com.r3corda.core.contracts.clauses / GroupClauseVerifier

# GroupClauseVerifier

`abstract class GroupClauseVerifier<S : ContractState, C : CommandData, K : Any> : Clause<ContractState, C, Unit>`

### Constructors

<init> | `GroupClauseVerifier(clause: Clause<S, C, K>)`

### Properties

clause | `val clause: Clause<S, C, K>`

### Inherited Properties

requiredCommands | `open val requiredCommands: Set<Class<out CommandData>>` Determine whether this clause runs or not

### Functions

getExecutionPath | `open fun getExecutionPath(commands: List<AuthenticatedObject<C>>): List<Clause<*, *, *>>` Determine the subclauses which will be verified as a result of verifying this clause.
groupStates | `abstract fun groupStates(tx: TransactionForContract): List<InOutGroup<S, K>>`
verify | `open fun verify(tx: TransactionForContract, inputs: List<ContractState>, outputs: List<ContractState>, commands: List<AuthenticatedObject<C>>, groupingKey: Unit?): Set<C>` Verify the transaction matches the conditions from this clause. For example, a "no zero amount output" clause would check each of the output states that it applies to, looking for a zero amount, and throw IllegalStateException if any matched.

### Extension Functions

matches | `fun <C : CommandData> Clause<*, C, *>.matches(commands: List<AuthenticatedObject<C>>): Boolean` Determine if the given list of commands matches the required commands for a clause to trigger.

### Inheritors

Group | `class Group : GroupClauseVerifier<State, Commands, Issued<Currency>>`
Group | `class Group : GroupClauseVerifier<State, Commands, Issued<Commodity>>` Grouping clause to extract input and output states into matched groups and then run a set of clauses over each group.
Group | `class Group<P> : GroupClauseVerifier<State<P>, Commands, Issued<Terms<P>>>` Parent clause for clauses that operate on grouped states (those which are fungible).
Group | `class Group : GroupClauseVerifier<State, Commands, Issued<Terms>>`