CacheOutputQuery.cs

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using System.Collections.Generic;
using System.Xml.XPath;
using System.Xml.Xsl;
 
namespace MS.Internal.Xml.XPath;
 
internal abstract class CacheOutputQuery : Query
{
    internal Query input;
 
    protected List<XPathNavigator> outputBuffer;
 
    public override XPathNavigator Current
    {
        get
        {
            if (count == 0)
            {
                return null;
            }
            return outputBuffer[count - 1];
        }
    }
 
    public override XPathResultType StaticType => XPathResultType.NodeSet;
 
    public override int CurrentPosition => count;
 
    public override int Count => outputBuffer.Count;
 
    public override QueryProps Properties => (QueryProps)23;
 
    public CacheOutputQuery(Query input)
    {
        this.input = input;
        outputBuffer = new List<XPathNavigator>();
        count = 0;
    }
 
    protected CacheOutputQuery(CacheOutputQuery other)
        : base(other)
    {
        input = Query.Clone(other.input);
        outputBuffer = new List<XPathNavigator>(other.outputBuffer);
        count = other.count;
    }
 
    public override void Reset()
    {
        count = 0;
    }
 
    public override void SetXsltContext(XsltContext context)
    {
        input.SetXsltContext(context);
    }
 
    public override object Evaluate(XPathNodeIterator context)
    {
        outputBuffer.Clear();
        count = 0;
        return input.Evaluate(context);
    }
 
    public override XPathNavigator Advance()
    {
        if (count < outputBuffer.Count)
        {
            return outputBuffer[count++];
        }
        return null;
    }
}