dependencies: #2449 bump maven-checkstyle-plugin from 3.1.0 to 3.2.0 + resolve chec… (#2464)

* #2449 bump maven-checkstyle-plugin from 3.1.0 to 3.2.0 + resolve checkstyle issues

* remove FileSelectorJFrame.java to resolve checkstyle issue

* remove FileSelectorJFrame.java to resolve checkstyle issue

* remove FileSelectorJFrame.java to resolve checkstyle issue

* add refactored file with correct filename to resolve checkstyle issue

* add the test data

* change filenames from JFrame to Jframe for checkstyle

* fix code smell from  sonar report

* add new testcases to improve the test coverage

* remove code smell

special-case/src/main/java/com/iluwatar/specialcase/ApplicationServices.java

@@ -24,6 +24,9 @@
  */
 package com.iluwatar.specialcase;
 
+/**
+ * ApplicationServices interface to demonstrate special case pattern.
+ */
 public interface ApplicationServices {
 
   ReceiptViewModel loggedInUserPurchase(String userName, String itemName);

special-case/src/main/java/com/iluwatar/specialcase/ApplicationServicesImpl.java

@@ -24,6 +24,9 @@
  */
 package com.iluwatar.specialcase;
 
+/**
+ * Implementation of special case pattern.
+ */
 public class ApplicationServicesImpl implements ApplicationServices {
 
   private DomainServicesImpl domain = new DomainServicesImpl();

special-case/src/main/java/com/iluwatar/specialcase/Db.java

@@ -27,6 +27,9 @@ package com.iluwatar.specialcase;
 import java.util.HashMap;
 import java.util.Map;
 
+/**
+ * DB class for seeding user info.
+ */
 public class Db {
 
   private static Db instance;
@@ -113,6 +116,9 @@ public class Db {
     return itemName2Product.get(itemName);
   }
 
+  /**
+   * User class to store user info.
+   */
   public class User {
 
     private String userName;
@@ -130,6 +136,9 @@ public class Db {
     }
   }
 
+  /**
+   * Account info.
+   */
   public class Account {
 
     private Double amount;
@@ -156,6 +165,9 @@ public class Db {
     }
   }
 
+  /**
+   * Product info.
+   */
   public class Product {
 
     private Double price;

special-case/src/main/java/com/iluwatar/specialcase/DomainServices.java

@@ -24,5 +24,8 @@
  */
 package com.iluwatar.specialcase;
 
+/**
+ * DomainServices interface.
+ */
 public interface DomainServices {
 }

special-case/src/main/java/com/iluwatar/specialcase/DomainServicesImpl.java

@@ -24,6 +24,9 @@
  */
 package com.iluwatar.specialcase;
 
+/**
+ * Implementation of DomainServices for special case.
+ */
 public class DomainServicesImpl implements DomainServices {
 
   /**

special-case/src/main/java/com/iluwatar/specialcase/DownForMaintenance.java

@@ -27,6 +27,9 @@ package com.iluwatar.specialcase;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * Down for Maintenance view for the ReceiptViewModel.
+ */
 public class DownForMaintenance implements ReceiptViewModel {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(DownForMaintenance.class);

special-case/src/main/java/com/iluwatar/specialcase/InsufficientFunds.java

@@ -26,6 +26,9 @@ package com.iluwatar.specialcase;
 
 import lombok.extern.slf4j.Slf4j;
 
+/**
+ * View representing insufficient funds.
+ */
 @Slf4j
 public class InsufficientFunds implements ReceiptViewModel {
 

special-case/src/main/java/com/iluwatar/specialcase/InvalidUser.java

@@ -27,6 +27,9 @@ package com.iluwatar.specialcase;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * Receipt View representing invalid user.
+ */
 public class InvalidUser implements ReceiptViewModel {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(InvalidUser.class);

special-case/src/main/java/com/iluwatar/specialcase/MaintenanceLock.java

@@ -27,6 +27,9 @@ package com.iluwatar.specialcase;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * Acquire lock on the DB for maintenance.
+ */
 public class MaintenanceLock {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(MaintenanceLock.class);

special-case/src/main/java/com/iluwatar/specialcase/MoneyTransaction.java

@@ -24,6 +24,9 @@
  */
 package com.iluwatar.specialcase;
 
+/**
+ * Represents the money transaction taking place at a given moment.
+ */
 public class MoneyTransaction {
 
   private Double amount;

special-case/src/main/java/com/iluwatar/specialcase/OutOfStock.java

@@ -27,6 +27,9 @@ package com.iluwatar.specialcase;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * Receipt view for showing out of stock message.
+ */
 public class OutOfStock implements ReceiptViewModel {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(OutOfStock.class);

special-case/src/main/java/com/iluwatar/specialcase/ReceiptDto.java

@@ -27,6 +27,9 @@ package com.iluwatar.specialcase;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * Receipt view representing the transaction recceipt.
+ */
 public class ReceiptDto implements ReceiptViewModel {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(ReceiptDto.class);

special-case/src/main/java/com/iluwatar/specialcase/ReceiptViewModel.java

@@ -24,6 +24,9 @@
  */
 package com.iluwatar.specialcase;
 
+/**
+ * ReceiptViewModel interface.
+ */
 public interface ReceiptViewModel {
 
   void show();