Module java.desktop

Package javax.imageio

Class IIOImage

java.lang.Object

javax.imageio.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)

Field Summary

Fields

Modifier and Type	Field	Description
protected RenderedImage	image	The RenderedImage being referenced.
protected IIOMetadata	metadata	An IIOMetadata object containing metadata associated with the image.
protected Raster	raster	The Raster being referenced.
protected List<? extends BufferedImage>	thumbnails	A List of BufferedImage thumbnails, or null.

Constructor Summary

Constructors

Constructor	Description
IIOImage(Raster raster, List<? extends BufferedImage> thumbnails, IIOMetadata metadata)	Constructs an IIOImage containing a Raster, and thumbnails and metadata associated with it.
IIOImage(RenderedImage image, List<? extends BufferedImage> thumbnails, IIOMetadata metadata)	Constructs an IIOImage containing a RenderedImage, and thumbnails and metadata associated with it.

Method Summary

Modifier and Type	Method	Description
IIOMetadata	getMetadata()	Returns a reference to the current IIOMetadata object, or null is none is set.
int	getNumThumbnails()	Returns the number of thumbnails stored in this IIOImage.
Raster	getRaster()	Returns the currently set Raster, or null if only a RenderedImage is available.
RenderedImage	getRenderedImage()	Returns the currently set RenderedImage, or null if only a Raster is available.
BufferedImage	getThumbnail(int index)	Returns a thumbnail associated with the main image.
List<? extends BufferedImage>	getThumbnails()	Returns the current List of thumbnail BufferedImages, or null if none is set.
boolean	hasRaster()	Returns true if this IIOImage stores a Raster rather than a RenderedImage.
void	setMetadata(IIOMetadata metadata)	Sets the IIOMetadata to a new object, or null.
void	setRaster(Raster raster)	Sets the current Raster.
void	setRenderedImage(RenderedImage image)	Sets the current RenderedImage.
void	setThumbnails(List<? extends BufferedImage> thumbnails)	Sets the list of thumbnails to a new List of BufferedImages, or to null.

Methods declared in class java.lang.Object

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

Field Details

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.

Constructor Details

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.

Method Details

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()