feat(connector): add VDM type data class for Switch

connector/shared/src/commonMain/kotlin/io/anthonyberg/connector/shared/vdmj/type/Aircraft.kt

@@ -4,7 +4,7 @@ package io.anthonyberg.connector.shared.vdmj.type
  * Aircraft record type in the VDM-SL model
  */
 data class Aircraft(
-    val items: Map<String, String>, // TODO value should be ItemObject type
+    val items: Map<String, Switch>, // TODO value should be ItemObject type
     val procedure: MutableList<String> // TODO change String to a ProcedureItem type
 ) {
     /**
@@ -33,8 +33,7 @@ data class Aircraft(
         for (dref: String in items.keys) {
             val value = items.getValue(dref)
 
-            // TODO make sure to run toString on value once items Map changes the value type
-            output += "\"$dref\" |-> $value,"
+            output += "\"$dref\" |-> ${value.toVDMString()},"
         }
 
         // Removes the last comma in the VDM map as it will error otherwise

connector/shared/src/commonMain/kotlin/io/anthonyberg/connector/shared/vdmj/type/Switch.kt

@@ -0,0 +1,46 @@
+package io.anthonyberg.connector.shared.vdmj.type
+
+/**
+ * Switch record type in VDM-SL
+ *
+ * @param position Position of the switch
+ * @param middlePosition `true` if there is a middle position for the switch,
+ * `false` if the switch only has 2 positions
+ */
+data class Switch(val position: Int, val middlePosition: Boolean = false) {
+    init {
+        require((position >= 0) and ((position <= 1) and !middlePosition) or ((position <= 2) and middlePosition))
+    }
+
+    /**
+     * Converts to String for a VDM representation of an ItemObject record
+     *
+     * @return String representation for VDM ItemObject
+     */
+    fun toVDMString(): String {
+        return "mk_ItemObject(<SWITCH>, ${toSwitchVDMString()})"
+    }
+
+    /**
+     * Converts to String for a VDM representation of a Switch record
+     *
+     * @return String representation for VDM Switch
+     */
+    private fun toSwitchVDMString(): String {
+        return "mk_Switch(${getSwitchState()}, $middlePosition)"
+    }
+
+    /**
+     * Gets the VDM object for the switch state
+     *
+     * @return String representation for switch state
+     */
+    private fun getSwitchState(): String {
+        return when (position) {
+            0 -> "<OFF>"
+            1 -> if (middlePosition) "<MIDDLE>" else "<ON>"
+            2 -> "<ON>"
+            else -> throw IllegalArgumentException("Position must be between 0 and 2")
+        }
+    }
+}