/// <summary>public static string CalculateUri(string base, string inheritedBase, string local)</summary>
/// <param name="localBase">the baseUri from xml:base </param>
/// <param name="inheritedBase">the pushed down baseUri from an outer element</param>
/// <param name="localUri">the Uri value</param>
/// <returns>the absolute Uri to use... </returns>
internal static string CalculateUri(AtomUri localBase, AtomUri inheritedBase, string localUri)
{
try
{
Uri uriBase = null;
Uri uriSuperBase = null;
Uri uriComplete = null;
if (inheritedBase != null && inheritedBase.ToString() != null)
{
uriSuperBase = new Uri(inheritedBase.ToString());
}
if (localBase != null && localBase.ToString() != null)
{
if (uriSuperBase != null)
{
uriBase = new Uri(uriSuperBase, localBase.ToString());
}
else
{
uriBase = new Uri(localBase.ToString());
}
}
else
{
// if no local xml:base, take the passed down one
uriBase = uriSuperBase;
}
if (localUri != null)
{
if (uriBase != null)
{
uriComplete = new Uri(uriBase, localUri.ToString());
}
else
{
uriComplete = new Uri(localUri.ToString());
}
}
else
{
uriComplete = uriBase;
}
return(uriComplete != null ? uriComplete.AbsoluteUri : null);
}
catch (System.UriFormatException)
{
return("Unsupported URI format");
}
}
/// <summary>helper method to encapsulate encoding, uses HTML encoding now</summary>
/// <param name="writer">the xml writer to write to</param>
/// <param name="elementName">the attribute the write</param>
/// <param name="content">the string to encode</param>
static protected void WriteEncodedElementString(XmlWriter writer, string elementName, AtomUri content)
{
if (writer == null)
{
throw new ArgumentNullException("writer");
}
if (Utilities.IsPersistable(content))
{
string encoded = Utilities.EncodeString(content.ToString());
writer.WriteElementString(elementName, BaseNameTable.NSAtom, encoded);
}
}
/// <summary>helper method to encapsulate a string encoding, uses HTML encoding now</summary>
/// <param name="writer">the xml writer to write to</param>
/// <param name="content">the string to encode</param>
static protected void WriteEncodedString(XmlWriter writer, AtomUri content)
{
if (writer == null)
{
throw new System.ArgumentNullException("writer", "No valid xmlWriter");
}
if (Utilities.IsPersistable(content))
{
string encoded = Utilities.EncodeString(content.ToString());
writer.WriteString(encoded);
}
}
/// <summary>Little helper that checks if a string is XML persistable</summary>
public static bool IsPersistable(AtomUri uriString)
{
return(uriString == null ? false : Utilities.IsPersistable(uriString.ToString()));
}
