reflect ecCodes bugfix [ECC-1197] in version v2.21.0: headline extraction with spaces not commas

[ECC-1197] - grib_get_data: Words on the first line should be separated by spaces not commas
see https://jira.ecmwf.int/browse/ECC-1197 for details

Author: johanneshiry

build.gradle

@@ -23,7 +23,7 @@ ext {
 }
 
 group = 'com.github.ie3-institute'
-version = '0.4.5'
+version = '0.4.6'
 description = 'DWDWeatherTools'
 defaultTasks 'build'
 sourceCompatibility = javaVersion

src/main/java/edu/ie3/tools/Extractor.java

@@ -42,11 +42,21 @@ public Extractor(
     formattedTimestep = Converter.getFormattedTimestep(file);
   }
 
+  private boolean validHeadline(String headlineString) {
+    // since eccodes v2.21.0 the data extraction expects a headline w/o commas but with whitespaces
+    // see ECC-1197 - https://jira.ecmwf.int/browse/ECC-1197
+    String headline = "Latitude Longitude Value";
+    String oldHeadline = "Latitude, Longitude, Value";
+
+    return headlineString != null
+        && (headlineString.trim().equals(headline) || headlineString.trim().equals(oldHeadline));
+  }
+
   protected HashMap<CoordinateModel, Double> parse(BufferedReader reader) throws IOException {
     HashMap<CoordinateModel, Double> coordinateToValue = new HashMap<>(720729);
     try {
       String line = reader.readLine();
-      if (line == null || !line.trim().equals("Latitude, Longitude, Value")) {
+      if (!validHeadline(line)) {
         throw new IOException("Unexpected start of file: " + line);
       }
       while ((line = reader.readLine()) != null) {

src/test/java/edu/ie3/tools/ExtractorTest.java

@@ -27,7 +27,7 @@
 
 public class ExtractorTest {
 
-  private static String resourcesPath =
+  private static final String resourcesPath =
       System.getProperty("user.dir")
           + File.separator
           + "src"
@@ -36,7 +36,7 @@ public class ExtractorTest {
           + File.separator
           + "resources"
           + File.separator;
-  private static String extractorPath = resourcesPath + "extractorFiles";
+  private static final String extractorPath = resourcesPath + "extractorFiles";
 
   private final FileModel dummyFileModel = new FileModel(ZonedDateTime.now(), 1, Parameter.ASOB_S);