org.dspace.app.mediafilter

Class JPEGFilter

java.lang.Object

org.dspace.app.mediafilter.MediaFilter

org.dspace.app.mediafilter.JPEGFilter

All Implemented Interfaces:

FormatFilter, SelfRegisterInputFormats

public class JPEGFilter
extends MediaFilter
implements SelfRegisterInputFormats

Filter image bitstreams, scaling the image to be within the bounds of thumbnail.maxwidth, thumbnail.maxheight, the size we want our thumbnail to be no bigger than. Creates only JPEGs.

Author:

Jason Sherman

Constructor Summary

Constructors

Constructor and Description
JPEGFilter()

Method Summary

Methods

Modifier and Type	Method and Description
BufferedImage	getBlurredInstance(BufferedImage buf)
String	getBundleName()
String	getDescription()
InputStream	getDestinationStream(InputStream source)
String	getFilteredName(String oldFilename) Get a filename for a newly created filtered bitstream
String	getFormatString()
String[]	getInputDescriptions()
String[]	getInputExtensions()
String[]	getInputMIMETypes()
BufferedImage	getNormalizedInstance(BufferedImage buf)
BufferedImage	getScaledInstance(BufferedImage buf, int targetWidth, int targetHeight, Object hint, boolean higherQuality) Convenience method that returns a scaled instance of the provided BufferedImage.

Methods inherited from class org.dspace.app.mediafilter.MediaFilter

postProcessBitstream, preProcessBitstream

Methods inherited from class java.lang.Object

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

Constructor Detail

JPEGFilter

public JPEGFilter()

Method Detail

getFilteredName

public String getFilteredName(String oldFilename)

Description copied from interface: FormatFilter

Get a filename for a newly created filtered bitstream

Specified by:

getFilteredName in interface FormatFilter

Parameters:

oldFilename - name of source bitstream

Returns:

filename generated by the filter - for example, document.pdf becomes document.pdf.txt

getBundleName

public String getBundleName()

Specified by:

getBundleName in interface FormatFilter

Returns:

String bundle name

getFormatString

public String getFormatString()

Specified by:

getFormatString in interface FormatFilter

Returns:

String bitstreamformat

getDescription

public String getDescription()

Specified by:

getDescription in interface FormatFilter

Returns:

String description

getDestinationStream

public InputStream getDestinationStream(InputStream source)
                                 throws Exception

Specified by:

getDestinationStream in interface FormatFilter

Parameters:

source - source input stream

Returns:

InputStream the resulting input stream

Throws:

Exception

getInputMIMETypes

public String[] getInputMIMETypes()

Specified by:

getInputMIMETypes in interface SelfRegisterInputFormats

getInputDescriptions

public String[] getInputDescriptions()

Specified by:

getInputDescriptions in interface SelfRegisterInputFormats

getInputExtensions

public String[] getInputExtensions()

Specified by:

getInputExtensions in interface SelfRegisterInputFormats

getNormalizedInstance

public BufferedImage getNormalizedInstance(BufferedImage buf)

getBlurredInstance

public BufferedImage getBlurredInstance(BufferedImage buf)

getScaledInstance

public BufferedImage getScaledInstance(BufferedImage buf,
                              int targetWidth,
                              int targetHeight,
                              Object hint,
                              boolean higherQuality)

Convenience method that returns a scaled instance of the provided BufferedImage.

Parameters:

buf - the original image to be scaled

targetWidth - the desired width of the scaled instance, in pixels

targetHeight - the desired height of the scaled instance, in pixels

hint - one of the rendering hints that corresponds to RenderingHints.KEY_INTERPOLATION (e.g. RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR, RenderingHints.VALUE_INTERPOLATION_BILINEAR, RenderingHints.VALUE_INTERPOLATION_BICUBIC)

higherQuality - if true, this method will use a multi-step scaling technique that provides higher quality than the usual one-step technique (only useful in downscaling cases, where targetWidth or targetHeight is smaller than the original dimensions, and generally only when the BILINEAR hint is specified)

Returns:

a scaled version of the original BufferedImage