Introduce new Run#getBuildsOverThreshold() method for getting runs above the desired execution result (#4259)

* IntelliJ/Java: Duplicate code

Refactored as Run.getBuildsOverThreshold

* CheckForNull

Co-Authored-By: Oleg Nenashev <o.v.nenashev@gmail.com>

* getBuildsOverThreshold: get RunT using _this()

Author: jsoref

core/src/main/java/hudson/model/Job.java

@@ -994,19 +994,8 @@ public RunT getLastCompletedBuild() {
      *   if not enough builds satisfying the threshold have been found. Never null.
      */
     public List<RunT> getLastBuildsOverThreshold(int numberOfBuilds, Result threshold) {
-        
-        List<RunT> result = new ArrayList<>(numberOfBuilds);
-        
         RunT r = getLastBuild();
-        while (r != null && result.size() < numberOfBuilds) {
-            if (!r.isBuilding() && 
-                 (r.getResult() != null && r.getResult().isBetterOrEqualTo(threshold))) {
-                result.add(r);
-            }
-            r = r.getPreviousBuild();
-        }
-        
-        return result;
+        return r.getBuildsOverThreshold(numberOfBuilds, threshold);
     }
 
     /**

core/src/main/java/hudson/model/Run.java

@@ -953,17 +953,32 @@ protected void dropLinks() {
      * @since 1.383
      */  
     public @Nonnull List<RunT> getPreviousBuildsOverThreshold(int numberOfBuilds, @Nonnull Result threshold) {
-        List<RunT> builds = new ArrayList<>(numberOfBuilds);
-        
         RunT r = getPreviousBuild();
+        return r.getBuildsOverThreshold(numberOfBuilds, threshold);
+    }
+
+    /**
+     * Returns the last {@code numberOfBuilds} builds with a build result ≥ {@code threshold}.
+     *
+     * @param numberOfBuilds the desired number of builds
+     * @param threshold the build result threshold
+     * @return a list with the builds (youngest build first).
+     *   May be smaller than 'numberOfBuilds' or even empty
+     *   if not enough builds satisfying the threshold have been found. Never null.
+     * @since TODO
+     */
+    protected @Nonnull List<RunT> getBuildsOverThreshold(int numberOfBuilds, @Nonnull Result threshold) {
+        List<RunT> builds = new ArrayList<>(numberOfBuilds);
+
+        RunT r = _this();
         while (r != null && builds.size() < numberOfBuilds) {
-            if (!r.isBuilding() && 
+            if (!r.isBuilding() &&
                  (r.getResult() != null && r.getResult().isBetterOrEqualTo(threshold))) {
                 builds.add(r);
             }
             r = r.getPreviousBuild();
         }
-        
+
         return builds;
     }