DescendingRangeIterator (Yamcs :: Core 5.2.3 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 strictStart=true then the first rangeStart.length bytes of the key are compared with the rangeStart, if they are equal the record is skipped. same is valid for strictEnd So 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 skip records 1,2 and 3 and start from record 4

Constructor Summary

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

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,
                               boolean strictStart,
                               byte[] rangeEnd,
                               boolean strictEnd)
```
    Creates a new range iterator that iteates in descending order from rangeEnd to rangeStart
    
    Parameters:
    
    it -
    
    rangeStart -
    
    strictStart -
    
    rangeEnd -
    
    strictEnd -
- 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