import java.util.Map;

/**
 * A file collection fingerprint taken during this build.
 */
public interface CurrentFileCollectionFingerprint extends FileCollectionFingerprint {
    /**
     * Returns the combined hash of the contents of this {@link CurrentFileCollectionFingerprint}.
     */
    HashCode getHash();

    /**
     * An identifier for the strategy.
     *
     * Used to select a compare strategy.

            }
        }
    }

    protected abstract C recreateContextWithNewInputFiles(C context, ImmutableSortedMap<String, CurrentFileCollectionFingerprint> inputFiles);

    private static boolean hasEmptySources(ImmutableSortedMap<String, CurrentFileCollectionFingerprint> sourceFileProperties, ImmutableSet<String> propertiesRequiringIsEmptyCheck, UnitOfWork work) {
        if (propertiesRequiringIsEmptyCheck.isEmpty()) {

    public DefaultInputFileChanges(SortedMap<String, FileCollectionFingerprint> previous, SortedMap<String, CurrentFileCollectionFingerprint> current) {
        super(previous, current, TITLE);
    }

    @Override
    public boolean accept(String propertyName, ChangeVisitor visitor) {
        CurrentFileCollectionFingerprint currentFileCollectionFingerprint = current.get(propertyName);

    }

    public Iterable<FileChange> getObjectFileChanges(Object parameter) {
        CurrentFileCollectionFingerprint currentFileCollectionFingerprint = currentInputs.get(incrementalInputProperties.getPropertyNameFor(parameter));
        return () -> getAllFileChanges(currentFileCollectionFingerprint).iterator();
    }

    @Override
    public Iterable<InputFileDetails> getAllFileChanges() {

        /**
         * Returns the files fingerprinted just now.
         */
        ImmutableSortedMap<String, CurrentFileCollectionFingerprint> getFileFingerprints();

        /**
         * Returns all the file fingerprints, including the previously known ones.
         */
        ImmutableSortedMap<String, CurrentFileCollectionFingerprint> getAllFileFingerprints();

        /**

        private final ImmutableSortedMap<String, CurrentFileCollectionFingerprint> knownCurrentFingerprints;

        private final ImmutableSortedMap.Builder<String, ValueSnapshot> valueSnapshotsBuilder = ImmutableSortedMap.naturalOrder();
        private final ImmutableSortedMap.Builder<String, CurrentFileCollectionFingerprint> fingerprintsBuilder = ImmutableSortedMap.naturalOrder();

import org.gradle.internal.fingerprint.CurrentFileCollectionFingerprint;
import org.gradle.internal.fingerprint.FileCollectionFingerprint;

public interface IncrementalInputProperties {
    String getPropertyNameFor(Object value);
    InputFileChanges nonIncrementalChanges(ImmutableSortedMap<String, FileCollectionFingerprint> previous, ImmutableSortedMap<String, CurrentFileCollectionFingerprint> current);

    protected final SortedMap<String, FileCollectionFingerprint> previous;
    protected final SortedMap<String, CurrentFileCollectionFingerprint> current;
    private final String title;

    protected AbstractFingerprintChanges(SortedMap<String, FileCollectionFingerprint> previous, SortedMap<String, CurrentFileCollectionFingerprint> current, String title) {
        this.previous = previous;
        this.current = current;
        this.title = title;

import com.google.common.collect.ImmutableSortedMap;
import org.gradle.internal.execution.history.BeforeExecutionState;
import org.gradle.internal.execution.history.OverlappingOutputs;
import org.gradle.internal.fingerprint.CurrentFileCollectionFingerprint;
import org.gradle.internal.snapshot.FileSystemSnapshot;
import org.gradle.internal.snapshot.ValueSnapshot;
import org.gradle.internal.snapshot.impl.ImplementationSnapshot;

import javax.annotation.Nullable;

        SnapshotTaskInputsResultFilePropertyVisitState state = new SnapshotTaskInputsResultFilePropertyVisitState(visitor, propertySpecsByName);
        for (Map.Entry<String, CurrentFileCollectionFingerprint> entry : inputFileProperties.entrySet()) {
            CurrentFileCollectionFingerprint fingerprint = entry.getValue();

            state.propertyName = entry.getKey();
            state.propertyHash = fingerprint.getHash();