);

        ImmutableSortedMap<String, ValueSnapshot> identityInputProperties = inputs.getValueSnapshots();
        ImmutableSortedMap<String, CurrentFileCollectionFingerprint> identityInputFileProperties = inputs.getFileFingerprints();
        Identity identity = work.identify(identityInputProperties, identityInputFileProperties);

        return new IdentityContext(context, identityInputProperties, identityInputFileProperties, identity);
    }

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

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

        ImmutableSortedMap<String, CurrentFileCollectionFingerprint> sourceFileProperties = newInputs.getFileFingerprints();
        if (sourceFileProperties.isEmpty()) {
            return executeWithNonEmptySources(work, context);
        } else {

            return union(knownCurrentValueSnapshots, valueSnapshots);
        }

        @Override
        public ImmutableSortedMap<String, CurrentFileCollectionFingerprint> getFileFingerprints() {
            return fileFingerprints;
        }

        @Override
        public ImmutableSortedMap<String, CurrentFileCollectionFingerprint> getAllFileFingerprints() {

            hasher.putString(entry.getKey());
            entry.getValue().appendToHasher(hasher);
        }
        for (Map.Entry<String, CurrentFileCollectionFingerprint> entry : result.getFileFingerprints().entrySet()) {
            hasher.putString(entry.getKey());
            hasher.putHash(entry.getValue().getHash());
        }
    }