org.h2.util

类 SmallMap

java.lang.Object

org.h2.util.SmallMap

public class SmallMap
extends Object

A simple hash table with an optimization for the last recently used object.

构造器概要

构造器

构造器和说明
SmallMap(int maxElements) Create a map with the given maximum number of entries.

方法概要

限定符和类型	方法和说明
int	addObject(int id, Object o) Add an object to the map.
void	freeObject(int id) Remove an object from the map.
Object	getObject(int id, boolean ifAvailable) Get an object from the map if it is stored.

从类继承的方法 java.lang.Object

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

构造器详细资料

SmallMap

public SmallMap(int maxElements)

Create a map with the given maximum number of entries.

参数:

maxElements - the maximum number of entries

方法详细资料

addObject

public int addObject(int id,
                     Object o)

Add an object to the map. If the size of the map is larger than twice the maximum size, objects with a low id are removed.

参数:

id - the object id

o - the object

返回:

the id

freeObject

public void freeObject(int id)

Remove an object from the map.

参数:

id - the id of the object to remove

getObject

public Object getObject(int id,
                        boolean ifAvailable)

Get an object from the map if it is stored.

参数:

id - the id of the object

ifAvailable - only return it if available, otherwise return null

返回:

the object or null

抛出:

DbException - if isAvailable is false and the object has not been found