public static ChangelogEntry readFromXmlFile()

in log4j-changelog/src/main/java/org/apache/logging/log4j/changelog/ChangelogEntry.java [149:203]
44 lines of code
7 McCabe index (conditional complexity)

    public static ChangelogEntry readFromXmlFile(final Path path) {

        // Read the `entry` root element
        final Element entryElement = XmlReader.readXmlFileRootElement(path, "entry");
        final String typeAttribute = XmlReader.requireAttribute(entryElement, "type");
        final Type type;
        try {
            type = Type.fromXmlAttribute(typeAttribute);
        } catch (final Exception error) {
            throw XmlReader.failureAtXmlNode(error, entryElement, "`type` attribute read failure");
        }

        // Read the `issue` elements
        final List<Issue> issues = XmlReader
                .findChildElementsMatchingName(entryElement, "issue")
                .map(issueElement -> {
                    final String issueId = XmlReader.requireAttribute(issueElement, "id");
                    final String issueLink = XmlReader.requireAttribute(issueElement, "link");
                    return new Issue(issueId, issueLink);
                })
                .collect(Collectors.toList());

        // Read the `author` elements
        final List<Author> authors = XmlReader
                .findChildElementsMatchingName(entryElement, "author")
                .map(authorElement -> {
                    @Nullable
                    final String authorId = authorElement.hasAttribute("id")
                            ? authorElement.getAttribute("id")
                            : null;
                    @Nullable
                    final String authorName = authorElement.hasAttribute("name")
                            ? authorElement.getAttribute("name")
                            : null;
                    if (authorId == null && authorName == null) {
                        throw XmlReader.failureAtXmlNode(
                                authorElement, "`author` must have at least one of `id` or `name` attributes");
                    }
                    return new Author(authorId, authorName);
                })
                .collect(Collectors.toList());
        if (authors.isEmpty()) {
            throw XmlReader.failureAtXmlNode(entryElement, "no `author` elements found");
        }

        // Read the `description` element
        final Element descriptionElement = XmlReader.requireChildElementMatchingName(entryElement, "description");
        final String descriptionFormat = XmlReader.requireAttribute(descriptionElement, "format");
        final String descriptionText = StringUtils.trimNullable(descriptionElement.getTextContent());
        final Description description = new Description(descriptionFormat, descriptionText);

        // Create the instance
        return new ChangelogEntry(type, issues, authors, description);

    }