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 interface org.apache.xmlgraphics.image.loader.spi.ImagePreloader

preloadImage

Methods inherited from class java.lang.Object

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

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)