stream.close();
    }
}

---

From source file:tudarmstadt.lt.ABSentiment.featureExtractor.util.GloVeSpace.java

/**
 * Reads a binary model//w  w  w  .java 2  s . com
 * @param vocabFile vocabulary file, containing all the words in the binary file
 * @param gloVeModel path containing the binary model
 * @param norm specifies if the word representation is to be normalised
 * @return a model containing the word representation of all the words in the vocabulary
 */
public static GloVeSpace load(String vocabFile, String gloVeModel, boolean norm) {
    GloVeSpace model = new GloVeSpace();
    try {
        FileInputStream in = new FileInputStream(gloVeModel);
        DataInputStream ds = new DataInputStream(new BufferedInputStream(in, 131072));
        List<String> vocab = FileUtils.readLines(new File(vocabFile));
        long numWords = vocab.size();
        // Vector Size = num of bytes in total / 16 / vocab
        int vecSize = (int) (in.getChannel().size() / 16 / numWords) - 1;
        // Word Vectors:
        for (String aVocab : vocab) {
            String word = StringUtils.split(aVocab, ' ')[0];
            float[] vector = readFloatVector(ds, vecSize);
            model.store.put(word, new FloatMatrix(vector));
        }
        // Unit Vectors:
        if (norm) {
            for (Entry<String, FloatMatrix> e : model.store.entrySet()) {
                model.store.put(e.getKey(), VectorMath.normalize(e.getValue()));
            }
        }
        vectorLength = vecSize;
        System.out.println(String.format("Loaded %s words, vector size %s", numWords, vecSize));
    } catch (IOException e) {
        System.err.println("ERROR: Failed to load model: " + gloVeModel);
        e.printStackTrace();
    }
    return model;
}

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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.//from ww  w .j  av a  2 s  .c om
 * 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.jboss.as.forge.util.Files.java

/**
 * Copies the source file to the destination file.
 *
 * @param srcFile    the file to copy/*from   w w w  .ja v  a 2s.com*/
 * @param targetFile the target file
 *
 * @return {@code true} if the file was successfully copied, {@code false} if the copy failed or was incomplete
 *
 * @throws IOException if an IO error occurs copying the file
 */
public static boolean copyFile(final File srcFile, final File targetFile) throws IOException {
    FileInputStream in = null;
    FileOutputStream out = null;
    FileChannel inChannel = null;
    FileChannel outChannel = null;
    try {
        in = new FileInputStream(srcFile);
        inChannel = in.getChannel();
        out = new FileOutputStream(targetFile);
        outChannel = out.getChannel();
        long bytesTransferred = 0;
        while (bytesTransferred < inChannel.size()) {
            bytesTransferred += inChannel.transferTo(0, inChannel.size(), outChannel);
        }
    } finally {
        Streams.safeClose(outChannel);
        Streams.safeClose(out);
        Streams.safeClose(inChannel);
        Streams.safeClose(in);
    }
    return srcFile.length() == targetFile.length();
}

---

From source file:org.srlutils.Files.java

/** load an object from file name, the returned size seems to be right, but i don't see it in the java spec */
public static DiskObject load(String name) {
    FileInputStream fin = null;
    ObjectInputStream in = null;// w  ww .ja v a2s . c  o  m
    Object obj = null;
    long size = 0;
    RuntimeException rte = null;
    try {
        fin = new FileInputStream(name);
        in = new ObjectInputStream(fin);
        obj = in.readObject();
        size = fin.getChannel().position(); // hack::undocumented -- is this in the javadocs ?
    } catch (ClassNotFoundException ex) {
        rte = rte(ex, "could not instatiate object from file: %s", name);
    } catch (IOException ex) {
        rte = rte(ex, "could not read object from file: %s", name);
    } finally {
        try {
            in.close();
            fin.close();
        } catch (Exception ex) {
        }
    }
    if (rte != null)
        throw rte;
    return new DiskObject(obj, name, size);
}

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