Example usage for java.nio ByteBuffer putFloat

Introduction

In this page you can find the example usage for java.nio ByteBuffer putFloat.

Prototype

public abstract ByteBuffer putFloat(float value);

Source Link

Document

Writes the given float to the current position and increases the position by 4.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ByteBuffer buf = ByteBuffer.allocate(100);

    // Put values of different types
    buf.putFloat(12.3F);

    // Reset position for reading
    buf.flip();/*from   ww  w . j av  a  2 s.c  om*/

    // Retrieve the values
    float f = buf.getFloat();

}

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From source file:Main.java

public static void main(String[] argv) throws Exception {
    ByteBuffer bbuf = ByteBuffer.allocate(10);
    int capacity = bbuf.capacity(); // 10
    System.out.println(capacity);
    bbuf.putFloat(123F);

    System.out.println(Arrays.toString(bbuf.array()));
}

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From source file:CTmousetrack.java

public static void main(String[] args) {

    String outLoc = new String("." + File.separator + "CTdata"); // Location of the base output data folder; only used when writing out CT data to a local folder
    String srcName = "CTmousetrack"; // name of the output CT source
    long blockPts = 10; // points per block flush
    long sampInterval = 10; // time between sampling updates, msec
    double trimTime = 0.0; // amount of data to keep (trim time), sec
    boolean debug = false; // turn on debug?

    // Specify the CT output connection
    CTWriteMode writeMode = CTWriteMode.LOCAL; // The selected mode for writing out CT data
    String serverHost = ""; // Server (FTP or HTTP/S) host:port
    String serverUser = ""; // Server (FTP or HTTPS) username
    String serverPassword = ""; // Server (FTP or HTTPS) password

    // For UDP output mode
    DatagramSocket udpServerSocket = null;
    InetAddress udpServerAddress = null;
    String udpHost = "";
    int udpPort = -1;

    // Concatenate all of the CTWriteMode types
    String possibleWriteModes = "";
    for (CTWriteMode wm : CTWriteMode.values()) {
        possibleWriteModes = possibleWriteModes + ", " + wm.name();
    }//from ww  w. j  av  a2  s . c om
    // Remove ", " from start of string
    possibleWriteModes = possibleWriteModes.substring(2);

    //
    // Argument processing using Apache Commons CLI
    //
    // 1. Setup command line options
    Options options = new Options();
    options.addOption("h", "help", false, "Print this message.");
    options.addOption(Option.builder("o").argName("base output dir").hasArg().desc(
            "Base output directory when writing data to local folder (i.e., this is the location of CTdata folder); default = \""
                    + outLoc + "\".")
            .build());
    options.addOption(Option.builder("s").argName("source name").hasArg()
            .desc("Name of source to write data to; default = \"" + srcName + "\".").build());
    options.addOption(Option.builder("b").argName("points per block").hasArg()
            .desc("Number of points per block; UDP output mode will use 1 point/block; default = "
                    + Long.toString(blockPts) + ".")
            .build());
    options.addOption(Option.builder("dt").argName("samp interval msec").hasArg()
            .desc("Sampling period in msec; default = " + Long.toString(sampInterval) + ".").build());
    options.addOption(Option.builder("t").argName("trim time sec").hasArg().desc(
            "Trim (ring-buffer loop) time (sec); this is only used when writing data to local folder; specify 0 for indefinite; default = "
                    + Double.toString(trimTime) + ".")
            .build());
    options.addOption(
            Option.builder("w").argName("write mode").hasArg()
                    .desc("Type of write connection; one of " + possibleWriteModes
                            + "; all but UDP mode write out to CT; default = " + writeMode.name() + ".")
                    .build());
    options.addOption(Option.builder("host").argName("host[:port]").hasArg()
            .desc("Host:port when writing via FTP, HTTP, HTTPS, UDP.").build());
    options.addOption(Option.builder("u").argName("username,password").hasArg()
            .desc("Comma-delimited username and password when writing to CT via FTP or HTTPS.").build());
    options.addOption("x", "debug", false, "Enable CloudTurbine debug output.");

    // 2. Parse command line options
    CommandLineParser parser = new DefaultParser();
    CommandLine line = null;
    try {
        line = parser.parse(options, args);
    } catch (ParseException exp) { // oops, something went wrong
        System.err.println("Command line argument parsing failed: " + exp.getMessage());
        return;
    }

