corda / net.corda.core.transactions / LedgerTransaction

LedgerTransaction

class LedgerTransaction : FullTransaction

A LedgerTransaction is derived from a WireTransaction. It is the result of doing the following operations:

Downloading and locally storing all the dependencies of the transaction.
Resolving the input states and loading them into memory.
Doing some basic key lookups on the Commands to see if any keys are from a recognised party, thus converting the Command objects into CommandWithParties.
Deserialising the output states.

All the above refer to inputs using a (txhash, output index) pair.

Usage notes:

LedgerTransaction is an abstraction that is meant to be used during the transaction verification stage. It needs full access to input states that might be in transactions that are encrypted and unavailable for code running outside the secure enclave. Also, it might need to deserialize states with code that might not be available on the classpath.

Because of this, trying to create or use a LedgerTransaction for any other purpose then transaction verification can result in unexpected exceptions, which need de be handled.

LedgerTransactions should never be instantiated directly from client code, but rather via WireTransaction.toLedgerTransaction

Types

InOutGroup

A set of related inputs and outputs that are connected by some common attributes. An InOutGroup is calculated using groupStates and is useful for handling cases where a transaction may contain similar but unrelated state evolutions, for example, a transaction that moves cash in two different currencies. The numbers must add up on both sides of the transaction, but the values must be summed independently per currency. Grouping can be used to simplify this logic.

data class InOutGroup<out T : ContractState, out K : Any>

Constructors

<init>

LedgerTransaction(inputs: List<StateAndRef<ContractState>>, outputs: List<TransactionState<ContractState>>, commands: List<CommandWithParties<CommandData>>, attachments: List<Attachment>, id: SecureHash, notary: Party?, timeWindow: TimeWindow?, privacySalt: PrivacySalt)

LedgerTransaction(inputs: List<StateAndRef<ContractState>>, outputs: List<TransactionState<ContractState>>, commands: List<CommandWithParties<CommandData>>, attachments: List<Attachment>, id: SecureHash, notary: Party?, timeWindow: TimeWindow?, privacySalt: PrivacySalt, networkParameters: NetworkParameters)

Properties

attachments	A list of Attachment objects identified by the transaction that are needed for this transaction to verify. `val attachments: List<Attachment>`
commands	Arbitrary data passed to the program of each input state. `val commands: List<CommandWithParties<CommandData>>`
digestService	`val digestService: DigestService`
id	The hash of the original serialised WireTransaction. `val id: SecureHash`
inputs	The resolved input states which will be consumed/invalidated by the execution of this transaction. `val inputs: List<StateAndRef<ContractState>>`
inputStates	`val inputStates: List<ContractState>`
networkParameters	Network parameters that were in force when the transaction was constructed. This is nullable only for backwards compatibility for serialized transactions. In reality this field will always be set when on the normal codepaths. `val networkParameters: NetworkParameters?`
notary	The notary that the tx uses, this must be the same as the notary of all the inputs, or null if there are no inputs. `val notary: Party?`
outputs	The outputs created by the transaction. `val outputs: List<TransactionState<ContractState>>`
privacySalt	Random data used to make the transaction hash unpredictable even if the contents can be predicted; needed to avoid some obscure attacks. `val privacySalt: PrivacySalt`
references	Referenced states, which are like inputs but won't be consumed. `val references: List<StateAndRef<ContractState>>`
referenceStates	`val referenceStates: List<ContractState>`
timeWindow	The time window within which the tx is valid, will be checked against notary pool member clocks. `val timeWindow: TimeWindow?`

