Package io.debezium.relational.history

Class HistoryRecordComparator

java.lang.Object

io.debezium.relational.history.HistoryRecordComparator

public class HistoryRecordComparator
extends Object

Compares HistoryRecord instances to determine which came first.

Since:

0.2

Author:

Randall Hauch

Field Summary

Fields

Modifier and Type	Field	Description
static HistoryRecordComparator	INSTANCE	A comparator instance that requires the records' sources to be the same and considers only those fields that are in both records' positions.

Constructor Summary

Constructors

Constructor	Description
HistoryRecordComparator()

Method Summary

Modifier and Type	Method	Description
boolean	isAtOrBefore(HistoryRecord record1, HistoryRecord record2)	Determine if the first HistoryRecord is at the same or earlier point in time than the second HistoryRecord.
protected boolean	isPositionAtOrBefore(Document position1, Document position2)
protected boolean	isSameSource(Document source1, Document source2)
static HistoryRecordComparator	usingPositions(BiFunction<Document,Document,Boolean> positionComparator)	Create a HistoryRecordComparator that requires identical sources but will use the supplied function to compare positions.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final HistoryRecordComparator INSTANCE

A comparator instance that requires the records' sources to be the same and considers only those fields that are in both records' positions.

Constructor Detail

HistoryRecordComparator

public HistoryRecordComparator()

Method Detail

usingPositions

public static HistoryRecordComparator usingPositions(BiFunction<Document,Document,Boolean> positionComparator)

Create a HistoryRecordComparator that requires identical sources but will use the supplied function to compare positions.

Parameters:

positionComparator - the non-null function that returns true if the first position is at or before the second position or false otherwise

Returns:

the comparator instance; never null

isAtOrBefore

public boolean isAtOrBefore(HistoryRecord record1,
                            HistoryRecord record2)

Determine if the first HistoryRecord is at the same or earlier point in time than the second HistoryRecord.

Parameters:

record1 - the first record; never null

record2 - the second record; never null

Returns:

true if the first record is at the same or earlier point in time than the second record, or false otherwise

isPositionAtOrBefore

protected boolean isPositionAtOrBefore(Document position1,
                                       Document position2)

isSameSource

protected boolean isSameSource(Document source1,
                               Document source2)