    // 3. Retrieve the command line values
    if (line.hasOption("help")) { // Display help message and quit
        HelpFormatter formatter = new HelpFormatter();
        formatter.setWidth(120);
        formatter.printHelp("CTmousetrack", "", options,
                "NOTE: UDP output is a special non-CT output mode where single x,y points are sent via UDP to the specified host:port.");
        return;
    }

    outLoc = line.getOptionValue("o", outLoc);
    if (!outLoc.endsWith("\\") && !outLoc.endsWith("/")) {
        outLoc = outLoc + File.separator;
    }
    // Make sure the base output folder location ends in "CTdata"
    if (!outLoc.endsWith("CTdata\\") && !outLoc.endsWith("CTdata/")) {
        outLoc = outLoc + "CTdata" + File.separator;
    }

    srcName = line.getOptionValue("s", srcName);

    blockPts = Long.parseLong(line.getOptionValue("b", Long.toString(blockPts)));

    sampInterval = Long.parseLong(line.getOptionValue("dt", Long.toString(sampInterval)));

    trimTime = Double.parseDouble(line.getOptionValue("t", Double.toString(trimTime)));

    // Type of output connection
    String writeModeStr = line.getOptionValue("w", writeMode.name());
    boolean bMatch = false;
    for (CTWriteMode wm : CTWriteMode.values()) {
        if (wm.name().toLowerCase().equals(writeModeStr.toLowerCase())) {
            writeMode = wm;
            bMatch = true;
        }
    }
    if (!bMatch) {
        System.err.println("Unrecognized write mode, \"" + writeModeStr + "\"; write mode must be one of "
                + possibleWriteModes);
        System.exit(0);
    }
    if (writeMode != CTWriteMode.LOCAL) {
        // User must have specified the host
        // If FTP or HTTPS, they may also specify username/password
        serverHost = line.getOptionValue("host", serverHost);
        if (serverHost.isEmpty()) {
            System.err.println(
                    "When using write mode \"" + writeModeStr + "\", you must specify the server host.");
            System.exit(0);
        }
        if (writeMode == CTWriteMode.UDP) {
            // Force blockPts to be 1
            blockPts = 1;
            // User must have specified both host and port
            int colonIdx = serverHost.indexOf(':');
            if ((colonIdx == -1) || (colonIdx >= serverHost.length() - 1)) {
                System.err.println(
                        "For UDP output mode, both the host and port (<host>:<port>)) must be specified.");
                System.exit(0);
            }
            udpHost = serverHost.substring(0, colonIdx);
            String udpPortStr = serverHost.substring(colonIdx + 1);
            try {
                udpPort = Integer.parseInt(udpPortStr);
            } catch (NumberFormatException nfe) {
                System.err.println("The UDP port must be a positive integer.");
                System.exit(0);
            }
        }
        if ((writeMode == CTWriteMode.FTP) || (writeMode == CTWriteMode.HTTPS)) {
            String userpassStr = line.getOptionValue("u", "");
            if (!userpassStr.isEmpty()) {
                // This string should be comma-delimited username and password
                String[] userpassCSV = userpassStr.split(",");
                if (userpassCSV.length != 2) {
                    System.err.println("When specifying a username and password for write mode \""
                            + writeModeStr + "\", separate the username and password by a comma.");
                    System.exit(0);
                }
                serverUser = userpassCSV[0];
                serverPassword = userpassCSV[1];
            }
        }
    }

    debug = line.hasOption("debug");

    System.err.println("CTmousetrack parameters:");
    System.err.println("\toutput mode = " + writeMode.name());
    if (writeMode == CTWriteMode.UDP) {
        System.err.println("\twrite to " + udpHost + ":" + udpPort);
    } else {
        System.err.println("\tsource = " + srcName);
        System.err.println("\ttrim time = " + trimTime + " sec");
    }
    System.err.println("\tpoints per block = " + blockPts);
    System.err.println("\tsample interval = " + sampInterval + " msec");

