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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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package javax.imageio;

import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.util.List;
import javax.imageio.metadata.IIOMetadata;


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:
/**
 * A simple container class to aggregate an image, a set of
 * thumbnail (preview) images, and an object representing metadata
 * associated with the image.
 *
 * <p> The image data may take the form of either a
 * {@code RenderedImage}, or a {@code Raster}.  Reader
 * methods that return an {@code IIOImage} will always return a
 * {@code BufferedImage} using the {@code RenderedImage}
 * reference.  Writer methods that accept an {@code IIOImage}
 * will always accept a {@code RenderedImage}, and may optionally
 * accept a {@code Raster}.
 *
 * <p> Exactly one of {@code getRenderedImage} and
 * {@code getRaster} will return a non-{@code null} value.
 * Subclasses are responsible for ensuring this behavior.
 *
 * @see ImageReader#readAll(int, ImageReadParam)
 * @see ImageReader#readAll(java.util.Iterator)
 * @see ImageWriter#write(javax.imageio.metadata.IIOMetadata,
 *                        IIOImage, ImageWriteParam)
 * @see ImageWriter#write(IIOImage)
 * @see ImageWriter#writeToSequence(IIOImage, ImageWriteParam)
 * @see ImageWriter#writeInsert(int, IIOImage, ImageWriteParam)
 *
 */
public class IIOImage {

    
The RenderedImage being referenced. 
/**
     * The {@code RenderedImage} being referenced.
     */
    protected RenderedImage image;

    
The Raster being referenced. 
/**
     * The {@code Raster} being referenced.
     */
    protected Raster raster;

    
A List of BufferedImage thumbnails, or null. Non-BufferedImage objects must not be stored in this List. 
/**
     * A {@code List} of {@code BufferedImage} thumbnails,
     * or {@code null}.  Non-{@code BufferedImage} objects
     * must not be stored in this {@code List}.
     */
    protected List<? extends BufferedImage> thumbnails = null;

    
An IIOMetadata object containing metadata associated with the image. 
/**
     * An {@code IIOMetadata} object containing metadata
     * associated with the image.
     */
    protected 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. 
Params:
  • image – a RenderedImage.
  • thumbnails – a List of BufferedImages, or null.
  • metadata – an IIOMetadata object, or null.
Throws:
/**
     * Constructs an {@code IIOImage} containing a
     * {@code RenderedImage}, and thumbnails and metadata
     * associated with it.
     *
     * <p> All parameters are stored by reference.
     *
     * <p> The {@code thumbnails} argument must either be
     * {@code null} or contain only {@code BufferedImage}
     * objects.
     *
     * @param image a {@code RenderedImage}.
     * @param thumbnails a {@code List} of {@code BufferedImage}s,
     * or {@code null}.
     * @param metadata an {@code IIOMetadata} object, or
     * {@code null}.
     *
     * @exception IllegalArgumentException if {@code image} is
     * {@code null}.
     */
    public IIOImage(RenderedImage image,
                    List<? extends BufferedImage> thumbnails,
                    IIOMetadata metadata) {
        if (image == null) {
            throw new IllegalArgumentException("image == null!");
        }
        this.image = image;
        this.raster = null;
        this.thumbnails = thumbnails;
        this.metadata = metadata;
    }

    
Constructs an IIOImage containing a Raster, and thumbnails and metadata associated with it. 
 All parameters are stored by reference.

Params:
  • raster – a Raster.
  • thumbnails – a List of BufferedImages, or null.
  • metadata – an IIOMetadata object, or null.
Throws:
/**
     * Constructs an {@code IIOImage} containing a
     * {@code Raster}, and thumbnails and metadata
     * associated with it.
     *
     * <p> All parameters are stored by reference.
     *
     * @param raster a {@code Raster}.
     * @param thumbnails a {@code List} of {@code BufferedImage}s,
     * or {@code null}.
     * @param metadata an {@code IIOMetadata} object, or
     * {@code null}.
     *
     * @exception IllegalArgumentException if {@code raster} is
     * {@code null}.
     */
    public IIOImage(Raster raster,
                    List<? extends BufferedImage> thumbnails,
                    IIOMetadata metadata) {
        if (raster == null) {
            throw new IllegalArgumentException("raster == null!");
        }
        this.raster = raster;
        this.image = null;
        this.thumbnails = thumbnails;
        this.metadata = metadata;
    }

    
Returns the currently set RenderedImage, or null if only a Raster is available. 
See Also:
Returns:a RenderedImage, or null.
/**
     * Returns the currently set {@code RenderedImage}, or
     * {@code null} if only a {@code Raster} is available.
     *
     * @return a {@code RenderedImage}, or {@code null}.
     *
     * @see #setRenderedImage
     */
    public RenderedImage getRenderedImage() {
        synchronized(this) {
            return image;
        }
    }

    
Sets the current RenderedImage. The value is stored by reference. Any existing Raster is discarded. 
Params:
  • image – a RenderedImage.
Throws:
See Also:
/**
     * Sets the current {@code RenderedImage}.  The value is
     * stored by reference.  Any existing {@code Raster} is
     * discarded.
     *
     * @param image a {@code RenderedImage}.
     *
     * @exception IllegalArgumentException if {@code image} is
     * {@code null}.
     *
     * @see #getRenderedImage
     */
    public void setRenderedImage(RenderedImage image) {
        synchronized(this) {
            if (image == null) {
                throw new IllegalArgumentException("image == null!");
            }
            this.image = image;
            this.raster = null;
        }
    }

