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/*
 * Copyright 2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.api.internal.tasks;

import com.google.common.collect.ImmutableList;
import org.gradle.caching.internal.origin.OriginMetadata;
import org.gradle.internal.execution.caching.CachingState;

import java.util.List;
import java.util.Optional;

public interface TaskExecuterResult {
    /**
     * Returns the reasons for executing this task. An empty list means the task was not executed.
     */
    List getExecutionReasons();

    /**
     * Whether the task was executed incrementally.
     */
    boolean executedIncrementally();

    /**
     * If the execution resulted in some previous output being reused, this returns its origin metadata.
     */
    Optional getReusedOutputOriginMetadata();

    /**
     * The caching state of the task, including all its captured inputs and the cache key if calculated.
     */
    CachingState getCachingState();

    TaskExecuterResult WITHOUT_OUTPUTS = new TaskExecuterResult() {
        @Override
        public List getExecutionReasons() {
            return ImmutableList.of();
        }

        @Override
        public boolean executedIncrementally() {
            return false;
        }

        @Override
        public Optional getReusedOutputOriginMetadata() {
            return Optional.empty();
        }

        @Override
        public CachingState getCachingState() {
            return CachingState.NOT_DETERMINED;
        }
    };
}