/// <summary>
/// This method compiles an XPath string, if not already saved.
/// Otherwise it returns the available XPath compilation.
/// </summary>
/// <param name="xPath">The XPath string</param>
/// <returns>A compiled XPath expression</returns>
public override XPathExpression Compile(string xPath)
{
XPathExpression expr;
// Compare pointers instead of literal values
if (ReferenceEquals(xPath, NameTable.Get(xPath)))
{
return(CompiledExpressions[xPath]);
}
NameTable.Add(xPath);
CompiledExpressions.Add(xPath, (expr = XPathQueryManager.Compile(xPath)));
return(expr);
}
/// <summary>
/// This method returns an instance of <see cref="XPathQueryManagerCompiledExpressionsDecorator"/>
/// in the context of the first node the XPath expression addresses.
/// </summary>
/// <param name="xPath">The compiled XPath expression</param>
/// <param name="queryParameters">Parameters for the compiled XPath expression</param>
public override IXPathQueryManager?GetXPathQueryManagerInContext(XPathExpression?xPath,
DictionaryEntry[]?queryParameters = null)
{
var xPathQueryManager = (queryParameters == null)
? XPathQueryManager.GetXPathQueryManagerInContext(xPath)
: XPathQueryManager.GetXPathQueryManagerInContext(xPath,
queryParameters);
if (xPathQueryManager == null)
{
return(null);
}
return(new XPathQueryManagerCompiledExpressionsDecorator(xPathQueryManager));
}
/// <summary>
/// This method returns a clone of the current instance.
/// The cloned instance operates on the same (read-only) XPathDocument instance.
/// </summary>
public override IXPathQueryManager Clone()
{
return(new XPathQueryManagerCompiledExpressionsDecorator(XPathQueryManager.Clone()));
}