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

    try {
      blockChannel = blockIn.getChannel();
      if (blockChannel == null) {
        throw new IOException("Block InputStream has no FileChannel.");
      }
      mmap = blockChannel.map(MapMode.READ_ONLY, 0, length);
      NativeIO.POSIX.getCacheManipulator().mlock(blockFileName, mmap, length);
      verifyChecksum(length, metaIn, blockChannel, blockFileName);
      mappableBlock = new MappableBlock(mmap, length);
    } finally {
      IOUtils.closeQuietly(blockChannel);

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  private String getFileFromClasspathAsString(String classPathFilePath, String encoding) throws IOException, URISyntaxException {
    String output = "";
    FileInputStream stream = new FileInputStream(new File(getClass().getResource(classPathFilePath).toURI()));
    try {
      FileChannel fc = stream.getChannel();
      MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0,fc.size());
      output = Charset.forName(encoding).decode(bb).toString();
    } finally {
      stream.close();
    }
    return output;

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  private static String readFile(File file) throws IOException {
    FileInputStream stream = new FileInputStream(file);
    try {
      FileChannel fc = stream.getChannel();
      MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
      return Charset.defaultCharset().decode(bb).toString();
    }
    finally {
      stream.close();
    }

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                       || (start>0 && start<=logFileTime && end>0 && end>=logFileTime)) {


                        // It's in the range, so process the file
                        RandomAccessFile raf = new RandomAccessFile(logFiles[i], "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 Tomcat use a different charset on a foreign PC?
                        Matcher lines = FULL_LINE_PATTERN.matcher(cb);
                        Matcher target = ACCESS_LOG_PATTERN.matcher("");
                        SimpleDateFormat format = (start == 0 && end == 0) ? null : new SimpleDateFormat(ACCESS_LOG_DATE_FORMAT);
                        int max = maxResults == null ? MAX_SEARCH_RESULTS : Math.min(maxResults.intValue(), MAX_SEARCH_RESULTS);

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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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                       || (start>0 && start<=logFileTime && end>0 && end>=logFileTime)) {


                        // It's in the range, so process the file
                        RandomAccessFile raf = new RandomAccessFile(logFiles[i], "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("");
                        SimpleDateFormat format = (start == 0 && end == 0) ? null : new SimpleDateFormat(ACCESS_LOG_DATE_FORMAT);
                        int max = maxResults == null ? MAX_SEARCH_RESULTS : Math.min(maxResults.intValue(), MAX_SEARCH_RESULTS);

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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 Derby use a different charset on a foreign PC?
            Matcher lines = FULL_LINE_PATTERN.matcher(cb);
            Matcher text = textSearch == null ? null : textSearch.matcher("");
            max = Math.min(max, MAX_SEARCH_RESULTS);
            while(lines.find()) {

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        FileInputStream fis = new FileInputStream(file);
        FileChannel fc = fis.getChannel();


        // Get the file's size and then map it into memory
        int sz = (int)fc.size();
        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, sz);


        // Decode the file into a char buffer
        CharBuffer cb = decoder.decode(bb);


        // Perform the search

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        FileInputStream fis = new FileInputStream(file);
        FileChannel fc = fis.getChannel();


        // Get the file's size and then map it into memory
        int sz = (int)fc.size();
        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, sz);


        // Decode the file into a char buffer
        CharBuffer cb = decoder.decode(bb);


        // Perform the search

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        FileInputStream fis = new FileInputStream(file);
        FileChannel fc = fis.getChannel();


        // Get the file's size and then map it into memory
        int sz = (int)fc.size();
        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, sz);


  // Decode the file into a char buffer
        // Charset and decoder for ISO-8859-15
        Charset charset = Charset.forName("ISO-8859-15");
        CharsetDecoder decoder = charset.newDecoder();

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