SeekingIterator (leveldb 1.2 API)

Type Parameters:

K - type of the key

V - type of the value

All Superinterfaces:

AutoCloseable, Closeable

All Known Subinterfaces:

InternalIterator, SliceIterator

All Known Implementing Classes:

ASeekingIterator, BlockIterator, DbIterator, InternalTableIterator, MemTableIterator, MergingIterator, SnapshotSeekingIterator
```
public interface SeekingIterator<K,V>
extends Closeable
```
Seeking iterator that is very similar to original implementation, with the distinction that all methods return the state (valid/invalid) of the iterator.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`K`	`key()` Return the key for the current entry.
`boolean`	`next()` Moves to the next entry in the source.
`boolean`	`prev()` Moves to the previous entry in the source.
`boolean`	`seek(K key)` Position at the first key in the source that is at or past target.
`boolean`	`seekToFirst()` Position at the first key in the source.
`boolean`	`seekToLast()` Position at the last key in the source.
`boolean`	`valid()` An iterator is either positioned at a key/value pair, or not valid.
`V`	`value()` Return the value for the current entry.

Methods inherited from interface java.io.Closeable
close

- Method Detail
  - valid
```
boolean valid()
```
    An iterator is either positioned at a key/value pair, or not valid.
    
    Returns:
    
    true if the iterator is valid.
  - seekToFirst
```
boolean seekToFirst()
```
    Position at the first key in the source. The iterator is valid() after this call if the source is not empty.
    
    Returns:
    
    true if iterator is valid, same value will be return by valid() after this call
  - seekToLast
```
boolean seekToLast()
```
    Position at the last key in the source. The iterator is valid() after this call if the source is not empty.
    
    Returns:
    
    true if iterator is valid, same value will be return by valid() after this call
  - seek
```
boolean seek(K key)
```
    Position at the first key in the source that is at or past target. The iterator is valid() after this call if the source contains an entry that comes at or past target.
    
    Returns:
    
    true if iterator is valid, same value will be return by valid() after this call
  - next
```
boolean next()
```
    Moves to the next entry in the source. After this call, valid() is true if the iterator was not positioned at the last entry in the source. In the case seek(Object), seekToLast() or seekToLast() where not called first call to this method should position iterator on the first entry.
    
    Returns:
    
    true if iterator is valid, same value will be return by valid() after this call
  - prev
```
boolean prev()
```
    Moves to the previous entry in the source. Return true if the iterator was not positioned at the first entry in source.
    
    Returns:
    
    true if iterator is valid, same value will be return by valid() after this call
  - key
```
K key()
```
    Return the key for the current entry. The underlying storage for the returned slice is valid only until the next modification of the iterator.
    
    Returns:
    
    current position key
    
    Throws:
    
    NoSuchElementException - if iterator is not in valid state
  - value
```
V value()
```
    Return the value for the current entry. The underlying storage for the returned slice is valid only until the next modification of the iterator.
    
    Returns:
    
    current position value
    
    Throws:
    
    NoSuchElementException - if iterator is not in valid state

Interface SeekingIterator<K,V>

Method Summary

Methods inherited from interface java.io.Closeable

Method Detail

valid

seekToFirst

seekToLast

seek

next

prev

key

value