Bug/jar resource handling 49

This update/bugfix replaces old calls to local files with an approach that allows to load the resource from jar as input stream or temporarily export it to local file system in cases where a File object is strictly needed (e.g. LibLouis Translator tables).

src/integrationTest/java/PrintableDataExporterIntegTest.java

@@ -14,10 +14,10 @@ import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 
 import javax.print.DocFlavor;
-import java.io.File;
 import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.net.URL;
 
 /**
  * Integrationtests for the components PrintableData and Exporter.
@@ -45,8 +45,8 @@ public class PrintableDataExporterIntegTest {
     @BeforeAll
     public static void setUp() {
         Assertions.assertDoesNotThrow(() -> {
-            String correct = getResource("config/correct.properties").getAbsolutePath();
-            String standard = getResource("config/default.properties").getAbsolutePath();
+            URL correct = ClassLoader.getSystemClassLoader().getResource("config/correct.properties");
+            URL standard = ClassLoader.getSystemClassLoader().getResource("config/default.properties");
             JavaPropertiesConfigurationParser configParser = new JavaPropertiesConfigurationParser(correct, standard);
             printer = configParser.getPrinter();
             printer.getProperty("brailletable").toString();
@@ -55,11 +55,6 @@ public class PrintableDataExporterIntegTest {
         });
     }
 
-    public static File getResource(String fileName) {
-        ClassLoader classLoader = ClassLoader.getSystemClassLoader();
-        File resourceFile = new File(classLoader.getResource(fileName).getFile());
-        return resourceFile;
-    }
     /**
      * Unittest/Integrationtest for the private Print method with a Null Servive.
      * Expected: Nullpointerexception.