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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.event;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.function.BiConsumer;

public class ThemeEventSupport> {

    private final List listenerList = Collections.synchronizedList(new ArrayList<>());

    public void addListener(final T listener) {
        listenerList.add(listener);
    }

    public void removeListener(final T listener) {
        listenerList.remove(listener);
    }

    public void dispatchEvent(final E event) {
        dispatchEvent(event, ThemeEventListener::onEvent);
    }

    public void dispatchEvent(final E event, final BiConsumer consumer) {
        synchronized (listenerList) {
            new ArrayList<>(listenerList).forEach(listener -> {
                if (listener != null) consumer.accept(listener, event);
            });
        }
    }
}