/**
* When an MCID is encountered, the parser will check the list
* structure items and turn an annotation into an XObject if
* necessary.
* @param mcid the MCID that was encountered in the content stream
* @throws IOException
*/
virtual protected void DealWithMcid(PdfNumber mcid)
{
if (mcid == null)
{
return;
}
StructureItem item = items[0];
if (LOGGER.IsLogging(Level.INFO))
{
LOGGER.Info(String.Format("Encountered MCID {0} in content, comparing with {1}", mcid, item));
}
switch (item.CheckMCID(pageref.Number, mcid.IntValue))
{
case 0:
StructureObject obj = (StructureObject)item;
ConvertToXObject(obj);
LOGGER.Info("Removed structure item from stack.");
items.RemoveAt(0);
DealWithMcid(mcid);
return;
case 1:
LOGGER.Info("Removed structure item from stack.");
items.RemoveAt(0);
return;
default:
LOGGER.Warn("MCID not found! There's probably an error in your form!");
// hack to deal with MCIDs that are added in the wrong order
int check;
for (int i = 1; i < items.Count; i++)
{
item = items[i];
check = item.CheckMCID(pageref.Number, mcid.IntValue);
switch (check)
{
case 1:
LOGGER.Info("Removed structure item from stack.");
items.RemoveAt(i);
return;
case 0:
break;
}
}
throw new DocumentException(MessageLocalization.GetComposedMessage("can.t.read.document.structure"));
}
}
/**
* When an XObject with a StructParent is encountered,
* we want to remove it from the stack.
* @param xobj the name of an XObject
*/
protected void DealWithXObj(PdfName xobj)
{
PdfDictionary dict = xobjects.GetAsStream(xobj);
PdfNumber structParent = dict.GetAsNumber(PdfName.STRUCTPARENT);
LOGGER.Info(String.Format("Encountered StructParent {0} in content", structParent));
if (structParent == null)
{
return;
}
StructureItem item = items[0];
if (item.CheckStructParent(pageref.Number, structParent.IntValue) == 1)
{
items.RemoveAt(0);
}
}
/**
* Parses the content of a page, replacing appearances of annotations
* with Form XObjects.
* @param page a page dictionary
* @throws IOException
*/
public void Parse(PdfDictionary page, PdfIndirectReference pageref)
{
LOGGER.Info("Parsing page with reference " + pageref);
// initializing member variables
baos = new MemoryStream();
this.page = page;
this.pageref = pageref;
structParents = page.GetAsNumber(PdfName.STRUCTPARENTS);
if (structParents == null)
{
throw new DocumentException(MessageLocalization.GetComposedMessage("can.t.read.document.structure"));
}
annots = page.GetAsArray(PdfName.ANNOTS);
if (annots == null)
{
annots = new PdfArray();
}
PdfDictionary resources = page.GetAsDict(PdfName.RESOURCES);
xobjects = resources.GetAsDict(PdfName.XOBJECT);
if (xobjects == null)
{
xobjects = new PdfDictionary();
resources.Put(PdfName.XOBJECT, xobjects);
}
// parsing the content stream of the page
PRStream stream = (PRStream)page.GetAsStream(PdfName.CONTENTS);
byte[] contentBytes = PdfReader.GetStreamBytes(stream);
PRTokeniser tokeniser = new PRTokeniser(new RandomAccessFileOrArray(RASFACTORY.CreateSource(contentBytes)));
PdfContentParser ps = new PdfContentParser(tokeniser);
List <PdfObject> operands = new List <PdfObject>();
while (ps.Parse(operands).Count > 0)
{
PdfLiteral opr = (PdfLiteral)operands[operands.Count - 1];
ProcessOperator(opr, operands);
}
// dealing with orphans
while (items.Count > 0 && items[0].GetPageref() == pageref.Number)
{
StructureItem item = items[0];
if (item is StructureObject)
{
ConvertToXObject((StructureObject)item);
items.RemoveAt(0);
}
}
if (annots.Length == 0)
{
page.Remove(PdfName.ANNOTS);
}
else
{
PdfDictionary annot;
for (int i = 0; i < annots.Size; i++)
{
annot = annots.GetAsDict(i);
if (annot.GetAsNumber(PdfName.STRUCTPARENT) == null)
{
throw new DocumentException(MessageLocalization.GetComposedMessage("could.not.flatten.file.untagged.annotations.found"));
}
}
}
// replacing the content stream
baos.Flush();
baos.Close();
stream.SetData(baos.ToArray());
// showing how many items are left
LOGGER.Info(String.Format("There are {0} items left for processing", items.Count));
}
