DescendingRangeIterator (Yamcs :: Core 5.3.2 API)

java.lang.Object
- org.yamcs.yarch.rocksdb.DescendingRangeIterator

All Implemented Interfaces:

AutoCloseable, DbIterator
```
public class DescendingRangeIterator
extends Object
implements DbIterator
```
Wrapper around a rocksdb iterator that only supports prev() and is restricted to a range.
If the rangeStart or rangeEnd are specified, any key which starts or it's equal with them is considered as matching.
That means they will all be returned when strictStart/End=false or they will all be skipped if strictStart/End=true.
For example, with the following DB:
```
  1: 0x00 0x00 0x00 0x02
  2: 0x01 0x01 0x01 0x00
  3: 0x01 0x01 0x01 0x03
  4: 0x01 0x01 0x02 0x00
 
```
and rangeStart = 0x01 0x01 0x01, strictStart=true
the iterator will only return record 4
with rangeEnd = 0x01, strictEnd = false, the iterator will return all records in descending order 4,3,2,1.

Constructor Summary

Constructors
Constructor	Description
`DescendingRangeIterator(org.rocksdb.RocksIterator it, byte[] rangeStart, byte[] rangeEnd)`	Creates a new range iterator that iteates in descending order from rangeEnd to rangeStart
`DescendingRangeIterator(org.rocksdb.RocksIterator it, DbRange range)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`
`boolean`	`isValid()`
`byte[]`	`key()`
`void`	`next()`
`void`	`prev()`
`byte[]`	`value()`

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

- Constructor Detail
  - DescendingRangeIterator
```
public DescendingRangeIterator(org.rocksdb.RocksIterator it,
                               byte[] rangeStart,
                               byte[] rangeEnd)
```
    Creates a new range iterator that iteates in descending order from rangeEnd to rangeStart
    
    Parameters:
    
    it -
    
    rangeStart -
    
    rangeEnd -
  - DescendingRangeIterator
```
public DescendingRangeIterator(org.rocksdb.RocksIterator it,
                               DbRange range)
```
- Method Detail
  - isValid
```
public boolean isValid()
```
    Specified by:
    
    isValid in interface DbIterator
  - prev
```
public void prev()
```
    Specified by:
    
    prev in interface DbIterator
  - next
```
public void next()
```
    Specified by:
    
    next in interface DbIterator
  - key
```
public byte[] key()
```
    Specified by:
    
    key in interface DbIterator
  - value
```
public byte[] value()
```
    Specified by:
    
    value in interface DbIterator
  - close
```
public void close()
```
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in interface DbIterator