private static double[] loadRawDouble(String source) throws Exception {
System.out.println("Loading data...");
long time = System.nanoTime();
RandomAccessFile raf = new RandomAccessFile(source, "r");
FileChannel inChannel = raf.getChannel();
MappedByteBuffer buffer = inChannel.map(FileChannel.MapMode.READ_ONLY, 0, inChannel.size());
DoubleBuffer dbuf = buffer.asDoubleBuffer();
double[] dest = new double[dbuf.remaining()];
dbuf.get(dest);
long elapsed = System.nanoTime() - time;
System.out.println("Load complete... " + (elapsed / 1000000) + "ms");
raf.close();
return dest;
}
public void readFile(File file) {
try {
FileChannel channel = new FileInputStream(file).getChannel();
MappedByteBuffer bb = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
IntBuffer ib = bb.asIntBuffer();
_nx = ib.get();
_ny = ib.get();
_nz = ib.get();
bb.position(4 * ib.position());
DoubleBuffer db = bb.asDoubleBuffer();
if (_a == null || _a.length != _nx * _ny * _nz) _a = new double[_nx * _ny * _nz];
db.get(_a);
channel.close();
} catch (IOException e) {
System.out.println(e.getMessage());
}
}