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tnc1997 avatar tnc1997 commented on July 22, 2024

Hi @0xEquinox, thank you very much for your positive feedback!

I'm not sure why it's not working.

It looks like some of the classes might have the wrong annotation (@XmlElement). @XmlRootElement is the annotation that generates buildXmlElement and toXmlElement methods. You can compare the outputs below to see that in action:

@annotation.XmlEnum(fieldRename: annotation.FieldRename.pascal)
enum Language {
  mandarin,
  spanish,
  english,
  hindi,
  bengali,
}

@annotation.XmlRootElement(name: 'title')
@annotation.XmlSerializable()
class Title {
  @annotation.XmlAttribute(name: 'lang')
  Language? language;

  @annotation.XmlText()
  String? text;

  Title({
    this.language,
    this.text,
  });

  factory Title.fromXmlElement(XmlElement element) =>
      _$TitleFromXmlElement(element);

  @override
  String toString() {
    return 'Title{language: $language, text: $text}';
  }

  void buildXmlChildren(
    XmlBuilder builder, {
    Map<String, String> namespaces = const {},
  }) =>
      _$TitleBuildXmlChildren(
        this,
        builder,
        namespaces: namespaces,
      );

  void buildXmlElement(
    XmlBuilder builder, {
    Map<String, String> namespaces = const {},
  }) =>
      _$TitleBuildXmlElement(
        this,
        builder,
        namespaces: namespaces,
      );

  List<XmlAttribute> toXmlAttributes({
    Map<String, String?> namespaces = const {},
  }) =>
      _$TitleToXmlAttributes(
        this,
        namespaces: namespaces,
      );

  List<XmlNode> toXmlChildren({
    Map<String, String?> namespaces = const {},
  }) =>
      _$TitleToXmlChildren(
        this,
        namespaces: namespaces,
      );

  XmlElement toXmlElement({
    Map<String, String?> namespaces = const {},
  }) =>
      _$TitleToXmlElement(
        this,
        namespaces: namespaces,
      );
}

// **************************************************************************
// XmlEnumGenerator
// **************************************************************************

const $LanguageEnumMap = {
  Language.mandarin: 'Mandarin',
  Language.spanish: 'Spanish',
  Language.english: 'English',
  Language.hindi: 'Hindi',
  Language.bengali: 'Bengali'
};

// **************************************************************************
// XmlSerializableGenerator
// **************************************************************************

void _$TitleBuildXmlChildren(Title instance, XmlBuilder builder,
    {Map<String, String> namespaces = const {}}) {
  final language = instance.language;
  final languageSerialized =
      language != null ? $LanguageEnumMap[language]! : null;
  if (languageSerialized != null) {
    builder.attribute('lang', languageSerialized);
  }
  final text = instance.text;
  final textSerialized = text;
  if (textSerialized != null) {
    builder.text(textSerialized);
  }
}

void _$TitleBuildXmlElement(Title instance, XmlBuilder builder,
    {Map<String, String> namespaces = const {}}) {
  builder.element('title', namespaces: namespaces, nest: () {
    instance.buildXmlChildren(builder, namespaces: namespaces);
  });
}

Title _$TitleFromXmlElement(XmlElement element) {
  final language = element.getAttribute('lang');
  final text = element.getText();
  return Title(
      language: language != null
          ? $LanguageEnumMap.entries
              .singleWhere(
                  (languageEnumMapEntry) =>
                      languageEnumMapEntry.value == language,
                  orElse: () => throw ArgumentError(
                      '`$language` is not one of the supported values: ${$LanguageEnumMap.values.join(', ')}'))
              .key
          : null,
      text: text);
}

List<XmlAttribute> _$TitleToXmlAttributes(Title instance,
    {Map<String, String?> namespaces = const {}}) {
  final attributes = <XmlAttribute>[];
  final language = instance.language;
  final languageSerialized =
      language != null ? $LanguageEnumMap[language]! : null;
  final languageConstructed = languageSerialized != null
      ? XmlAttribute(XmlName('lang'), languageSerialized)
      : null;
  if (languageConstructed != null) {
    attributes.add(languageConstructed);
  }
  return attributes;
}

List<XmlNode> _$TitleToXmlChildren(Title instance,
    {Map<String, String?> namespaces = const {}}) {
  final children = <XmlNode>[];
  final text = instance.text;
  final textSerialized = text;
  final textConstructed =
      textSerialized != null ? XmlText(textSerialized) : null;
  if (textConstructed != null) {
    children.add(textConstructed);
  }
  return children;
}

XmlElement _$TitleToXmlElement(Title instance,
    {Map<String, String?> namespaces = const {}}) {
  return XmlElement(
      XmlName('title'),
      [
        ...namespaces.toXmlAttributes(),
        ...instance.toXmlAttributes(namespaces: namespaces)
      ],
      instance.toXmlChildren(namespaces: namespaces));
}
@annotation.XmlEnum(fieldRename: annotation.FieldRename.pascal)
enum Language {
  mandarin,
  spanish,
  english,
  hindi,
  bengali,
}

@annotation.XmlSerializable()
class Title {
  @annotation.XmlAttribute(name: 'lang')
  Language? language;

  @annotation.XmlText()
  String? text;

