Package org.apache.xmlgraphics.image.loader.impl

Class AbstractImagePreloader

java.lang.Object

org.apache.xmlgraphics.image.loader.impl.AbstractImagePreloader

All Implemented Interfaces:

ImagePreloader

Direct Known Subclasses:

PreloaderBMP, PreloaderEMF, PreloaderEPS, PreloaderGIF, PreloaderImageIO, PreloaderJPEG, PreloaderRawPNG, PreloaderTIFF

public abstract class AbstractImagePreloader
extends Object
implements ImagePreloader

Abstract base class for image preloaders. It provides helper methods for often-used tasks.

Field Summary

Fields inherited from interface org.apache.xmlgraphics.image.loader.spi.ImagePreloader

DEFAULT_PRIORITY

Constructor Summary

Constructors

Constructor	Description
AbstractImagePreloader()

Method Summary

Modifier and Type	Method	Description
protected byte[]	getHeader(ImageInputStream in, int size)	Allows to read an image header (usually just a magic number).
int	getPriority()	Returns the priority of the preloader.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.xmlgraphics.image.loader.spi.ImagePreloader

preloadImage

Constructor Detail

AbstractImagePreloader

public AbstractImagePreloader()

Method Detail

getHeader

protected byte[] getHeader(ImageInputStream in,
                           int size)
                    throws IOException

Allows to read an image header (usually just a magic number). The InputStream is reset to the position before the header was read.

Parameters:

in - the ImageInputStream to read from

size - the size of the header

Returns:

the loaded header

Throws:

IOException - if an I/O error occurs while reading the header

getPriority

public int getPriority()

Returns the priority of the preloader. The lower the value, the higher the preloader's priority.

Specified by:

getPriority in interface ImagePreloader

Returns:

an integer (default is 1000)