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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.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.net.MessagingService;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.FBUtilities;
public class NamesQueryFilter implements IDiskAtomFilter
{
public static final Serializer serializer = new Serializer();
public final SortedSet<ByteBuffer> columns;
// If true, getLiveCount will always return either 0 or 1. This uses the fact that we know
// CQL3 will never use a name filter with cell names spanning multiple CQL3 rows.
private final boolean countCQL3Rows;
public NamesQueryFilter(SortedSet<ByteBuffer> columns)
{
this(columns, false);
}
public NamesQueryFilter(SortedSet<ByteBuffer> columns, boolean countCQL3Rows)
{
this.columns = columns;
this.countCQL3Rows = countCQL3Rows;
}
public NamesQueryFilter(ByteBuffer column)
{
this(FBUtilities.singleton(column));
}
public NamesQueryFilter withUpdatedColumns(SortedSet<ByteBuffer> newColumns)
{
return new NamesQueryFilter(newColumns, countCQL3Rows);
}
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 int getLiveCount(ColumnFamily cf)
{
if (countCQL3Rows)
return cf.hasOnlyTombstones() ? 0 : 1;
int count = 0;
for (IColumn column : cf)
{
if (column.isLive())
count++;
}
return count;
}
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);
}
// If we talking against an older node, we have no way to tell him that we want to count CQL3 rows. This does mean that
// this node may return less data than required. The workaround being to upgrade all nodes.
if (version >= MessagingService.VERSION_12)
dos.writeBoolean(f.countCQL3Rows);
}
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));
boolean countCQL3Rows = version >= MessagingService.VERSION_12
? dis.readBoolean()
: false;
return new NamesQueryFilter(columns, countCQL3Rows);
}
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;
}
if (version >= MessagingService.VERSION_12)
size += sizes.sizeof(f.countCQL3Rows);
return size;
}
}
}