Package com.ibm.icu.impl

Class CacheBase<K,V,D>

java.lang.Object

com.ibm.icu.impl.CacheBase<K,V,D>

Type Parameters:

K - Cache lookup key type

V - Cache instance value type

D - Data type for creating a new instance value

Direct Known Subclasses:

SoftCache

public abstract class CacheBase<K,V,D>
extends Object

Base class for cache implementations. To use, instantiate a subclass of a concrete implementation class, where the subclass implements the createInstance() method, and call get() with the key and the data. The get() call will use the data only if it needs to call createInstance(), otherwise the data is ignored.

Constructor Summary

Constructors

Constructor	Description
CacheBase()

Method Summary

Modifier and Type	Method	Description
protected abstract V	createInstance(K key, D data)	Creates an instance for the key and data.
abstract V	getInstance(K key, D data)	Retrieves an instance from the cache.

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheBase

public CacheBase()

Method Detail

getInstance

public abstract V getInstance(K key,
                              D data)

Retrieves an instance from the cache. Calls createInstance(key, data) if the cache does not already contain an instance with this key. Ignores data if the cache already contains an instance with this key.

Parameters:

key - Cache lookup key for the requested instance

data - Data for createInstance() if the instance is not already cached

Returns:

The requested instance

createInstance

protected abstract V createInstance(K key,
                                    D data)

Creates an instance for the key and data. Must be overridden.

Parameters:

key - Cache lookup key for the requested instance

data - Data for the instance creation

Returns:

The requested instance