/**
* Parse the relationship part and add all relationship in this collection.
*
* @param relPart
* The package part to parse.
* @throws InvalidFormatException
* Throws if the relationship part is invalid.
*/
private void ParseRelationshipsPart(PackagePart relPart)
{
try
{
logger.Log(POILogger.DEBUG, "Parsing relationship: " + relPart.PartName);
XPathDocument xmlRelationshipsDoc = DocumentHelper.ReadDocument(relPart.GetInputStream());
// Check OPC compliance M4.1 rule
bool fCorePropertiesRelationship = false;
///xmlRelationshipsDoc.ChildNodes.GetEnumerator();
XPathNavigator xpathnav = xmlRelationshipsDoc.CreateNavigator();
XmlNamespaceManager nsMgr = new XmlNamespaceManager(xpathnav.NameTable);
nsMgr.AddNamespace("x", PackageNamespaces.RELATIONSHIPS);
XPathNodeIterator iterator = xpathnav.Select("//x:" + PackageRelationship.RELATIONSHIP_TAG_NAME, nsMgr);
while (iterator.MoveNext())
{
// Relationship ID
String id = iterator.Current.GetAttribute(PackageRelationship.ID_ATTRIBUTE_NAME, xpathnav.NamespaceURI);
// Relationship type
String type = iterator.Current.GetAttribute(
PackageRelationship.TYPE_ATTRIBUTE_NAME, xpathnav.NamespaceURI);
/* Check OPC Compliance */
// Check Rule M4.1
if (type.Equals(PackageRelationshipTypes.CORE_PROPERTIES))
{
if (!fCorePropertiesRelationship)
{
fCorePropertiesRelationship = true;
}
else
{
throw new InvalidFormatException(
"OPC Compliance error [M4.1]: there is more than one core properties relationship in the package !");
}
}
/* End OPC Compliance */
// TargetMode (default value "Internal")
string targetModeAttr = iterator.Current.GetAttribute(PackageRelationship.TARGET_MODE_ATTRIBUTE_NAME, xpathnav.NamespaceURI);
TargetMode targetMode = TargetMode.Internal;
if (targetModeAttr != string.Empty)
{
targetMode = targetModeAttr.ToLower()
.Equals("internal") ? TargetMode.Internal
: TargetMode.External;
}
// Target converted in URI
Uri target = PackagingUriHelper.ToUri("http://invalid.uri"); // dummy url
String value = iterator.Current.GetAttribute(
PackageRelationship.TARGET_ATTRIBUTE_NAME, xpathnav.NamespaceURI);;
try
{
// when parsing of the given uri fails, we can either
// ignore this relationship, which leads to IllegalStateException
// later on, or use a dummy value and thus enable processing of the
// package
target = PackagingUriHelper.ToUri(value);
}
catch (UriFormatException e)
{
logger.Log(POILogger.ERROR, "Cannot convert " + value
+ " in a valid relationship URI-> dummy-URI used", e);
}
AddRelationship(target, targetMode, type, id);
}
}
catch (Exception e)
{
logger.Log(POILogger.ERROR, e);
throw new InvalidFormatException(e.Message);
}
}