import java.util.Map;

public class SerializableFileCollectionFingerprint implements FileCollectionFingerprint {

    private final Map<String, FileSystemLocationFingerprint> fingerprints;
    private final ImmutableMultimap<String, HashCode> rootHashes;
    private final HashCode strategyConfigurationHash;

import org.gradle.internal.execution.history.PreviousExecutionState;
import org.gradle.internal.execution.history.impl.DefaultPreviousExecutionState;
import org.gradle.internal.execution.history.impl.SerializableFileCollectionFingerprint;
import org.gradle.internal.fingerprint.CurrentFileCollectionFingerprint;
import org.gradle.internal.fingerprint.FileCollectionFingerprint;

import java.util.HashMap;
import java.util.Map;

            "/3", TestHashCodes.hashCodeFrom(1234))
        def strategyConfigurationHash = TestHashCodes.hashCodeFrom(6543)
        when:
        def out = serialize(new SerializableFileCollectionFingerprint(
            '/1': new DefaultFileSystemLocationFingerprint("1", FileType.Directory, FileSystemLocationFingerprint.DIR_SIGNATURE),

        }
        ImmutableMultimap<String, HashCode> rootHashes = readRootHashes(decoder);
        HashCode strategyConfigurationHash = hashCodeSerializer.read(decoder);
        return new SerializableFileCollectionFingerprint(fingerprints, rootHashes, strategyConfigurationHash);
    }

    private ImmutableMultimap<String, HashCode> readRootHashes(Decoder decoder) throws IOException {
        int numberOfRoots = decoder.readSmallInt();

        def strategyConfigurationHash = TestHashCodes.hashCodeFrom(1234)
        def currentFingerprint = new SerializableFileCollectionFingerprint(current, ImmutableMultimap.of("some", TestHashCodes.hashCodeFrom(1234)), strategyConfigurationHash)
        def previousFingerprint = new SerializableFileCollectionFingerprint(previous, ImmutableMultimap.of("some", TestHashCodes.hashCodeFrom(4321)), strategyConfigurationHash)

        def strategyConfigurationHash = TestHashCodes.hashCodeFrom(5432)
        def currentFingerprint = new SerializableFileCollectionFingerprint(current, ImmutableMultimap.of("some", TestHashCodes.hashCodeFrom(1234)), strategyConfigurationHash)
        def previousFingerprint = new SerializableFileCollectionFingerprint(previous, ImmutableMultimap.of("some", TestHashCodes.hashCodeFrom(4321)), strategyConfigurationHash)

        return copyOfSorted(transformValues(
            fingerprints,
            value -> value.archive(SerializableFileCollectionFingerprint::new)
        ));
    }