org.cdlib.xtf.saxonExt.image
Class ImageCache

Object
  Cache<K,V>
      GeneratingCache<String,BufferedImage>
          ImageCache

 class ImageCache
extends GeneratingCache<String,BufferedImage>

Maintain a cache of palette-mapped images used for image highlighting.

Author:

Martin Haye

Nested Class Summary

Nested classes/interfaces inherited from class Cache

Cache.ListEntry, Cache.NullIterator

Field Summary

private int

outColorBase

Fields inherited from class Cache

ageList, keyMap

Constructor Summary

ImageCache(int outColorBase)
Construct the cache

Method Summary

protected BufferedImage	generate(String filename) Read in and map an image
private BufferedImage	remapPalette(BufferedImage inImg) Remap the colors in the given image, creating space for highlight versions of the colors.

Methods inherited from class GeneratingCache

addDependency, find

Methods inherited from class Cache

cleanup, clear, dependenciesValid, getDependencies, has, lastSet, logAction, remove, size

Methods inherited from class Object

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

Field Detail

outColorBase

private int outColorBase

Constructor Detail

ImageCache

ImageCache(int outColorBase)

Construct the cache

Method Detail

generate

protected BufferedImage generate(String filename)
                          throws Exception

Read in and map an image

Specified by:

generate in class GeneratingCache<String,BufferedImage>

Parameters:

filename - The key to generate a value for.

Returns:

The value for that key

Throws:

Exception - If a value cannot be generated for any reason.

remapPalette

private BufferedImage remapPalette(BufferedImage inImg)
                            throws DynamicError

Remap the colors in the given image, creating space for highlight versions of the colors.

Parameters:

inImg - The image to remap

Returns:

A new image with reduced and normalized palette

Throws:

DynamicError