/*
* @(#)IIOImage.java 1.21 04/05/05
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
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.
*
* <p> The image data may take the form of either a
* <code>RenderedImage</code>, or a <code>Raster</code>. Reader
* methods that return an <code>IIOImage</code> will always return a
* <code>BufferedImage</code> using the <code>RenderedImage</code>
* reference. Writer methods that accept an <code>IIOImage</code>
* will always accept a <code>RenderedImage</code>, and may optionally
* accept a <code>Raster</code>.
*
* <p> Exactly one of <code>getRenderedImage</code> and
* <code>getRaster</code> will return a non-<code>null</code> 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)
*
* @version 0.5
*/
public class IIOImage {
/**
* The <code>RenderedImage</code> being referenced.
*/
protected RenderedImage image;
/**
* The <code>Raster</code> being referenced.
*/
protected Raster raster;
/**
* A <code>List</code> of <code>BufferedImage</code> thumbnails,
* or <code>null</code>. Non-<code>BufferedImage</code> objects
* must not be stored in this <code>List</code>.
*/
protected List<? extends BufferedImage> thumbnails = null;
/**
* An <code>IIOMetadata</code> object containing metadata
* associated with the image.
*/
protected IIOMetadata metadata;
/**
* Constructs an <code>IIOImage</code> containing a
* <code>RenderedImage</code>, and thumbnails and metadata
* associated with it.
*
* <p> All parameters are stored by reference.
*
* <p> The <code>thumbnails</code> argument must either be
* <code>null</code> or contain only <code>BufferedImage</code>
* objects.
*
* @param image a <code>RenderedImage</code>.
* @param thumbnails a <code>List</code> of <code>BufferedImage</code>s,
* or <code>null</code>.
* @param metadata an <code>IIOMetadata</code> object, or
* <code>null</code>.
*
* @exception IllegalArgumentException if <code>image</code> is
* <code>null</code>.
*/
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 <code>IIOImage</code> containing a
* <code>Raster</code>, and thumbnails and metadata
* associated with it.
*
* <p> All parameters are stored by reference.
*
* @param raster a <code>Raster</code>.
* @param thumbnails a <code>List</code> of <code>BufferedImage</code>s,
* or <code>null</code>.
* @param metadata an <code>IIOMetadata</code> object, or
* <code>null</code>.
*
* @exception IllegalArgumentException if <code>raster</code> is
* <code>null</code>.
*/
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 <code>RenderedImage</code>, or
* <code>null</code> if only a <code>Raster</code> is available.
*
* @return a <code>RenderedImage</code>, or <code>null</code>.
*
* @see #setRenderedImage
*/
public RenderedImage getRenderedImage() {
synchronized(this) {
return image;
}
}
/**
* Sets the current <code>RenderedImage</code>. The value is
* stored by reference. Any existing <code>Raster</code> is
* discarded.
*
* @param image a <code>RenderedImage</code>.
*
* @exception IllegalArgumentException if <code>image</code> is
* <code>null</code>.
*
* @see #getRenderedImage
*/
public void setRenderedImage(RenderedImage image) {
synchronized(this) {
if (image == null) {
throw new IllegalArgumentException("image == null!");
}
this.image = image;
this.raster = null;
}
}
/**
* Returns <code>true</code> if this <code>IIOImage</code> stores
* a <code>Raster</code> rather than a <code>RenderedImage</code>.
*
* @return <code>true</code> if a <code>Raster</code> is
* available.
*/
public boolean hasRaster() {
synchronized(this) {
return (raster != null);
}
}
/**
* Returns the currently set <code>Raster</code>, or
* <code>null</code> if only a <code>RenderedImage</code> is
* available.
*
* @return a <code>Raster</code>, or <code>null</code>.
*
* @see #setRaster
*/
public Raster getRaster() {
synchronized(this) {
return raster;
}
}
/**
* Sets the current <code>Raster</code>. The value is
* stored by reference. Any existing <code>RenderedImage</code> is
* discarded.
*
* @param raster a <code>Raster</code>.
*
* @exception IllegalArgumentException if <code>raster</code> is
* <code>null</code>.
*
* @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
* <code>IIOImage</code>.
*
* @return the number of thumbnails, as an <code>int</code>.
*/
public int getNumThumbnails() {
return thumbnails == null ? 0 : thumbnails.size();
}
/**
* 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</code>.
*
* @exception IndexOutOfBoundsException if the supplied index is
* negative or larger than the largest valid index.
* @exception ClassCastException if a
* non-<code>BufferedImage</code> 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 <code>List</code> of thumbnail
* <code>BufferedImage</code>s, or <code>null</code> if none is
* set. A live reference is returned.
*
* @return the current <code>List</code> of
* <code>BufferedImage</code> thumbnails, or <code>null</code>.
*
* @see #getThumbnail(int)
* @see #setThumbnails
*/
public List<? extends BufferedImage> getThumbnails() {
return thumbnails;
}
/**
* Sets the list of thumbnails to a new <code>List</code> of
* <code>BufferedImage</code>s, or to <code>null</code>. The
* reference to the previous <code>List</code> is discarded.
*
* <p> The <code>thumbnails</code> argument must either be
* <code>null</code> or contain only <code>BufferedImage</code>
* objects.
*
* @param thumbnails a <code>List</code> of
* <code>BufferedImage</code> thumbnails, or <code>null</code>.
*
* @see #getThumbnail(int)
* @see #getThumbnails
*/
public void setThumbnails(List<? extends BufferedImage> thumbnails) {
this.thumbnails = thumbnails;
}
/**
* Returns a reference to the current <code>IIOMetadata</code>
* object, or <code>null</code> is none is set.
*
* @return an <code>IIOMetadata</code> object, or <code>null</code>.
*
* @see #setMetadata
*/
public IIOMetadata getMetadata() {
return metadata;
}
/**
* Sets the <code>IIOMetadata</code> to a new object, or
* <code>null</code>.
*
* @param metadata an <code>IIOMetadata</code> object, or
* <code>null</code>.
*
* @see #getMetadata
*/
public void setMetadata(IIOMetadata metadata) {
this.metadata = metadata;
}
}
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