package org.apache.cassandra.db;
/*
*
* 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.
*
*/
import java.io.DataOutput;
import java.io.IOException;
import java.io.DataInput;
import java.util.Collection;
import org.apache.cassandra.io.ICompactSerializer2;
import org.apache.cassandra.io.SSTableReader;
import org.apache.cassandra.db.marshal.AbstractType;
public class ColumnFamilySerializer implements ICompactSerializer2<ColumnFamily>
{
/*
* Serialized ColumnFamily format:
*
* [serialized for intra-node writes only, e.g. returning a query result]
* <cf name>
* <cf type [super or standard]>
* <cf comparator name>
* <cf subcolumn comparator name>
*
* [in sstable only]
* <column bloom filter>
* <sparse column index, start/finish columns every ColumnIndexSizeInKB of data>
*
* [always present]
* <local deletion time>
* <client-provided deletion time>
* <column count>
* <columns, serialized individually>
*/
public void serialize(ColumnFamily columnFamily, DataOutput dos)
{
try
{
if (columnFamily == null)
{
dos.writeUTF(""); // not a legal CF name
return;
}
dos.writeUTF(columnFamily.name());
dos.writeUTF(columnFamily.type_);
dos.writeUTF(columnFamily.getComparatorName());
dos.writeUTF(columnFamily.getSubComparatorName());
}
catch (IOException e)
{
throw new RuntimeException(e);
}
serializeForSSTable(columnFamily, dos);
}
public void serializeForSSTable(ColumnFamily columnFamily, DataOutput dos)
{
try
{
dos.writeInt(columnFamily.localDeletionTime.get());
dos.writeLong(columnFamily.markedForDeleteAt.get());
Collection<IColumn> columns = columnFamily.getSortedColumns();
dos.writeInt(columns.size());
for (IColumn column : columns)
{
columnFamily.getColumnSerializer().serialize(column, dos);
}
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
public void serializeWithIndexes(ColumnFamily columnFamily, DataOutput dos)
{
ColumnIndexer.serialize(columnFamily, dos);
serializeForSSTable(columnFamily, dos);
}
public ColumnFamily deserialize(DataInput dis) throws IOException
{
String cfName = dis.readUTF();
if (cfName.isEmpty())
return null;
ColumnFamily cf = deserializeFromSSTableNoColumns(cfName, dis.readUTF(), readComparator(dis), readComparator(dis), dis);
deserializeColumns(dis, cf);
return cf;
}
private void deserializeColumns(DataInput dis, ColumnFamily cf) throws IOException
{
int size = dis.readInt();
for (int i = 0; i < size; ++i)
{
IColumn column = cf.getColumnSerializer().deserialize(dis);
cf.addColumn(column);
}
}
private AbstractType readComparator(DataInput dis) throws IOException
{
String className = dis.readUTF();
if (className.equals(""))
{
return null;
}
try
{
return (AbstractType)Class.forName(className).getConstructor().newInstance();
}
catch (ClassNotFoundException e)
{
throw new RuntimeException("Unable to load comparator class '" + className + "'. probably this means you have obsolete sstables lying around", e);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
public ColumnFamily deserializeFromSSTableNoColumns(String name, String type, AbstractType comparator, AbstractType subComparator, DataInput input) throws IOException
{
ColumnFamily cf = new ColumnFamily(name, type, comparator, subComparator);
return deserializeFromSSTableNoColumns(cf, input);
}
public ColumnFamily deserializeFromSSTableNoColumns(ColumnFamily cf, DataInput input) throws IOException
{
cf.delete(input.readInt(), input.readLong());
return cf;
}
public ColumnFamily deserializeFromSSTable(SSTableReader sstable, DataInput file) throws IOException
{
ColumnFamily cf = sstable.makeColumnFamily();
deserializeFromSSTableNoColumns(cf, file);
deserializeColumns(file, cf);
return cf;
}
}