public void post(long timestamp, float value) throws IOException {
File file = getFile();
RandomAccessFile rdf = null;
try {
rdf = new RandomAccessFile(file, "rw");
// On vérifie que la longueur est cohérente
long len = rdf.length();
if (len > 0) {
int mod = (int) (len % DATA_LEN);
if (mod != 0) {
logger.warning(
"Taille de fichier incoherence ("
+ len / DATA_LEN
+ "x"
+ DATA_LEN
+ ", reste "
+ mod
+ "). retour a "
+ (len - mod));
len = len - mod;
}
if (timestamp < getLast(rdf).timestamp) {
logger.warning(
"la nouvelle valeur anterieure a la derniere (prev:"
+ sdf.format(new Date((long) last.timestamp * 1000))
+ " new:"
+ sdf.format(new Date((long) timestamp * 1000))
+ ")");
}
// Positionnement en fin de fichier
rdf.seek(len);
}
// On écrit l'enregistrement
if (timestamp > Integer.MAX_VALUE) {
logger.warning("timestamp tronqué : " + timestamp + "/" + (int) timestamp);
}
if (last == null) last = new Entry();
last.timestamp = (int) timestamp;
last.value = value;
logger.fine("write: " + value + "(" + sdf.format(new Date(timestamp * 1000)) + ")");
rdf.writeInt((int) last.timestamp);
rdf.writeFloat(last.value);
} finally {
if (rdf != null) rdf.close();
}
}
public static void main(String args[]) {
try {
String fname = "d:\\q.txt";
String mode;
// mode = "r";//r : file must exist
mode = "rw"; // rw : file will be created or opened
// open the file
RandomAccessFile raf = new RandomAccessFile(fname, mode);
/*
//seek and write demo
raf.seek(10);//position file r/w pointer at index 10 wrt BOF
//a seek beyond file size causes file to grow upto the seek value
raf.write(65);//raf.write('A');
*/
// r/w java datatypes
int i1, i2;
float f1, f2;
char c1, c2;
String s1, s2;
i1 = -10;
f1 = 1234.5678F;
c1 = 'q';
s1 = "hello files";
raf.seek(0); // reach BOF
raf.writeInt(i1);
raf.writeFloat(f1);
raf.writeChar(c1);
raf.writeUTF(s1);
raf.seek(0); // reach BOF
i2 = raf.readInt();
f2 = raf.readFloat();
c2 = raf.readChar();
s2 = raf.readUTF();
System.out.println(i2);
System.out.println(f2);
System.out.println(c2);
System.out.println(s2);
// close the file
raf.close();
} catch (IOException ex) {
System.out.println(ex); // ex converts into ex.toString()
}
} // main
private void append(SingleHit[] hits, String prefix, int chrom) throws IOException {
RandomAccessFile positionsRAF = new RandomAccessFile(getPositionsFname(prefix, chrom), "rw");
RandomAccessFile weightsRAF = new RandomAccessFile(getWeightsFname(prefix, chrom), "rw");
RandomAccessFile lasRAF = new RandomAccessFile(getLaSFname(prefix, chrom), "rw");
positionsRAF.seek(positionsRAF.length());
weightsRAF.seek(weightsRAF.length());
lasRAF.seek(lasRAF.length());
for (int i = 0; i < hits.length; i++) {
SingleHit h = hits[i];
positionsRAF.writeInt(h.pos);
weightsRAF.writeFloat(h.weight);
lasRAF.writeInt(makeLAS(h.length, h.strand));
}
positionsRAF.close();
weightsRAF.close();
lasRAF.close();
}
public static void appendData(File outfile, float[] data) throws IOException {
RandomAccessFile raFile = new RandomAccessFile(outfile, "rw");
try {
SacHeader header = new SacHeader(raFile);
if (header.getLeven() == FALSE
|| header.getIftype() == IRLIM
|| header.getIftype() == IAMPH) {
raFile.close();
throw new IOException("Can only append to evenly sampled sac files, ie only Y");
}
int origNpts = header.getNpts();
header.setNpts(header.getNpts() + data.length);
header.setE((header.getNpts() - 1) * header.getDelta());
raFile.seek(0);
header.writeHeader(raFile);
raFile.skipBytes(origNpts * 4); // four bytes per float
if (header.getByteOrder() == LITTLE_ENDIAN) {
// Phil Crotwell's solution:
// careful here as dos.writeFloat() will collapse all NaN floats
// to
// a single NaN value. But we are trying to write out byte
// swapped values
// so different floats that are all NaN are different values in
// the
// other byte order. Solution is to swap on the integer bits,
// not the float.
for (int i = 0; i < data.length; i++) {
raFile.writeInt(SacHeader.swapBytes(Float.floatToRawIntBits(data[i])));
}
} else {
for (int i = 0; i < data.length; i++) {
raFile.writeFloat(data[i]);
}
}
} finally {
raFile.close();
}
}
/**
* This writes the binary float to the file. Later, use readBinaryFloat to read the value from the
* file.
*/
public void writeBinaryFloat(int col, int row, float f) throws IOException {
raf.seek(row * nBytesPerRow + columnStartAt[col]);
raf.writeFloat(f);
}
/* @see java.io.DataOutput.writeFloat(float) */
public void writeFloat(float v) throws IOException {
raf.writeFloat(v);
}