Fixes as per review comments by @chhsiao90

- Fixed javadoc typos
- Better constant name
- Simplification of LeanNode aggregation code

src/main/java/com/insightfullogic/honest_profiler/core/collector/lean/LeanLogCollector.java

@@ -31,7 +31,7 @@ public class LeanLogCollector implements LogEventListener, ProfileSource
 {
     // Class Properties
 
-    private static final long SECONDSTONANOS = 1000 * 1000 * 1000;
+    private static final long SECONDS_TO_NANOS = 1000 * 1000 * 1000;
 
     // Instance Properties
 
@@ -223,7 +223,7 @@ private void updateTime(long newSeconds, long newNanos)
             long secondsDiff = newSeconds - prevSeconds;
             long nanosDiff = newNanos - prevNanos;
 
-            nanosSpent = (secondsDiff * SECONDSTONANOS) + nanosDiff;
+            nanosSpent = (secondsDiff * SECONDS_TO_NANOS) + nanosDiff;
         }
 
         prevSeconds = newSeconds;

src/main/java/com/insightfullogic/honest_profiler/core/profiles/lean/LeanNode.java

@@ -57,24 +57,6 @@ protected LeanNode(FrameInfo frame, LeanNode parent)
         childMap = new HashMap<>();
     }
 
-    /**
-     * "Self constructor" for a LeanNode associated with the "bottom frame" of a stack trace, i.e. the one for which
-     * self time is recorded.
-     *
-     * @param frame the {@link FrameInfo} for this LeanNode
-     * @param nanos the self time associated with the frame
-     * @param parent the parent LeanNode
-     */
-    private LeanNode(FrameInfo frame, long nanos, LeanNode parent)
-    {
-        id = ID_GENERATOR.getAndIncrement();
-
-        this.frame = frame;
-        data = new NumericInfo(nanos);
-        this.parent = parent;
-        childMap = new HashMap<>();
-    }
-
     /**
      * Copy constructor.
      *
@@ -169,29 +151,19 @@ public boolean isThreadNode()
      *            {@link TraceStart} following it
      * @param child the child {@link FrameInfo} of the current LeanNode
      * @param last a boolean indicating if the child is the last in the stack trace sample
-     * @return this node
+     * @return the aggregated child {@link LeanNode}
      */
     public LeanNode add(long nanos, FrameInfo child, boolean last)
     {
         // Non-self add, which updates total time and sample count only.
         data.add(nanos, false);
 
-        return childMap.compute(
-            child,
-            (k, v) ->
-            // Create a new LeanNode if no children have been recorded for this FrameInfo
-            v == null ? (last ?
-            // New child is the last in stack, use "Self constructor".
-                new LeanNode(child, nanos, this)
-                // New child is not the last in stack, use "Non-self constructor".
-                : new LeanNode(child, this))
-                // Aggregate the information into an existing child
-                : (last ?
-                // Child is last in stack, use the "self add" on existing child
-                    v.addSelf(nanos) :
-                    // Child is not last in stack, return existing child (its "total" numbers will be updated when its
-                    // child is added)
-                    v));
+        LeanNode childNode = childMap.computeIfAbsent(child, k -> new LeanNode(k, this));
+        if (last)
+        {
+            childNode.addSelf(nanos);
+        }
+        return childNode;
     }
 
     /**

src/main/java/com/insightfullogic/honest_profiler/core/profiles/lean/info/NumericInfo.java

@@ -6,7 +6,6 @@
 
 import com.insightfullogic.honest_profiler.core.aggregation.result.Aggregation;
 import com.insightfullogic.honest_profiler.core.parser.StackFrame;
-import com.insightfullogic.honest_profiler.core.profiles.lean.LeanNode;
 
 /**
  * NumericInfo collects the four basic amounts tracked by the profiles and {@link Aggregation}s
@@ -43,17 +42,6 @@ public NumericInfo()
         this(ZERO, ZERO, 0, 0);
     }
 
-    /**
-     * Constructor for an item with self and total time known, used when creating a new {@link LeanNode}. Self and total
-     * time are set to the provided time, and self and total sample count are set to 1.
-     *
-     * @param selfNanos the self (and total) time
-     */
-    public NumericInfo(long selfNanos)
-    {
-        this(BigInteger.valueOf(selfNanos), BigInteger.valueOf(selfNanos), 1, 1);
-    }
-
     /**
      * Copy constructor.
      *