    try {
        //
        // Setup CTwriter or UDP output
        //
        CTwriter ctw = null;
        CTinfo.setDebug(debug);
        if (writeMode == CTWriteMode.LOCAL) {
            ctw = new CTwriter(outLoc + srcName, trimTime);
            System.err.println("\tdata will be written to local folder \"" + outLoc + "\"");
        } else if (writeMode == CTWriteMode.FTP) {
            CTftp ctftp = new CTftp(srcName);
            try {
                ctftp.login(serverHost, serverUser, serverPassword);
            } catch (Exception e) {
                throw new IOException(
                        new String("Error logging into FTP server \"" + serverHost + "\":\n" + e.getMessage()));
            }
            ctw = ctftp; // upcast to CTWriter
            System.err.println("\tdata will be written to FTP server at " + serverHost);
        } else if (writeMode == CTWriteMode.HTTP) {
            // Don't send username/pw in HTTP mode since they will be unencrypted
            CThttp cthttp = new CThttp(srcName, "http://" + serverHost);
            ctw = cthttp; // upcast to CTWriter
            System.err.println("\tdata will be written to HTTP server at " + serverHost);
        } else if (writeMode == CTWriteMode.HTTPS) {
            CThttp cthttp = new CThttp(srcName, "https://" + serverHost);
            // Username/pw are optional for HTTPS mode; only use them if username is not empty
            if (!serverUser.isEmpty()) {
                try {
                    cthttp.login(serverUser, serverPassword);
                } catch (Exception e) {
                    throw new IOException(new String(
                            "Error logging into HTTP server \"" + serverHost + "\":\n" + e.getMessage()));
                }
            }
            ctw = cthttp; // upcast to CTWriter
            System.err.println("\tdata will be written to HTTPS server at " + serverHost);
        } else if (writeMode == CTWriteMode.UDP) {
            try {
                udpServerSocket = new DatagramSocket();
            } catch (SocketException se) {
                System.err.println("Error creating socket for UDP:\n" + se);
                System.exit(0);
            }
            try {
                udpServerAddress = InetAddress.getByName(udpHost);
            } catch (UnknownHostException uhe) {
                System.err.println("Error getting UDP server host address:\n" + uhe);
                System.exit(0);
            }
        }
        if (writeMode != CTWriteMode.UDP) {
            ctw.setBlockMode(blockPts > 1, blockPts > 1);
            ctw.autoFlush(0); // no autoflush
            ctw.autoSegment(1000);
        }

        // screen dims
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        double width = screenSize.getWidth();
        double height = screenSize.getHeight();

        // use Map for consolidated putData
        Map<String, Object> cmap = new LinkedHashMap<String, Object>();

        // loop and write some output
        for (int i = 0; i < 1000000; i++) { // go until killed
            long currentTime = System.currentTimeMillis();
            Point mousePos = MouseInfo.getPointerInfo().getLocation();
            float x_pt = (float) (mousePos.getX() / width); // normalize
            float y_pt = (float) ((height - mousePos.getY()) / height); // flip Y (so bottom=0)
            if (writeMode != CTWriteMode.UDP) {
                // CT output mode
                ctw.setTime(currentTime);
                cmap.clear();
                cmap.put("x", x_pt);
                cmap.put("y", y_pt);
                ctw.putData(cmap);
                if (((i + 1) % blockPts) == 0) {
                    ctw.flush();
                    System.err.print(".");
                }
            } else {
                // UDP output mode
                // We force blockPts to be 1 for UDP output mode, i.e. we "flush" the data every time
                // Write the following data (21 bytes total):
                //     header = "MOUSE", 5 bytes
                //     current time, long, 8 bytes
                //     2 floats (x,y) 4 bytes each, 8 bytes
                int len = 21;
                ByteBuffer bb = ByteBuffer.allocate(len);
                String headerStr = "MOUSE";
                bb.put(headerStr.getBytes("UTF-8"));
                bb.putLong(currentTime);
                bb.putFloat(x_pt);
                bb.putFloat(y_pt);
                // Might be able to use the following, but not sure:
                //     byte[] sendData = bb.array();
                byte[] sendData = new byte[len];
                bb.position(0);
                bb.get(sendData, 0, len);
                DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, udpServerAddress,
                        udpPort);
                try {
                    udpServerSocket.send(sendPacket);
                } catch (IOException e) {
                    System.err.println("Test server caught exception trying to send data to UDP client:\n" + e);
                }
                System.err.print(".");
            }
            try {
                Thread.sleep(sampInterval);
            } catch (Exception e) {
            }
            ;
        }
        if (writeMode != CTWriteMode.UDP) {
            ctw.flush(); // wrap up
        }
    } catch (Exception e) {
        System.err.println("CTmousetrack exception: " + e);
        e.printStackTrace();
    }
}

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From source file:com.alvermont.terraj.fracplanet.util.ByteBufferUtils.java

