116 lines
4.3 KiB
C#
116 lines
4.3 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="ExtensionQuery.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">Microsoft</owner>
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//------------------------------------------------------------------------------
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namespace MS.Internal.Xml.XPath {
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using System;
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using System.Xml;
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using System.Xml.Xsl;
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using System.Xml.XPath;
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using System.Diagnostics;
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using System.Globalization;
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using System.Collections;
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internal abstract class ExtensionQuery : Query {
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protected string prefix;
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protected string name;
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protected XsltContext xsltContext;
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private ResetableIterator queryIterator;
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public ExtensionQuery(string prefix, string name) : base() {
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this.prefix = prefix;
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this.name = name;
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}
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protected ExtensionQuery(ExtensionQuery other) : base(other) {
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this.prefix = other.prefix;
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this.name = other.name;
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this.xsltContext = other.xsltContext;
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this.queryIterator = (ResetableIterator)Clone(other.queryIterator);
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}
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public override void Reset() {
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if (queryIterator != null) {
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queryIterator.Reset();
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}
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}
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public override XPathNavigator Current {
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get {
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if (queryIterator == null) {
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throw XPathException.Create(Res.Xp_NodeSetExpected);
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}
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if (queryIterator.CurrentPosition == 0) {
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Advance();
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}
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return queryIterator.Current;
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}
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}
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public override XPathNavigator Advance() {
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if (queryIterator == null) {
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throw XPathException.Create(Res.Xp_NodeSetExpected);
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}
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if (queryIterator.MoveNext()) {
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return queryIterator.Current;
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}
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return null;
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}
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public override int CurrentPosition {
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get {
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if (queryIterator != null) {
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return queryIterator.CurrentPosition;
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}
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return 0;
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}
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}
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protected object ProcessResult(object value) {
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if (value is string ) return value;
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if (value is double ) return value;
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if (value is bool ) return value;
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if (value is XPathNavigator) return value;
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if (value is Int32 ) return (double)(Int32)value;
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if (value == null) {
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queryIterator = XPathEmptyIterator.Instance;
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return this; // We map null to NodeSet to let $null/foo work well.
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}
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ResetableIterator resetable = value as ResetableIterator;
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if (resetable != null) {
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// We need Clone() value because variable may be used several times
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// and they shouldn't
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queryIterator = (ResetableIterator)resetable.Clone();
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return this;
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}
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XPathNodeIterator nodeIterator = value as XPathNodeIterator;
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if (nodeIterator != null) {
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queryIterator = new XPathArrayIterator(nodeIterator);
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return this;
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}
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IXPathNavigable navigable = value as IXPathNavigable;
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if(navigable != null) {
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return navigable.CreateNavigator();
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}
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if (value is Int16 ) return (double)(Int16)value;
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if (value is Int64 ) return (double)(Int64)value;
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if (value is UInt32) return (double)(UInt32)value;
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if (value is UInt16) return (double)(UInt16)value;
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if (value is UInt64) return (double)(UInt64)value;
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if (value is Single) return (double)(Single)value;
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if (value is Decimal) return (double)(Decimal)value;
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return value.ToString();
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}
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protected string QName { get { return prefix.Length != 0 ? prefix + ":" + name : name; } }
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public override int Count { get { return queryIterator == null ? 1 : queryIterator.Count; } }
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public override XPathResultType StaticType { get { return XPathResultType.Any; } }
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}
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}
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