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XmlPredicateBuilder.cs
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60 lines (53 loc) · 2.26 KB
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
namespace Simple.Data.Mocking
{
class XmlPredicateBuilder
{
public static Func<XElement, bool> GetPredicate(SimpleExpression criteria)
{
if (criteria.Type == SimpleExpressionType.And || criteria.Type == SimpleExpressionType.Or)
{
var leftPredicate = GetPredicate((SimpleExpression) criteria.LeftOperand);
var rightPredicate = GetPredicate((SimpleExpression)criteria.RightOperand);
return criteria.Type == SimpleExpressionType.And
? (xml => leftPredicate(xml) && rightPredicate(xml))
: new Func<XElement, bool>(xml => leftPredicate(xml) || rightPredicate(xml));
}
if (criteria.LeftOperand is ObjectReference)
{
var resolver = BuildReferenceResolver((ObjectReference)criteria.LeftOperand);
return xml => Equals(resolver(xml), criteria.RightOperand);
}
return xml => true;
}
private static Func<XElement, object> BuildReferenceResolver(ObjectReference reference)
{
var resolver = BuildElementResolver(reference);
return xml => resolver(xml).TryGetAttribute(reference.GetName()).ConvertValue();
}
private static Func<XElement, XElement> BuildElementResolver(ObjectReference reference)
{
var elementNames = reference.GetAllObjectNames();
if (elementNames.Length == 2)
{
return xml => xml;
}
return BuildNestedElementResolver(elementNames);
}
private static Func<XElement, XElement> BuildNestedElementResolver(IList<string> elementNames)
{
Func<XElement, XElement> resolver = xml => xml.Element(elementNames[1]).Elements().First();
for (int i = 2; i < elementNames.Count - 1; i++)
{
var nested = resolver;
var name = elementNames[i];
resolver = xml => nested(xml).Element(name);
}
return resolver;
}
}
}