Functions

commandsOfType	Helper to simplify getting all Command items with a CommandData of a particular class, interface, or base class. `fun <T : CommandData> commandsOfType(clazz: Class<T>): List<Command<T>>fun <T : CommandData> commandsOfType(): List<Command<T>>`
component1	`operator fun component1(): List<StateAndRef<ContractState>>`
component10	`operator fun component10(): List<StateAndRef<ContractState>>`
component2	`operator fun component2(): List<TransactionState<ContractState>>`
component3	`operator fun component3(): List<CommandWithParties<CommandData>>`
component4	`operator fun component4(): List<Attachment>`
component5	`operator fun component5(): SecureHash`
component6	`operator fun component6(): Party?`
component7	`operator fun component7(): TimeWindow?`
component8	`operator fun component8(): PrivacySalt`
component9	`operator fun component9(): NetworkParameters?`
copy	`fun copy(inputs: List<StateAndRef<ContractState>>, outputs: List<TransactionState<ContractState>>, commands: List<CommandWithParties<CommandData>>, attachments: List<Attachment>, id: SecureHash, notary: Party?, timeWindow: TimeWindow?, privacySalt: PrivacySalt): LedgerTransaction` `fun copy(inputs: List<StateAndRef<ContractState>> = this.inputs, outputs: List<TransactionState<ContractState>> = this.outputs, commands: List<CommandWithParties<CommandData>> = this.commands, attachments: List<Attachment> = this.attachments, id: SecureHash = this.id, notary: Party? = this.notary, timeWindow: TimeWindow? = this.timeWindow, privacySalt: PrivacySalt = this.privacySalt, networkParameters: NetworkParameters? = this.networkParameters): LedgerTransaction`
equals	`fun equals(other: Any?): Boolean`
filterCommands	Helper to simplify filtering Command items according to a Predicate. `fun <T : CommandData> filterCommands(clazz: Class<T>, predicate: Predicate<T>): List<Command<T>>fun <T : CommandData> filterCommands(predicate: (T) -> Boolean): List<Command<T>>`
filterInputs	Helper to simplify filtering inputs according to a Predicate. `fun <T : ContractState> filterInputs(clazz: Class<T>, predicate: Predicate<T>): List<T>fun <T : ContractState> filterInputs(predicate: (T) -> Boolean): List<T>`
filterInRefs	Helper to simplify filtering inputs according to a Predicate. `fun <T : ContractState> filterInRefs(clazz: Class<T>, predicate: Predicate<T>): List<StateAndRef<T>>fun <T : ContractState> filterInRefs(predicate: (T) -> Boolean): List<StateAndRef<T>>`
filterReferenceInputRefs	Helper to simplify filtering reference inputs according to a Predicate. `fun <T : ContractState> filterReferenceInputRefs(clazz: Class<T>, predicate: Predicate<T>): List<StateAndRef<T>>fun <T : ContractState> filterReferenceInputRefs(predicate: (T) -> Boolean): List<StateAndRef<T>>`
filterReferenceInputs	Helper to simplify filtering reference inputs according to a Predicate. `fun <T : ContractState> filterReferenceInputs(clazz: Class<T>, predicate: Predicate<T>): List<T>fun <T : ContractState> filterReferenceInputs(predicate: (T) -> Boolean): List<T>`
findCommand	Helper to simplify finding a single Command items according to a Predicate. `fun <T : CommandData> findCommand(clazz: Class<T>, predicate: Predicate<T>): Command<T>fun <T : CommandData> findCommand(predicate: (T) -> Boolean): Command<T>`
findInput	Helper to simplify finding a single input ContractState matching a Predicate. `fun <T : ContractState> findInput(clazz: Class<T>, predicate: Predicate<T>): Tfun <T : ContractState> findInput(predicate: (T) -> Boolean): T`
findInRef	Helper to simplify finding a single input matching a Predicate. `fun <T : ContractState> findInRef(clazz: Class<T>, predicate: Predicate<T>): StateAndRef<T>fun <T : ContractState> findInRef(predicate: (T) -> Boolean): StateAndRef<T>`
findReference	Helper to simplify finding a single reference inputs ContractState matching a Predicate. `fun <T : ContractState> findReference(clazz: Class<T>, predicate: Predicate<T>): Tfun <T : ContractState> findReference(predicate: (T) -> Boolean): T`
