/**
* Produces a GTSWrapper whose values are those at ticks from the argument only clipped to
* [from,to]. The bucketization parameters are not modified
*
* @param wrapper Source wrapper
* @return A new wrapper
*/
public static GTSWrapper clip(GTSWrapper wrapper, long from, long to) {
GTSDecoder decoder = new GTSDecoder(wrapper.getBase(), ByteBuffer.wrap(unwrapEncoded(wrapper)));
GTSEncoder encoder =
wrapper.isSetKey()
? new GTSEncoder(wrapper.getBase(), wrapper.getKey())
: new GTSEncoder(wrapper.getBase());
while (decoder.next()) {
if (decoder.getTimestamp() >= from && decoder.getTimestamp() <= to) {
try {
encoder.addValue(
decoder.getTimestamp(),
decoder.getLocation(),
decoder.getElevation(),
decoder.getValue());
} catch (IOException ioe) {
return null;
}
}
}
GTSWrapper clipped = new GTSWrapper();
clipped.setBase(wrapper.getBase());
clipped.setBucketcount(wrapper.getBucketcount());
clipped.setBucketspan(wrapper.getBucketspan());
clipped.setCount(encoder.getCount());
clipped.setEncoded(encoder.getBytes());
clipped.setLastbucket(wrapper.getLastbucket());
clipped.setMetadata(new Metadata(wrapper.getMetadata()));
if (wrapper.isSetKey()) {
clipped.setKey(wrapper.getKey());
}
return clipped;
}
/**
* 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;
}
public static GTSDecoder fromGTSWrapperToGTSDecoder(GTSWrapper wrapper) {
byte[] unwrapped = unwrapEncoded(wrapper);
GTSDecoder decoder =
new GTSDecoder(wrapper.getBase(), ByteBuffer.wrap(unwrapped).order(ByteOrder.BIG_ENDIAN));
decoder.setMetadata(wrapper.getMetadata());
decoder.setCount(wrapper.getCount());
return decoder;
}
/**
* 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;
}