Thorough polishing

src/main/java/org/cqfn/astranaut/core/Info.java

@@ -25,7 +25,6 @@
 
 /**
  * This class provides static information about the library, such as the version.
- *
  * @since 1.0.6
  */
 public final class Info {

src/main/java/org/cqfn/astranaut/core/algorithms/patching/Matcher.java

@@ -36,7 +36,6 @@
 import org.cqfn.astranaut.core.base.Node;
 import org.cqfn.astranaut.core.base.Pattern;
 import org.cqfn.astranaut.core.base.PatternNode;
-import org.cqfn.astranaut.core.base.PrototypeBasedNode;
 import org.cqfn.astranaut.core.base.Replace;
 import org.cqfn.astranaut.core.base.Tree;
 
@@ -105,7 +104,7 @@ Set<Node> match(final Pattern pattern) {
  @SuppressWarnings("PMD.UnusedFormalParameter")
  private boolean checkNode(final Node node, final Node parent, final Node pattern) {
  final Node sample;
- final Action action = Matcher.nodeToAction(pattern);
+ final Action action = Action.toAction(pattern);
  if (action instanceof Replace || action instanceof Delete) {
  sample = action.getBefore();
  } else {
@@ -142,7 +141,7 @@ private boolean checkChildren(final Node node, final Node sample) {
  Node current = null;
  while (result && offset < right && iterator.hasNext()) {
  final Node child = iterator.next();
- final Action action = Matcher.nodeToAction(child);
+ final Action action = Action.toAction(child);
  if (action instanceof Insert) {
  this.actions.insertNodeAfter(action.getAfter(), node, current);
  } else if (index + offset >= left) {
@@ -160,22 +159,4 @@ private boolean checkChildren(final Node node, final Node sample) {
  }
  return result;
  }
-
- /**
- * Converts a node reference to an action reference if the node is an action
- * or the node prototype is an action.
- * @param node Node
- * @return Action or {@code null} if the node is not an action
- */
- private static Action nodeToAction(final Node node) {
- final Action action;
- if (node instanceof Action) {
- action = (Action) node;
- } else if (node instanceof PrototypeBasedNode) {
- action = Matcher.nodeToAction(((PrototypeBasedNode) node).getPrototype());
- } else {
- action = null;
- }
- return action;
- }
 }

src/main/java/org/cqfn/astranaut/core/base/Action.java

@@ -25,9 +25,26 @@
 
 /**
  * A node that represents an action that can be performed on another node.
- * This type of nodes is necessary for the construction of difference trees.
- *
+ * This type of nodes is necessary for the construction of difference trees.
  * @since 1.1.0
  */
+@SuppressWarnings("PMD.ProhibitPublicStaticMethods")
 public interface Action extends DiffTreeItem, PatternItem {
+ /**
+ * Converts a node reference to an action reference if the node is an action
+ * or the node prototype is an action.
+ * @param node Node
+ * @return Action or {@code null} if the node is not an action
+ */
+ static Action toAction(final Node node) {
+ final Action action;
+ if (node instanceof Action) {
+ action = (Action) node;
+ } else if (node instanceof PrototypeBasedNode) {
+ action = Action.toAction(((PrototypeBasedNode) node).getPrototype());
+ } else {
+ action = null;
+ }
+ return action;
+ }
 }