/**

 * 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.ServiceLoader;

/**

 *

 * @author antonepple

 */

public abstract class GraphicsEnvironment {

    private static GraphicsEnvironment DEFAULT;

    public GraphicsEnvironment getDefault() {

        if (DEFAULT == null) {

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

            DEFAULT = loader.iterator().next();

        }

        return DEFAULT == null ? getDummyInstance() : DEFAULT;

    }

    public abstract Image getImageForPath(String path);

    public abstract LinearGradient createLinearGradient();

    public abstract Pattern createPattern();

    public abstract RadialGradient createRadialGradient();

    public abstract TextMetrics createTextMetrics();

    private GraphicsEnvironment getDummyInstance() {

        return new GraphicsEnvironment() {

            @Override

            public Image getImageForPath(String path) {

               return new Image() {

                   @Override

                   public int getHeight() {

                     return 0;

                   }

                   @Override

                   public int getWidth() {

                       return 0;

                   }

               };

            }

            @Override

            public LinearGradient createLinearGradient() {

                return new LinearGradient() {

                    @Override

                    public void addColorStop(double position, String color) {

                    }

                };

            }

            @Override

            public Pattern createPattern() {

               return new Pattern() {

};

            }

            @Override

            public RadialGradient createRadialGradient() {

                return new RadialGradient() {

                    @Override

                    public void addColorStop(double position, String color) {

                    }

                };

            }

            @Override

            public TextMetrics createTextMetrics() {

                return new TextMetrics() {

                    @Override

                    public double getHeight() {

                        return 0;

                    }

                    @Override

                    public double getWidth() {

                        return 0;

                    }

                };

            }

        };

    }

}