fix checkstyle warnings

src/main/java/org/orekit/rugged/los/FixedRotation.java

@@ -73,14 +73,14 @@ public class FixedRotation implements TimeIndependentLOSTransform {
         this.angleDriver = new ParameterDriver(name, angle, SCALE, -2 * FastMath.PI, 2 * FastMath.PI);
         angleDriver.addObserver(new ParameterObserver() {
             @Override
-            public void valueChanged(final double previousValue, final ParameterDriver driver, AbsoluteDate date) {
+            public void valueChanged(final double previousValue, final ParameterDriver driver, final AbsoluteDate date) {
                 // reset rotations to null, they will be evaluated lazily if needed
                 rotation = null;
                 rDS      = null;
             }
-            
+
             @Override
-            public void valueSpanMapChanged​(TimeSpanMap<Double> previousValueSpanMap, ParameterDriver driver) {
+            public void valueSpanMapChanged​(final TimeSpanMap<Double> previousValueSpanMap, final ParameterDriver driver) {
                 // reset rotations to null, they will be evaluated lazily if needed
                 rotation = null;
                 rDS      = null;

src/main/java/org/orekit/rugged/los/FixedZHomothety.java

@@ -67,14 +67,14 @@ public class FixedZHomothety implements TimeIndependentLOSTransform {
         this.factorDriver = new ParameterDriver(name, factorvalue, SCALE, 0, Double.POSITIVE_INFINITY);
         factorDriver.addObserver(new ParameterObserver() {
             @Override
-            public void valueChanged(final double previousValue, final ParameterDriver driver, AbsoluteDate date) {
+            public void valueChanged(final double previousValue, final ParameterDriver driver, final AbsoluteDate date) {
                 // reset factor to zero, they will be evaluated lazily if needed
                 factor = 0.0;
                 factorDS = null;
             }
-            
+
             @Override
-            public void valueSpanMapChanged​(TimeSpanMap<Double> previousValueSpanMap, ParameterDriver driver) {
+            public void valueSpanMapChanged​(final TimeSpanMap<Double> previousValueSpanMap, final ParameterDriver driver) {
                 // reset factor to zero, they will be evaluated lazily if needed
                 factor = 0.0;
                 factorDS = null;

src/main/java/org/orekit/rugged/los/LOSBuilder.java

@@ -227,13 +227,13 @@ public class LOSBuilder {
             final ParameterObserver resettingObserver = new ParameterObserver() {
                 /** {@inheritDoc} */
                 @Override
-                public void valueChanged(final double previousValue, final ParameterDriver driver, AbsoluteDate date) {
+                public void valueChanged(final double previousValue, final ParameterDriver driver, final AbsoluteDate date) {
                     Arrays.fill(transformed, null);
                 }
-                
+
                 /** {@inheritDoc} */
                 @Override
-                public void valueSpanMapChanged​(TimeSpanMap<Double> previousValueSpanMap, ParameterDriver driver) {
+                public void valueSpanMapChanged​(final TimeSpanMap<Double> previousValueSpanMap, final ParameterDriver driver) {
                     Arrays.fill(transformed, null);
                 }
             };

src/main/java/org/orekit/rugged/los/PolynomialRotation.java

@@ -88,15 +88,15 @@ public class PolynomialRotation implements LOSTransform {
         this.coefficientsDrivers = new ParameterDriver[angleCoeffs.length];
         final ParameterObserver resettingObserver = new ParameterObserver() {
             @Override
-            public void valueChanged(final double previousValue, final ParameterDriver driver, AbsoluteDate date) {
+            public void valueChanged(final double previousValue, final ParameterDriver driver, final AbsoluteDate date) {
                 // reset rotations to null, they will be evaluated lazily if needed
                 angle   = null;
                 axisDS  = null;
                 angleDS = null;
             }
-            
+
             @Override
-            public void valueSpanMapChanged​(TimeSpanMap<Double> previousValueSpanMap, ParameterDriver driver) {
+            public void valueSpanMapChanged​(final TimeSpanMap<Double> previousValueSpanMap, final ParameterDriver driver) {
                 // reset rotations to null, they will be evaluated lazily if needed
                 angle   = null;
                 axisDS  = null;

src/main/java/org/orekit/rugged/utils/SpacecraftToObservedBody.java

@@ -129,11 +129,11 @@ public class SpacecraftToObservedBody implements Serializable {
         // set up the TimeStampedPVCoordinates interpolator
         final TimeInterpolator<TimeStampedPVCoordinates> pvInterpolator =
                 new TimeStampedPVCoordinatesHermiteInterpolator(pvInterpolationNumber, pvFilter);
-        
+
         // set up the cache for attitudes
         final TimeStampedCache<TimeStampedAngularCoordinates> aCache =
                 new ImmutableTimeStampedCache<>(aInterpolationNumber, quaternions);
-        
+
         // set up the TimeStampedAngularCoordinates Hermite interpolator
         final TimeInterpolator<TimeStampedAngularCoordinates> angularInterpolator =
                 new TimeStampedAngularCoordinatesHermiteInterpolator(aInterpolationNumber, aFilter);
@@ -155,7 +155,7 @@ public class SpacecraftToObservedBody implements Serializable {
                 pvInterpolationDate = date;
             }
             final TimeStampedPVCoordinates interpolatedPV =
-                    pvInterpolator.interpolate(pvInterpolationDate, 
+                    pvInterpolator.interpolate(pvInterpolationDate,
                             pvCache.getNeighbors(pvInterpolationDate));
             final TimeStampedPVCoordinates pv = interpolatedPV.shiftedBy(date.durationFrom(pvInterpolationDate));
 
@@ -169,7 +169,7 @@ public class SpacecraftToObservedBody implements Serializable {
                 aInterpolationDate = date;
             }
             final TimeStampedAngularCoordinates interpolatedQuaternion =
-                    angularInterpolator.interpolate(aInterpolationDate, 
+                    angularInterpolator.interpolate(aInterpolationDate,
                             aCache.getNeighbors(aInterpolationDate).collect(Collectors.toList()));
             final TimeStampedAngularCoordinates quaternion = interpolatedQuaternion.shiftedBy(date.durationFrom(aInterpolationDate));