Example usage for java.nio CharBuffer position

Introduction

In this page you can find the example usage for java.nio CharBuffer position.

Prototype

public final int position() 

Source Link

Document

Returns the position of this buffer.

Usage

From source file:MainClass.java

public static void main(String[] args) {
    String[] phrases = { "A", "B 1", "C 1.3" };
    String dirname = "C:/test";
    String filename = "Phrases.txt";
    File dir = new File(dirname);
    File aFile = new File(dir, filename);
    FileOutputStream outputFile = null;
    try {//from   w ww . ja v  a  2 s  .c om
        outputFile = new FileOutputStream(aFile, true);
    } catch (FileNotFoundException e) {
        e.printStackTrace(System.err);
    }
    FileChannel outChannel = outputFile.getChannel();
    ByteBuffer buf = ByteBuffer.allocate(1024);
    System.out.println(buf.position());
    System.out.println(buf.limit());
    System.out.println(buf.capacity());
    CharBuffer charBuf = buf.asCharBuffer();
    System.out.println(charBuf.position());
    System.out.println(charBuf.limit());
    System.out.println(charBuf.capacity());
    Formatter formatter = new Formatter(charBuf);
    int number = 0;
    for (String phrase : phrases) {
        formatter.format("%n %s", ++number, phrase);
        System.out.println(charBuf.position());
        System.out.println(charBuf.limit());
        System.out.println(charBuf.capacity());
        charBuf.flip();
        System.out.println(charBuf.position());
        System.out.println(charBuf.limit());
        System.out.println(charBuf.length());
        buf.limit(2 * charBuf.length()); // Set byte buffer limit
        System.out.println(buf.position());
        System.out.println(buf.limit());
        System.out.println(buf.remaining());
        try {
            outChannel.write(buf);
            buf.clear();
            charBuf.clear();
        } catch (IOException e) {
            e.printStackTrace(System.err);
        }
    }
    try {
        outputFile.close();
    } catch (IOException e) {
        e.printStackTrace(System.err);
    }
}

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From source file:MainClass.java

public static void main(String[] args) {
    ByteBuffer bb = ByteBuffer.wrap(new byte[] { 0, 0, 0, 0, 0, 0, 0, 'a' });
    bb.rewind();/*  w ww.j av a 2  s .  c  o  m*/
    CharBuffer cb = ((ByteBuffer) bb.rewind()).asCharBuffer();
    System.out.println("Char Buffer");
    while (cb.hasRemaining())
        System.out.println(cb.position() + " -> " + cb.get());
}

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From source file:MainClass.java

public static void main(String[] args) {
    File aFile = new File("afile.txt");
    FileOutputStream outputFile = null;
    try {/*from w  w w. j av a 2s  .  c  o m*/
        outputFile = new FileOutputStream(aFile, true);
        System.out.println("File stream created successfully.");
    } catch (FileNotFoundException e) {
        e.printStackTrace(System.err);
    }
    ByteBuffer buf = ByteBuffer.allocate(1024);
    System.out.println("\nByte buffer:");
    System.out.printf("position = %2d  Limit = %4d  capacity = %4d%n", buf.position(), buf.limit(),
            buf.capacity());

    // Create a view buffer
    CharBuffer charBuf = buf.asCharBuffer();
    System.out.println("Char view buffer:");
    System.out.printf("position = %2d  Limit = %4d  capacity = %4d%n", charBuf.position(), charBuf.limit(),
            charBuf.capacity());
    try {
        outputFile.close(); // Close the O/P stream & the channel
    } catch (IOException e) {
        e.printStackTrace(System.err);
    }
}

---

From source file:Main.java

public static void main(String[] args) {
    ByteBuffer bb = ByteBuffer.wrap(new byte[] { 0, 0, 0, 0, 0, 0, 0, 'a' });
    bb.rewind();/*from  ww  w  .j  a  v  a2 s.c o  m*/
    System.out.println("Byte Buffer");
    while (bb.hasRemaining())
        System.out.println(bb.position() + " -> " + bb.get());
    CharBuffer cb = ((ByteBuffer) bb.rewind()).asCharBuffer();
    System.out.println("Char Buffer");
    while (cb.hasRemaining())
        System.out.println(cb.position() + " -> " + cb.get());
    FloatBuffer fb = ((ByteBuffer) bb.rewind()).asFloatBuffer();
    System.out.println("Float Buffer");
    while (fb.hasRemaining())
        System.out.println(fb.position() + " -> " + fb.get());
    IntBuffer ib = ((ByteBuffer) bb.rewind()).asIntBuffer();
    System.out.println("Int Buffer");
    while (ib.hasRemaining())
        System.out.println(ib.position() + " -> " + ib.get());
    LongBuffer lb = ((ByteBuffer) bb.rewind()).asLongBuffer();
    System.out.println("Long Buffer");
    while (lb.hasRemaining())
        System.out.println(lb.position() + " -> " + lb.get());
    ShortBuffer sb = ((ByteBuffer) bb.rewind()).asShortBuffer();
    System.out.println("Short Buffer");
    while (sb.hasRemaining())
        System.out.println(sb.position() + " -> " + sb.get());
    DoubleBuffer db = ((ByteBuffer) bb.rewind()).asDoubleBuffer();
    System.out.println("Double Buffer");
    while (db.hasRemaining())
        System.out.println(db.position() + " -> " + db.get());
}

