Add missing Javadocs

src/main/java/org/jfree/data/KeyedValuesItemKey.java

@@ -39,6 +39,9 @@
 import java.io.Serializable;
 import org.jfree.chart.util.Args;
 
+/**
+ * A reference to a specific item in a {@link KeyedValues} data structure.
+ */
 public class KeyedValuesItemKey implements ItemKey, Serializable {
 
     /** The key for the item. */

src/main/java/org/jfree/data/time/TimeSeries.java

@@ -344,7 +344,23 @@ public Range findValueRange(Range xRange, TimePeriodAnchor xAnchor,
         return findValueRange(xRange, xAnchor, calendar);
     }
 
-    public Range findValueRange(Range xRange, TimePeriodAnchor xAnchor, Calendar calendar) {
+    /**
+     * Finds the range of y-values that fall within the specified range of
+     * x-values (where the x-values are interpreted as milliseconds since the
+     * epoch and converted to time periods using the specified calendar).
+     * 
+     * @param xRange  the subset of x-values to use ({@code null} not
+     *     permitted).
+     * @param xAnchor  the anchor point for the x-values ({@code null}
+     *     not permitted).
+     * @param calendar  the calendar ({@code null} not permitted).
+     * 
+     * @return The range of y-values.
+     * 
+     * @since 1.0.18
+     */
+    public Range findValueRange(Range xRange, TimePeriodAnchor xAnchor, 
+            Calendar calendar) {
         // since the items are ordered, we could be more clever here and avoid
         // iterating over all the data
         double lowY = Double.POSITIVE_INFINITY;