demo.webcab.chat.gui
Class ImageCache

java.lang.Object
  |
  +--java.awt.Image
        |
        +--demo.webcab.chat.gui.ImageCache

All Implemented Interfaces:

java.awt.image.ImageConsumer

public class ImageCache

extends java.awt.Image

implements java.awt.image.ImageConsumer

This class encapsulates all data a java.awt.Image holds, by caching it into memory. It is an alternative to the way Images created with java.awt.Toolkit.getImage are drawn.

When an image is created with awt's methods, the bytes loaded from the specified image URL might suffer from low band width. ImageCache has a very stable loading method, which ensures no data losses occur. This prevents errors like missing chunks or mismatched colors.

Author:

WebCab Components

Field Summary

static int	ANIMATED The image is an animated gif.
static int	DUNNO The state of the image is unknown
static int	SINGLE The image is a static one (no frames).

Fields inherited from class java.awt.Image

SCALE_AREA_AVERAGING, SCALE_DEFAULT, SCALE_FAST, SCALE_REPLICATE, SCALE_SMOOTH, UndefinedProperty

Fields inherited from interface java.awt.image.ImageConsumer

COMPLETESCANLINES, IMAGEABORTED, IMAGEERROR, RANDOMPIXELORDER, SINGLEFRAME, SINGLEFRAMEDONE, SINGLEPASS, STATICIMAGEDONE, TOPDOWNLEFTRIGHT

Constructor Summary

ImageCache(java.lang.String s, java.awt.Component component)
This constructor loads the image data into memory.

Method Summary

void	flush()
java.awt.Graphics	getGraphics()
int	getHeight(java.awt.image.ImageObserver o)
java.awt.Image	getImage()
java.lang.Object	getProperty(java.lang.String name, java.awt.image.ImageObserver observer)
java.awt.Image	getScaledInstance(int w, int h, int hints)
java.awt.image.ImageProducer	getSource()
int	getType() Returns any of the three available known, out of which you can test whether the image is an animated frame-by-frame or is static.
int	getWidth(java.awt.image.ImageObserver o)
void	imageComplete(int status)
static java.awt.Image	readImage(java.lang.String imageFile, java.awt.Component component) A static method provided by this class as a convenience.
static java.awt.Image	readImage(java.net.URL imageURL, java.awt.Component component) A static method provided by this class as a convenience.
void	setColorModel(java.awt.image.ColorModel model)
void	setDimensions(int w, int h)
void	setHints(int hints)
void	setPixels(int x, int y, int w, int h, java.awt.image.ColorModel c, byte[] pixels, int off, int scansize)
void	setPixels(int x, int y, int w, int h, java.awt.image.ColorModel c, int[] pixels, int off, int scansize)
void	setProperties(java.util.Hashtable h)

Methods inherited from class java.lang.Object

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

Field Detail

DUNNO

public static final int DUNNO

The state of the image is unknown

SINGLE

public static final int SINGLE

The image is a static one (no frames).

ANIMATED

public static final int ANIMATED

The image is an animated gif.

Constructor Detail

ImageCache

public ImageCache(java.lang.String s,
                  java.awt.Component component)

This constructor loads the image data into memory.

Parameters:

imageURL - The URL base where the image is located

comp - The component to render with

See Also:

readImage(URL, Component)

Method Detail

readImage

public static java.awt.Image readImage(java.lang.String imageFile,
                                       java.awt.Component component)

A static method provided by this class as a convenience. The functionality is similar to that of java.awt.Toolkit.getImage, offering a more secure transfer and less data loss.

Parameters:

imageFile - the name of the URL where the image to be loaded is located

component - the Component which is going to encapsulate the Image (for example a java.awt.Canvas)

Returns:

The image which gets its data from the specified resource, ready to be deployed inside the component.

See Also:

readImage(URL, Component)

readImage

public static java.awt.Image readImage(java.net.URL imageURL,
                                       java.awt.Component component)

A static method provided by this class as a convenience. The functionality is similar to that of java.awt.Toolkit.getImage, offering a more secure transfer and less data loss.

Parameters:

imageURl - the URL base of the image location

imageFile - the name of the image

component - the Component which is going to encapsulate the Image (for example a java.awt.Canvas)

Returns:

The image which gets its data from the specified resource, ready to be deployed inside the component.

See Also:

readImage(URL, Component), readImage(String, Component)

imageComplete

public void imageComplete(int status)

Specified by:

imageComplete in interface java.awt.image.ImageConsumer

setColorModel

public void setColorModel(java.awt.image.ColorModel model)

Specified by:

setColorModel in interface java.awt.image.ImageConsumer

setDimensions

public void setDimensions(int w,
                          int h)

Specified by:

setDimensions in interface java.awt.image.ImageConsumer

setHints

public void setHints(int hints)

Specified by:

setHints in interface java.awt.image.ImageConsumer

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      java.awt.image.ColorModel c,
                      byte[] pixels,
                      int off,
                      int scansize)

Specified by:

setPixels in interface java.awt.image.ImageConsumer

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      java.awt.image.ColorModel c,
                      int[] pixels,
                      int off,
                      int scansize)

Specified by:

setPixels in interface java.awt.image.ImageConsumer

setProperties

public void setProperties(java.util.Hashtable h)

Specified by:

setProperties in interface java.awt.image.ImageConsumer

flush

public void flush()

Overrides:

flush in class java.awt.Image

getGraphics

public java.awt.Graphics getGraphics()

Overrides:

getGraphics in class java.awt.Image

getHeight

public int getHeight(java.awt.image.ImageObserver o)

Overrides:

getHeight in class java.awt.Image

getWidth

public int getWidth(java.awt.image.ImageObserver o)

Overrides:

getWidth in class java.awt.Image

getProperty

public java.lang.Object getProperty(java.lang.String name,
                                    java.awt.image.ImageObserver observer)

Overrides:

getProperty in class java.awt.Image

getScaledInstance

public java.awt.Image getScaledInstance(int w,
                                        int h,
                                        int hints)

Overrides:

getScaledInstance in class java.awt.Image

getSource

public java.awt.image.ImageProducer getSource()

Overrides:

getSource in class java.awt.Image

getImage

public java.awt.Image getImage()

getType

public int getType()

Returns any of the three available known, out of which you can test whether the image is an animated frame-by-frame or is static.

See Also:

ANIMATED, SINGLE