mcs/class/referencesource/System.Xml/System/Xml/XPath/XPathExpr.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="XPathExpr.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">Microsoft</owner>
   6 //------------------------------------------------------------------------------
   7
   8 namespace System.Xml.XPath {
   9
  10     using System;
  11     using System.Xml;
  12     using System.Collections;
  13     using MS.Internal.Xml.XPath;
  14
  15     public enum XmlSortOrder {
  16         Ascending       = 1,
  17         Descending      = 2,
  18     }
  19
  20     public enum XmlCaseOrder {
  21         None            = 0,
  22         UpperFirst      = 1,
  23         LowerFirst      = 2,
  24     }
  25
  26     public enum XmlDataType {
  27         Text            = 1,
  28         Number          = 2,
  29     }
  30
  31     public enum XPathResultType {
  32         Number         = 0 ,
  33         String          = 1,
  34         Boolean         = 2,
  35         NodeSet        = 3,
  36         Navigator       = XPathResultType.String,
  37         Any            = 5,
  38         Error
  39     };
  40
  41     public abstract class XPathExpression {
  42         internal XPathExpression(){}
  43
  44         public  abstract string Expression { get; }
  45
  46         public abstract void AddSort(object expr, IComparer comparer);
  47
  48         public abstract void AddSort(object expr, XmlSortOrder order, XmlCaseOrder caseOrder, string lang, XmlDataType dataType);
  49
  50         public abstract XPathExpression Clone();
  51
  52         public abstract void SetContext(XmlNamespaceManager nsManager);
  53
  54         public abstract void SetContext(IXmlNamespaceResolver nsResolver);
  55
  56         public abstract XPathResultType ReturnType { get; }
  57
  58         public static XPathExpression Compile(string xpath) {
  59             return Compile(xpath, /*nsResolver:*/null);
  60         }
  61
  62         public static XPathExpression Compile(string xpath, IXmlNamespaceResolver nsResolver) {
  63             bool hasPrefix;
  64             Query query = new QueryBuilder().Build(xpath, out hasPrefix);
  65             CompiledXpathExpr expr = new CompiledXpathExpr(query, xpath, hasPrefix);
  66             if (null != nsResolver) {
  67                 expr.SetContext(nsResolver);
  68             }
  69             return expr;
  70         }
  71
  72         private void PrintQuery(XmlWriter w) {
  73             ((CompiledXpathExpr)this).QueryTree.PrintQuery(w);
  74         }
  75     }
  76 }