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A fork of the Apache Cassandra Project ready to embed Elasticsearch.
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.cassandra.db.transform;
import org.apache.cassandra.db.DeletionPurger;
import org.apache.cassandra.db.rows.*;
final class Filter extends Transformation
{
private final boolean filterEmpty; // generally maps to !isForThrift, but also false for direct row filtration
private final int nowInSec;
public Filter(boolean filterEmpty, int nowInSec)
{
this.filterEmpty = filterEmpty;
this.nowInSec = nowInSec;
}
@Override
protected RowIterator applyToPartition(BaseRowIterator iterator)
{
RowIterator filtered = iterator instanceof UnfilteredRows
? new FilteredRows(this, (UnfilteredRows) iterator)
: new FilteredRows((UnfilteredRowIterator) iterator, this);
if (filterEmpty && closeIfEmpty(filtered))
return null;
return filtered;
}
@Override
protected Row applyToStatic(Row row)
{
if (row.isEmpty())
return Rows.EMPTY_STATIC_ROW;
row = row.purge(DeletionPurger.PURGE_ALL, nowInSec);
return row == null ? Rows.EMPTY_STATIC_ROW : row;
}
@Override
protected Row applyToRow(Row row)
{
return row.purge(DeletionPurger.PURGE_ALL, nowInSec);
}
@Override
protected RangeTombstoneMarker applyToMarker(RangeTombstoneMarker marker)
{
return null;
}
private static boolean closeIfEmpty(BaseRowIterator iter)
{
if (iter.isEmpty())
{
iter.close();
return true;
}
return false;
}
}