org.h2.mvstore

Class Cursor<K,V>

java.lang.Object

org.h2.mvstore.Cursor<K,V>

Type Parameters:

K - the key type

V - the value type

All Implemented Interfaces:

java.util.Iterator<K>

public final class Cursor<K,V>
extends java.lang.Object
implements java.util.Iterator<K>

A cursor to iterate over elements in ascending or descending order.

Constructor Summary

Constructors

Constructor and Description
Cursor(RootReference<K,V> rootReference, K from, K to)
Cursor(RootReference<K,V> rootReference, K from, K to, boolean reverse)

Method Summary

Modifier and Type	Method and Description
K	getKey() Get the last read key if there was one.
V	getValue() Get the last read value if there was one.
boolean	hasNext()
K	next()
void	skip(long n) Skip over that many entries.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Constructor Detail

Cursor

public Cursor(RootReference<K,V> rootReference,
              K from,
              K to)

Cursor

public Cursor(RootReference<K,V> rootReference,
              K from,
              K to,
              boolean reverse)

Parameters:

rootReference - of the tree

from - starting key (inclusive), if null start from the first / last key

to - ending key (inclusive), if null there is no boundary

reverse - true if tree should be iterated in key's descending order

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface java.util.Iterator<K>

next

public K next()

Specified by:

next in interface java.util.Iterator<K>

getKey

public K getKey()

Get the last read key if there was one.

Returns:

the key or null

getValue

public V getValue()

Get the last read value if there was one.

Returns:

the value or null

skip

public void skip(long n)

Skip over that many entries. This method is relatively fast (for this map implementation) even if many entries need to be skipped.

Parameters:

n - the number of entries to skip