#143 Extracted convertor to a separate reusable component

Author: Roman Glushko

src/com/magento/idea/magento2plugin/actions/generation/dialog/NewCronjobDialog.java

@@ -15,6 +15,7 @@
 import com.magento.idea.magento2plugin.actions.generation.generator.util.NamespaceBuilder;
 import com.magento.idea.magento2plugin.indexes.CronGroupIndex;
 import com.magento.idea.magento2plugin.ui.FilteredComboBox;
+import com.magento.idea.magento2plugin.util.CamelCaseToSnakeCase;
 import com.magento.idea.magento2plugin.util.magento.GetModuleNameByDirectory;
 
 import javax.swing.*;
@@ -42,11 +43,13 @@ public class NewCronjobDialog extends AbstractDialog {
     private Project project;
     private String moduleName;
     private NewCronjobValidator validator;
+    private CamelCaseToSnakeCase camelCaseToSnakeCase;
 
     public NewCronjobDialog(Project project, PsiDirectory directory) {
         this.project = project;
         this.moduleName = GetModuleNameByDirectory.getInstance(project).execute(directory);
         this.validator = NewCronjobValidator.getInstance();
+        this.camelCaseToSnakeCase = CamelCaseToSnakeCase.getInstance();
 
         setContentPane(contentPane);
         setModal(true);
@@ -179,7 +182,7 @@ private String suggestCronjobName(String moduleName, String cronjobClassname) {
             return this.moduleName.toLowerCase();
         }
 
-        String cronjobClassnameToSnakeCase = cronjobClassname.replaceAll("\\B([A-Z])", "_$1").toLowerCase();
+        String cronjobClassnameToSnakeCase = this.camelCaseToSnakeCase.convert(cronjobClassname);
 
         return this.moduleName.toLowerCase() + "_" + cronjobClassnameToSnakeCase;
     }

src/com/magento/idea/magento2plugin/util/CamelCaseToSnakeCase.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+package com.magento.idea.magento2plugin.util;
+
+public class CamelCaseToSnakeCase {
+    private static CamelCaseToSnakeCase INSTANCE = null;
+
+    public static CamelCaseToSnakeCase getInstance() {
+        if (null == INSTANCE) {
+            INSTANCE = new CamelCaseToSnakeCase();
+        }
+        return INSTANCE;
+    }
+
+    /**
+     * Convert camelCaseString to snake_case_string
+     *
+     * @param camelCaseString
+     *
+     * @return String
+     */
+    public String convert(String camelCaseString) {
+        return camelCaseString.replaceAll("\\B([A-Z])", "_$1").toLowerCase();
+    }
+}