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.

Constructor Summary

Constructors

Constructor

Description

SmallMap(int maxElements)

Create a map with the given maximum number of entries.
Method Summary

Modifier and Type

Method

Description

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.

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

Constructor Details
- SmallMap
  
  public SmallMap(int maxElements)
  
  Create a map with the given maximum number of entries.
  
  Parameters:
  
  maxElements - the maximum number of entries
Method Details
- 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.
  
  Parameters:
  
  id - the object id
  
  o - the object
  
  Returns:
  
  the id
- freeObject
  
  public void freeObject(int id)
  
  Remove an object from the map.
  
  Parameters:
  
  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.
  
  Parameters:
  
  id - the id of the object
  
  ifAvailable - only return it if available, otherwise return null
  
  Returns:
  
  the object or null
  
  Throws:
  
  DbException - if isAvailable is false and the object has not been found