diff --git a/src/main/java/org/cqfn/astranaut/core/Info.java b/src/main/java/org/cqfn/astranaut/core/Info.java
index 0db0d0f..57bba39 100644
--- a/src/main/java/org/cqfn/astranaut/core/Info.java
+++ b/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 {
diff --git a/src/main/java/org/cqfn/astranaut/core/algorithms/patching/Matcher.java b/src/main/java/org/cqfn/astranaut/core/algorithms/patching/Matcher.java
index d74e921..76127cb 100644
--- a/src/main/java/org/cqfn/astranaut/core/algorithms/patching/Matcher.java
+++ b/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;
-    }
 }
diff --git a/src/main/java/org/cqfn/astranaut/core/base/Action.java b/src/main/java/org/cqfn/astranaut/core/base/Action.java
index 3a92706..8e7a365 100644
--- a/src/main/java/org/cqfn/astranaut/core/base/Action.java
+++ b/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;
+    }
 }