private static XmNodeOptions GetNodeOptions(XmlElement xe, string strXPath,
XmContext ctx)
{
XmNodeOptions o = new XmNodeOptions();
ctx.GetNodeOptions(o, strXPath);
o.LoadElementAttributes(xe);
return(o);
}
public static XmElementCollection FromChildNodes(XmlElement xeParent,
string strParentXPath, XmContext ctx)
{
XmElementCollection c = new XmElementCollection();
if (xeParent == null)
{
Debug.Assert(false); return(c);
}
if (strParentXPath == null)
{
Debug.Assert(false); return(c);
}
if (ctx == null)
{
Debug.Assert(false); return(c);
}
Dictionary <string, XmlElement> d = c.m_d;
foreach (XmlNode xn in xeParent.ChildNodes)
{
XmlElement xe = (xn as XmlElement);
if (xe == null)
{
continue;
}
string strNameC = xe.Name;
string strXPathC = strParentXPath + "/" + strNameC;
string strKeyCustomC = ctx.GetNodeKey(xe, strXPathC);
string strKey = BuildNodeKey(strNameC, strKeyCustomC, 0);
if (d.ContainsKey(strKey))
{
// In general, custom node keys should be unique
Debug.Assert(string.IsNullOrEmpty(strKeyCustomC));
for (int i = d.Count; i >= 0; --i)
{
string strKeyTest = BuildNodeKey(strNameC, strKeyCustomC, i);
if (d.ContainsKey(strKeyTest))
{
Debug.Assert(i != d.Count); // Key must change in first iteration
break;
}
strKey = strKeyTest;
}
Debug.Assert(!d.ContainsKey(strKey));
}
c.Add(strKey, xe);
}
return(c);
}
// Old, for plugins
public static void MergeNodes(XmlDocument xd, XmlNode xn, XmlNode xnOverride)
{
XmlElement xeBase = (xn as XmlElement);
XmlElement xeOverride = (xnOverride as XmlElement);
string strXPath = ((xn != null) ? xn.Name : string.Empty);
XmContext ctx = new XmContext(xd,
delegate(XmNodeOptions oP, string strXPathP) { },
delegate(XmlNode xnP, string strXPathP) { return(null); });
MergeElements(xeBase, xeOverride, strXPath, null, ctx);
}
internal static bool IsAlwaysEnforced(XmlNode xn, string strXPath,
XmContext ctx)
{
if (xn == null)
{
Debug.Assert(false); return(false);
}
if (xn.NodeType == XmlNodeType.Document)
{
return(true);
}
// If xn is the document node, strXPath is empty
if (string.IsNullOrEmpty(strXPath))
{
Debug.Assert(false); return(false);
}
if (ctx == null)
{
Debug.Assert(false); return(false);
}
XmlElement xe = (xn as XmlElement);
if (xe == null)
{
Debug.Assert(false); return(false);
}
XmNodeOptions o = GetNodeOptions(xe, strXPath, ctx);
if ((o.NodeMode == XmNodeMode.None) ||
(o.NodeMode == XmNodeMode.Create))
{
return(false);
}
if (o.ContentMode == XmContentMode.None)
{
return(false);
}
XmlNode xnP = xe.ParentNode;
if (xnP == null)
{
Debug.Assert(false); return(false);
}
if (object.ReferenceEquals(xnP, xn))
{
Debug.Assert(false); return(false);
}
int iSep = strXPath.LastIndexOf('/');
if (iSep < 0)
{
Debug.Assert(false); return(false);
}
string strXPathP = strXPath.Substring(0, iSep);
return(IsAlwaysEnforced(xnP, strXPathP, ctx));
}
internal static XmlElement MergeElements(XmlElement xeBase, XmlElement xeOverride,
string strXPath, XmlElement xeBaseParent, XmContext ctx)
{
if (xeOverride == null)
{
throw new ArgumentNullException("xeOverride");
}
if (strXPath == null)
{
throw new ArgumentNullException("strXPath");
