GetClosestRowBeforeTracker (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.regionserver.GetClosestRowBeforeTracker

```
@InterfaceAudience.Private
 class GetClosestRowBeforeTracker
extends Object
```
State and utility processing HRegion.getClosestRowBefore(byte[], byte[]). Like ScanQueryMatcher and ScanDeleteTracker but does not implement the DeleteTracker interface since state spans rows (There is no update nor reset method).

Field Summary

Fields
Modifier and Type	Field and Description
`private Cell`	`candidate`
`private NavigableMap<KeyValue,NavigableSet<KeyValue>>`	`deletes`
`private KeyValue.KVComparator`	`kvcomparator`
`private boolean`	`metaregion`
`private long`	`now`
`private long`	`oldestUnexpiredTs`
`private int`	`rowoffset`
`private int`	`tablenamePlusDelimiterLength`
`private KeyValue`	`targetkey`

Constructor Summary

Constructors
Constructor and Description
`GetClosestRowBeforeTracker(KeyValue.KVComparator c, KeyValue kv, long ttl, boolean metaregion)`

Method Summary

Methods
Modifier and Type	Method and Description
`private boolean`	`addCandidate(Cell kv)`
`private void`	`addDelete(Cell kv)`
`Cell`	`getCandidate()`
`KeyValue`	`getTargetKey()`
`(package private) boolean`	`handle(Cell kv)` Do right thing with passed key, add to deletes or add to candidates.
`(package private) boolean`	`handleDeletes(Cell kv)`
`boolean`	`hasCandidate()`
`(package private) boolean`	`isBetterCandidate(Cell contender)`
`private boolean`	`isDeleted(Cell kv)`
`boolean`	`isDeleted(Cell kv, NavigableSet<KeyValue> ds)` Check if the specified KeyValue buffer has been deleted by a previously seen delete.
`boolean`	`isExpired(Cell cell)`
`(package private) boolean`	`isTargetTable(Cell kv)`
`(package private) boolean`	`isTooFar(Cell kv, Cell firstOnRow)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

targetkey
```
private final KeyValue targetkey
```

now
```
private final long now
```

oldestUnexpiredTs
```
private final long oldestUnexpiredTs
```

candidate
```
private Cell candidate
```

kvcomparator

private final KeyValue.KVComparator kvcomparator

metaregion
```
private final boolean metaregion
```

rowoffset
```
private final int rowoffset
```

tablenamePlusDelimiterLength

private final int tablenamePlusDelimiterLength

deletes

private final NavigableMap<KeyValue,NavigableSet<KeyValue>> deletes

Constructor Detail
- GetClosestRowBeforeTracker
```
GetClosestRowBeforeTracker(KeyValue.KVComparator c,
                          KeyValue kv,
                          long ttl,
                          boolean metaregion)
```
  Parameters:
  c -
  kv - Presume first on row: i.e. empty column, maximum timestamp and a type of Type.Maximum
  ttl - Time to live in ms for this Store
  metaregion - True if this is hbase:meta or -ROOT- region.

Method Detail
- addDelete
```
private void addDelete(Cell kv)
```
- addCandidate
```
private boolean addCandidate(Cell kv)
```
- isBetterCandidate
```
boolean isBetterCandidate(Cell contender)
```
- isDeleted
```
private boolean isDeleted(Cell kv)
```
- isDeleted
```
public boolean isDeleted(Cell kv,
                NavigableSet<KeyValue> ds)
```
  Check if the specified KeyValue buffer has been deleted by a previously seen delete.
  
  Parameters:
  kv -
  ds -
  
  Returns:
  True is the specified KeyValue is deleted, false if not
- isExpired
```
public boolean isExpired(Cell cell)
```
  Parameters:
  cell -
  
  Returns:
  true if the cell is expired
- handleDeletes
```
boolean handleDeletes(Cell kv)
```
- handle
```
boolean handle(Cell kv)
```
  Do right thing with passed key, add to deletes or add to candidates.
  
  Parameters:
  kv -
  
  Returns:
  True if we added a candidate
- hasCandidate
```
public boolean hasCandidate()
```
  Returns:
  True if has candidate
- getCandidate
```
public Cell getCandidate()
```
  Returns:
  Best candidate or null.
- getTargetKey
```
public KeyValue getTargetKey()
```
- isTooFar
```
boolean isTooFar(Cell kv,
               Cell firstOnRow)
```
  Parameters:
  kv - Current kv
  firstOnRow - on row kv.
  
  Returns:
  True if we went too far, past the target key.
- isTargetTable
```
boolean isTargetTable(Cell kv)
```

Class GetClosestRowBeforeTracker

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

targetkey

now

oldestUnexpiredTs

candidate

kvcomparator

metaregion

rowoffset

tablenamePlusDelimiterLength

deletes

Constructor Detail

GetClosestRowBeforeTracker

Method Detail

addDelete

addCandidate

isBetterCandidate

isDeleted

isDeleted

isExpired

handleDeletes

handle

hasCandidate

getCandidate

getTargetKey

isTooFar

isTargetTable