us.zuercher.gpx2map.image
Class CompositeImageFactory

java.lang.Object
  us.zuercher.gpx2map.image.CompositeImageFactory

All Implemented Interfaces:

ImageFactory

public class CompositeImageFactory
extends Object
implements ImageFactory

CompositeImageFactory delegates image creation to the NetpbmImageFactory and GenericImageFactory classes.

Author:

Stephan Zuercher

Field Summary

private static List<ImageFormatDescriptor>	formatDescriptors List of ImageFormatDescriptor objects for our supported formats.
static CompositeImageFactory	instance The singleton instance of this image factory.
private static List<ImageFactory>	subordinates List of ImageFactory implmentations that compose this image factory.

Constructor Summary

private

CompositeImageFactory() CompositeImageFactory is a singleton.

Method Summary

boolean	canLoad(File imageFile) Tests whether the given file can be loaded.
boolean	canLoad(URL imageUrl) Tests whether the given URL refers to an image that can be loaded.
List<ImageFormatDescriptor>	getSupportedImageFormats() Returns the ImageFormatDescriptors for image formats supported by this factory.
Image	loadImage(File imageFile) Loads the given image file.
Image	loadImage(URL imageUrl) Loads the given image.

Methods inherited from class java.lang.Object

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

Field Detail

instance

public static final CompositeImageFactory instance

The singleton instance of this image factory.

subordinates

private static final List<ImageFactory> subordinates

List of ImageFactory implmentations that compose this image factory.

formatDescriptors

private static final List<ImageFormatDescriptor> formatDescriptors

List of ImageFormatDescriptor objects for our supported formats.

Constructor Detail

CompositeImageFactory

private CompositeImageFactory()

CompositeImageFactory is a singleton.

See Also:

instance

Method Detail

getSupportedImageFormats

public List<ImageFormatDescriptor> getSupportedImageFormats()

Returns the ImageFormatDescriptors for image formats supported by this factory.

Specified by:

getSupportedImageFormats in interface ImageFactory

Returns:

the ImageFormatDescriptors for image formats supported by this factory.

canLoad

public boolean canLoad(File imageFile)
                throws IOException

Tests whether the given file can be loaded.

Specified by:

canLoad in interface ImageFactory

Parameters:

imageFile - the file to test

Returns:

true if the file is an image in a supported format

Throws:

IOException - if there's an error reading the file

canLoad

public boolean canLoad(URL imageUrl)
                throws IOException

Tests whether the given URL refers to an image that can be loaded.

Specified by:

canLoad in interface ImageFactory

Parameters:

imageUrl - the URL to test

Returns:

true if the URL refers to an image in a supported format

Throws:

IOException - if there's an error reading the URL

loadImage

public Image loadImage(File imageFile)
                throws IOException,
                       UnknownFormatException

Loads the given image file.

Specified by:

loadImage in interface ImageFactory

Parameters:

imageFile - an image file

Returns:

an Image

Throws:

IOException - if there's an error reading the file

UnknownFormatException - if the file's format is not known

loadImage

public Image loadImage(URL imageUrl)
                throws IOException,
                       UnknownFormatException

Loads the given image.

Specified by:

loadImage in interface ImageFactory

Parameters:

imageUrl - an image URL

Returns:

an Image

Throws:

IOException - if there's an error reading the file

UnknownFormatException - if the file's format is not known