/**
* 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;
}
