Package org.apache.hadoop.hbase.filter

Class MultipleColumnPrefixFilter

java.lang.Object

org.apache.hadoop.hbase.filter.Filter

org.apache.hadoop.hbase.filter.FilterBase

org.apache.hadoop.hbase.filter.MultipleColumnPrefixFilter

All Implemented Interfaces:

HintingFilter

@Public
public class MultipleColumnPrefixFilter
extends FilterBase
implements HintingFilter

This filter is used for selecting only those keys with columns that matches a particular prefix. For example, if prefix is 'an', it will pass keys will columns like 'and', 'anti' but not keys with columns like 'ball', 'act'.

Nested Class Summary

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

Filter.ReturnCode

Field Summary

Fields

Modifier and Type	Field	Description
protected byte[]	hint
private static final org.slf4j.Logger	LOG
private static final int	MAX_LOG_PREFIXES
protected TreeSet<byte[]>	sortedPrefixes

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

reversed

Constructor Summary

Constructors

Constructor	Description
MultipleColumnPrefixFilter(byte[][] prefixes)

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)
TreeSet<byte[]>	createTreeSet()
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.
Filter.ReturnCode	filterColumn(Cell cell)
boolean	filterRowKey(Cell cell)	Filters a row based on the row key.
Cell	getNextCellHint(Cell cell)	Filters that are not sure which key must be next seeked to, can inherit this implementation that, by default, returns a null Cell.
byte[][]	getPrefix()
int	hashCode()
static MultipleColumnPrefixFilter	parseFrom(byte[] pbBytes)	Parse a serialized representation of MultipleColumnPrefixFilter
byte[]	toByteArray()	Returns The filter serialized using pb
String	toString()	Return filter's info for debugging and logging purpose.
protected String	toString(int maxPrefixes)

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

filterAllRemaining, filterRow, filterRowCells, 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

Field Details

LOG

private static final org.slf4j.Logger LOG

hint

protected byte[] hint

sortedPrefixes

protected TreeSet<byte[]> sortedPrefixes

MAX_LOG_PREFIXES

private static final int MAX_LOG_PREFIXES

See Also:

• Constant Field Values

Constructor Details

MultipleColumnPrefixFilter

public MultipleColumnPrefixFilter(byte[][] prefixes)

Method Details

getPrefix

public byte[][] getPrefix()

filterRowKey

public boolean filterRowKey(Cell cell)
                     throws IOException

Description copied from class: Filter

Filters a row based on the row key. If this returns true, the entire row will be excluded. If false, each KeyValue in the row will be passed to Filter.filterCell(Cell) below. If Filter.filterAllRemaining() returns true, then Filter.filterRowKey(Cell) should also return true. Concrete implementers can signal a failure condition in their code by throwing an IOException.

Overrides:

filterRowKey in class FilterBase

Parameters:

cell - The first cell coming in the new row

Returns:

true, remove entire row, false, include the row (maybe).

Throws:

IOException - in case an I/O or an filter specific failure needs to be signaled.

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

filterColumn

public Filter.ReturnCode filterColumn(Cell cell)

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 MultipleColumnPrefixFilter parseFrom(byte[] pbBytes)
                                            throws DeserializationException

Parse a serialized representation of MultipleColumnPrefixFilter

Parameters:

pbBytes - A pb serialized MultipleColumnPrefixFilter instance

Returns:

An instance of MultipleColumnPrefixFilter 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 FilterBase

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.

getNextCellHint

public Cell getNextCellHint(Cell cell)

Description copied from class: FilterBase

Filters that are not sure which key must be next seeked to, can inherit this implementation that, by default, returns a null Cell. If the filter returns the match code SEEK_NEXT_USING_HINT, then it should also tell which is the next key it must seek to. After receiving the match code SEEK_NEXT_USING_HINT, the QueryMatcher would call this function to find out which key it must next seek to. Concrete implementers can signal a failure condition in their code by throwing an IOException. NOTICE: Filter will be evaluate at server side so the returned Cell must be an ExtendedCell, although it is marked as IA.Private.

Overrides:

getNextCellHint in class FilterBase

Returns:

KeyValue which must be next seeked. return null if the filter is not sure which key to seek to next.

createTreeSet

public TreeSet<byte[]> createTreeSet()

toString

public String toString()

Description copied from class: FilterBase

Return filter's info for debugging and logging purpose.

Overrides:

toString in class FilterBase

toString

protected String toString(int maxPrefixes)

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object