Cleanup code

Author: hannesa2

MPChartLib/src/main/java/com/github/mikephil/charting/components/LimitLine.java

@@ -16,7 +16,7 @@
 public class LimitLine extends ComponentBase {
 
     /** limit / maximum (the y-value or xIndex) */
-    private float mLimit;
+    private final float mLimit;
 
     /** the width of the limit line */
     private float mLineWidth = 2f;
@@ -130,7 +130,7 @@ public void disableDashedLine() {
      * disabled
      */
     public boolean isDashedLineEnabled() {
-        return mDashPathEffect == null ? false : true;
+        return mDashPathEffect != null;
     }
 
     /**

MPChartLib/src/main/java/com/github/mikephil/charting/components/LimitRange.java

@@ -39,7 +39,7 @@ public float getHigh() {
 	/**
 	 * limit / maximum (the y-value or xIndex)
 	 */
-	private Range mLimit;
+	private final Range mLimit;
 
 	/**
 	 * the width of the limit line
@@ -182,7 +182,7 @@ public void disableDashedLine() {
 	 * disabled
 	 */
 	public boolean isDashedLineEnabled() {
-		return mDashPathEffect == null ? false : true;
+		return mDashPathEffect != null;
 	}
 
 	/**

MPChartLib/src/main/java/com/github/mikephil/charting/data/DataSet.java

@@ -7,6 +7,8 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import androidx.annotation.NonNull;
+
 /**
  * The DataSet class represents one group or type of entries (Entry) in the
  * Chart that belong together. It is designed to logically separate different
@@ -254,7 +256,7 @@ public void clear() {
 	}
 
 	@Override
-	public boolean addEntry(T entry) {
+	public boolean addEntry(@NonNull T entry) {
 		List<T> values = getEntries();
 		if (values == null) {
 			values = new ArrayList<>();

MPChartLib/src/main/java/com/github/mikephil/charting/data/LineDataSet.java

@@ -226,7 +226,7 @@ public void disableDashedLine() {
 
 	@Override
 	public boolean isDashedLineEnabled() {
-		return mDashPathEffect == null ? false : true;
+		return mDashPathEffect != null;
 	}
 
 	@Override