Example usage for java.nio ByteBuffer putDouble

Introduction

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

Prototype

public abstract ByteBuffer putDouble(int index, double value);

Source Link

Document

Writes the given double to the specified index of this buffer.

Usage

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.putDouble(2, 123);

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

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From source file:edu.mbl.jif.imaging.mmtiff.MultipageTiffWriter.java

/**
 * writes channel LUTs and display ranges for composite mode Could also be
 * expanded to write ROIs, file info, slice labels, and overlays
 *//*from  w  w  w. j av  a  2s  .  c om*/
private void writeImageJMetadata(int numChannels, String summaryComment) throws IOException {
    String info = summaryMDString_;
    if (summaryComment != null && summaryComment.length() > 0) {
        info = "Acquisition comments: \n" + summaryComment + "\n\n\n" + summaryMDString_;
    }
    //size entry (4 bytes) + 4 bytes file info size + 4 bytes for channel display 
    //ranges length + 4 bytes per channel LUT
    int mdByteCountsBufferSize = 4 + 4 + 4 + 4 * numChannels;
    int bufferPosition = 0;

    ByteBuffer mdByteCountsBuffer = ByteBuffer.allocate(mdByteCountsBufferSize).order(BYTE_ORDER);

    //nTypes is number actually written among: fileInfo, slice labels, display ranges, channel LUTS,
    //slice labels, ROI, overlay, and # of extra metadata entries
    int nTypes = 3; //file info, display ranges, and channel LUTs
    int mdBufferSize = 4 + nTypes * 8;

    //Header size: 4 bytes for magic number + 8 bytes for label (int) and count (int) of each type
    mdByteCountsBuffer.putInt(bufferPosition, 4 + nTypes * 8);
    bufferPosition += 4;

    //2 bytes per a character of file info
    mdByteCountsBuffer.putInt(bufferPosition, 2 * info.length());
    bufferPosition += 4;
    mdBufferSize += info.length() * 2;

    //display ranges written as array of doubles (min, max, min, max, etc)
    mdByteCountsBuffer.putInt(bufferPosition, numChannels * 2 * 8);
    bufferPosition += 4;
    mdBufferSize += numChannels * 2 * 8;

    for (int i = 0; i < numChannels; i++) {
        //768 bytes per LUT
        mdByteCountsBuffer.putInt(bufferPosition, 768);
        bufferPosition += 4;
        mdBufferSize += 768;
    }

    //Header (1) File info (1) display ranges (1) LUTS (1 per channel)
    int numMDEntries = 3 + numChannels;
    ByteBuffer ifdCountAndValueBuffer = ByteBuffer.allocate(8).order(BYTE_ORDER);
    ifdCountAndValueBuffer.putInt(0, numMDEntries);
    ifdCountAndValueBuffer.putInt(4, (int) filePosition_);
    fileChannel_.write(ifdCountAndValueBuffer, ijMetadataCountsTagPosition_ + 4);

    fileChannel_.write(mdByteCountsBuffer, filePosition_);
    filePosition_ += mdByteCountsBufferSize;

    //Write metadata types and counts
    ByteBuffer mdBuffer = ByteBuffer.allocate(mdBufferSize).order(BYTE_ORDER);
    bufferPosition = 0;

    //All the ints declared below are non public field in TiffDecoder
    final int ijMagicNumber = 0x494a494a;
    mdBuffer.putInt(bufferPosition, ijMagicNumber);
    bufferPosition += 4;

    //Write ints for each IJ metadata field and its count
    final int fileInfo = 0x696e666f;
    mdBuffer.putInt(bufferPosition, fileInfo);
    bufferPosition += 4;
    mdBuffer.putInt(bufferPosition, 1);
    bufferPosition += 4;

    final int displayRanges = 0x72616e67;
    mdBuffer.putInt(bufferPosition, displayRanges);
    bufferPosition += 4;
    mdBuffer.putInt(bufferPosition, 1);
    bufferPosition += 4;

    final int luts = 0x6c757473;
    mdBuffer.putInt(bufferPosition, luts);
    bufferPosition += 4;
    mdBuffer.putInt(bufferPosition, numChannels);
    bufferPosition += 4;

    //write actual metadata
    //FileInfo
    for (char c : info.toCharArray()) {
        mdBuffer.putChar(bufferPosition, c);
        bufferPosition += 2;
    }
    try {
        JSONArray channels = masterMPTiffStorage_.getDisplayAndComments().getJSONArray("Channels");
        JSONObject channelSetting;
        for (int i = 0; i < numChannels; i++) {
            channelSetting = channels.getJSONObject(i);
            //Display Ranges: For each channel, write min then max
            mdBuffer.putDouble(bufferPosition, channelSetting.getInt("Min"));
            bufferPosition += 8;
            mdBuffer.putDouble(bufferPosition, channelSetting.getInt("Max"));
            bufferPosition += 8;
        }

        //LUTs
        for (int i = 0; i < numChannels; i++) {
            channelSetting = channels.getJSONObject(i);
            LUT lut = ImageUtils.makeLUT(new Color(channelSetting.getInt("Color")),
                    channelSetting.getDouble("Gamma"));
            for (byte b : lut.getBytes()) {
                mdBuffer.put(bufferPosition, b);
                bufferPosition++;
            }
        }
    } catch (JSONException ex) {
        ReportingUtils.logError(
                "Problem with displayAndComments: Couldn't write ImageJ display settings as a result");
    }

    ifdCountAndValueBuffer = ByteBuffer.allocate(8).order(BYTE_ORDER);
    ifdCountAndValueBuffer.putInt(0, mdBufferSize);
    ifdCountAndValueBuffer.putInt(4, (int) filePosition_);
    fileChannel_.write(ifdCountAndValueBuffer, ijMetadataTagPosition_ + 4);

    fileChannel_.write(mdBuffer, filePosition_);
    filePosition_ += mdBufferSize;
}

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