package org.apache.cassandra.db.filter;
/*
*
* 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
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import java.nio.ByteBuffer;
import java.util.Comparator;
import java.util.Iterator;
import java.util.SortedSet;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.columniterator.IColumnIterator;
import org.apache.cassandra.db.columniterator.SSTableNamesIterator;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.io.sstable.SSTableReader;
import org.apache.cassandra.io.util.FileDataInput;
import org.apache.cassandra.utils.FBUtilities;
public class NamesQueryFilter implements IFilter
{
public final SortedSet<ByteBuffer> columns;
public NamesQueryFilter(SortedSet<ByteBuffer> columns)
{
this.columns = columns;
}
public NamesQueryFilter(ByteBuffer column)
{
this(FBUtilities.singleton(column));
}
public IColumnIterator getMemtableColumnIterator(ColumnFamily cf, DecoratedKey key, AbstractType comparator)
{
return Memtable.getNamesIterator(key, cf, this);
}
public IColumnIterator getSSTableColumnIterator(SSTableReader sstable, DecoratedKey key)
{
return new SSTableNamesIterator(sstable, key, columns);
}
public IColumnIterator getSSTableColumnIterator(SSTableReader sstable, FileDataInput file, DecoratedKey key)
{
return new SSTableNamesIterator(sstable, file, key, columns);
}
public SuperColumn filterSuperColumn(SuperColumn superColumn, int gcBefore)
{
for (IColumn column : superColumn.getSubColumns())
{
if (!columns.contains(column.name()) || !QueryFilter.isRelevant(column, superColumn, gcBefore))
{
superColumn.remove(column.name());
}
}
return superColumn;
}
public void collectReducedColumns(IColumnContainer container, Iterator<IColumn> reducedColumns, int gcBefore)
{
while (reducedColumns.hasNext())
{
IColumn column = reducedColumns.next();
if (QueryFilter.isRelevant(column, container, gcBefore))
container.addColumn(column);
}
}
public Comparator<IColumn> getColumnComparator(AbstractType comparator)
{
return QueryFilter.getColumnComparator(comparator);
}
}