    
Returns true if this IIOImage stores a Raster rather than a RenderedImage. 
Returns:true if a Raster is available.
/**
     * Returns {@code true} if this {@code IIOImage} stores
     * a {@code Raster} rather than a {@code RenderedImage}.
     *
     * @return {@code true} if a {@code Raster} is
     * available.
     */
    public boolean hasRaster() {
        synchronized(this) {
            return (raster != null);
        }
    }

    
Returns the currently set Raster, or null if only a RenderedImage is available. 
See Also:
Returns:a Raster, or null.
/**
     * Returns the currently set {@code Raster}, or
     * {@code null} if only a {@code RenderedImage} is
     * available.
     *
     * @return a {@code Raster}, or {@code null}.
     *
     * @see #setRaster
     */
    public Raster getRaster() {
        synchronized(this) {
            return raster;
        }
    }

    
Sets the current Raster. The value is stored by reference. Any existing RenderedImage is discarded. 
Params:
  • raster – a Raster.
Throws:
See Also:
/**
     * Sets the current {@code Raster}.  The value is
     * stored by reference.  Any existing {@code RenderedImage} is
     * discarded.
     *
     * @param raster a {@code Raster}.
     *
     * @exception IllegalArgumentException if {@code raster} is
     * {@code null}.
     *
     * @see #getRaster
     */
    public void setRaster(Raster raster) {
        synchronized(this) {
            if (raster == null) {
                throw new IllegalArgumentException("raster == null!");
            }
            this.raster = raster;
            this.image = null;
        }
    }

    
Returns the number of thumbnails stored in this IIOImage. 
Returns:the number of thumbnails, as an int.
/**
     * Returns the number of thumbnails stored in this
     * {@code IIOImage}.
     *
     * @return the number of thumbnails, as an {@code int}.
     */
    public int getNumThumbnails() {
        return thumbnails == null ? 0 : thumbnails.size();
    }

    
Returns a thumbnail associated with the main image.

Params:
  • index – the index of the desired thumbnail image.
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:
Returns:a thumbnail image, as a BufferedImage.
/**
     * Returns a thumbnail associated with the main image.
     *
     * @param index the index of the desired thumbnail image.
     *
     * @return a thumbnail image, as a {@code BufferedImage}.
     *
     * @exception IndexOutOfBoundsException if the supplied index is
     * negative or larger than the largest valid index.
     * @exception ClassCastException if a
     * non-{@code BufferedImage} object is encountered in the
     * list of thumbnails at the given index.
     *
     * @see #getThumbnails
     * @see #setThumbnails
     */
    public BufferedImage getThumbnail(int index) {
        if (thumbnails == null) {
            throw new IndexOutOfBoundsException("No thumbnails available!");
        }
        return (BufferedImage)thumbnails.get(index);
    }

    
Returns the current List of thumbnail BufferedImages, or null if none is set. A live reference is returned. 
See Also:
Returns:the current List of BufferedImage thumbnails, or null.
/**
     * Returns the current {@code List} of thumbnail
     * {@code BufferedImage}s, or {@code null} if none is
     * set.  A live reference is returned.
     *
     * @return the current {@code List} of
     * {@code BufferedImage} thumbnails, or {@code null}.
     *
     * @see #getThumbnail(int)
     * @see #setThumbnails
     */
    public List<? extends BufferedImage> getThumbnails() {
        return 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. 
Params:
  • thumbnails – a List of BufferedImage thumbnails, or null.
See Also:
/**
     * Sets the list of thumbnails to a new {@code List} of
     * {@code BufferedImage}s, or to {@code null}.  The
     * reference to the previous {@code List} is discarded.
     *
     * <p> The {@code thumbnails} argument must either be
     * {@code null} or contain only {@code BufferedImage}
     * objects.
     *
     * @param thumbnails a {@code List} of
     * {@code BufferedImage} thumbnails, or {@code null}.
     *
     * @see #getThumbnail(int)
     * @see #getThumbnails
     */
    public void setThumbnails(List<? extends BufferedImage> thumbnails) {
        this.thumbnails = thumbnails;
    }

    
Returns a reference to the current IIOMetadata object, or null is none is set. 
See Also:
Returns:an IIOMetadata object, or null.
/**
     * Returns a reference to the current {@code IIOMetadata}
     * object, or {@code null} is none is set.
     *
     * @return an {@code IIOMetadata} object, or {@code null}.
     *
     * @see #setMetadata
     */
    public IIOMetadata getMetadata() {
        return metadata;
    }

    
Sets the IIOMetadata to a new object, or null. 
Params:
  • metadata – an IIOMetadata object, or null.
See Also:
/**
     * Sets the {@code IIOMetadata} to a new object, or
     * {@code null}.
     *
     * @param metadata an {@code IIOMetadata} object, or
     * {@code null}.
     *
     * @see #getMetadata
     */
    public void setMetadata(IIOMetadata metadata) {
        this.metadata = metadata;
    }
}