public virtual int GetNextMcidForPage(PdfPage page)
{
ParentTreeHandler.PageMcrsContainer pageMcrs = GetPageMarkedContentReferences(page);
if (pageMcrs == null || pageMcrs.GetPageContentStreamsMcrs().Count == 0)
{
return(0);
}
else
{
return((int)Enumerable.Last(pageMcrs.GetPageContentStreamsMcrs()).Key + 1);
}
}
/// <summary>Creates and flushes parent tree entry for the page.</summary>
/// <remarks>
/// Creates and flushes parent tree entry for the page.
/// Effectively this means that new content mustn't be added to the page.
/// </remarks>
/// <param name="page">
///
/// <see cref="iText.Kernel.Pdf.PdfPage"/>
/// for which to create parent tree entry. Typically this page is flushed after this
/// call.
/// </param>
public virtual void CreateParentTreeEntryForPage(PdfPage page)
{
ParentTreeHandler.PageMcrsContainer mcrs = GetPageMarkedContentReferences(page);
if (mcrs == null)
{
return;
}
pageToPageMcrs.JRemove(page.GetPdfObject().GetIndirectReference());
if (UpdateStructParentTreeEntries(page, mcrs))
{
structTreeRoot.SetModified();
}
}
private bool UpdateStructParentTreeEntries(PdfPage page, ParentTreeHandler.PageMcrsContainer mcrs)
{
bool res = false;
foreach (KeyValuePair <int, PdfMcr> entry in mcrs.GetObjRefs())
{
PdfMcr mcr = entry.Value;
PdfDictionary parentObj = ((PdfStructElem)mcr.GetParent()).GetPdfObject();
if (!parentObj.IsIndirect())
{
continue;
}
int structParent = entry.Key;
parentTree.AddEntry(structParent, parentObj);
res = true;
}
int pageStructParentIndex;
foreach (KeyValuePair <PdfIndirectReference, SortedDictionary <int, PdfMcr> > entry in mcrs.GetPageResourceXObjects
())
{
PdfIndirectReference xObjectRef = entry.Key;
if (xObjectToStructParentsInd.ContainsKey(xObjectRef))
{
pageStructParentIndex = (int)xObjectToStructParentsInd.JRemove(xObjectRef);
if (UpdateStructParentTreeForContentStreamEntries(entry.Value, pageStructParentIndex))
{
res = true;
}
}
}
if (page.IsFlushed())
{
PdfIndirectReference pageRef = page.GetPdfObject().GetIndirectReference();
if (!pageToStructParentsInd.ContainsKey(pageRef))
{
return(res);
}
pageStructParentIndex = (int)pageToStructParentsInd.JRemove(pageRef);
}
else
{
pageStructParentIndex = GetOrCreatePageStructParentIndex(page);
}
if (UpdateStructParentTreeForContentStreamEntries(mcrs.GetPageContentStreamsMcrs(), pageStructParentIndex)
)
{
res = true;
}
return(res);
}
public virtual PdfObjRef FindObjRefByStructParentIndex(PdfDictionary pageDict, int structParentIndex)
{
ParentTreeHandler.PageMcrsContainer pageMcrs = pageToPageMcrs.Get(pageDict.GetIndirectReference());
return(pageMcrs != null ? (PdfObjRef)pageMcrs.GetObjRefs().Get(structParentIndex) : null);
}
// Mind that this method searches among items contained in page's content stream only
public virtual PdfMcr FindMcrByMcid(PdfDictionary pageDict, int mcid)
{
ParentTreeHandler.PageMcrsContainer pageMcrs = pageToPageMcrs.Get(pageDict.GetIndirectReference());
return(pageMcrs != null?pageMcrs.GetPageContentStreamsMcrs().Get(mcid) : null);
}
public virtual void UnregisterMcr(PdfMcr mcrToUnregister)
{
PdfDictionary pageDict = mcrToUnregister.GetPageObject();
if (pageDict == null)
{
// invalid mcr, ignore
return;
}
if (pageDict.IsFlushed())
{
throw new PdfException(PdfException.CannotRemoveMarkedContentReferenceBecauseItsPageWasAlreadyFlushed);
}
ParentTreeHandler.PageMcrsContainer pageMcrs = pageToPageMcrs.Get(pageDict.GetIndirectReference());
if (pageMcrs != null)
{
PdfObject stm;
if ((stm = GetStm(mcrToUnregister)) != null)
{
PdfIndirectReference xObjectReference = stm is PdfIndirectReference ? (PdfIndirectReference)stm : stm.GetIndirectReference
();
pageMcrs.GetPageResourceXObjects().Get(xObjectReference).JRemove(mcrToUnregister.GetMcid());
if (pageMcrs.GetPageResourceXObjects().Get(xObjectReference).IsEmpty())
{
pageMcrs.GetPageResourceXObjects().JRemove(xObjectReference);
