/*
* 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.filter;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Comparator;
import java.util.Iterator;
import java.util.SortedSet;
import java.util.TreeSet;
import org.apache.commons.lang.StringUtils;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.columniterator.ISSTableColumnIterator;
import org.apache.cassandra.db.columniterator.OnDiskAtomIterator;
import org.apache.cassandra.db.columniterator.SSTableNamesIterator;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.io.IVersionedSerializer;
import org.apache.cassandra.io.sstable.SSTableReader;
import org.apache.cassandra.io.util.FileDataInput;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.FBUtilities;
public class NamesQueryFilter implements IFilter
{
public static final Serializer serializer = new Serializer();
public final SortedSet<ByteBuffer> columns;
public NamesQueryFilter(SortedSet<ByteBuffer> columns)
{
this.columns = columns;
}
public NamesQueryFilter(ByteBuffer column)
{
this(FBUtilities.singleton(column));
}
public OnDiskAtomIterator getMemtableColumnIterator(ColumnFamily cf, DecoratedKey key)
{
return Memtable.getNamesIterator(key, cf, this);
}
public ISSTableColumnIterator getSSTableColumnIterator(SSTableReader sstable, DecoratedKey key)
{
return new SSTableNamesIterator(sstable, key, columns);
}
public ISSTableColumnIterator getSSTableColumnIterator(SSTableReader sstable, FileDataInput file, DecoratedKey key, RowIndexEntry indexEntry)
{
return new SSTableNamesIterator(sstable, file, key, columns, indexEntry);
}
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 comparator.columnComparator;
}
@Override
public String toString()
{
return "NamesQueryFilter(" +
"columns=" + StringUtils.join(columns, ",") +
')';
}
public boolean isReversed()
{
return false;
}
public void updateColumnsLimit(int newLimit)
{
}
public static class Serializer implements IVersionedSerializer<NamesQueryFilter>
{
public void serialize(NamesQueryFilter f, DataOutput dos, int version) throws IOException
{
dos.writeInt(f.columns.size());
for (ByteBuffer cName : f.columns)
{
ByteBufferUtil.writeWithShortLength(cName, dos);
}
}
public NamesQueryFilter deserialize(DataInput dis, int version) throws IOException
{
throw new UnsupportedOperationException();
}
public NamesQueryFilter deserialize(DataInput dis, int version, AbstractType comparator) throws IOException
{
int size = dis.readInt();
SortedSet<ByteBuffer> columns = new TreeSet<ByteBuffer>(comparator);
for (int i = 0; i < size; ++i)
columns.add(ByteBufferUtil.readWithShortLength(dis));
return new NamesQueryFilter(columns);
}
public long serializedSize(NamesQueryFilter f, int version)
{
TypeSizes sizes = TypeSizes.NATIVE;
int size = sizes.sizeof(f.columns.size());
for (ByteBuffer cName : f.columns)
{
int cNameSize = cName.remaining();
size += sizes.sizeof((short) cNameSize) + cNameSize;
}
return size;
}
}
}