> + private final String marker;
> +
> + @ConstructorProperties({ "VaultList", "Marker" })
> + public PaginatedVaultCollection(Iterable<VaultMetadata> vaults, String
> marker) {
> + this.vaults = vaults;
> + this.marker = marker;
> + }
> +
> + @Override
> + public Iterator<VaultMetadata> iterator() {
> + return vaults.iterator();
> + }
> +
> + @Override
> + public Optional<Object> nextMarker() {
> + return marker == null ? Optional.absent() : Optional.of((Object)
> marker);
Use `Optional.fromNullable(marker)` instead?
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