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/*
* 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.rows;
import org.apache.cassandra.db.PartitionColumns;
import org.apache.cassandra.db.filter.ColumnFilter;
import org.apache.cassandra.db.transform.Transformation;
/**
* Function to skip cells (from an iterator) that are not part of those queried by the user
* according to the provided {@code ColumnFilter}. See {@link UnfilteredRowIterators#withOnlyQueriedData}
* for more details.
*/
public class WithOnlyQueriedData> extends Transformation
{
private final ColumnFilter filter;
public WithOnlyQueriedData(ColumnFilter filter)
{
this.filter = filter;
}
@Override
protected PartitionColumns applyToPartitionColumns(PartitionColumns columns)
{
return filter.queriedColumns();
}
@Override
protected Row applyToStatic(Row row)
{
return row.withOnlyQueriedData(filter);
}
@Override
protected Row applyToRow(Row row)
{
return row.withOnlyQueriedData(filter);
}
};