gradle-master/subprojects/execution/src/main/java/org/gradle/internal/execution/history/BeforeExecutionState.java
/*
 * 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.internal.execution.history;

import com.google.common.collect.ImmutableSortedMap;
import org.gradle.internal.execution.steps.AfterExecutionResult;
import org.gradle.internal.fingerprint.CurrentFileCollectionFingerprint;
import org.gradle.internal.snapshot.FileSystemSnapshot;

import java.util.Optional;

/**
 * Captures the state of a {@link org.gradle.internal.execution.UnitOfWork} before execution.
 */
public interface BeforeExecutionState extends InputExecutionState {
    /**
     * {@inheritDoc}
     */
    @Override
    ImmutableSortedMap<String, CurrentFileCollectionFingerprint> getInputFileProperties();

    /**
     * Snapshots of the roots of output properties.
     *
     * This includes snapshots for the whole output {@link org.gradle.api.file.FileCollection}.
     *
     * @see PreviousExecutionState#getOutputFilesProducedByWork()
     * @see AfterExecutionResult#getAfterExecutionState()
     */
    ImmutableSortedMap<String, FileSystemSnapshot> getOutputFileLocationSnapshots();

    /**
     * Returns overlapping outputs if they are detected.
     *
     * @see org.gradle.internal.execution.UnitOfWork#getOverlappingOutputHandling()
     */
    Optional<OverlappingOutputs> getDetectedOverlappingOutputs();
}
