source: trunk/src/xmlpatterns/api/qxmlschemavalidator.cpp

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#include "qxmlschemavalidator.h"
#include "qxmlschemavalidator_p.h"

#include "qacceltreeresourceloader_p.h"
#include "qxmlschema.h"
#include "qxmlschema_p.h"
#include "qxsdvalidatinginstancereader_p.h"

#include <QtCore/QBuffer>
#include <QtCore/QIODevice>
#include <QtCore/QUrl>

QT_BEGIN_NAMESPACE

/*!
  \class QXmlSchemaValidator

  \brief The QXmlSchemaValidator class validates XML instance documents against a W3C XML Schema.

  \reentrant
  \since 4.6
  \ingroup xml-tools

  The QXmlSchemaValidator class loads, parses an XML instance document and validates it
  against a W3C XML Schema that has been compiled with \l{QXmlSchema}.

  The following example shows how to load a XML Schema from a local
  file, check whether it is a valid schema document and use it for validation
  of an XML instance document:

  \snippet doc/src/snippets/qxmlschemavalidator/main.cpp 3

  \section1 XML Schema Version

  This class implements schema validation according to the \l{XML Schema} 1.0
  specification.

  \sa QXmlSchema, {xmlpatterns/schema}{XML Schema Validation Example}
*/

/*!
  Constructs a schema validator.
  The schema used for validation must be referenced in the XML instance document
  via the \c xsi:schemaLocation or \c xsi:noNamespaceSchemaLocation attribute.
 */
QXmlSchemaValidator::QXmlSchemaValidator()
    : d(new QXmlSchemaValidatorPrivate(QXmlSchema()))
{
}

/*!
  Constructs a schema validator that will use \a schema for validation.
  If an empty \l {QXmlSchema} schema is passed to the validator, the schema used
  for validation must be referenced in the XML instance document
  via the \c xsi:schemaLocation or \c xsi:noNamespaceSchemaLocation attribute.
 */
QXmlSchemaValidator::QXmlSchemaValidator(const QXmlSchema &schema)
    : d(new QXmlSchemaValidatorPrivate(schema))
{
}

/*!
  Destroys this QXmlSchemaValidator.
 */
QXmlSchemaValidator::~QXmlSchemaValidator()
{
    delete d;
}

/*!
  Sets the \a schema that shall be used for further validation.
  If the schema is empty, the schema used for validation must be referenced
  in the XML instance document via the \c xsi:schemaLocation or
  \c xsi:noNamespaceSchemaLocation attribute.
 */
void QXmlSchemaValidator::setSchema(const QXmlSchema &schema)
{
    d->setSchema(schema);
}

/*!
  Validates the XML instance document read from \a data with the
  given \a documentUri against the schema.

  Returns \c true if the XML instance document is valid according to the
  schema, \c false otherwise.

  Example:

  \snippet doc/src/snippets/qxmlschemavalidator/main.cpp 2
 */
bool QXmlSchemaValidator::validate(const QByteArray &data, const QUrl &documentUri) const
{
    QByteArray localData(data);

    QBuffer buffer(&localData);
    buffer.open(QIODevice::ReadOnly);

    return validate(&buffer, documentUri);
}

/*!
  Validates the XML instance document read from \a source against the schema.

  Returns \c true if the XML instance document is valid according to the
  schema, \c false otherwise.

  Example:

  \snippet doc/src/snippets/qxmlschemavalidator/main.cpp 0
 */
bool QXmlSchemaValidator::validate(const QUrl &source) const
{
    d->m_context->setMessageHandler(messageHandler());
    d->m_context->setUriResolver(uriResolver());
    d->m_context->setNetworkAccessManager(networkAccessManager());

    const QPatternist::AutoPtr<QNetworkReply> reply(QPatternist::AccelTreeResourceLoader::load(source, d->m_context->networkAccessManager(),
                                                                                               d->m_context, QPatternist::AccelTreeResourceLoader::ContinueOnError));
    if (reply)
        return validate(reply.data(), source);
    else
        return false;
}

/*!
  Validates the XML instance document read from \a source with the
  given \a documentUri against the schema.

  Returns \c true if the XML instance document is valid according to the
  schema, \c false otherwise.

  Example:

  \snippet doc/src/snippets/qxmlschemavalidator/main.cpp 1
 */
bool QXmlSchemaValidator::validate(QIODevice *source, const QUrl &documentUri) const
{
    if (!source) {
        qWarning("A null QIODevice pointer cannot be passed.");
        return false;
    }

    if (!source->isReadable()) {
        qWarning("The device must be readable.");
        return false;
    }

    const QUrl normalizedUri = QPatternist::XPathHelper::normalizeQueryURI(documentUri);

    d->m_context->setMessageHandler(messageHandler());
    d->m_context->setUriResolver(uriResolver());
    d->m_context->setNetworkAccessManager(networkAccessManager());

    QPatternist::NetworkAccessDelegator::Ptr delegator(new QPatternist::NetworkAccessDelegator(d->m_context->networkAccessManager(),
                                                                                               d->m_context->networkAccessManager()));

    QPatternist::AccelTreeResourceLoader loader(d->m_context->namePool(), delegator, QPatternist::AccelTreeBuilder<true>::SourceLocationsFeature);

    QPatternist::Item item;
    try {
        item = loader.openDocument(source, normalizedUri, d->m_context);
    } catch (QPatternist::Exception exception) {
        return false;
    }

    QXmlNodeModelIndex index = item.asNode();
    const QAbstractXmlNodeModel *model = item.asNode().model();

    QPatternist::XsdValidatedXmlNodeModel *validatedModel = new QPatternist::XsdValidatedXmlNodeModel(model);

    QPatternist::XsdValidatingInstanceReader reader(validatedModel, normalizedUri, d->m_context);
    if (d->m_schema)
        reader.addSchema(d->m_schema, d->m_schemaDocumentUri);
    try {
        reader.read();
    } catch (QPatternist::Exception exception) {
        return false;
    }

    return true;
}