org.apache.cassandra.db.filter
Class SliceQueryFilter

java.lang.Object
  org.apache.cassandra.db.filter.QueryFilter
      org.apache.cassandra.db.filter.SliceQueryFilter

Direct Known Subclasses:

IdentityQueryFilter

public class SliceQueryFilter
extends QueryFilter

Field Summary

int	count
byte[]	finish
boolean	reversed
byte[]	start

Fields inherited from class org.apache.cassandra.db.filter.QueryFilter

key, path

Constructor Summary

SliceQueryFilter(java.lang.String key, QueryPath columnParent, byte[] start, byte[] finish, boolean reversed, int count)

Method Summary

void	collectReducedColumns(IColumnContainer container, java.util.Iterator<IColumn> reducedColumns, int gcBefore) collects columns from reducedColumns into returnCF.
SuperColumn	filterSuperColumn(SuperColumn superColumn, int gcBefore) subcolumns of a supercolumn are unindexed, so to pick out parts of those we operate in-memory.
java.util.Comparator<IColumn>	getColumnComparator(AbstractType comparator)
ColumnIterator	getMemColumnIterator(Memtable memtable, ColumnFamily cf, AbstractType comparator) returns an iterator that returns columns from the given memtable matching the Filter criteria in sorted order.
ColumnIterator	getSSTableColumnIterator(SSTableReader sstable) returns an iterator that returns columns from the given SSTable matching the Filter criteria in sorted order.

Methods inherited from class org.apache.cassandra.db.filter.QueryFilter

collectCollatedColumns, getColumnFamilyName, getMemColumnIterator, isRelevant

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

start

public final byte[] start

finish

public final byte[] finish

reversed

public final boolean reversed

count

public final int count

Constructor Detail

SliceQueryFilter

public SliceQueryFilter(java.lang.String key,
                        QueryPath columnParent,
                        byte[] start,
                        byte[] finish,
                        boolean reversed,
                        int count)

Method Detail

getMemColumnIterator

public ColumnIterator getMemColumnIterator(Memtable memtable,
                                           ColumnFamily cf,
                                           AbstractType comparator)

Description copied from class: QueryFilter

returns an iterator that returns columns from the given memtable matching the Filter criteria in sorted order.

Specified by:

getMemColumnIterator in class QueryFilter

getSSTableColumnIterator

public ColumnIterator getSSTableColumnIterator(SSTableReader sstable)
                                        throws java.io.IOException

Description copied from class: QueryFilter

returns an iterator that returns columns from the given SSTable matching the Filter criteria in sorted order.

Specified by:

getSSTableColumnIterator in class QueryFilter

Throws:

java.io.IOException

filterSuperColumn

public SuperColumn filterSuperColumn(SuperColumn superColumn,
                                     int gcBefore)

Description copied from class: QueryFilter

subcolumns of a supercolumn are unindexed, so to pick out parts of those we operate in-memory.

Specified by:

filterSuperColumn in class QueryFilter

Parameters:

superColumn - may be modified by filtering op.

getColumnComparator

public java.util.Comparator<IColumn> getColumnComparator(AbstractType comparator)

Overrides:

getColumnComparator in class QueryFilter

collectReducedColumns

public void collectReducedColumns(IColumnContainer container,
                                  java.util.Iterator<IColumn> reducedColumns,
                                  int gcBefore)

Description copied from class: QueryFilter

collects columns from reducedColumns into returnCF. Termination is determined by the filter code, which should have some limit on the number of columns to avoid running out of memory on large rows.

Specified by:

collectReducedColumns in class QueryFilter