public override object Evaluate(BaseIterator iter)
{
XsltContext xsltContext = iter.NamespaceManager as XsltContext;
if (xsltContext == null)
{
throw new XPathException(string.Format("XSLT context is required to resolve variable. Current namespace manager in current node-set '{0}' is '{1}'", iter.GetType(), (iter.NamespaceManager == null) ? null : iter.NamespaceManager.GetType()));
}
IXsltContextVariable xsltContextVariable;
if (this.resolvedName)
{
xsltContextVariable = xsltContext.ResolveVariable(this._name);
}
else
{
xsltContextVariable = xsltContext.ResolveVariable(new XmlQualifiedName(this._name.Name, this._name.Namespace));
}
if (xsltContextVariable == null)
{
throw new XPathException("variable " + this._name.ToString() + " not found");
}
object obj = xsltContextVariable.Evaluate(xsltContext);
XPathNodeIterator xpathNodeIterator = obj as XPathNodeIterator;
if (xpathNodeIterator != null)
{
return((!(xpathNodeIterator is BaseIterator)) ? new WrapperIterator(xpathNodeIterator, iter.NamespaceManager) : xpathNodeIterator);
}
return(obj);
}
internal override void SetXsltContext(XsltContext context)
{
if (context == null)
{
throw new XPathException(Res.Xp_UndefinedXsltContext, Prefix, Name);
}
if (xsltContextVariable == null)
{
xsltContextVariable = context.ResolveVariable(Prefix, Name);
Debug.Assert(xsltContextVariable != null, "XSLT has to resolve it or throw exception");
}
else
{
Debug.Assert(xsltContextVariable == context.ResolveVariable(Prefix, Name), "ResolveVariable supposed to return the same VariableAction each time");
}
Object result = xsltContextVariable.Evaluate(context);
if (result is double)
{
_VarQuery = new OperandQuery(result, XPathResultType.Number);
}
else if (result is String)
{
_VarQuery = new OperandQuery(result, XPathResultType.String);
}
else if (result is Boolean)
{
_VarQuery = new OperandQuery(result, XPathResultType.Boolean);
}
else if (result is XPathNavigator)
{
_VarQuery = new NavigatorQuery((XPathNavigator)result);
}
else if (result is ResetableIterator)
{
ResetableIterator it = result as ResetableIterator;
_VarQuery = new XmlIteratorQuery((ResetableIterator)it.Clone());
}
else if (result is XPathNodeIterator)
{
Debug.Assert(false, "Unexpected type of XPathNodeIterator");
throw new NotSupportedException(Res.GetString(Res.XmlUnsupportedType, result.GetType().FullName));
}
else if (result is int)
{
_VarQuery = new OperandQuery(XmlConvert.ToXPathDouble(result), XPathResultType.Number);
}
else
{
if (result == null)
{
throw new XPathException(Res.Xslt_InvalidVariable, Name);
}
Debug.Assert(false, "Unexpected variable type");
throw new NotSupportedException(Res.GetString(Res.XmlUnsupportedType, result.GetType().FullName));
}
Debug.Assert(_VarQuery != null);
}
public override IXsltContextVariable ResolveVariable(string prefix, string name)
{
if (m_AdditionalContext != null)
{
return(m_AdditionalContext.ResolveVariable(prefix, name));
}
else
{
return(null);
}
}
/// <summary>
/// When overridden in a derived class, resolves a variable reference and returns an
/// <see cref="T:System.Xml.Xsl.IXsltContextVariable"/> representing the variable.
/// </summary>
/// <param name="prefix">The prefix of the variable as it appears in the XPath expression.</param>
/// <param name="name">The name of the variable.</param>
/// <returns>
/// An <see cref="T:System.Xml.Xsl.IXsltContextVariable"/> representing the variable at runtime.
/// </returns>
public override IXsltContextVariable ResolveVariable(string prefix, string name)
{
if (_variableResolver != null)
{
var variable = _variableResolver.ResolveVariable(prefix, name);
if (variable != null)
{
return(variable);
}
}
return(_baseContext.ResolveVariable(prefix, name));
}
public override void SetXsltContext(XsltContext context)
{
if (context == null)
{
throw XPathException.Create(SR.Xp_NoContext);
}
if (this.xsltContext != context)
{
xsltContext = context;
_variable = xsltContext.ResolveVariable(prefix, name);
// Since null is allowed for ResolveFunction, allow it for ResolveVariable as well
if (_variable == null)
{
throw XPathException.Create(SR.Xp_UndefVar, QName);
}
}
}
public override IXsltContextVariable ResolveVariable(string prefix, string name)
{
return(context.ResolveVariable(prefix, name));
}
