KMLSchemaValidator.h

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#pragma once
 
#include <QtCore/QHash>
#include <QtCore/QSet>
#include <QtCore/QStringList>
 
class QDomDocument;
class QDomElement;
 
class KMLSchemaValidator
{
public:
    static KMLSchemaValidator *instance();
 
    struct ValidationResult {
        bool isValid = true;
        QStringList errors;
        QStringList warnings;
 
        void addError(const QString &msg) { errors.append(msg); isValid = false; }
        void addWarning(const QString &msg) { warnings.append(msg); }
    };
 
    ValidationResult validate(const QDomDocument &doc) const;
 
    ValidationResult validateFile(const QString &kmlFile) const;
 
    bool isValidEnumValue(const QString &enumTypeName, const QString &value) const;
 
    QStringList validEnumValues(const QString &enumTypeName) const;
 
    bool isValidElement(const QString &elementName) const;
 
    QStringList validElements() const;
 
private:
    KMLSchemaValidator();
    void loadSchema();
    void parseSchemaDocument(const QDomDocument &schemaDoc);
    void extractEnumTypes(const QDomElement &root);
    void extractElements(const QDomElement &root);
 
    void validateElement(const QDomElement &element, ValidationResult &result) const;
    void validateCoordinates(const QString &coordString, ValidationResult &result) const;
 
    QHash<QString, QStringList> _enumTypes;  // enumTypeName -> valid values
    QSet<QString> _validElements;            // set of valid element names
    bool _loaded = false;
};