ImageCachingEditorKit.java

/**
 * Copyright (c) 2005-2017, KoLmafia development team
 * http://kolmafia.sourceforge.net/
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  [1] Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *  [2] Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in
 *      the documentation and/or other materials provided with the
 *      distribution.
 *  [3] Neither the name "KoLmafia" nor the names of its contributors may
 *      be used to endorse or promote products derived from this software
 *      without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package net.sourceforge.kolmafia;

import java.io.File;
import java.io.IOException;

import java.net.URL;

import javax.swing.text.Element;
import javax.swing.text.StyleConstants;
import javax.swing.text.View;
import javax.swing.text.ViewFactory;

import javax.swing.text.html.HTML;
import javax.swing.text.html.HTMLEditorKit;
import javax.swing.text.html.ImageView;

import net.sourceforge.kolmafia.utilities.FileUtilities;

public class ImageCachingEditorKit
	extends HTMLEditorKit
{
	private static final ImageCachingViewFactory DEFAULT_FACTORY = new ImageCachingViewFactory();

	@Override
	public ViewFactory getViewFactory()
	{
		return ImageCachingEditorKit.DEFAULT_FACTORY;
	}

	private static class ImageCachingViewFactory
		extends HTMLFactory
	{
		@Override
		public View create( final Element elem )
		{
			if ( elem.getAttributes().getAttribute( StyleConstants.NameAttribute ) == HTML.Tag.IMG )
			{
				return new CachedImageView( elem );
			}

			return super.create( elem );
		}
	}

	private static class CachedImageView
		extends ImageView
	{
		public CachedImageView( final Element elem )
		{
			super( elem );
		}

		@Override
		public URL getImageURL()
		{
			String src = (String) this.getElement().getAttributes().getAttribute( HTML.Attribute.SRC );

			if ( src == null )
			{
				return null;
			}

			File imageFile = FileUtilities.downloadImage( src );
			
			try
			{
				return imageFile.toURI().toURL();
			}
			catch ( IOException e )
			{
				return null;
			}
		}
	}
}