xObjectToStructParentsInd.JRemove(xObjectReference);
}
structTreeRoot.SetModified();
}
else
{
if (mcrToUnregister is PdfObjRef)
{
PdfDictionary obj = ((PdfDictionary)mcrToUnregister.GetPdfObject()).GetAsDictionary(PdfName.Obj);
if (obj != null && !obj.IsFlushed())
{
PdfNumber n = obj.GetAsNumber(PdfName.StructParent);
if (n != null)
{
pageMcrs.GetObjRefs().JRemove(n.IntValue());
structTreeRoot.SetModified();
return;
}
}
foreach (KeyValuePair <int, PdfMcr> entry in pageMcrs.GetObjRefs())
{
if (entry.Value.GetPdfObject() == mcrToUnregister.GetPdfObject())
{
pageMcrs.GetObjRefs().JRemove(entry.Key);
structTreeRoot.SetModified();
break;
}
}
}
else
{
pageMcrs.GetPageContentStreamsMcrs().JRemove(mcrToUnregister.GetMcid());
structTreeRoot.SetModified();
}
}
}
}
private void RegisterMcr(PdfMcr mcr, bool registeringOnInit)
{
PdfIndirectReference mcrPageIndRef = mcr.GetPageIndirectReference();
if (mcrPageIndRef == null || (!(mcr is PdfObjRef) && mcr.GetMcid() < 0))
{
ILog logger = LogManager.GetLogger(typeof(iText.Kernel.Pdf.Tagging.ParentTreeHandler));
logger.Error(iText.IO.LogMessageConstant.ENCOUNTERED_INVALID_MCR);
return;
}
ParentTreeHandler.PageMcrsContainer pageMcrs = pageToPageMcrs.Get(mcrPageIndRef);
if (pageMcrs == null)
{
pageMcrs = new ParentTreeHandler.PageMcrsContainer();
pageToPageMcrs.Put(mcrPageIndRef, pageMcrs);
}
PdfObject stm;
if ((stm = GetStm(mcr)) != null)
{
PdfIndirectReference stmIndRef;
PdfStream xObjectStream;
if (stm is PdfIndirectReference)
{
stmIndRef = (PdfIndirectReference)stm;
xObjectStream = (PdfStream)stmIndRef.GetRefersTo();
}
else
{
if (stm.GetIndirectReference() == null)
{
stm.MakeIndirect(structTreeRoot.GetDocument());
}
stmIndRef = stm.GetIndirectReference();
xObjectStream = (PdfStream)stm;
}
int?structParent = xObjectStream.GetAsInt(PdfName.StructParents);
if (structParent != null)
{
xObjectToStructParentsInd.Put(stmIndRef, structParent);
}
else
{
// TODO DEVSIX-3351 an error is thrown here because right now no /StructParents will be created.
ILog logger = LogManager.GetLogger(typeof(iText.Kernel.Pdf.Tagging.ParentTreeHandler));
logger.Error(iText.IO.LogMessageConstant.XOBJECT_HAS_NO_STRUCT_PARENTS);
}
pageMcrs.PutXObjectMcr(stmIndRef, mcr);
if (registeringOnInit)
{
xObjectStream.Release();
}
}
else
{
if (mcr is PdfObjRef)
{
PdfDictionary obj = ((PdfDictionary)mcr.GetPdfObject()).GetAsDictionary(PdfName.Obj);
if (obj == null || obj.IsFlushed())
{
throw new PdfException(PdfException.WhenAddingObjectReferenceToTheTagTreeItMustBeConnectedToNotFlushedObject
);
}
PdfNumber n = obj.GetAsNumber(PdfName.StructParent);
if (n != null)
{
pageMcrs.PutObjectReferenceMcr(n.IntValue(), mcr);
}
else
{
throw new PdfException(PdfException.StructParentIndexNotFoundInTaggedObject);
}
}
else
{
pageMcrs.PutPageContentStreamMcr(mcr.GetMcid(), mcr);
}
}
if (!registeringOnInit)
{
structTreeRoot.SetModified();
}
}
/// <summary>Gets an unmodifiable collection of marked content references on page.</summary>
/// <remarks>
/// Gets an unmodifiable collection of marked content references on page.
/// NOTE: Do not remove tags when iterating over returned collection, this could
/// lead to the ConcurrentModificationException, because returned collection is backed by the internal list of the
/// actual page tags.
/// </remarks>
/// <param name="page">
///
/// <see cref="iText.Kernel.Pdf.PdfPage"/>
/// to obtain unmodifiable collection of marked content references
/// </param>
/// <returns>the unmodifiable collection of marked content references on page, if no Mcrs defined returns null
/// </returns>
public virtual ICollection <PdfMcr> GetPageMarkedContentReferences(PdfPage page)
{
ParentTreeHandler.PageMcrsContainer pageMcrs = GetParentTreeHandler().GetPageMarkedContentReferences(page);
return(pageMcrs != null?JavaCollectionsUtil.UnmodifiableCollection(pageMcrs.GetAllMcrsAsCollection()) :
null);
}
