feat(objectionary#226): add several puzzles for RawXml class

src/main/java/org/eolang/opeo/ast/RawXml.java

@@ -1,32 +1,77 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016-2023 Objectionary.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
 package org.eolang.opeo.ast;
 
 import com.jcabi.xml.XMLDocument;
 import java.util.Collections;
 import java.util.List;
 import org.eolang.jeo.representation.xmir.XmlNode;
-import org.w3c.dom.Node;
 import org.xembly.Directive;
 import org.xembly.Directives;
-import org.xembly.ImpossibleModificationException;
-import org.xembly.Xembler;
 
+/**
+ * This class represents a raw XML node.
+ * It is used to represent nodes that we don't know how to parse yet.
+ *
+ * @since 0.1
+ */
 public final class RawXml implements AstNode {
 
+    /**
+     * XML node.
+     */
     private final XmlNode node;
 
+    /**
+     * Constructor.
+     * @param node XML node.
+     */
     public RawXml(final XmlNode node) {
         this.node = node;
     }
 
     @Override
     public List<AstNode> opcodes() {
+        //@checkstyle MethodBodyCommentsCheck (10 lines)
+        // @todo #226:90min Refactor AstNode#opcodes() Method Usage.
+        //  This method is used improperly in the codebase since we have such strange
+        //  implementations as in the RawXml class. We need to refactor the codebase
+        //  and maybe just remove this method and use only `toXmir`.
+        //  So, we need to investigate this.
         return Collections.singletonList(this);
     }
 
     @Override
     public Iterable<Directive> toXmir() {
-        //todo!
-        return new Directives().append(new XMLDocument(
-            new XMLDocument(this.node.node()).toString()).node());
+        //@checkstyle MethodBodyCommentsCheck (10 line)
+        // @todo #226:90min Inefficient RawXml#toXmir() Method Implementation.
+        //  This method is inefficient because it creates a new XMLDocument
+        //  instance and then converts it to a string. We need to refactor this
+        //  method to be more efficient.
+        return new Directives().append(
+            new XMLDocument(
+                new XMLDocument(this.node.node()).toString()).node()
+        );
     }
 }