/*
 * Copyright 2006-2012 ICEsoft Technologies Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an "AS
 * IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either * express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

package org.icepdf.core.pobjects;

import org.icepdf.core.util.Library;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Hashtable;

/**
 * A PDF document may contain thumbnail images representing the contents of its
 * pages in miniature form. A conforming reader may display these images on the
 * screen, allowing the user to navigate to a page by clicking its thumbnail
 * image:
 * <p/>
 * <b>NOTE</b>Thumbnail images are not required, and may be included for some
 * pages and not for others.
 */
public class Thumbnail extends Dictionary {

    private Stream thumbStream;
    private boolean initialized;

    // thumb image
    private BufferedImage image;

    // dimensions
    private Dimension dimension;

    public Thumbnail(Library library, Hashtable entries) {
        super(library, entries);
        Object thumb = library.getObject(entries, "Thumb");
        if (thumb != null && thumb instanceof Stream) {
            // get the thumb image.
            thumbStream = (Stream) thumb;

            // grab its bounds.
            int width = library.getInt(thumbStream.entries, "Width");
            int height = library.getInt(thumbStream.entries, "Height");
            dimension = new Dimension(width,height);
            // the image is lazy loaded on the getImage() call.
        }
    }


    public void init(){
        Resources resource = new Resources(library, thumbStream.entries);
        image =  thumbStream.getImage(null, resource, false);
        initialized = true;
    }

    public BufferedImage getImage() {
        if (!initialized){
            init();
        }
        return image;
    }

    public Dimension getDimension() {
        return dimension;
    }
}