Protect implementation classes

Finalize and otherwise protect implementation classes.

Co-authored-by: Volkan Yazıcı <[email protected]>

Author: ppkarwasz

log4j-docgen/src/main/java/org/apache/logging/log4j/docgen/processor/AsciidocConverter.java

@@ -26,7 +26,7 @@
 /**
  * Converts a {@link DocCommentTree} into AsciiDoc text.
  */
-class AsciidocConverter {
+final class AsciidocConverter {
 
     private static final DocTreeVisitor<Void, AsciidocData> DOC_COMMENT_TREE_VISITOR = new DocCommentTreeVisitor();
     private static final DocTreeVisitor<Void, AsciidocData> PARAM_TREE_VISITOR = new ParamTreeVisitor();
@@ -54,7 +54,7 @@ public String toAsciiDoc(final ParamTree tree) {
         return data.getDocument().convert();
     }
 
-    private static class DocCommentTreeVisitor extends AbstractAsciidocTreeVisitor {
+    private static final class DocCommentTreeVisitor extends AbstractAsciidocTreeVisitor {
         @Override
         public Void visitDocComment(final DocCommentTree node, final AsciidocData data) {
             // Summary block wrapped in a new paragraph.
@@ -72,7 +72,7 @@ public Void visitDocComment(final DocCommentTree node, final AsciidocData data)
         }
     }
 
-    private static class ParamTreeVisitor extends AbstractAsciidocTreeVisitor {
+    private static final class ParamTreeVisitor extends AbstractAsciidocTreeVisitor {
         @Override
         public Void visitParam(final ParamTree node, final AsciidocData data) {
             for (final DocTree docTree : node.getDescription()) {

log4j-docgen/src/main/java/org/apache/logging/log4j/docgen/processor/AsciidocData.java

@@ -25,7 +25,7 @@
 import org.asciidoctor.ast.Document;
 import org.asciidoctor.ast.StructuralNode;
 
-class AsciidocData {
+final class AsciidocData {
     private final Document document;
     private int currentSectionLevel;
     private StructuralNode currentNode;

log4j-docgen/src/main/java/org/apache/logging/log4j/docgen/processor/internal/ContentNodeImpl.java

@@ -21,7 +21,7 @@
 import org.asciidoctor.ast.ContentNode;
 import org.asciidoctor.ast.Document;
 
-public abstract class ContentNodeImpl implements ContentNode {
+abstract class ContentNodeImpl implements ContentNode {
 
     private final ContentNode parent;
     private String context;

log4j-docgen/src/main/java/org/apache/logging/log4j/docgen/processor/internal/DocumentImpl.java

@@ -27,7 +27,7 @@
 import org.asciidoctor.ast.StructuralNode;
 import org.asciidoctor.ast.Title;
 
-public class DocumentImpl extends StructuralNodeImpl implements Document {
+public final class DocumentImpl extends StructuralNodeImpl implements Document {
 
     public DocumentImpl() {
         super(null);

log4j-docgen/src/main/java/org/apache/logging/log4j/docgen/processor/internal/ListImpl.java

@@ -23,7 +23,7 @@
 import org.asciidoctor.ast.ListItem;
 import org.asciidoctor.ast.StructuralNode;
 
-public class ListImpl extends StructuralNodeImpl implements List {
+public final class ListImpl extends StructuralNodeImpl implements List {
 
     public static final String ORDERED_LIST_CONTEXT = "olist";
     private static final char ORDERED_LIST_MARKER = '.';

log4j-docgen/src/main/java/org/apache/logging/log4j/docgen/processor/internal/ListItemImpl.java

@@ -21,7 +21,7 @@
 import org.asciidoctor.ast.ListItem;
 import org.asciidoctor.ast.StructuralNode;
 
-public class ListItemImpl extends StructuralNodeImpl implements ListItem {
+public final class ListItemImpl extends StructuralNodeImpl implements ListItem {
 
     public ListItemImpl(final ContentNode parent) {
         super(parent);

log4j-docgen/src/main/java/org/apache/logging/log4j/docgen/processor/internal/RowImpl.java

@@ -21,7 +21,7 @@
 import org.asciidoctor.ast.Cell;
 import org.asciidoctor.ast.Row;
 
-public class RowImpl implements Row {
+public final class RowImpl implements Row {
 
     private final List<Cell> cells = new ArrayList<>();
 

log4j-docgen/src/main/java/org/apache/logging/log4j/docgen/processor/internal/SectionImpl.java

@@ -24,7 +24,7 @@
 import org.asciidoctor.ast.Section;
 import org.asciidoctor.ast.StructuralNode;
 
-public class SectionImpl extends StructuralNodeImpl implements Section {
+public final class SectionImpl extends StructuralNodeImpl implements Section {
 
     private final List<StructuralNode> content = new ArrayList<>();
 

log4j-docgen/src/main/java/org/apache/logging/log4j/docgen/processor/internal/TableImpl.java

@@ -24,7 +24,7 @@
 import org.asciidoctor.ast.Row;
 import org.asciidoctor.ast.Table;
 
-public class TableImpl extends StructuralNodeImpl implements Table {
+public final class TableImpl extends StructuralNodeImpl implements Table {
 
     private final List<Row> header = new ArrayList<>();
     private final List<Row> body = new ArrayList<>();