/*

 * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

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}, 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 {@code RenderedImage} being referenced.

     */

    protected RenderedImage image;

    /**

     * The {@code Raster} being referenced.

     */

    protected Raster raster;

    /**

     * 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 {@code IIOMetadata} object containing metadata

     * associated with the image.

     */

    protected IIOMetadata metadata;

    /**

     * 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 {@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 {@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 {@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 {@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 {@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 {@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

     * {@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.

     *

     * @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 {@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 {@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 {@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 {@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;

    }

}