org.apache.cassandra.db.filter
Class QueryFilter
java.lang.Object
org.apache.cassandra.db.filter.QueryFilter
public class QueryFilter
- extends java.lang.Object
Method Summary |
void |
collateColumns(ColumnFamily returnCF,
java.util.List<? extends CloseableIterator<IColumn>> toCollate,
int gcBefore)
|
void |
collateOnDiskAtom(ColumnFamily returnCF,
java.util.List<? extends CloseableIterator<OnDiskAtom>> toCollate,
int gcBefore)
|
static CloseableIterator<IColumn> |
gatherTombstones(ColumnFamily returnCF,
CloseableIterator<OnDiskAtom> iter)
Given an iterator of on disk atom, returns an iterator that filters the tombstone range
markers adding them to returnCF and returns the normal column. |
java.lang.String |
getColumnFamilyName()
|
static QueryFilter |
getIdentityFilter(DecoratedKey key,
QueryPath path)
return a QueryFilter object that includes every column in the row. |
OnDiskAtomIterator |
getMemtableColumnIterator(ColumnFamily cf,
DecoratedKey key)
|
OnDiskAtomIterator |
getMemtableColumnIterator(Memtable memtable)
|
static QueryFilter |
getNamesFilter(DecoratedKey key,
QueryPath path,
java.nio.ByteBuffer column)
convenience method for creating a name filter matching a single column |
static QueryFilter |
getNamesFilter(DecoratedKey key,
QueryPath path,
java.util.SortedSet<java.nio.ByteBuffer> columns)
|
static QueryFilter |
getSliceFilter(DecoratedKey key,
QueryPath path,
java.nio.ByteBuffer start,
java.nio.ByteBuffer finish,
boolean reversed,
int limit)
|
ISSTableColumnIterator |
getSSTableColumnIterator(SSTableReader sstable)
|
ISSTableColumnIterator |
getSSTableColumnIterator(SSTableReader sstable,
FileDataInput file,
DecoratedKey key,
RowIndexEntry indexEntry)
|
static boolean |
isRelevant(IColumn column,
IColumnContainer container,
int gcBefore)
|
java.lang.String |
toString()
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
key
public final DecoratedKey key
path
public final QueryPath path
filter
public final IDiskAtomFilter filter
QueryFilter
public QueryFilter(DecoratedKey key,
QueryPath path,
IDiskAtomFilter filter)
getMemtableColumnIterator
public OnDiskAtomIterator getMemtableColumnIterator(Memtable memtable)
getMemtableColumnIterator
public OnDiskAtomIterator getMemtableColumnIterator(ColumnFamily cf,
DecoratedKey key)
getSSTableColumnIterator
public ISSTableColumnIterator getSSTableColumnIterator(SSTableReader sstable)
getSSTableColumnIterator
public ISSTableColumnIterator getSSTableColumnIterator(SSTableReader sstable,
FileDataInput file,
DecoratedKey key,
RowIndexEntry indexEntry)
collateOnDiskAtom
public void collateOnDiskAtom(ColumnFamily returnCF,
java.util.List<? extends CloseableIterator<OnDiskAtom>> toCollate,
int gcBefore)
collateColumns
public void collateColumns(ColumnFamily returnCF,
java.util.List<? extends CloseableIterator<IColumn>> toCollate,
int gcBefore)
gatherTombstones
public static CloseableIterator<IColumn> gatherTombstones(ColumnFamily returnCF,
CloseableIterator<OnDiskAtom> iter)
- Given an iterator of on disk atom, returns an iterator that filters the tombstone range
markers adding them to
returnCF
and returns the normal column.
getColumnFamilyName
public java.lang.String getColumnFamilyName()
isRelevant
public static boolean isRelevant(IColumn column,
IColumnContainer container,
int gcBefore)
getSliceFilter
public static QueryFilter getSliceFilter(DecoratedKey key,
QueryPath path,
java.nio.ByteBuffer start,
java.nio.ByteBuffer finish,
boolean reversed,
int limit)
- Parameters:
key
- the row to slicepath
- path to the level to slice at (CF or SuperColumn)start
- column to start slice at, inclusive; empty for "the first column"finish
- column to stop slice at, inclusive; empty for "the last column"reversed
- true to start with the largest column (as determined by configured sort order) instead of smallestlimit
- maximum number of non-deleted columns to return
- Returns:
- a QueryFilter object to satisfy the given slice criteria:
getIdentityFilter
public static QueryFilter getIdentityFilter(DecoratedKey key,
QueryPath path)
- return a QueryFilter object that includes every column in the row.
This is dangerous on large rows; avoid except for test code.
getNamesFilter
public static QueryFilter getNamesFilter(DecoratedKey key,
QueryPath path,
java.util.SortedSet<java.nio.ByteBuffer> columns)
- Parameters:
key
- the row to slicepath
- path to the level to slice at (CF or SuperColumn)columns
- the column names to restrict the results to, sorted in comparator order
- Returns:
- a QueryFilter object that will return columns matching the given names
getNamesFilter
public static QueryFilter getNamesFilter(DecoratedKey key,
QueryPath path,
java.nio.ByteBuffer column)
- convenience method for creating a name filter matching a single column
toString
public java.lang.String toString()
- Overrides:
toString
in class java.lang.Object
Copyright © 2012 The Apache Software Foundation