ch.epfl.dedis.calypso

Class WriteInstance

java.lang.Object

ch.epfl.dedis.calypso.WriteInstance

public class WriteInstance
extends Object

WriteInstance holds the data related to a spawnCalypsoWrite request. It is a representation of what is stored in ByzCoin. You can create it from an instanceID

Field Summary

Fields

Modifier and Type	Field and Description
static String	ContractId

Constructor Summary

Constructors

Constructor and Description
WriteInstance(CalypsoRPC calypso, DarcId darcBaseID, List<Signer> signers, List<Long> signerCtrs, WriteData wr) Constructor for creating a new instance.

Method Summary

Modifier and Type	Method and Description
static WriteInstance	fromCalypso(CalypsoRPC calypso, InstanceId writeId) Fetches an already existing writeInstance from Calypso and returns it.
DarcId	getDarcId()
Instance	getInstance() Get the instance.
CreateLTSReply	getLts() Get the LTS configuration.
WriteData	getWrite()
ReadInstance	spawnCalypsoRead(CalypsoRPC calypso, List<Signer> readers, List<Long> readerCtrs, Point Xc) Spawns a new CalypsoRead instance for this Write Instance.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ContractId

public static String ContractId

Constructor Detail

WriteInstance

public WriteInstance(CalypsoRPC calypso,
                     DarcId darcBaseID,
                     List<Signer> signers,
                     List<Long> signerCtrs,
                     WriteData wr)
              throws CothorityException

Constructor for creating a new instance.

Parameters:

calypso - The CalypsoRPC object which should be already running.

darcBaseID - The darc ID for which the signers belong.

signers - The list of signers that are authorized to create the instance.

signerCtrs - a list of monotonically increasing counter for every signer

wr - The WriteData object, to be stored in the instance.

Throws:

CothorityException - if something goes wrong

Method Detail

getLts

public CreateLTSReply getLts()

Get the LTS configuration.

Returns:

the LTS

getInstance

public Instance getInstance()

Get the instance.

Returns:

the Instance

getDarcId

public DarcId getDarcId()

getWrite

public WriteData getWrite()
                   throws CothorityNotFoundException

Returns:

the WriteData stored in that instance

Throws:

CothorityNotFoundException - if the instance does not hold a CalypsoWrite data

spawnCalypsoRead

public ReadInstance spawnCalypsoRead(CalypsoRPC calypso,
                                     List<Signer> readers,
                                     List<Long> readerCtrs,
                                     Point Xc)
                              throws CothorityException

Spawns a new CalypsoRead instance for this Write Instance.

Parameters:

calypso - an existing calypso object

readers - one or more readers that can sign the read spawn instruction

readerCtrs - a list of monotonically increasing counter for every reader

Xc - is the key to which the dataEnc will be re-encrypted to, it must not be one of the signers

Returns:

ReadInstance if successful

Throws:

CothorityException - if something goes wrong

fromCalypso

public static WriteInstance fromCalypso(CalypsoRPC calypso,
                                        InstanceId writeId)
                                 throws CothorityException

Fetches an already existing writeInstance from Calypso and returns it.

Parameters:

calypso - the Calypso instance

writeId - the write instance to load

Returns:

the new WriteInstance

Throws:

CothorityException - if something goes wrong