/**
 * The sizes of Java types are fixed and defined by the language spec so
 * this shouldn't be necessary but I'm going to do it anyway - so
 * there!//  w w  w .j  a  v a2s.  c  om
 *
 * @return The number of bytes occupied by a float value
 */
public static int sizeofFloat() {
    final ByteBuffer buffer = ByteBuffer.allocate(10);

    buffer.putFloat(0.0f);

    return buffer.position();
}

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From source file:org.apache.camel.converter.NIOConverter.java

@Converter
public static ByteBuffer toByteBuffer(Float value) {
    ByteBuffer buf = ByteBuffer.allocate(4);
    buf.putFloat(value);
    return buf;//from   w  ww.  j  a  v a2  s  .  com
}

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From source file:Main.java

public static Buffer fillBuffer(float[] array) {
    // Convert to floats because OpenGL doesnt work on doubles, and manually
    // casting each input value would take too much time.
    ByteBuffer bb = ByteBuffer.allocateDirect(4 * array.length); // each
    // float//from  w w  w .j  a v  a  2s  . com
    // takes 4
    // bytes
    bb.order(ByteOrder.LITTLE_ENDIAN);
    for (float d : array)
        bb.putFloat(d);
    bb.rewind();

    return bb;

}

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From source file:Main.java

public static Buffer fillBuffer(double[] array) {
    // Convert to floats because OpenGL doesnt work on doubles, and manually
    // casting each input value would take too much time.
    ByteBuffer bb = ByteBuffer.allocateDirect(4 * array.length); // each
    // float//from  w  ww .  j  a v  a 2s  . com
    // takes 4
    // bytes
    bb.order(ByteOrder.LITTLE_ENDIAN);
    for (double d : array)
        bb.putFloat((float) d);
    bb.rewind();

    return bb;

}

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From source file:org.deegree.coverage.tools.RasterCommandUtils.java

/**
 * Parse a background value which is either a 0xdecafbad hex value or a float value. Float values will be returned
 * as a 4-byte array.//from w ww  .  j a  va2  s.c om
 *
 * @param background
 * @return a byte array with the parsed value
 * @throws ParseException
 */
public static byte[] parseBackgroundValue(String background) throws ParseException {

    if (background.toLowerCase().startsWith("0x")) {
        byte[] result = null;
        String hexValues = background.substring(2);
        try {
            if (hexValues.length() == 3 || hexValues.length() == 4) {
                result = new byte[hexValues.length()];
                for (int i = 0; i < result.length; i++) {
                    result[i] = parseHexToByte("" + hexValues.charAt(i) + hexValues.charAt(i));
                }
            } else if (hexValues.length() == 6 || hexValues.length() == 8) {
                result = new byte[hexValues.length() / 2];
                for (int i = 0; i < result.length; i++) {
                    result[i] = parseHexToByte("" + hexValues.charAt(i * 2) + hexValues.charAt(i * 2 + 1));
                }
            } else {
                throw new ParseException("not a valid hex color value (like 0xff0, or 0x0ab4f8)");
            }
        } catch (NumberFormatException ex) {
            throw new ParseException("not a valid hex color value (like 0xff0, or 0x0ab4f8)");
        }

        return result;
    }
    ByteBuffer tmp = ByteBuffer.allocate(4);
    tmp.putFloat(Float.parseFloat(background));
    return tmp.array();
}

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From source file:ConversionUtil.java

public static byte[] convertToByteArray(float value) {
    byte[] bytes = new byte[4];
    ByteBuffer buffer = ByteBuffer.allocate(bytes.length);
    buffer.putFloat(value);
    return buffer.array();
    // buffer.get(bytes);
    // return bytes;
    // return convertToByteArray(Float.floatToIntBits(value));
}

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From source file:org.mcisb.util.math.MathUtils.java

/**
 * /* w w w.  j  ava 2  s. c  o  m*/
 * 
 * @param values
 * @param bigEndian
 * @return String
 */
public static String encode(final float[] values, final boolean bigEndian) {
    final byte[] byteArray = new byte[values.length * FLOAT_LENGTH];
    ByteBuffer buffer = ByteBuffer.wrap(byteArray);
    buffer = buffer.order(bigEndian ? ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN);

    for (int i = 0; i < values.length; i++) {
        buffer.putFloat(values[i]);
    }

    // make the base64 strings from the bytes
    return Base64.encode(buffer.array());
}

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