docs/net.corda.core.contracts/UpgradedContractWithLegacyConstraint

UpgradedContractWithLegacyConstraint

interface UpgradedContractWithLegacyConstraint<in OldState : ContractState, out NewState : ContractState> : UpgradedContract<OldState, NewState>

This interface allows specifying a custom legacy contract constraint for upgraded contracts. The default for UpgradedContract is WhitelistedByZoneAttachmentConstraint.

Properties

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abstract val legacyContract: ContractClassName

Name of the contract this is an upgraded version of, used as part of verification of upgrade transactions.

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abstract val legacyContractConstraint: AttachmentConstraint

A validator for the legacy (pre-upgrade) contract attachments on the transaction.

Functions

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abstract fun upgrade(state: OldState): NewState

Upgrade contract's state object to a new state object.

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abstract fun verify(tx: LedgerTransaction)

Takes an object that represents a state transition, and ensures the inputs/outputs/commands make sense. Must throw an exception if there's a problem that should prevent state transition. Takes a single object rather than an argument so that additional data can be added without breaking binary compatibility with existing contract code.