/**
* convert a GTSWrapper into GeoTimeSerie
*
* @param wrapper
* @return GeoTimeSerie
*/
public static GeoTimeSerie fromGTSWrapperToGTS(GTSWrapper wrapper) {
Metadata metadata = wrapper.getMetadata();
GeoTimeSerie gts = null;
if (null != wrapper.getEncoded()) {
byte[] bytes = null;
if (wrapper.isCompressed()) {
bytes = unwrapEncoded(wrapper);
} else {
bytes = wrapper.getEncoded();
}
ByteBuffer bb = ByteBuffer.wrap(bytes);
GTSDecoder decoder = new GTSDecoder(wrapper.getBase(), bb);
decoder.setCount(0 != wrapper.getCount() ? wrapper.getCount() : bytes.length / 10);
gts = decoder.decode();
} else {
gts = new GeoTimeSerie();
}
if (null == metadata) {
metadata = new Metadata();
}
gts.setMetadata(metadata);
return gts;
}
/**
* Method used to rewrap a GTSWrapper, typically to change the compression settings.
*
* @param wrapper
* @param compress
* @param compratio
* @return
*/
public static GTSWrapper rewrap(GTSWrapper wrapper, boolean compress, double compratio) {
byte[] unwrapped = unwrapEncoded(wrapper);
GTSEncoder encoder = new GTSEncoder(wrapper.getBase(), null, unwrapped);
GTSWrapper tmp = fromGTSEncoderToGTSWrapper(encoder, compress, compratio);
GTSWrapper rewrapped = new GTSWrapper(wrapper);
rewrapped.setCompressed(tmp.isCompressed());
rewrapped.setCompressionPasses(tmp.getCompressionPasses());
rewrapped.setEncoded(tmp.getEncoded());
return rewrapped;
}
/**
* Extract the encoded data, removing compression if needed
*
* @param wrapper from which to extract the encoded data
* @return the raw encoded data
*/
private static byte[] unwrapEncoded(GTSWrapper wrapper) {
if (!wrapper.isCompressed()) {
return wrapper.getEncoded();
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] bytes = wrapper.getEncoded();
int pass = wrapper.getCompressionPasses();
while (pass > 0) {
ByteArrayInputStream in = new ByteArrayInputStream(bytes);
baos.reset();
try {
GZIPInputStream gzis = new GZIPInputStream(in);
byte[] buf = new byte[1024];
while (true) {
int len = gzis.read(buf);
if (len < 0) {
break;
}
baos.write(buf, 0, len);
}
gzis.close();
} catch (IOException ioe) {
throw new RuntimeException("Invalid compressed content.");
}
bytes = baos.toByteArray();
pass--;
}
return bytes;
}
