程序包 org.meteoinfo.data.mapdata.webmap

类 TileCache

java.lang.Object

org.meteoinfo.data.mapdata.webmap.TileCache

public class TileCache
extends Object

An implementation only class for now. For internal use only.

作者:

joshua.marinacci@sun.com

构造器概要

构造器

构造器	说明
TileCache()

方法概要

限定符和类型	方法	说明
BufferedImage	get(URI uri)	Returns a buffered image for the requested URI from the cache.
void	needMoreMemory()	Request that the cache free up some memory.
void	put(URI uri, byte[] bimg, BufferedImage img)	Put a tile image into the cache.

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

TileCache

public TileCache()

方法详细资料

put

public void put(URI uri,
                byte[] bimg,
                BufferedImage img)

Put a tile image into the cache. This puts both a buffered image and array of bytes that make up the compressed image.

参数:

uri - URI of image that is being stored in the cache

bimg - bytes of the compressed image, ie: the image file that was loaded over the network

img - image to store in the cache

get

public BufferedImage get(URI uri)
                  throws IOException

Returns a buffered image for the requested URI from the cache. This method must return null if the image is not in the cache. If the image is unavailable but it's compressed version *is* available, then the compressed version will be expanded and returned.

参数:

uri - URI of the image previously put in the cache

返回:

the image matching the requested URI, or null if not available

抛出:

IOException

needMoreMemory

public void needMoreMemory()

Request that the cache free up some memory. How this happens or how much memory is freed is up to the TileCache implementation. Subclasses can implement their own strategy. The default strategy is to clear out all buffered images but retain the compressed versions.