private void SetNamespaceForNewTagsBasedOnExistingRoot()
{
IList <IStructureNode> rootKids = document.GetStructTreeRoot().GetKids();
if (rootKids.Count > 0)
{
PdfStructElem firstKid = (PdfStructElem)rootKids[0];
IRoleMappingResolver resolvedMapping = ResolveMappingToStandardOrDomainSpecificRole(firstKid.GetRole().GetValue
(), firstKid.GetNamespace());
if (resolvedMapping == null || !resolvedMapping.CurrentRoleIsStandard())
{
ILog logger = LogManager.GetLogger(typeof(iText.Kernel.Pdf.Tagutils.TagStructureContext));
String nsStr;
if (firstKid.GetNamespace() != null)
{
nsStr = firstKid.GetNamespace().GetNamespaceName();
}
else
{
nsStr = StandardNamespaces.GetDefault();
}
logger.Warn(String.Format(iText.IO.LogMessageConstant.EXISTING_TAG_STRUCTURE_ROOT_IS_NOT_STANDARD, firstKid
.GetRole().GetValue(), nsStr));
}
if (resolvedMapping == null || !StandardNamespaces.PDF_1_7.Equals(resolvedMapping.GetNamespace().GetNamespaceName
()))
{
documentDefaultNamespace = FetchNamespace(StandardNamespaces.PDF_2_0);
}
}
else
{
documentDefaultNamespace = FetchNamespace(StandardNamespaces.PDF_2_0);
}
}
/// <summary>Transforms root tags in a way that complies with the tagged PDF specification.</summary>
/// <remarks>
/// Transforms root tags in a way that complies with the tagged PDF specification.
/// Depending on PDF version behaviour may differ.
/// <br />
/// ISO 32000-1 (PDF 1.7 and lower)
/// 14.8.4.2 Grouping Elements
/// <br />
/// "In a tagged PDF document, the structure tree shall contain a single top-level element; that is,
/// the structure tree root (identified by the StructTreeRoot entry in the document catalogue) shall
/// have only one child in its K (kids) array. If the PDF file contains a complete document, the structure
/// type Document should be used for this top-level element in the logical structure hierarchy. If the file
/// contains a well-formed document fragment, one of the structure types Part, Art, Sect, or Div may be used instead."
/// <br />
/// For PDF 2.0 and higher root tag is allowed to have only the Document role.
/// </remarks>
public virtual void NormalizeDocumentRootTag()
{
// in this method we could deal with existing document, so we don't won't to throw exceptions here
bool forbid = forbidUnknownRoles;
forbidUnknownRoles = false;
IList <IStructureNode> rootKids = document.GetStructTreeRoot().GetKids();
IRoleMappingResolver mapping = null;
if (rootKids.Count > 0)
{
PdfStructElem firstKid = (PdfStructElem)rootKids[0];
mapping = ResolveMappingToStandardOrDomainSpecificRole(firstKid.GetRole().GetValue(), firstKid.GetNamespace
());
}
if (rootKids.Count == 1 && mapping != null && mapping.CurrentRoleIsStandard() && IsRoleAllowedToBeRoot(mapping
.GetRole()))
{
rootTagElement = (PdfStructElem)rootKids[0];
}
else
{
document.GetStructTreeRoot().GetPdfObject().Remove(PdfName.K);
rootTagElement = new RootTagNormalizer(this, rootTagElement, document).MakeSingleStandardRootTag(rootKids);
}
forbidUnknownRoles = forbid;
}