ENH: Add functionality for reading cusom namespaces from a file

src/main/Config.kt

@@ -0,0 +1,30 @@
+package com.github.statnett.loadflowservice
+
+import io.github.oshai.kotlinlogging.KotlinLogging
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.jsonObject
+import java.io.File
+
+private val logger = KotlinLogging.logger {}
+
+class Environment {
+    companion object {
+        var namespaceFile: String? = System.getenv("NAMESPACE_FILE")
+    }
+}
+
+class Config {
+    companion object {
+        var namespaces: Map<String, String> = loadNamespaces(Environment.namespaceFile)
+    }
+}
+
+fun loadNamespaces(filename: String?): Map<String, String> {
+    if (filename == null) {
+        return mapOf()
+    }
+
+    val namespaceFile = File(filename)
+    val jsonString = namespaceFile.readText()
+    return Json.parseToJsonElement(jsonString).jsonObject.mapValues { item -> item.value.toString().replace("\"", "") }
+}

src/main/ExternalTripleStore.kt

@@ -10,8 +10,11 @@ data class ParsedSparqlQuery(
 fun parseQuery(sparqlQueryResource: String): ParsedSparqlQuery {
     val catalog = QueryCatalog(sparqlQueryResource)
 
+    val namespaces: MutableMap<String, String> = mutableMapOf()
+    namespaces.putAll(Config.namespaces)
+    namespaces.putAll(extractPrefixes(catalog))
     return ParsedSparqlQuery(
-        extractPrefixes(catalog),
+        namespaces,
         extractPredicates(catalog),
     )
 }

src/test/TestConfig.kt

@@ -0,0 +1,25 @@
+import com.github.statnett.loadflowservice.loadNamespaces
+import org.junit.jupiter.api.Test
+import java.io.File
+import kotlin.test.assertEquals
+
+class TestConfig {
+    @Test
+    fun `test load namespaces from file`() {
+        val filename = "temp_namespaces"
+        val jsonString = "{\"cim\":\"c\",\"md\":\"m\"}"
+
+        val file = File.createTempFile(filename, "json")
+        file.deleteOnExit()
+        file.writeText(jsonString)
+
+        val result = loadNamespaces(file.path)
+
+        assertEquals(mapOf("cim" to "c", "md" to "m"), result)
+    }
+
+    @Test
+    fun `test load namespaces null`() {
+        assertEquals(loadNamespaces(null), mapOf())
+    }
+}