XPathExpression.cs

using MS.Internal.Xml.XPath;
using System.Collections;

namespace System.Xml.XPath
{
    public abstract class XPathExpression
    {
        public abstract string Expression
        {
            get;
        }

        public abstract XPathResultType ReturnType
        {
            get;
        }

        internal XPathExpression()
        {
        }

        public abstract void AddSort(object expr, IComparer comparer);

        public abstract void AddSort(object expr, XmlSortOrder order, XmlCaseOrder caseOrder, string lang, XmlDataType dataType);

        public abstract XPathExpression Clone();

        public abstract void SetContext(XmlNamespaceManager nsManager);

        public abstract void SetContext(IXmlNamespaceResolver nsResolver);

        public static XPathExpression Compile(string xpath)
        {
            return Compile(xpath, null);
        }

        public static XPathExpression Compile(string xpath, IXmlNamespaceResolver nsResolver)
        {
            bool needContext;
            Query query = new QueryBuilder().Build(xpath, out needContext);
            CompiledXpathExpr compiledXpathExpr = new CompiledXpathExpr(query, xpath, needContext);
            if (nsResolver != null)
            {
                compiledXpathExpr.SetContext(nsResolver);
            }
            return compiledXpathExpr;
        }

        private void PrintQuery(XmlWriter w)
        {
            ((CompiledXpathExpr)this).QueryTree.PrintQuery(w);
        }
    }
}