}
if (ctx == null)
{
throw new ArgumentNullException("ctx");
}
string strName = xeOverride.Name;
Debug.Assert((xeBase == null) || (xeBase.Name == strName));
Debug.Assert((strXPath == strName) || strXPath.EndsWith("/" + strName));
Debug.Assert((xeBase == null) || (xeBaseParent == null) ||
object.ReferenceEquals(xeBase.ParentNode, xeBaseParent));
XmNodeOptions o = GetNodeOptions(xeOverride, strXPath, ctx);
bool bContinue = false;
switch (o.NodeMode)
{
case XmNodeMode.None: break;
case XmNodeMode.Create:
if ((xeBase == null) && (xeBaseParent != null))
{
xeBase = ctx.BaseDocument.CreateElement(strName);
xeBaseParent.AppendChild(xeBase);
bContinue = true;
}
break;
case XmNodeMode.Open:
if (xeBase != null)
{
bContinue = true;
}
break;
case XmNodeMode.OpenOrCreate:
if (xeBase != null)
{
bContinue = true;
}
else if (xeBaseParent != null)
{
xeBase = ctx.BaseDocument.CreateElement(strName);
xeBaseParent.AppendChild(xeBase);
bContinue = true;
}
break;
case XmNodeMode.Remove:
if (xeBase != null)
{
if (xeBaseParent != null)
{
xeBaseParent.RemoveChild(xeBase);
xeBase = null; // Return value, indicate removal
}
else
{
// Cannot remove element; clear it instead
xeBase.InnerXml = string.Empty;
}
}
break;
default: Debug.Assert(false); break;
}
if (!bContinue)
{
return(xeBase);
}
if (xeBase == null)
{
Debug.Assert(false); return(null);
}
XmContentMode cm = o.ContentMode;
if ((cm == XmContentMode.Merge) && !HasChildElement(xeBase) &&
!HasChildElement(xeOverride))
{
cm = XmContentMode.Replace;
}
XmElementCollection xcBase = null, xcOverride = null;
if (cm == XmContentMode.Merge)
{
xcBase = XmElementCollection.FromChildNodes(xeBase, strXPath, ctx);
xcOverride = XmElementCollection.FromChildNodes(xeOverride, strXPath, ctx);
if (o.ChildrenOtherMode == XmChildrenOtherMode.Remove)
{
List <string> lRemove = new List <string>();
foreach (KeyValuePair <string, XmlElement> kvpBaseC in xcBase)
{
if (xcOverride[kvpBaseC.Key] == null)
{
xeBase.RemoveChild(kvpBaseC.Value);
lRemove.Add(kvpBaseC.Key);
}
}
// Do not simply rebuild xcBase, because indices in
// node keys would change
xcBase = xcBase.Except(lRemove);
}
}
switch (cm)
{
case XmContentMode.None: Debug.Assert(false); break; // Currently unused
case XmContentMode.Merge:
foreach (KeyValuePair <string, XmlElement> kvpOverrideC in xcOverride)
{
string strKeyC = kvpOverrideC.Key;
XmlElement xeBaseC = xcBase[strKeyC];
XmlElement xeOverrideC = kvpOverrideC.Value;
string strXPathC = strXPath + "/" + xeOverrideC.Name;
XmlElement xeBaseCNew = MergeElements(xeBaseC,
xeOverrideC, strXPathC, xeBase, ctx);
if (!object.ReferenceEquals(xeBaseCNew, xeBaseC))
{
Debug.Assert((xeBaseCNew == null) || (xeBaseC == null));
if (xeBaseCNew == null)
{
xcBase.Remove(strKeyC);
}
else
{
xcBase.Add(strKeyC, xeBaseCNew);
}
}
}
break;
case XmContentMode.Replace:
xeBase.InnerXml = SafeInnerXml(xeOverride);
break;
default: Debug.Assert(false); break;
}
if ((cm == XmContentMode.Merge) && (o.ChildrenSortOrder ==
XmChildrenSortOrder.This))
{
xcBase.SortBy(xcOverride);
xcBase.ReorderElementsOf(xeBase);
}
return(xeBase);
}