org.dspace.app.mediafilter

Class BrandedPreviewJPEGFilter

java.lang.Object

org.dspace.app.mediafilter.MediaFilter

org.dspace.app.mediafilter.BrandedPreviewJPEGFilter

All Implemented Interfaces:

FormatFilter

public class BrandedPreviewJPEGFilter
extends MediaFilter

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
BrandedPreviewJPEGFilter()

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()
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

BrandedPreviewJPEGFilter

public BrandedPreviewJPEGFilter()

Method Detail

getFilteredName

public String getFilteredName(String oldFilename)

Description copied from interface: FormatFilter

Get a filename for a newly created filtered bitstream

Parameters:

oldFilename - name of source bitstream

Returns:

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

getBundleName

public String getBundleName()

Returns:

String bundle name

getFormatString

public String getFormatString()

Returns:

String bitstreamformat

getDescription

public String getDescription()

Returns:

String description

getDestinationStream

public InputStream getDestinationStream(InputStream source)
                                 throws Exception

Parameters:

source - source input stream

Returns:

InputStream the resulting input stream

Throws:

Exception

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