net.corda.contracts.asset / kotlin.collections.Iterable

### Extensions for kotlin.collections.Iterable

sumCash | `fun Iterable<ContractState>.sumCash(): Amount<Issued<Currency>>` Sums the cash states in the list, throwing an exception if there are none, or if any of the cash states cannot be added together (i.e. are different currencies or issuers).
sumCashBy | `fun Iterable<ContractState>.sumCashBy(owner: PublicKeyTree): Amount<Issued<Currency>>` Sums the cash states in the list belonging to a single owner, throwing an exception if there are none, or if any of the cash states cannot be added together (i.e. are different currencies or issuers).
sumCashOrNull | `fun Iterable<ContractState>.sumCashOrNull(): Amount<Issued<Currency>>?` Sums the cash states in the list, returning null if there are none.
sumCashOrZero | `fun Iterable<ContractState>.sumCashOrZero(currency: Issued<Currency>): Amount<Issued<Currency>>` Sums the cash states in the list, returning zero of the given currency+issuer if there are none.
sumCommodities | `fun Iterable<ContractState>.sumCommodities(): <ERROR CLASS>` Sums the cash states in the list, throwing an exception if there are none, or if any of the cash states cannot be added together (i.e. are different currencies).
sumCommoditiesOrNull | `fun Iterable<ContractState>.sumCommoditiesOrNull(): <ERROR CLASS>` Sums the cash states in the list, returning null if there are none.
sumCommoditiesOrZero | `fun Iterable<ContractState>.sumCommoditiesOrZero(currency: Issued<Commodity>): <ERROR CLASS>` Sums the cash states in the list, returning zero of the given currency if there are none.
sumObligations | `fun <P> Iterable<ContractState>.sumObligations(): Amount<Issued<Terms<P>>>` Sums the obligation states in the list, throwing an exception if there are none. All state objects in the list are presumed to be nettable.
sumObligationsOrNull | `fun <P> Iterable<ContractState>.sumObligationsOrNull(): Amount<Issued<Terms<P>>>?` Sums the obligation states in the list, returning null if there are none.
sumObligationsOrZero | `fun <P> Iterable<ContractState>.sumObligationsOrZero(issuanceDef: Issued<Terms<P>>): Amount<Issued<Terms<P>>>` Sums the obligation states in the list, returning zero of the given product if there are none.