Package 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

@Public
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.Filter

Filter.ReturnCode

Field Summary

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

comparator, op

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

reversed

Constructor Summary

Constructors

Constructor	Description
QualifierFilter(CompareOperator op, ByteArrayComparable qualifierComparator)	Constructor.

Method Summary

Modifier and Type	Method	Description
(package private) boolean	areSerializedFieldsEqual(Filter o)	Returns true if and only if the fields of the filter that are serialized are equal to the corresponding fields in other.
static Filter	createFilterFromArguments(ArrayList<byte[]> filterArguments)
boolean	equals(Object obj)
Filter.ReturnCode	filterCell(Cell c)	A way to filter based on the column family, column qualifier and/or the column value.
int	hashCode()
static QualifierFilter	parseFrom(byte[] pbBytes)	Parse a serialized representation of QualifierFilter
byte[]	toByteArray()	Returns The filter serialized using pb

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

compare, compareFamily, compareQualifier, compareRow, compareValue, convert, extractArguments, filterRowKey, getComparator, getCompareOperator, toString

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

filterAllRemaining, filterRow, filterRowCells, getNextCellHint, hasFilterRow, isFamilyEssential, reset, transformCell

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

isReversed, setReversed

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

QualifierFilter

public QualifierFilter(CompareOperator op,
 ByteArrayComparable qualifierComparator)

Constructor.

Parameters:

op - the compare op for column qualifier matching

qualifierComparator - the comparator for column qualifier matching

Method Details

filterCell

public Filter.ReturnCode filterCell(Cell c)

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, filterCell needs to be consistent with it. filterCell 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.

Overrides:

filterCell in class Filter

Parameters:

c - 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()

Returns The filter serialized using pb

Overrides:

toByteArray in class FilterBase

Returns:

The filter serialized using pb

parseFrom

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

Parse a serialized representation of QualifierFilter

Parameters:

pbBytes - A pb serialized QualifierFilter instance

Returns:

An instance of QualifierFilter made from bytes

Throws:

DeserializationException - if an error occurred

See Also:

• toByteArray()

areSerializedFieldsEqual

boolean areSerializedFieldsEqual(Filter o)

Returns true if and only if the fields of the filter that are serialized are equal to the corresponding fields in other. Used for testing.

Overrides:

areSerializedFieldsEqual in class CompareFilter

Returns:

true if and only if the fields of the filter that are serialized are equal to the corresponding fields in other. Used for testing.

equals

public boolean equals(Object obj)

Overrides:

equals in class CompareFilter

hashCode

public int hashCode()

Overrides:

hashCode in class CompareFilter