/*
* Copyright 2014, Stratio.
*
* Licensed 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 com.stratio.cassandra.index;
import com.stratio.cassandra.index.schema.ColumnMapper;
import com.stratio.cassandra.index.schema.Columns;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.db.Cell;
import org.apache.cassandra.db.ColumnFamily;
import org.apache.cassandra.db.Row;
import org.apache.cassandra.db.composites.CellName;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.db.marshal.CollectionType;
import java.nio.ByteBuffer;
import java.util.Iterator;
/**
* @author Andres de la Pena <adelapena@stratio.com>
*/
public class RegularCellsMapper
{
/**
* The column family metadata.
*/
private final CFMetaData metadata;
/**
* Builds a new {@link RegularCellsMapper} for the specified column family metadata.
*
* @param metadata The column family metadata.
*/
private RegularCellsMapper(CFMetaData metadata)
{
this.metadata = metadata;
}
/**
* Returns a new {@link RegularCellsMapper} for the specified column family metadata.
*
* @param metadata The column family metadata.
* @return A new {@link RegularCellsMapper} for the specified column family metadata.
*/
public static RegularCellsMapper instance(CFMetaData metadata)
{
return new RegularCellsMapper(metadata);
}
@SuppressWarnings("rawtypes")
public Columns columns(Row row)
{
ColumnFamily columnFamily = row.cf;
Columns columns = new Columns();
// Get row's columns iterator skipping clustering column
Iterator<Cell> cellIterator = columnFamily.iterator();
cellIterator.next();
// Stuff for grouping collection columns (sets, lists and maps)
String name;
CollectionType collectionType;
while (cellIterator.hasNext())
{
Cell cell = cellIterator.next();
CellName cellName = cell.name();
ColumnDefinition columnDefinition = metadata.getColumnDefinition(cellName);
if (columnDefinition == null)
{
continue;
}
AbstractType<?> valueType = columnDefinition.type;
ByteBuffer cellValue = cell.value();
name = cellName.cql3ColumnName(metadata).toString();
if (valueType.isCollection())
{
collectionType = (CollectionType<?>) valueType;
switch (collectionType.kind)
{
case SET:
{
AbstractType<?> type = collectionType.nameComparator();
ByteBuffer value = cellName.collectionElement();
columns.add(ColumnMapper.column(name, value, type));
break;
}
case LIST:
{
AbstractType<?> type = collectionType.valueComparator();
columns.add(ColumnMapper.column(name, cellValue, type));
break;
}
case MAP:
{
AbstractType<?> type = collectionType.valueComparator();
ByteBuffer keyValue = cellName.collectionElement();
AbstractType<?> keyType = collectionType.nameComparator();
String nameSufix = keyType.compose(keyValue).toString();
columns.add(ColumnMapper.column(name, nameSufix, cellValue, type));
break;
}
}
}
else
{
columns.add(ColumnMapper.column(name, cellValue, valueType));
}
}
return columns;
}
}