DMDirc-Client/src/main/java/com/dmdirc/ui/messages/MultiEventFormatProvider.java

/*
 * Copyright (c) 2006-2017 DMDirc Developers
 *
 * 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.dmdirc.ui.messages;

import com.dmdirc.events.DisplayableEvent;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;

/**
 * Provides formats from multiple other {@link EventFormatProvider}.
 */
public class MultiEventFormatProvider implements EventFormatProvider {

    /** Providers to test for formats, in order. */
    private final List<EventFormatProvider> providers = new ArrayList<>();

    public MultiEventFormatProvider(final EventFormatProvider ... providers) {
        this.providers.addAll(Arrays.asList(providers));
    }

    public void addProvider(final EventFormatProvider provider) {
        providers.add(provider);
    }

    public void removeProvider(final EventFormatProvider provider) {
        providers.remove(provider);
    }

    @Override
    public Optional<EventFormat> getFormat(final Class<? extends DisplayableEvent> eventType) {
        return providers.stream()
                .map(provider -> provider.getFormat(eventType))
                .filter(Optional::isPresent)
                .findFirst()
                .map(Optional::get);
    }

    @Override
    public void reload() {
        for (final EventFormatProvider evp : providers) {
            evp.reload();
        }
    }
}