Example usage for org.apache.commons.io.input SwappedDataInputStream SwappedDataInputStream

Introduction

In this page you can find the example usage for org.apache.commons.io.input SwappedDataInputStream SwappedDataInputStream.

Prototype

public SwappedDataInputStream(InputStream input) 

Source Link

Document

Constructs a SwappedDataInputStream.

Usage

From source file:odcplot.OdcPlot.java

/**
 * For binary input files from our frame reader set up the input stream
 * @return number of entries to read//from w  w w .j a v a 2  s  . co  m
 * @throws WebUtilException 
 */
private long setupFileReads() throws WebUtilException {
    setProgress("Scan input file for min/max GPS times.");
    File inFile = new File(infilename);
    long siz = inFile.length() / (Float.SIZE / 8) / 2; // convert bytes to # entries (time, val)
    if (!inFile.canRead()) {
        throw new WebUtilException("Can't open " + infilename + " for reading");
    }
    try {
        inStream = new SwappedDataInputStream(new FileInputStream(inFile));
        float minTime = Float.MAX_VALUE;
        float maxTime = -Float.MAX_VALUE;

        setProgress("Searhing for min/max time in input file.");
        int opct = 0;
        for (int i = 0; i < siz; i++) {
            int pct = (int) (100 * i / siz);
            if (pct > opct) {
                setProgress(pct, 100);
                opct = pct;
            }
            Float t = inStream.readFloat();
            Float d = inStream.readFloat();
            minTime = Math.min(minTime, t);
            maxTime = Math.max(maxTime, t);
        }
        startGPS = (int) (minTime * 24 * 3600);
        duration = (int) ((maxTime - minTime) * 24 * 3600);
        inStream.close();
        inStream = new SwappedDataInputStream(new FileInputStream(inFile));
    } catch (IOException ex) {
        throw new WebUtilException("Can't open " + infilename + " for reading");
    }

    return siz;
}

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From source file:spectrogram.Spectrogram.java

private void readAddRawData() throws WebUtilException, NDSException {
    if (rawDataFilename != null && !rawDataFilename.isEmpty()) {
        rawDataFile = new File(rawDataFilename);
    }//from   www .  j  a  v a 2  s.co m
    if (rawDataFile == null || !rawDataFile.canRead()) {
        throw new WebUtilException("Request for raw data but file cannot be read, or not set.");
    }
    long nSamples = rawDataFile.length() / (Float.SIZE / 8) / 2;
    try {

        inStream = new SwappedDataInputStream(new FileInputStream(rawDataFile));
        int startPos = 0;
        int blen = (int) Math.min(nSamples, 1024 * 1024);
        double[] rawDataBuffer = new double[blen];

        for (long n = 0; n < nSamples; n += blen) {
            int dlen = blen;
            if (n + blen > nSamples) {
                dlen = (int) (nSamples - n);
            }
            for (int i = 0; i < dlen; i++) {
                Float t = inStream.readFloat();
                Float d = inStream.readFloat();
                rawDataBuffer[i] = d;
            }
            addBuf(rawDataBuffer, (int) n, dlen);
        }
    } catch (IOException ex) {
        throw new WebUtilException("Error reading raw data file", ex);
    }

}

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From source file:spectrogram.Spectrogram.java

/**
 * For binary input files from our frame reader set up the input stream
 *
 * @return number of entries to read/* www .  j  a  v  a  2  s  .  co m*/
 * @throws WebUtilException
 */
private long setupFileReads(String infilename) throws WebUtilException {
    setProgress("Scan input file for min/max GPS times.");
    File inFile = new File(infilename);
    long siz = inFile.length() / (Float.SIZE / 8) / 2; // convert bytes to # entries (time, val)
    if (!inFile.canRead()) {
        throw new WebUtilException("Can't open " + infilename + " for reading");
    }
    try {
        inStream = new SwappedDataInputStream(new FileInputStream(inFile));
        float minTime = Float.MAX_VALUE;
        float maxTime = -Float.MAX_VALUE;

        setProgress("Searhing for min/max time in input file.");
        int opct = 0;
        for (int i = 0; i < siz; i++) {
            int pct = (int) (100 * i / siz);
            if (pct > opct) {
                setProgress(pct, 100);
                opct = pct;
            }
            Float t = inStream.readFloat();
            Float d = inStream.readFloat();
            minTime = Math.min(minTime, t);
            maxTime = Math.max(maxTime, t);
        }
        startGPS = (int) (minTime);
        duration = (int) (maxTime - minTime);
        inStream.close();
        inStream = new SwappedDataInputStream(new FileInputStream(inFile));
    } catch (IOException ex) {
        throw new WebUtilException("Can't open " + infilename + " for reading");
    }

    return siz;
}

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