}
    }

    /**
     * All of the files that will be signed by this operation.
     */
    public FileCollection getFilesToSign() {
        return newSignatureFileCollection(input -> input.getToSign());
    }

    /**
     * All of the signature files that will be generated by this operation.
     */

        throw new UnsupportedOperationException();
    }

    /**
     * All of the files that will be signed by this task.
     */
    @Internal
    public FileCollection getFilesToSign() {
        return getFileCollectionFactory().fixed("Task \'" + getPath() + "\' files to sign",
            Lists.newLinkedList(Iterables.filter(Iterables.transform(getSignatures(), Signature::getToSign), Predicates.notNull())));