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A themeable Look and Feel for java swing

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/*
 * MIT License
 *
 * Copyright (c) 2019-2021 Jannis Weis
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 * associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
 * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package com.github.weisj.darklaf.theme.laf;

import java.util.ServiceLoader;

import com.github.weisj.darklaf.theme.Theme;
import com.google.errorprone.annotations.Immutable;

public class SynthesisedThemedLaf extends DelegatingThemedLaf {

    public SynthesisedThemedLaf(final Theme theme) {
        super(theme, BaseLafProvider.INSTANCE.createBaseLaf());
    }

    @Immutable
    public interface ThemedLafProvider {
        ThemedLookAndFeel create();
    }

    private enum BaseLafProvider {
        INSTANCE {
            private final ThemedLafProvider provider = ServiceLoader.load(ThemedLafProvider.class).iterator().next();

            @Override
            ThemedLookAndFeel createBaseLaf() {
                return provider.create();
            }
        };

        abstract ThemedLookAndFeel createBaseLaf();
    }
}