com.r3corda.core.contracts.clauses / GroupClauseVerifier

# GroupClauseVerifier

`abstract class GroupClauseVerifier<S : ContractState, T : Any> : SingleClause`

### Constructors

<init> | `GroupClauseVerifier()`

### Properties

clauses | `abstract val clauses: List<GroupClause<S, T>>`
requiredCommands | `open val requiredCommands: Set<Class<out CommandData>>` Classes for commands which must ALL be present in transaction for this clause to be triggered

### Functions

extractGroups | `abstract fun extractGroups(tx: TransactionForContract): List<InOutGroup<S, T>>`
verify | `open fun verify(tx: TransactionForContract, commands: Collection<AuthenticatedObject<CommandData>>): Set<CommandData>` 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.

### Inheritors

Group | `class Group : GroupClauseVerifier<State, Issued<Currency>>`
Group | `class Group<P> : GroupClauseVerifier<State<P>, Issued<Terms<P>>>` Parent clause for clauses that operate on grouped states (those which are fungible).
Group | `class Group : GroupClauseVerifier<State, Issued<Terms>>`
Group | `class Group : GroupClauseVerifier<State, String>`