org.apache.cassandra.db.transform.FilteredPartitions Maven / Gradle / Ivy
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package org.apache.cassandra.db.transform;
import org.apache.cassandra.db.partitions.BasePartitionIterator;
import org.apache.cassandra.db.partitions.PartitionIterator;
import org.apache.cassandra.db.partitions.UnfilteredPartitionIterator;
import org.apache.cassandra.db.rows.RowIterator;
public final class FilteredPartitions extends BasePartitions> implements PartitionIterator
{
// wrap basic iterator for transformation
FilteredPartitions(PartitionIterator input)
{
super(input);
}
// wrap basic unfiltered iterator for transformation, applying filter as first transformation
FilteredPartitions(UnfilteredPartitionIterator input, Filter filter)
{
super(input);
add(filter);
}
// copy from an UnfilteredPartitions, applying a filter to convert it
FilteredPartitions(Filter filter, UnfilteredPartitions copyFrom)
{
super(copyFrom);
add(filter);
}
/**
* Filter any RangeTombstoneMarker from the iterator's iterators, transforming it into a PartitionIterator.
*/
public static FilteredPartitions filter(UnfilteredPartitionIterator iterator, int nowInSecs)
{
FilteredPartitions filtered = filter(iterator,
new Filter(nowInSecs,
iterator.metadata().enforceStrictLiveness()));
return iterator.isForThrift()
? filtered
: (FilteredPartitions) Transformation.apply(filtered, new EmptyPartitionsDiscarder());
}
public static FilteredPartitions filter(UnfilteredPartitionIterator iterator, Filter filter)
{
return iterator instanceof UnfilteredPartitions
? new FilteredPartitions(filter, (UnfilteredPartitions) iterator)
: new FilteredPartitions(iterator, filter);
}
}