Example 1 with Encoding
use of org.apache.parquet.format.Encoding in project parquet-mr by apache.
the class ParquetMetadataConverter method fromFormatEncodings.
// Visible for testing
Set<org.apache.parquet.column.Encoding> fromFormatEncodings(List<Encoding> encodings) {
Set<org.apache.parquet.column.Encoding> converted = new HashSet<org.apache.parquet.column.Encoding>();
for (Encoding encoding : encodings) {
converted.add(getEncoding(encoding));
}
// make converted unmodifiable, drop reference to modifiable copy
converted = Collections.unmodifiableSet(converted);
// atomically update the cache
Set<org.apache.parquet.column.Encoding> cached = cachedEncodingSets.putIfAbsent(converted, converted);
if (cached == null) {
// cached == null signifies that converted was *not* in the cache previously
// so we can return converted instead of throwing it away, it has now
// been cached
cached = converted;
}
return cached;
}