1. import java.io.*;
  2. import java.util.HashMap;
  3. import java.util.Map;
  5. public class HtmlSerializer {
  7. private static final String VALID_TAGS = "<html><body><head><title></title></head><body><h1></h1><p></p><br><hr></body></html>"; // Basic validation
  8. private static final String TAG_OPEN_REGEX = "<([a-zA-Z]+)";
  9. private static final String TAG_CLOSE_REGEX = "</([a-zA-Z]+)>";
  10. private static final String COMMENT_REGEX = "<!--.*?-->";
  13. public static String serializeHtml(Object obj) {
  14. if (obj == null) {
  15. return "<p>Null object</p>"; //Handle null input
  16. }
  18. try {
  19. return serialize(obj, 0);
  20. } catch (Exception e) {
  21. return "<p>Error serializing object: " + e.getMessage() + "</p>";
  22. }
  23. }
  25. private static String serialize(Object obj, int indent) throws Exception {
  26. StringBuilder sb = new StringBuilder();
  28. if (obj instanceof String) {
  29. String str = (String) obj;
  30. sb.append(" ").append(str).append("\n"); //Indent string content
  31. } else if (obj instanceof Integer || obj instanceof Double || obj instanceof Boolean) {
  32. sb.append(" ").append(obj).append("\n"); //Indent primitive types
  33. } else if (obj instanceof HTMLPage) {
  34. HTMLPage page = (HTMLPage) obj;
  35. sb.append(" ").append(page.getTag()).append("\n");
  36. for (int i = 0; i < indent + 4; i++) {
  37. sb.append(" ");
  38. }
  39. sb.append(serialize(page.getContent(), indent + 4));
  40. sb.append(" ").append("</").append(page.getTag()).append(">\n");
  41. }
  42. else if (obj == null) {
  43. sb.append(" <null>\n");
  44. }
  45. else {
  46. throw new IllegalArgumentException("Unsupported object type: " + obj.getClass().getName());
  47. }
  49. return sb.toString();
  50. }
  54. public static class HTMLPage {
  55. private String tag;
  56. private String content;
  58. public HTMLPage(String tag, String content) {
  59. this.tag = tag;
  60. this.content = content;
  61. }
  63. public String getTag() {
  64. return tag;
  65. }
  67. public String getContent() {
  68. return content;
  69. }
  70. }
  73. public static void main(String[] args) {
  74. //Example Usage
  75. HTMLPage page = new HTMLPage("html", "<head><title>Test</title></head><body><h1>Hello</h1><p>World</p></body></html>");
  76. String serializedHtml = serializeHtml(page);
  77. System.out.println(serializedHtml);
  79. String simpleString = "This is a test string";
  80. String serializedString = serializeHtml(simpleString);
  81. System.out.println(serializedString);
  83. Integer number = 123;
  84. String serializedNumber = serializeHtml(number);
  85. System.out.println(serializedNumber);
  87. Object nullObject = null;
  88. String serializedNull = serializeHtml(nullObject);
  89. System.out.println(serializedNull);
  91. }
  92. }

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