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//------------------------------------------------------------------------------
// <copyright file="ExtensionQuery.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
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; } }
}
}
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