Class AbstractMultiResolutionImage

java.lang.Object

java.awt.Image

java.awt.image.AbstractMultiResolutionImage

All Implemented Interfaces:

MultiResolutionImage

Direct Known Subclasses:

BaseMultiResolutionImage

public abstract class AbstractMultiResolutionImage
extends Image
implements MultiResolutionImage

This class provides default implementations of several Image methods for classes that want to implement the MultiResolutionImage interface. For example,

public class CustomMultiResolutionImage extends AbstractMultiResolutionImage {

    final Image[] resolutionVariants;

    public CustomMultiResolutionImage(Image... resolutionVariants) {
         this.resolutionVariants = resolutionVariants;
    }

    public Image getResolutionVariant(
            double destImageWidth, double destImageHeight) {
        // return a resolution variant based on the given destination image size
    }

    public List<Image> getResolutionVariants() {
        return Collections.unmodifiableList(Arrays.asList(resolutionVariants));
    }

    protected Image getBaseImage() {
        return resolutionVariants[0];
    }
}
 

Since:

9

See Also:

• Image
• MultiResolutionImage

Field Summary

Fields declared in class Image

accelerationPriority, SCALE_AREA_AVERAGING, SCALE_DEFAULT, SCALE_FAST, SCALE_REPLICATE, SCALE_SMOOTH, UndefinedProperty

Modifier and Type	Field	Description
protected float	accelerationPriority	Priority for accelerating this image.
static final int	SCALE_AREA_AVERAGING	Use the Area Averaging image scaling algorithm.
static final int	SCALE_DEFAULT	Use the default image-scaling algorithm.
static final int	SCALE_FAST	Choose an image-scaling algorithm that gives higher priority to scaling speed than smoothness of the scaled image.
static final int	SCALE_REPLICATE	Use the image scaling algorithm embodied in the ReplicateScaleFilter class.
static final int	SCALE_SMOOTH	Choose an image-scaling algorithm that gives higher priority to image smoothness than scaling speed.
static final Object	UndefinedProperty	The UndefinedProperty object should be returned whenever a property which was not defined for a particular image is fetched.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractMultiResolutionImage()	Constructor for subclasses to call.

Method Summary

Modifier and Type	Method	Description
protected abstract Image	getBaseImage()	Return the base image representing the best version of the image for rendering at the default width and height.
Graphics	getGraphics()	As per the contract of the base Image#getGraphics() method, this implementation will always throw UnsupportedOperationException since only off-screen images can return a Graphics object.
int	getHeight(ImageObserver observer)	This method simply delegates to the same method on the base image and it is equivalent to: getBaseImage().getHeight(observer).
Object	getProperty(String name, ImageObserver observer)	This method simply delegates to the same method on the base image and it is equivalent to: getBaseImage().getProperty(name, observer).
ImageProducer	getSource()	This method simply delegates to the same method on the base image and it is equivalent to: getBaseImage().getSource().
int	getWidth(ImageObserver observer)	This method simply delegates to the same method on the base image and it is equivalent to: getBaseImage().getWidth(observer).

Methods declared in class Image

flush, getAccelerationPriority, getCapabilities, getScaledInstance, setAccelerationPriority

Modifier and Type	Method	Description
void	flush()	Flushes all reconstructable resources being used by this Image object.
float	getAccelerationPriority()	Returns the current value of the acceleration priority hint.
ImageCapabilities	getCapabilities(GraphicsConfiguration gc)	Returns an ImageCapabilities object which can be inquired as to the capabilities of this Image on the specified GraphicsConfiguration.
Image	getScaledInstance(int width, int height, int hints)	Creates a scaled version of this image.
void	setAccelerationPriority(float priority)	Sets a hint for this image about how important acceleration is.

Methods declared in class Object

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

Modifier and Type	Method	Description
protected Object	clone()	Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
boolean	equals(Object o)	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. May cause performance issues, deadlocks and hangs.
final Class<? extends Object>	getClass()	Answers the unique instance of java.lang.Class which represents the class of the receiver.
int	hashCode()	Answers an integer hash code for the receiver.
final void	notify()	Causes one thread which is waiting on the receiver to be made ready to run.
final void	notifyAll()	Causes all threads which are waiting on the receiver to be made ready to run.
String	toString()	Answers a string containing a concise, human-readable description of the receiver.
final void	wait()	Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
final void	wait(long time)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
final void	wait(long time, int frac)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

Methods declared in interface MultiResolutionImage

getResolutionVariant, getResolutionVariants

Modifier and Type	Method	Description
Image	getResolutionVariant(double destImageWidth, double destImageHeight)	Gets a specific image that is the best variant to represent this logical image at the indicated size.
List<Image>	getResolutionVariants()	Gets a readable list of all resolution variants.

Constructor Details

AbstractMultiResolutionImage

protected AbstractMultiResolutionImage()

Constructor for subclasses to call.

Method Details

getWidth

public int getWidth(ImageObserver observer)

This method simply delegates to the same method on the base image and it is equivalent to: getBaseImage().getWidth(observer).

Specified by:

getWidth in class Image

Parameters:

observer - an object waiting for the image to be loaded.

Returns:

the width of the base image, or -1 if the width is not yet known

Since:

9

See Also:

• getBaseImage()

getHeight

public int getHeight(ImageObserver observer)

This method simply delegates to the same method on the base image and it is equivalent to: getBaseImage().getHeight(observer).

Specified by:

getHeight in class Image

Parameters:

observer - an object waiting for the image to be loaded.

Returns:

the height of the base image, or -1 if the height is not yet known

Since:

9

See Also:

• getBaseImage()

getSource

public ImageProducer getSource()

This method simply delegates to the same method on the base image and it is equivalent to: getBaseImage().getSource().

Specified by:

getSource in class Image

Returns:

the image producer that produces the pixels for the base image

Since:

9

See Also:

• getBaseImage()

getGraphics

public Graphics getGraphics()

As per the contract of the base Image#getGraphics() method, this implementation will always throw UnsupportedOperationException since only off-screen images can return a Graphics object.

Specified by:

getGraphics in class Image

Returns:

throws UnsupportedOperationException

Throws:

UnsupportedOperationException - this method is not supported

See Also:

• Graphics
• Component.createImage(int, int)

getProperty

public Object getProperty(String name,
 ImageObserver observer)

This method simply delegates to the same method on the base image and it is equivalent to: getBaseImage().getProperty(name, observer).

Specified by:

getProperty in class Image

Parameters:

name - a property name.

observer - an object waiting for this image to be loaded.

Returns:

the value of the named property in the base image

Since:

9

See Also:

• getBaseImage()

getBaseImage

protected abstract Image getBaseImage()

Return the base image representing the best version of the image for rendering at the default width and height.

Returns:

the base image of the set of multi-resolution images

Since:

9