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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace MS.Internal.Xml.XPath
{
using System;
using Microsoft.Xml;
using Microsoft.Xml.Xsl;
using Microsoft.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;
_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(ResXml.Xp_NodeSetExpected);
}
if (_queryIterator.CurrentPosition == 0)
{
Advance();
}
return _queryIterator.Current;
}
}
public override XPathNavigator Advance()
{
if (_queryIterator == null)
{
throw XPathException.Create(ResXml.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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