findReferenceInputRef	Helper to simplify finding a single reference input matching a Predicate. `fun <T : ContractState> findReferenceInputRef(clazz: Class<T>, predicate: Predicate<T>): StateAndRef<T>fun <T : ContractState> findReferenceInputRef(predicate: (T) -> Boolean): StateAndRef<T>`
getAttachment	Helper to simplify getting an indexed attachment. `fun getAttachment(index: Int): Attachment` `fun getAttachment(id: SecureHash): Attachment`
getCommand	Helper to simplify getting an indexed command. `fun <T : CommandData> getCommand(index: Int): Command<T>`
getInput	Helper to simplify getting an indexed input ContractState. `fun getInput(index: Int): ContractState`
getReferenceInput	Helper to simplify getting an indexed reference input ContractState. `fun getReferenceInput(index: Int): ContractState`
groupStates	Given a type and a function that returns a grouping key, associates inputs and outputs together so that they can be processed as one. The grouping key is any arbitrary object that can act as a map key (so must implement equals and hashCode). `fun <T : ContractState, K : Any> groupStates(ofType: Class<T>, selector: (T) -> K): List<InOutGroup<T, K>>` See the documentation for the reflection-based version of groupStates `fun <T : ContractState, K : Any> groupStates(selector: (T) -> K): List<InOutGroup<T, K>>`
hashCode	`fun hashCode(): Int`
inputsOfType	Helper to simplify getting all inputs states of a particular class, interface, or base class. `fun <T : ContractState> inputsOfType(clazz: Class<T>): List<T>fun <T : ContractState> inputsOfType(): List<T>`
inRef	Returns the typed input StateAndRef at the specified index `fun <T : ContractState> inRef(index: Int): StateAndRef<T>`
inRefsOfType	Helper to simplify getting all inputs states of a particular class, interface, or base class. `fun <T : ContractState> inRefsOfType(clazz: Class<T>): List<StateAndRef<T>>fun <T : ContractState> inRefsOfType(): List<StateAndRef<T>>`
referenceInputRefsOfType	Helper to simplify getting all reference input states of a particular class, interface, or base class. `fun <T : ContractState> referenceInputRefsOfType(clazz: Class<T>): List<StateAndRef<T>>fun <T : ContractState> referenceInputRefsOfType(): List<StateAndRef<T>>`
referenceInputsOfType	Helper to simplify getting all reference input states of a particular class, interface, or base class. `fun <T : ContractState> referenceInputsOfType(clazz: Class<T>): List<T>fun <T : ContractState> referenceInputsOfType(): List<T>`
specialise	We need a way to customise transaction verification inside the Node without changing either the wire format or any public APIs. `fun specialise(alternateVerifier: (LedgerTransaction, SerializationContext) -> Verifier): LedgerTransaction`
toString	`fun toString(): String`
transform	Pass all of this LedgerTransaction object's serialized state to a transformer function. `fun <T> transform(transformer: (List<ComponentGroup>, List<SerializedStateAndRef>, List<SerializedStateAndRef>) -> T): T`
verify	Verifies this transaction and runs contract code. At this stage it is assumed that signatures have already been verified. `fun verify(): Unit`

Companion Object Functions

createForContractVerify

This factory function will create an instance of LedgerTransaction that will be used for contract verification. See BasicVerifier and DeterministicVerifier.

fun createForContractVerify(inputs: List<StateAndRef<ContractState>>, outputs: List<TransactionState<ContractState>>, commands: List<CommandWithParties<CommandData>>, attachments: List<Attachment>, id: SecureHash, notary: Party?, timeWindow: TimeWindow?, privacySalt: PrivacySalt, networkParameters: NetworkParameters?, references: List<StateAndRef<ContractState>>, digestService: DigestService): LedgerTransaction