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Base interfaces and data structures for defining a deduplication workflow.

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/*
 * MIT License
 *
 * Copyright (c) 2019 bakdata GmbH
 *
 * 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.bakdata.dedupe.fusion;

import java.util.Optional;
import java.util.function.Function;
import lombok.NonNull;

/**
 * A callback that allows incomplete fusions to be treated either with direct repair algorithms or through side-channel
 * means (a.k.a ignore for now and repair asynchronously with the help of domain experts).
 */
@FunctionalInterface
public interface IncompleteFusionHandler extends Function, Optional>> {
    static  @NonNull IncompleteFusionHandler dontFuse() {
        return partiallyFusedValue -> Optional.empty();
    }

    @Override
    default @NonNull Optional> apply(final @NonNull FusedValue partiallyFusedValue) {
        return this.handlePartiallyFusedValue(partiallyFusedValue);
    }

    @NonNull Optional> handlePartiallyFusedValue(@NonNull FusedValue partiallyFusedValue);
}