Examples of java.nio.channels.FileChannel.map()

java.nio.channels.FileChannel.map()
Maps the file into memory.There can be three modes:Read-only,Read/write and Private. After mapping, the memory and the file channel do not affect each other. Note : mapping a file into memory is usually expensive. @param mode one of three modes to map @param position the starting position of the file @param size the size to map @return the mapped byte buffer @throws NonReadableChannelException If the file is not opened for reading but the given mode is "READ_ONLY" @throws NonWritableChannelException If the file is not opened for writing but the mode is not "READ_ONLY" @throws IllegalArgumentException If the given parameters of position and size are not correct @throws IOException If any I/O error occurs

        boolean capped = false;
        int lineCount = 0;
        try {
            RandomAccessFile raf = new RandomAccessFile(file, "r");
            FileChannel fc = raf.getChannel();
            MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
            CharBuffer cb = Charset.forName("US-ASCII").decode(bb); //todo: does Jetty use a different charset on a foreign PC?
            Matcher lines = FULL_LINE_PATTERN.matcher(cb);
            Matcher target = ACCESS_LOG_PATTERN.matcher("");
            long start = startDate == null ? 0 : startDate.getTime();
            long end = endDate == null ? 0 : endDate.getTime();

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        boolean capped = false;
        int lineCount = 0;
        try {
            RandomAccessFile raf = new RandomAccessFile(file, "r");
            FileChannel fc = raf.getChannel();
            MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
            CharBuffer cb = Charset.forName("US-ASCII").decode(bb); //todo: does Log4J use a different charset on a foreign PC?
            Matcher target = null;
            Matcher any = null;
            Matcher lines = FULL_LINE_PATTERN.matcher(cb);
            Matcher text = textSearch == null ? null : textSearch.matcher("");

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        boolean capped = false;
        int lineCount = 0;
        try {
            RandomAccessFile raf = new RandomAccessFile(file, "r");
            FileChannel fc = raf.getChannel();
            MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
            CharBuffer cb = Charset.forName("US-ASCII").decode(bb); //todo: does Log4J use a different charset on a foreign PC?
            Matcher target = null;
            Matcher any = null;
            Matcher lines = FULL_LINE_PATTERN.matcher(cb);
            Matcher text = textSearch == null ? null : textSearch.matcher("");

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  private static MappedByteBuffer map(RandomAccessFile raf, MapMode mode,
      long size) throws IOException {
    Closer closer = Closer.create();
    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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               {
                  chf = File.createTempFile("jcrvdedit", null, tempDirectory);
                  chch = new RandomAccessFile(chf, "rw").getChannel();


                  // allocate the space for whole file
                  MappedByteBuffer bb = chch.map(FileChannel.MapMode.READ_WRITE, position + length, 0);
                  bb.force();
                  bb = null;


                  ReadableByteChannel bch = Channels.newChannel(new ByteArrayInputStream(this.data));

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                  bch.close();


                  if (chch.size() < size)
                  {
                     // extend length
                     MappedByteBuffer bb = chch.map(FileChannel.MapMode.READ_WRITE, size, 0);
                     bb.force();
                  }
               }
               catch (final IOException e)
               {

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               {
                  chf = SpoolFile.createTempFile("jcrvdedit", null, tempDirectory);
                  chch = new RandomAccessFile(chf, "rw").getChannel();


                  // allocate the space for whole file
                  MappedByteBuffer bb = chch.map(FileChannel.MapMode.READ_WRITE, position + length, 0);
                  bb.force();
                  bb = null;


                  ReadableByteChannel bch = Channels.newChannel(new ByteArrayInputStream(this.data));

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                  bch.close();


                  if (chch.size() < size)
                  {
                     // extend length
                     MappedByteBuffer bb = chch.map(FileChannel.MapMode.READ_WRITE, size, 0);
                     bb.force();
                  }
               }
               catch (final IOException e)
               {

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    try{
      FileChannel channel = fis.getChannel();
      try{
        long contentLength = content.length();
        //set the content to be a file channel.
        ByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, contentLength);
        x.content = buffer;
        writer.append(x);
      }finally{
        channel.close();
      }

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    FileInputStream fis = new FileInputStream(content);
    try{
      FileChannel channel = fis.getChannel();
      try{
        long contentLength = content.length();
        ByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, contentLength);
        return getmd5(buffer);
      }finally{
        channel.close();
      }
    }finally{

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