Refactor using Stream.reduce()

Author: sogoagain

src/main/java/org/apache/ibatis/executor/resultset/DefaultResultSetHandler.java

@@ -710,22 +710,21 @@ private Optional<Constructor<?>> findConstructorForAutomapping(final Class<?> re
     if (constructors.length == 1) {
       return Optional.of(constructors[0]);
     }
-    List<Constructor<?>> automapConstructors = Arrays.stream(constructors).filter(x -> x.isAnnotationPresent(AutomapConstructor.class)).toList();
-    if (automapConstructors.size() > 1) {
-      throw new ExecutorException("@AutomapConstructor should be used in only one constructor.");
-    }
-    if (automapConstructors.size() == 1) {
-      return Optional.of(automapConstructors.get(0));
-    }
-    if (configuration.isArgNameBasedConstructorAutoMapping()) {
-      // Finding-best-match type implementation is possible,
-      // but using @AutomapConstructor seems sufficient.
-      throw new ExecutorException(MessageFormat.format(
-          "'argNameBasedConstructorAutoMapping' is enabled and the class ''{0}'' has multiple constructors, so @AutomapConstructor must be added to one of the constructors.",
-          resultType.getName()));
-    } else {
-      return Arrays.stream(constructors).filter(x -> findUsableConstructorByArgTypes(x, rsw.getJdbcTypes())).findAny();
-    }
+    return Arrays.stream(constructors)
+      .filter(x -> x.isAnnotationPresent(AutomapConstructor.class))
+      .reduce((x, y) -> {
+        throw new ExecutorException("@AutomapConstructor should be used in only one constructor.");
+      }).or(() -> {
+        if (configuration.isArgNameBasedConstructorAutoMapping()) {
+          // Finding-best-match type implementation is possible,
+          // but using @AutomapConstructor seems sufficient.
+          throw new ExecutorException(MessageFormat.format(
+            "'argNameBasedConstructorAutoMapping' is enabled and the class ''{0}'' has multiple constructors, so @AutomapConstructor must be added to one of the constructors.",
+            resultType.getName()));
+        } else {
+          return Arrays.stream(constructors).filter(x -> findUsableConstructorByArgTypes(x, rsw.getJdbcTypes())).findAny();
+        }
+      });
   }
 
   private boolean findUsableConstructorByArgTypes(final Constructor<?> constructor, final List<JdbcType> jdbcTypes) {