ExtensionQuery.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / ExtensionQuery.cs / 2 / ExtensionQuery.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
namespace MS.Internal.Xml.XPath { 
    using System;
    using System.Xml; 
    using System.Xml.Xsl;
    using System.Xml.XPath;
    using System.Diagnostics;
    using System.Globalization; 
    using System.Collections;
 
    internal abstract class ExtensionQuery : Query { 
        protected string prefix;
        protected string name; 
        protected XsltContext xsltContext;
        private ResetableIterator queryIterator;

        public ExtensionQuery(string prefix, string name) : base() { 
            this.prefix = prefix;
            this.name   = name; 
        } 
        protected ExtensionQuery(ExtensionQuery other) : base(other) {
            this.prefix      = other.prefix; 
            this.name        = other.name;
            this.xsltContext = other.xsltContext;
            this.queryIterator = (ResetableIterator)Clone(other.queryIterator);
        } 

        public override void Reset() { 
            if (queryIterator != null) { 
                queryIterator.Reset();
            } 
        }

        public override XPathNavigator Current {
            get { 
                if (queryIterator == null) {
                    throw XPathException.Create(Res.Xp_NodeSetExpected); 
                } 
                if (queryIterator.CurrentPosition == 0) {
                    Advance(); 
                }
                return queryIterator.Current;
            }
        } 

        public override XPathNavigator Advance() { 
            if (queryIterator == null) { 
                throw XPathException.Create(Res.Xp_NodeSetExpected);
            } 
            if (queryIterator.MoveNext()) {
                return queryIterator.Current;
            }
            return null; 
        }
 
        public override int CurrentPosition { 
            get {
                if (queryIterator != null) { 
                    return queryIterator.CurrentPosition;
                }
                return 0;
            } 
        }
 
        protected object ProcessResult(object value) { 
            if (value is string        ) return value;
            if (value is double        ) return value; 
            if (value is bool          ) return value;
            if (value is XPathNavigator) return value;
            if (value is Int32         ) return (double)(Int32)value;
 
            if (value == null) {
                queryIterator = XPathEmptyIterator.Instance; 
                return this; // We map null to NodeSet to let $null/foo work well. 
            }
 
            ResetableIterator resetable = value as ResetableIterator;
            if (resetable != null) {
                // We need Clone() value because variable may be used several times
                // and they shouldn't 
                queryIterator = (ResetableIterator)resetable.Clone();
                return this; 
            } 
            XPathNodeIterator nodeIterator = value as XPathNodeIterator;
            if (nodeIterator != null) { 
                queryIterator = new XPathArrayIterator(nodeIterator);
                return this;
            }
            IXPathNavigable navigable = value as IXPathNavigable; 
            if(navigable != null) {
                return navigable.CreateNavigator(); 
            } 

            if (value is Int16 ) return (double)(Int16)value; 
            if (value is Int64 ) return (double)(Int64)value;
            if (value is UInt32) return (double)(UInt32)value;
            if (value is UInt16) return (double)(UInt16)value;
            if (value is UInt64) return (double)(UInt64)value; 
            if (value is Single) return (double)(Single)value;
            if (value is Decimal) return (double)(Decimal)value; 
            return value.ToString(); 
        }
 
        protected string QName { get { return prefix.Length != 0 ? prefix + ":" + name : name; } }

        public override int Count { get { return queryIterator == null ? 1 : queryIterator.Count; } }
        public override XPathResultType StaticType { get { return XPathResultType.Any; } } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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