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Class IIOImage

public class IIOImage
extends Object

A simple container class to aggregate an image, a set of thumbnail (preview) images, and an object representing metadata associated with the image.

The image data may take the form of either a RenderedImage, or a Raster. Reader methods that return an IIOImage will always return a BufferedImage using the RenderedImage reference. Writer methods that accept an IIOImage will always accept a RenderedImage, and may optionally accept a Raster.

Exactly one of getRenderedImage and getRaster will return a non-null value. Subclasses are responsible for ensuring this behavior.

See Also:
ImageReader.readAll(int, ImageReadParam), ImageReader.readAll(java.util.Iterator), ImageWriter.write(javax.imageio.metadata.IIOMetadata, IIOImage, ImageWriteParam), ImageWriter.write(IIOImage), ImageWriter.writeToSequence(IIOImage, ImageWriteParam), ImageWriter.writeInsert(int, IIOImage, ImageWriteParam)

Fields

image

protected RenderedImage image

The RenderedImage being referenced.

raster

protected Raster raster

The Raster being referenced.

thumbnails

protected List<? extends BufferedImage> thumbnails

A List of BufferedImage thumbnails, or null. Non-BufferedImage objects must not be stored in this List.

metadata

protected IIOMetadata metadata

An IIOMetadata object containing metadata associated with the image.

Constructors

IIOImage

public IIOImage(RenderedImage image,
                List<? extends BufferedImage> thumbnails,
                IIOMetadata metadata)

Constructs an IIOImage containing a RenderedImage, and thumbnails and metadata associated with it.

All parameters are stored by reference.

The thumbnails argument must either be null or contain only BufferedImage objects.

Parameters:
image - a RenderedImage.
thumbnails - a List of BufferedImages, or null.
metadata - an IIOMetadata object, or null.
Throws:
IllegalArgumentException - if image is null.

IIOImage

public IIOImage(Raster raster,
                List<? extends BufferedImage> thumbnails,
                IIOMetadata metadata)

Constructs an IIOImage containing a Raster, and thumbnails and metadata associated with it.

All parameters are stored by reference.

Parameters:
raster - a Raster.
thumbnails - a List of BufferedImages, or null.
metadata - an IIOMetadata object, or null.
Throws:
IllegalArgumentException - if raster is null.

Methods

getRenderedImage

public RenderedImage getRenderedImage()

Returns the currently set RenderedImage, or null if only a Raster is available.

Returns:
a RenderedImage, or null.
See Also:
setRenderedImage(java.awt.image.RenderedImage)

setRenderedImage

public void setRenderedImage(RenderedImage image)

Sets the current RenderedImage. The value is stored by reference. Any existing Raster is discarded.

Parameters:
image - a RenderedImage.
Throws:
IllegalArgumentException - if image is null.
See Also:
getRenderedImage()

hasRaster

public boolean hasRaster()

Returns true if this IIOImage stores a Raster rather than a RenderedImage.

Returns:
true if a Raster is available.

getRaster

public Raster getRaster()

Returns the currently set Raster, or null if only a RenderedImage is available.

Returns:
a Raster, or null.
See Also:
setRaster(java.awt.image.Raster)

setRaster

public void setRaster(Raster raster)

Sets the current Raster. The value is stored by reference. Any existing RenderedImage is discarded.

Parameters:
raster - a Raster.
Throws:
IllegalArgumentException - if raster is null.
See Also:
getRaster()

getNumThumbnails

public int getNumThumbnails()

Returns the number of thumbnails stored in this IIOImage.

Returns:
the number of thumbnails, as an int.

getThumbnail

public BufferedImage getThumbnail(int index)

Returns a thumbnail associated with the main image.

Parameters:
index - the index of the desired thumbnail image.
Returns:
a thumbnail image, as a BufferedImage.
Throws:
IndexOutOfBoundsException - if the supplied index is negative or larger than the largest valid index.
ClassCastException - if a non-BufferedImage object is encountered in the list of thumbnails at the given index.
See Also:
getThumbnails(), setThumbnails(java.util.List<? extends java.awt.image.BufferedImage>)

getThumbnails

public List<? extends BufferedImage> getThumbnails()

Returns the current List of thumbnail BufferedImages, or null if none is set. A live reference is returned.

Returns:
the current List of BufferedImage thumbnails, or null.
See Also:
getThumbnail(int), setThumbnails(java.util.List<? extends java.awt.image.BufferedImage>)

setThumbnails

public void setThumbnails(List<? extends BufferedImage> thumbnails)

Sets the list of thumbnails to a new List of BufferedImages, or to null. The reference to the previous List is discarded.

The thumbnails argument must either be null or contain only BufferedImage objects.

Parameters:
thumbnails - a List of BufferedImage thumbnails, or null.
See Also:
getThumbnail(int), getThumbnails()

getMetadata

public IIOMetadata getMetadata()

Returns a reference to the current IIOMetadata object, or null is none is set.

Returns:
an IIOMetadata object, or null.
See Also:
setMetadata(javax.imageio.metadata.IIOMetadata)

setMetadata

public void setMetadata(IIOMetadata metadata)

Sets the IIOMetadata to a new object, or null.

Parameters:
metadata - an IIOMetadata object, or null.
See Also:
getMetadata()

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Documentation extracted from Debian's OpenJDK Development Kit package.
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