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Result.java
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Result.java
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/*
* Copyright (c) 2019 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.internal.utils.persistentactors.results;
import java.util.concurrent.CompletionStage;
import java.util.function.Function;
import org.eclipse.ditto.base.model.signals.events.Event;
/**
* The result of applying the strategy to the given command.
*/
public interface Result<E extends Event<?>> {
/**
* Evaluate the result by a visitor.
*
* @param visitor the visitor to evaluate the result, typically the persistent actor itself.
*/
void accept(final ResultVisitor<E> visitor);
/**
* Convert the result with a function.
*
* @param mappingFunction the mapping function.
* @param <F> the new event type of the result.
* @return the new result.
* @since 2.0.0
*/
<F extends Event<?>> Result<F> map(Function<CompletionStage<E>, CompletionStage<F>> mappingFunction);
/**
* @return the empty result
*/
static <E extends Event<?>> Result<E> empty() {
return ResultFactory.emptyResult();
}
}