Parameters

A DSL has been provided for creating Parameters to store values like primitive types, collection types or domain specific types, to be used for ParameterSets in Events and Commands. This DSL is built over abstractions like Parameter, KeyType, etc. offered by CSW. Refer to the CSW docs for more information about this.

Keys

Following table lists all the key types, and their corresponding DSL.

KeyType	DSL
Boolean	booleanKey
Character	charKey
Byte	byteKey
Short	shortKey
Long	longKey
Int	intKey
Float	floatKey
Double	doubleKey
String	stringKey
UtcTime	utcTimeKey
TaiTime	taiTimeKey
ByteArray	byteArrayKey
ShortArray	shortArrayKey
LongArray	longArrayKey
IntArray	intArrayKey
FloatArray	floatArrayKey
DoubleArray	doubleArrayKey
ByteMatrix	byteMatrixKey
ShortMatrix	shortMatrixKey
LongMatrix	longMatrixKey
IntMatrix	intMatrixKey
FloatMatrix	floatMatrixKey
DoubleMatrix	doubleMatrixKey
Choice	choiceKey
EqCoord	eqCoordKey
SolarSystemCoord	solarSystemCoordKey
MinorPlanetCoord	minorPlanetCoordKey
CometCoord	cometCoordKey
AltAzCoord	altAzCoordKey
Coord (*)	coordKey

The example below shows usages of the DSL for different types of keys. Some other DSL helpers like choicesOf, arrayData, matrixData, etc. have also been provided for ease of access. Usage of this helper DSLs is also shown in the example below.

Kotlin

copysource// Primitive keys
val encoderKey: Key<Int> = intKey("encoder")
val flagKey: Key<Boolean> = booleanKey("flag")
val eventTimeKey: Key<UTCTime> = utcTimeKey("event-time")

// Arrays
val arrayKey: Key<ArrayData<Int>> = intArrayKey("arrayKey")
val elms: Array<Int> = arrayOf(1, 2, 3, 4)
val values1: ArrayData<Int> = arrayData(elms)
val values2: ArrayData<Int> = arrayData(5, 6, 7, 8)
val arrayParam: Parameter<ArrayData<Int>> = arrayKey.set(values1, values2)

// Matrix
val matrixKey: Key<MatrixData<Int>> = intMatrixKey("matrixKey")
val arr1: Array<Int> = arrayOf(1, 2, 3, 4)
val arr2: Array<Int> = arrayOf(5, 6, 7, 8)
val elms1: Array<Array<Int>> = arrayOf(arr1, arr2)
val data1: MatrixData<Int> = matrixData(elms1)
val data2: MatrixData<Int> = matrixData(arr1, arr2)
val matrixParameter: Parameter<MatrixData<Int>> = matrixKey.set(data1, data2)

// Domain specific types
val choiceKey: Key<Choice> = choiceKey("choice", choicesOf("A", "B", "C"))
val choiceParam: Parameter<Choice> = choiceKey.set(Choice("A"), Choice("C"))

// with units
val temperatureInKelvinKey: Key<Int> = intKey("encoder", JUnits.kelvin)

Creating Parameters

The example below shows different ways of creating parameters and adding them to a command.

Kotlin

copysourceval temperatureKey: Key<Int> = intKey("temperature")
val temperatureParam: Parameter<Int> = temperatureKey.set(1, 2, 3)

// with values as Array
val encoderKey: Key<Int> = intKey("encoder")
val encoderValues: Array<Int> = arrayOf(1, 2, 3)
val encoderParam: Parameter<Int> = encoderKey.setAll(encoderValues)

// with units
val powerKey: Key<Double> = doubleKey("power")
val values: Array<Double> = arrayOf(1.1, 2.2, 3.3)
val powerParam: Parameter<Double> = powerKey.setAll(values).withUnits(JUnits.watt)

// adding a param to command or event
val setupCommand: Setup = Setup("ESW.IRIS_darkNight", "move").add(temperatureParam)
val systemEvent: SystemEvent = SystemEvent("ESW.IRIS_darkNight", "movement").add(temperatureParam)

// adding multiple params
val setupCommand2: Setup = Setup("ESW.IRIS_darkNight", "move").madd(temperatureParam, encoderParam)

// adding params of one command to other
val paramsFromIncomingCommand: Params = command.params
val commandForDownstream: Setup = Setup("ESW.IRIS_darkNight", "move").add(paramsFromIncomingCommand)

Extracting a parameter from Params/Command/Event

Extracting parameter

You can extract a parameter from Params/Command/Event using another parameter with the same key name and key type (values of the parameter passed in are ignored).

Kotlin

copysourceval params: Params = setupCommand.params
val maybeParam: Parameter<Int>? = params.kFind(temperatureParam)
val maybeParam2: Parameter<Int>? = setupCommand.kFind(temperatureParam)

Extracting parameter by key

Yuo can also use a Key:

Kotlin

copysource// extracting a param from Params instance
val temperatureParameter: Parameter<Int>? = setupCommand.params.kGet(temperatureKey)
val temperatureParameter2: Parameter<Int> = (setupCommand.params)(temperatureKey) // alternative

// extracting a param directly from the command or event
val temperatureParameter3: Parameter<Int>? = setupCommand.kGet(temperatureKey)
val temperatureParameter4: Parameter<Int> = setupCommand(temperatureKey) // alternative

Extracting parameter by keyName and KeyType

Or, you can use the key name and type:

Kotlin

copysourceval keyName = "temperature"
val keyType: KeyType<Int> = JKeyType.IntKey()
val param: Parameter<Int>? = setupCommand.params.kGet(keyName, keyType)

Extracting values from a parameter

The example below shows the accessing a List of values or a specific value of a parameter.

Kotlin

copysourceval temperatureKey: Key<Int> = intKey("temperature")
val temperatureParam: Parameter<Int> = temperatureKey.set(1, 2, 3)

// extracting values from parameter
val temperatureValues: List<Int> = temperatureParam.values

// extracting first value from parameter
val firstValue: Int = temperatureParam.first

// extracting value of the parameter at a given index
val temperatureValue: Int? = temperatureParam.kGet(1)
val temperatureValue2: Int = temperatureParam(1) //alternative

Removing a parameter

A parameter could be removed from a Params instance or from a Command directly. The example below demonstrates both of these DSL methods.

Kotlin

copysource// remove param from params by key
val updatedParams: Params = setupCommand.params.remove(temperatureKey)

// remove param from params
val updatedParams2: Params = setupCommand.params.remove(temperatureParameter)

// remove param from command by key
val updatedCommand: Setup = setupCommand.remove(temperatureKey)

// remove param from command
val updatedCommand2: Setup = setupCommand.remove(temperatureParameter)

Checking if a parameter exists

Kotlin

copysource// check if parameter with specified key exists in Params
val temperatureKeyExists: Boolean = setupCommand.params.exists(temperatureKey)

// check if parameter with specified key exists directly from command
val temperatureKeyExists2: Boolean = setupCommand.exists(temperatureKey)