org.apache.hadoop.hbase.filter

Class QualifierFilter

java.lang.Object

org.apache.hadoop.hbase.filter.Filter

org.apache.hadoop.hbase.filter.FilterBase

org.apache.hadoop.hbase.filter.CompareFilter

org.apache.hadoop.hbase.filter.QualifierFilter

@InterfaceAudience.Public
@InterfaceStability.Stable
public class QualifierFilter
extends CompareFilter

This filter is used to filter based on the column qualifier. It takes an operator (equal, greater, not equal, etc) and a byte [] comparator for the column qualifier portion of a key.

This filter can be wrapped with WhileMatchFilter and SkipFilter to add more control.

Multiple filters can be combined using FilterList.

If an already known column qualifier is looked for, use Get.addColumn(byte[], byte[]) directly rather than a filter.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hbase.filter.CompareFilter

CompareFilter.CompareOp

Nested classes/interfaces inherited from class org.apache.hadoop.hbase.filter.Filter

Filter.ReturnCode

Field Summary

Fields inherited from class org.apache.hadoop.hbase.filter.CompareFilter

comparator, compareOp

Fields inherited from class org.apache.hadoop.hbase.filter.Filter

reversed

Constructor Summary

Constructors

Constructor and Description
QualifierFilter(CompareFilter.CompareOp op, ByteArrayComparable qualifierComparator) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
static Filter	createFilterFromArguments(ArrayList<byte[]> filterArguments)
Filter.ReturnCode	filterKeyValue(Cell v) A way to filter based on the column family, column qualifier and/or the column value.
static QualifierFilter	parseFrom(byte[] pbBytes)
byte[]	toByteArray() Return length 0 byte array for Filters that don't require special serialization

Methods inherited from class org.apache.hadoop.hbase.filter.CompareFilter

doCompare, extractArguments, getComparator, getOperator, toString, transformCell

Methods inherited from class org.apache.hadoop.hbase.filter.FilterBase

filterAllRemaining, filterRow, filterRowCells, filterRowKey, getNextCellHint, getNextKeyHint, hasFilterRow, isFamilyEssential, reset, transform

Methods inherited from class org.apache.hadoop.hbase.filter.Filter

isReversed, setReversed

Methods inherited from class java.lang.Object

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

Constructor Detail

QualifierFilter

public QualifierFilter(CompareFilter.CompareOp op,
               ByteArrayComparable qualifierComparator)

Constructor.

Parameters:

op - the compare op for column qualifier matching

qualifierComparator - the comparator for column qualifier matching

Method Detail

filterKeyValue

public Filter.ReturnCode filterKeyValue(Cell v)

Description copied from class: Filter

A way to filter based on the column family, column qualifier and/or the column value. Return code is described below. This allows filters to filter only certain number of columns, then terminate without matching ever column. If filterRowKey returns true, filterKeyValue needs to be consistent with it. filterKeyValue can assume that filterRowKey has already been called for the row. If your filter returns ReturnCode.NEXT_ROW, it should return ReturnCode.NEXT_ROW until Filter.reset() is called just in case the caller calls for the next row. Concrete implementers can signal a failure condition in their code by throwing an IOException.

Specified by:

filterKeyValue in class Filter

Parameters:

v - the Cell in question

Returns:

code as described below

See Also:

Filter.ReturnCode

createFilterFromArguments

public static Filter createFilterFromArguments(ArrayList<byte[]> filterArguments)

toByteArray

public byte[] toByteArray()

Description copied from class: FilterBase

Return length 0 byte array for Filters that don't require special serialization

Overrides:

toByteArray in class FilterBase

Returns:

The filter serialized using pb

parseFrom

public static QualifierFilter parseFrom(byte[] pbBytes)
                                 throws DeserializationException

Parameters:

pbBytes - A pb serialized QualifierFilter instance

Returns:

An instance of QualifierFilter made from bytes

Throws:

DeserializationException

See Also:

toByteArray()