docs/net.corda.core.contracts/HashAttachmentConstraint

HashAttachmentConstraint

data class HashAttachmentConstraint(val attachmentId: SecureHash) : AttachmentConstraint

An AttachmentConstraint that verifies by hash. The state protected by this constraint can only be used in a transaction created with that version of the jar. And a receiving node will only accept it if a cordapp with that hash has (is) been deployed on the node.

Constructors

constructor(attachmentId: SecureHash)

Types

Companion

object Companion

Properties

attachmentId

val attachmentId: SecureHash

Functions

canBeTransitionedFrom

fun AttachmentConstraint.canBeTransitionedFrom(input: AttachmentConstraint, attachment: ContractAttachment): Boolean

This method will be used in conjunction with NoConstraintPropagation. It is run during transaction verification when the contract is not annotated with NoConstraintPropagation. When constraints propagation is enabled, constraints set on output states need to follow certain rules with regards to constraints of input states.

isSatisfiedBy

open override fun isSatisfiedBy(attachment: Attachment): Boolean

Returns whether the given contract attachment can be used with the ContractState associated with this constraint object.