/**

 * 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;

    }

    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);

    }

    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;

    }

}