Set private constructor to hide implicit public constructor (Sonar)

plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/CheckLocalRepositoryDirCommand.java

@@ -7,6 +7,9 @@
 /** Commands for checking and creating the local repository directory if it doesn't exist. */
 class CheckLocalRepositoryDirCommand {
 
+private CheckLocalRepositoryDirCommand() {
+}
+
   static class CheckParentDirCommand extends AbstractQueryCommand {
 
     private static final CheckParentDirCommand INSTANCE = new CheckParentDirCommand();

plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/Ignorable.java

@@ -5,5 +5,8 @@
 
 /** Internal Tag Object for Ignorable Messages */
 class Ignorable {
+  private Ignorable() {
+  }
+
   public static final Logger LOGGER = LoggerFactory.getLogger(Ignorable.class);
 }

plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/POMDocumentFactory.java

@@ -17,6 +17,9 @@
  */
 class POMDocumentFactory {
 
+private POMDocumentFactory() {
+}
+
   /**
    * Loads a POM document from the provided input stream.
    *

plugins/codemodder-plugin-maven/src/main/java/io/codemodder/plugins/maven/operator/Util.java

@@ -21,6 +21,9 @@
 /** Common Utilities */
 class Util {
 
+private Util() {
+}
+
   private static final Logger LOGGER = LoggerFactory.getLogger(Util.class);
 
   /** Represents a Property Reference - as a regex */