Sonarlint: closing files

src/main/java/eu/simstadt/geo/RegionChooserUtils.java

@@ -21,6 +21,7 @@
 	private static final CRSFactory CRS_FACTORY = new CRSFactory();
 	public static final CoordinateReferenceSystem WGS84 = CRS_FACTORY.createFromName("EPSG:4326");
 	private static final Pattern srsNamePattern = Pattern.compile("(?i)(?<=srsName=[\"'])[^\"']+(?=[\"'])");
+	private static final int CITYGML_HEADER_LENGTH = 50;
 
 	private RegionChooserUtils() {
 		// only static use
@@ -41,7 +42,7 @@ private RegionChooserUtils() {
 	 * @param srsName
 	 * @return CoordinateReferenceSystem
 	 */
-	public static CoordinateReferenceSystem crsFromSrsName(String srsName) {
+	private static CoordinateReferenceSystem crsFromSrsName(String srsName) {
 		// EPSG:31467
 		Pattern pEPSG = Pattern.compile("^(EPSG:\\d+)$");
 		Matcher mEPSG = pEPSG.matcher(srsName);
@@ -116,7 +117,8 @@ public static Polygon changePolygonCRS(Polygon polygonInOriginalCRS, CoordinateR
 	 * @throws IOException
 	 */
 	public static CoordinateReferenceSystem crsFromCityGMLHeader(Path citygmlPath) throws IOException {
-		Optional<String> line = Files.lines(citygmlPath).limit(50).filter(srsNamePattern.asPredicate()).findFirst();
+		try (Stream<String> lines = Files.lines(citygmlPath).limit(CITYGML_HEADER_LENGTH)) {
+			Optional<String> line = lines.filter(srsNamePattern.asPredicate()).findFirst();
 			if (line.isPresent()) {
 				Matcher matcher = srsNamePattern.matcher(line.get());
 				matcher.find();
@@ -125,6 +127,7 @@ public static CoordinateReferenceSystem crsFromCityGMLHeader(Path citygmlPath) t
 				throw new IllegalArgumentException("No srsName found in the header of " + citygmlPath);
 			}
 		}
+	}
 
 	/**
 	 * Finds every CityGML in every .proj folder in a repository.