com.inet.html.image
Class ImageCache

java.lang.Object
  com.inet.html.image.ImageCache

public class ImageCache
extends java.lang.Object

JWebEngine Image Cache. Caches the images by soft references, generates id's for images without URL.

Constructor Summary

ImageCache()

Method Summary

void	addImage(java.lang.String identifier, java.net.URL base, java.awt.Image content) Adds a certain image to the cache
RemoteImage	getImage(java.lang.String identifier, java.net.URL base, java.awt.image.ImageObserver observer) Loads a certain image or returns it's cached instance
static ImageCache	getStaticInstance() Returns the static cache.
boolean	isCacheReference(java.lang.String identifier) Returns true, if the identifier is a cache ID.
java.lang.String	registerImage(java.awt.Image content) Stores an image content to the cache an generates an ID for this content
boolean	removeKey(java.lang.String identifier, java.net.URL base) Removes a cache entry, if known

Methods inherited from class java.lang.Object

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

Constructor Detail

ImageCache

public ImageCache()

Method Detail

getStaticInstance

public static ImageCache getStaticInstance()

Returns the static cache.

Returns:

the static cache, never null

getImage

public RemoteImage getImage(java.lang.String identifier,
                            java.net.URL base,
                            java.awt.image.ImageObserver observer)

Loads a certain image or returns it's cached instance

Parameters:

identifier - the identifier (may be a cache ID, a relative or absolute URL)

base - the base URL of the current document, required to resolve relative URLs

observer - the observer to notify of the load progress

Returns:

the image wrapper or null in case of an error

addImage

public void addImage(java.lang.String identifier,
                     java.net.URL base,
                     java.awt.Image content)

Adds a certain image to the cache

Parameters:

identifier - the identifier (may be a cache ID, a relative or absolute URL)

base - the base URL of the current document, required to resolve relative URLs

content - the image content to add to the cache

removeKey

public boolean removeKey(java.lang.String identifier,
                         java.net.URL base)

Removes a cache entry, if known

Parameters:

identifier - the identifier or an absolute or relative URL

base - the base URL for relative URL identifiers

Returns:

true, if the cache map was modified

registerImage

public java.lang.String registerImage(java.awt.Image content)

Stores an image content to the cache an generates an ID for this content

Parameters:

content - the content to store

Returns:

the generaded ID for this content

isCacheReference

public boolean isCacheReference(java.lang.String identifier)

Returns true, if the identifier is a cache ID. This does NOT mean that there is an cache entry for this ID.

Parameters:

identifier - the identifier to be checked, may be null

Returns:

true, if it's a cache ID pattern, false otherwise