refactor(*Db): make the constants/classes package visible where possible.

Addressed to #927

No functional changes.

Author: php-coder

src/main/java/ru/mystamps/web/feature/account/AccountDb.java

@@ -17,16 +17,17 @@
  */
 package ru.mystamps.web.feature.account;
 
-public final class AccountDb {
+@SuppressWarnings("PMD.CommentDefaultAccessModifier")
+final class AccountDb {
 
-	public static final class UsersActivation {
-		public static final int ACTIVATION_KEY_LENGTH = 10;
-		public static final int EMAIL_LENGTH          = 255;
+	static final class UsersActivation {
+		static final int ACTIVATION_KEY_LENGTH = 10;
+		static final int EMAIL_LENGTH          = 255;
 	}
 
-	public static final class User {
-		public static final int LOGIN_LENGTH = 15;
-		public static final int NAME_LENGTH  = 100;
+	static final class User {
+		static final int LOGIN_LENGTH = 15;
+		static final int NAME_LENGTH  = 100;
 	}
 
 }

src/main/java/ru/mystamps/web/feature/category/CategoryDb.java

@@ -17,10 +17,11 @@
  */
 package ru.mystamps.web.feature.category;
 
-public final class CategoryDb {
+@SuppressWarnings("PMD.CommentDefaultAccessModifier")
+final class CategoryDb {
 
-	public static final class Category {
-		public static final int NAME_LENGTH = 50;
+	static final class Category {
+		static final int NAME_LENGTH = 50;
 	}
 
 }

src/main/java/ru/mystamps/web/feature/country/CountryDb.java

@@ -17,10 +17,11 @@
  */
 package ru.mystamps.web.feature.country;
 
-public final class CountryDb {
+@SuppressWarnings("PMD.CommentDefaultAccessModifier")
+final class CountryDb {
 
-	public static final class Country {
-		public static final int NAME_LENGTH = 50;
+	static final class Country {
+		static final int NAME_LENGTH = 50;
 	}
 
 }

src/main/java/ru/mystamps/web/feature/series/importing/SeriesImportDb.java

@@ -20,8 +20,8 @@
 @SuppressWarnings("PMD.CommentDefaultAccessModifier")
 public final class SeriesImportDb {
 
-	public static final class SeriesImportRequest {
-		public static final int URL_LENGTH = 767;
+	static final class SeriesImportRequest {
+		static final int URL_LENGTH = 767;
 	}
 
 	public static final class SeriesImportRequestStatus {
@@ -39,7 +39,7 @@ public static final class SeriesImportRequestStatus {
 	static final class SeriesImportParsedData {
 		// see the following migration:
 		// 2018-07-05--series_import_parsed_data_michel_numbers_field.xml
-		public static final int MICHEL_NUMBERS_LENGTH = 19;
+		static final int MICHEL_NUMBERS_LENGTH = 19;
 	}
 
 }

src/main/java/ru/mystamps/web/feature/series/sale/SeriesSalesDb.java

@@ -17,10 +17,11 @@
  */
 package ru.mystamps.web.feature.series.sale;
 
-public final class SeriesSalesDb {
+@SuppressWarnings("PMD.CommentDefaultAccessModifier")
+final class SeriesSalesDb {
 
-	public static final class SeriesSales {
-		public static final int TRANSACTION_URL_LENGTH = 255;
+	static final class SeriesSales {
+		static final int TRANSACTION_URL_LENGTH = 255;
 	}
 
 }