  Title({
    this.language,
    this.text,
  });

  factory Title.fromXmlElement(XmlElement element) =>
      _$TitleFromXmlElement(element);

  @override
  String toString() {
    return 'Title{language: $language, text: $text}';
  }

  void buildXmlChildren(
    XmlBuilder builder, {
    Map<String, String> namespaces = const {},
  }) =>
      _$TitleBuildXmlChildren(
        this,
        builder,
        namespaces: namespaces,
      );

  void buildXmlElement(
    XmlBuilder builder, {
    Map<String, String> namespaces = const {},
  }) =>
      _$TitleBuildXmlElement(
        this,
        builder,
        namespaces: namespaces,
      );

  List<XmlAttribute> toXmlAttributes({
    Map<String, String?> namespaces = const {},
  }) =>
      _$TitleToXmlAttributes(
        this,
        namespaces: namespaces,
      );

  List<XmlNode> toXmlChildren({
    Map<String, String?> namespaces = const {},
  }) =>
      _$TitleToXmlChildren(
        this,
        namespaces: namespaces,
      );

  XmlElement toXmlElement({
    Map<String, String?> namespaces = const {},
  }) =>
      _$TitleToXmlElement(
        this,
        namespaces: namespaces,
      );
}

// **************************************************************************
// XmlEnumGenerator
// **************************************************************************

const $LanguageEnumMap = {
  Language.mandarin: 'Mandarin',
  Language.spanish: 'Spanish',
  Language.english: 'English',
  Language.hindi: 'Hindi',
  Language.bengali: 'Bengali'
};

// **************************************************************************
// XmlSerializableGenerator
// **************************************************************************

void _$TitleBuildXmlChildren(Title instance, XmlBuilder builder,
    {Map<String, String> namespaces = const {}}) {
  final language = instance.language;
  final languageSerialized =
      language != null ? $LanguageEnumMap[language]! : null;
  if (languageSerialized != null) {
    builder.attribute('lang', languageSerialized);
  }
  final text = instance.text;
  final textSerialized = text;
  if (textSerialized != null) {
    builder.text(textSerialized);
  }
}

Title _$TitleFromXmlElement(XmlElement element) {
  final language = element.getAttribute('lang');
  final text = element.getText();
  return Title(
      language: language != null
          ? $LanguageEnumMap.entries
              .singleWhere(
                  (languageEnumMapEntry) =>
                      languageEnumMapEntry.value == language,
                  orElse: () => throw ArgumentError(
                      '`$language` is not one of the supported values: ${$LanguageEnumMap.values.join(', ')}'))
              .key
          : null,
      text: text);
}

List<XmlAttribute> _$TitleToXmlAttributes(Title instance,
    {Map<String, String?> namespaces = const {}}) {
  final attributes = <XmlAttribute>[];
  final language = instance.language;
  final languageSerialized =
      language != null ? $LanguageEnumMap[language]! : null;
  final languageConstructed = languageSerialized != null
      ? XmlAttribute(XmlName('lang'), languageSerialized)
      : null;
  if (languageConstructed != null) {
    attributes.add(languageConstructed);
  }
  return attributes;
}

List<XmlNode> _$TitleToXmlChildren(Title instance,
    {Map<String, String?> namespaces = const {}}) {
  final children = <XmlNode>[];
  final text = instance.text;
  final textSerialized = text;
  final textConstructed =
      textSerialized != null ? XmlText(textSerialized) : null;
  if (textConstructed != null) {
    children.add(textConstructed);
  }
  return children;
}

What should I do to turn my String containing all the XML into Dart objects?

You'll want to parse the string as an XmlDocument and then pass the rootElement to the fromXmlElement method:

dart-xml-serializable/xml_serializable/example/xml_serializable_example.dart

Lines 7 to 25 in d7ad368

final document = XmlDocument.parse(
'''<?xml version="1.0"?>
<bookshelf>
<book>
<title lang="English">XML Pocket Reference</title>
<author>Simon St. Laurent</author>
<author>Michael James Fitzgerald</author>
<price></price>
</book>
<book>
<title lang="English">HTML and XHTML Pocket Reference</title>
<author>Jennifer Niederst Robbins</author>
<price></price>
</book>
</bookshelf>''',
);
final bookshelf = Bookshelf.fromXmlElement(document.rootElement);
print(bookshelf);

from dart-xml-serializable.

0xEquinox avatar 0xEquinox commented on July 22, 2024

Thank you, using the root element annotation did work, though I'm a little confused as to the difference? When should I use XmlRootElement and when do I use the normal XmlElement? Intuitively I think the root element is the outermost one, but I don't think that's quite right. Anyway, it works now, thank you so much! Have a wonderful day.

from dart-xml-serializable.

tnc1997 avatar tnc1997 commented on July 22, 2024

When should I use XmlRootElement and when do I use the normal XmlElement?

You would typically use @XmlRootElement on the class that represents the root element (as this annotation generates buildXmlElement and toXmlElement methods) and then @XmlElement on the fields that are within each class.

https://learn.microsoft.com/en-us/dotnet/api/system.xml.serialization.xmlrootattribute
https://docs.oracle.com/javase/8/docs/api/javax/xml/bind/annotation/XmlRootElement.html

Anyway, it works now, thank you so much! Have a wonderful day.

You're welcome, happy to help, you too!

from dart-xml-serializable.

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