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From source file:MainClass.java

public static void main(String[] args) {
    long[] primes = new long[] { 1, 2, 3, 5, 7 };
    File aFile = new File("C:/test/primes.txt");
    FileOutputStream outputFile = null;
    try {/*from w  w  w . ja  va 2 s  .co  m*/
        outputFile = new FileOutputStream(aFile);
    } catch (FileNotFoundException e) {
        e.printStackTrace(System.err);
    }
    FileChannel file = outputFile.getChannel();
    final int BUFFERSIZE = 100;
    ByteBuffer buf = ByteBuffer.allocate(BUFFERSIZE);
    DoubleBuffer doubleBuf = buf.asDoubleBuffer();
    buf.position(8);
    CharBuffer charBuf = buf.asCharBuffer();
    for (long prime : primes) {
        String primeStr = "prime = " + prime;
        doubleBuf.put(0, (double) primeStr.length());
        charBuf.put(primeStr);
        buf.position(2 * charBuf.position() + 8);
        LongBuffer longBuf = buf.asLongBuffer();
        longBuf.put(prime);
        buf.position(buf.position() + 8);
        buf.flip();
        try {
            file.write(buf);
        } catch (IOException e) {
            e.printStackTrace(System.err);
        }
        buf.clear();
        doubleBuf.clear();
        charBuf.clear();
    }
    try {
        System.out.println("File written is " + file.size() + "bytes.");
        outputFile.close();
    } catch (IOException e) {
        e.printStackTrace(System.err);
    }
}

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From source file:MainClass.java

private static void println(CharBuffer cb) {
    System.out.println("pos=" + cb.position() + ", limit=" + cb.limit() + ": '" + cb + "'");
}

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From source file:MainClass.java

private static void println(CharBuffer cb) {
    System.out.println("pos=" + cb.position() + ", limit=" + cb.limit() + ", capacity=" + cb.capacity() + ": '"
            + cb + "'");
}

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From source file:MainClass.java

private static void println(CharBuffer cb) {
    System.out.println("pos=" + cb.position() + ", limit=" + cb.limit() + ", capacity=" + cb.capacity()
            + ", arrayOffset=" + cb.arrayOffset());
}

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From source file:com.odiago.flumebase.io.CharBufferUtils.java

/**
 * Parses a CharSequence into an integer in base 10.
 *///from   w w  w  . j  a  va2s.  c o m
public static int parseInt(CharBuffer chars) throws ColumnParseException {
    int result = 0;

    final int limit = chars.limit();
    final int start = chars.position();
    if (0 == limit - start) {
        // The empty string can not be parsed as an integer.
        throw new ColumnParseException("No value provided");
    }

    boolean isNegative = false;
    for (int pos = start; pos < limit; pos++) {
        char cur = chars.get();
        if (pos == start && cur == '-') {
            isNegative = true;
            if (limit - start == 1) {
                // "-" is not an integer we accept.
                throw new ColumnParseException("No integer part provided");
            }
        } else if (Character.isDigit(cur)) {
            byte digitVal = (byte) (cur - '0');
            result = result * 10 - digitVal;
            // TODO: Detect over/underflow and signal exception?
        } else {
            throw new ColumnParseException("Invalid character in number");
        }
    }

    // We built up the value as a negative, to use the larger "half" of the
    // integer range. If it's not negative, flip it on return.
    return isNegative ? result : -result;
}

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From source file:com.odiago.flumebase.io.CharBufferUtils.java

/**
 * Parses a CharSequence into a long in base 10.
 *///from w ww.j a v  a2  s . c o m
public static long parseLong(CharBuffer chars) throws ColumnParseException {
    long result = 0L;

    final int limit = chars.limit();
    final int start = chars.position();
    if (0 == limit - start) {
        // The empty string can not be parsed as an integer.
        throw new ColumnParseException("No value provided");
    }

    boolean isNegative = false;
    for (int pos = start; pos < limit; pos++) {
        char cur = chars.get();
        if (pos == start && cur == '-') {
            isNegative = true;
            if (limit - start == 1) {
                // "-" is not an integer we accept.
                throw new ColumnParseException("No integer part provided");
            }
        } else if (Character.isDigit(cur)) {
            byte digitVal = (byte) (cur - '0');
            result = result * 10 - digitVal;
            // TODO: Detect over/underflow and signal exception?
        } else {
            throw new ColumnParseException("Invalid character in number");
        }
    }

    // We built up the value as a negative, to use the larger "half" of the
    // integer range. If it's not negative, flip it on return.
    return isNegative ? result : -result;
}

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