org.apache.hadoop.hbase
Class KeyValue.KVComparator

java.lang.Object
  org.apache.hadoop.hbase.KeyValue.KVComparator

All Implemented Interfaces:

Comparator<KeyValue>

Direct Known Subclasses:

KeyValue.MetaComparator

Enclosing class:

KeyValue

public static class KeyValue.KVComparator
extends Object
implements Comparator<KeyValue>

Compare KeyValues. When we compare KeyValues, we only compare the Key portion. This means two KeyValues with same Key but different Values are considered the same as far as this Comparator is concerned. Hosts a KeyValue.RootKeyComparator.

Constructor Summary

KeyValue.KVComparator()

Method Summary

protected Object	clone()
int	compare(KeyValue left, KeyValue right)
int	compareColumns(KeyValue left, byte[] right, int roffset, int rlength, int rfamilyoffset)
int	compareRows(byte[] left, int loffset, int llength, byte[] right, int roffset, int rlength)
int	compareRows(KeyValue left, byte[] row)
int	compareRows(KeyValue left, KeyValue right)
int	compareRows(KeyValue left, short lrowlength, KeyValue right, short rrowlength)
int	compareTimestamps(KeyValue left, KeyValue right)
KeyValue.KVComparator	getComparatorIgnoringTimestamps()
KeyValue.KVComparator	getComparatorIgnoringType()
KeyValue.KeyComparator	getRawComparator()
boolean	matchingRowColumn(KeyValue left, KeyValue right) Compares the row and column of two keyvalues for equality
boolean	matchingRows(byte[] left, int loffset, int llength, byte[] right, int roffset, int rlength)
boolean	matchingRows(KeyValue left, byte[] right)
boolean	matchingRows(KeyValue left, KeyValue right) Compares the row of two keyvalues for equality
boolean	matchingRows(KeyValue left, short lrowlength, KeyValue right, short rrowlength)
boolean	matchingRowsGreaterTimestamp(KeyValue left, KeyValue right) Compares the row and timestamp of two keys Was called matchesWithoutColumn in HStoreKey.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

equals

Constructor Detail

KeyValue.KVComparator

public KeyValue.KVComparator()

Method Detail

getRawComparator

public KeyValue.KeyComparator getRawComparator()

Returns:

RawComparator that can compare the Key portion of a KeyValue. Used in hfile where indices are the Key portion of a KeyValue.

compare

public int compare(KeyValue left,
                   KeyValue right)

Specified by:

compare in interface Comparator<KeyValue>

compareTimestamps

public int compareTimestamps(KeyValue left,
                             KeyValue right)

compareRows

public int compareRows(KeyValue left,
                       KeyValue right)

Parameters:

left -

right -

Returns:

Result comparing rows.

compareRows

public int compareRows(KeyValue left,
                       short lrowlength,
                       KeyValue right,
                       short rrowlength)

Parameters:

left -

lrowlength - Length of left row.

right -

rrowlength - Length of right row.

Returns:

Result comparing rows.

compareRows

public int compareRows(KeyValue left,
                       byte[] row)

Parameters:

left -

row - - row key (arbitrary byte array)

Returns:

RawComparator

compareRows

public int compareRows(byte[] left,
                       int loffset,
                       int llength,
                       byte[] right,
                       int roffset,
                       int rlength)

compareColumns

public int compareColumns(KeyValue left,
                          byte[] right,
                          int roffset,
                          int rlength,
                          int rfamilyoffset)

matchingRowColumn

public boolean matchingRowColumn(KeyValue left,
                                 KeyValue right)

Compares the row and column of two keyvalues for equality

Parameters:

left -

right -

Returns:

True if same row and column.

matchingRows

public boolean matchingRows(KeyValue left,
                            byte[] right)

Parameters:

left -

right -

Returns:

True if rows match.

matchingRows

public boolean matchingRows(KeyValue left,
                            KeyValue right)

Compares the row of two keyvalues for equality

Parameters:

left -

right -

Returns:

True if rows match.

matchingRows

public boolean matchingRows(KeyValue left,
                            short lrowlength,
                            KeyValue right,
                            short rrowlength)

Parameters:

left -

lrowlength -

right -

rrowlength -

Returns:

True if rows match.

matchingRows

public boolean matchingRows(byte[] left,
                            int loffset,
                            int llength,
                            byte[] right,
                            int roffset,
                            int rlength)

matchingRowsGreaterTimestamp

public boolean matchingRowsGreaterTimestamp(KeyValue left,
                                            KeyValue right)

Compares the row and timestamp of two keys Was called matchesWithoutColumn in HStoreKey.

Parameters:

right - Key to compare against.

Returns:

True if same row and timestamp is greater than the timestamp in right

clone

protected Object clone()
                throws CloneNotSupportedException

Overrides:

clone in class Object

Throws:

CloneNotSupportedException

getComparatorIgnoringTimestamps

public KeyValue.KVComparator getComparatorIgnoringTimestamps()

Returns:

Comparator that ignores timestamps; useful counting versions.

getComparatorIgnoringType

public KeyValue.KVComparator getComparatorIgnoringType()

Returns:

Comparator that ignores key type; useful checking deletes