Added random operation

Author: paulorb

src/main/kotlin/PlcSimulation.kt

@@ -22,7 +22,7 @@ class PlcSimulation(
                             }
 
                             is Random -> {
-                                println("Random symbol ${element.symbol} valueMax ${element.valueMax} valueMin ${element.valueMin}")
+                                randomOperation(element, configuration, memory)
                             }
 
                             is Delay -> {

src/main/kotlin/operations/RandomOperation.kt

@@ -0,0 +1,47 @@
+package operations
+
+import AddressType
+import Configuration
+import PlcMemory
+import Random
+import java.util.concurrent.CancellationException
+
+
+fun randomOperation(element: Random, configuration: Configuration, memory: PlcMemory){
+    println("Random symbol ${element.symbol} value min ${element.valueMin} value max ${element.valueMax}")
+    var variable = configuration.registers.getVarConfiguration(element.symbol)
+    if (variable == null) {
+        println("ERROR: Symbol ${element.symbol} not found during Set execution")
+        throw CancellationException("Error - Random")
+    } else {
+        if(variable.addressType == AddressType.COIL || variable.addressType == AddressType.DISCRETE_INPUT){
+            println("ERROR: Symbol ${element.symbol} is of type COIL or DISCRETE_INPUT which is not support by Random operation")
+            throw CancellationException("Error - Random")
+        }
+
+        when (variable.addressType) {
+
+            AddressType.HOLDING_REGISTER -> {
+                //get the current value
+                //add
+                //set back the new value
+
+                if (variable.datatype == "FLOAT32") {
+                    val random: Float = element.valueMin.toFloat() + kotlin.random.Random.nextFloat() * (element.valueMax.toFloat() - element.valueMin.toFloat())
+                    setHoldingRegisterFloat32(random, memory, variable)
+                } else {
+                    val random: Int = element.valueMin.toInt() + kotlin.random.Random.nextInt() * (element.valueMax.toInt() - element.valueMin.toInt())
+                    setHoldingRegisterInt16(memory, variable, random.toShort())
+                }
+            }
+            AddressType.INPUT_REGISTER -> {
+                val random: Int = element.valueMin.toInt() + kotlin.random.Random.nextInt() * (element.valueMax.toInt() - element.valueMin.toInt())
+                memory.setInputRegister(variable.address.toInt(),random.toShort())
+            }
+
+            else -> {
+                throw CancellationException("Error - Random")
+            }
+        }
+    }
+}