/**

  * Back 2 Browser Bytecode Translator

  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, version 2 of the License.

  *

  * This program 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 for more details.

  *

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

  * along with this program. Look for COPYING file in the top folder.

  * If not, see http://opensource.org/licenses/GPL-2.0.

  */

 package net.java.html.canvas;

 import java.util.Objects;

 import java.util.ServiceLoader;

 import net.java.html.canvas.spi.GraphicsEnvironment;

 /**

  * Image represents an Image Resource defined by a path.

  *

  * @author antonepple

  */

 public final class Image {

     private String src;

     private int cacheHash;

     private Object cached;

     /** Creates a new image referencing a specified URL.

      * @param src the (relative) URL to the image

      * @return an object representing the image

      */

     public static Image create(String src) {

         return new Image(src);

     }

     private Image(String src) {

         this.src = src;

     }

     void cache(Object toCache) {

         this.cached = toCache;

         cacheHash = hashCode();

     }

     private boolean isCached() {

         return cacheHash == hashCode();

     }

     Object getCached() {

         return isCached() ? cached : null;

     }

     public String getSrc() {

         return src;

     }

     /**

      * get the width of this Image. Might be an expensive operation, depending on the 

      * GraphicsEnvironment, it might need to be rendered.

      * @return the width of this Image.

      */

     public int getWidth() {

         ServiceLoader<GraphicsEnvironment> loader = ServiceLoader.load(GraphicsEnvironment.class);

         GraphicsEnvironment ge = null;

         for (GraphicsEnvironment graphicsEnvironment : loader) {

             ge = graphicsEnvironment;

             break;

         }

         return ge.getWidth(this, cached);

     }

     /**

      * get the height of this Image. Might be an expensive operation, depending on the 

      * GraphicsEnvironment, it might need to be rendered.

      * @return the height of this Image.

      */

     public int getHeight() {

         ServiceLoader<GraphicsEnvironment> loader = ServiceLoader.load(GraphicsEnvironment.class);

         GraphicsEnvironment ge = null;

         for (GraphicsEnvironment graphicsEnvironment : loader) {

             ge = graphicsEnvironment;

             break;

         }

         return ge.getHeight(this, cached);

     }

     @Override

     public int hashCode() {

         int hash = 7;

         hash = 59 * hash + Objects.hashCode(this.src) ^ (cached == null ? 1231 : 1237);

         return hash;

     }

     @Override

     public boolean equals(Object obj) {

         if (obj == null) {

             return false;

         }

         if (getClass() != obj.getClass()) {

             return false;

         }

         final Image other = (Image) obj;

         if (!Objects.equals(this.src, other.src)) {

             return false;

         }

         if ((cached == null) != (other.getCached() == null)) {

             return false;

         }

         return true;

     }

 }