private static LinqExpression Evaluate(this CompAttributeExpression compAttributeExpression, System.Linq.Expressions.ParameterExpression arg)
{
if (compAttributeExpression == null)
{
throw new ArgumentNullException(nameof(compAttributeExpression));
}
if (arg == null)
{
throw new ArgumentNullException(nameof(arg));
}
var resourceAttrParameterExpr = LinqExpression.Parameter(typeof(RepresentationAttribute), "ra");
var representationAttributesProperty = LinqExpression.Property(arg, "Attributes");
var selection = compAttributeExpression.Path.Evaluate(resourceAttrParameterExpr);
var equalityExpr = GetComparisonExpression(compAttributeExpression, resourceAttrParameterExpr);
var equalExpr = selection;
if (equalityExpr != null)
{
equalExpr = LinqExpression.AndAlso(selection, equalityExpr);
}
var andEqual = GetAttributesAny(equalExpr, arg, resourceAttrParameterExpr);
return(andEqual);
}
private static LinqExpression GetComparisonExpression(CompAttributeExpression compAttributeExpression)
{
if (compAttributeExpression == null)
{
throw new ArgumentNullException(nameof(compAttributeExpression));
}
var resourceAttrParameterExpr = LinqExpression.Parameter(typeof(RepresentationAttribute), "r");
var equalValue = GetComparisonExpression(compAttributeExpression, resourceAttrParameterExpr);
return(LinqExpression.Lambda <Func <RepresentationAttribute, bool> >(equalValue, resourceAttrParameterExpr));
}
private static LinqExpression BuildComparisonExpression(CompAttributeExpression compAttributeExpression, LinqExpression representationAttrExpr)
{
var argSchemaAttrValue = LinqExpression.Parameter(typeof(RepresentationAttributeValue), "rav");
var propertyValue = LinqExpression.Property(representationAttrExpr, "Value");
var propertySchemaAttribute = LinqExpression.Property(representationAttrExpr, "SchemaAttribute");
var propertySchemaType = LinqExpression.Property(propertySchemaAttribute, "Type");
var propertyMultiValued = LinqExpression.Property(propertySchemaAttribute, "MultiValued");
var propertyValues = LinqExpression.Property(representationAttrExpr, "Values");
var propertySchemaAttrValue = LinqExpression.Property(argSchemaAttrValue, "Value");
var equality = LinqExpression.Equal(propertySchemaAttrValue, LinqExpression.Constant(compAttributeExpression.Value));
var callEqualValue = LinqExpression.Lambda <Func <RepresentationAttributeValue, bool> >(equality, argSchemaAttrValue);
var anyExpr = LinqExpression.Call(typeof(Enumerable), _anyMethodName, new[] { typeof(RepresentationAttributeValue) }, propertyValues, callEqualValue);
var itemCount = LinqExpression.Call(typeof(Enumerable), "Count", new[] { typeof(RepresentationAttributeValue) }, propertyValues);
var moreThanZero = LinqExpression.GreaterThan(itemCount, LinqExpression.Constant(0));
var isMultiValued = LinqExpression.Equal(propertyMultiValued, LinqExpression.Constant(true));
var isNotMultiValued = LinqExpression.Equal(propertyMultiValued, LinqExpression.Constant(false));
var equalBoolean = LinqExpression.Equal(propertySchemaType, LinqExpression.Constant(Common.Constants.SchemaAttributeTypes.Boolean));
var equalBinary = LinqExpression.Equal(propertySchemaType, LinqExpression.Constant(Common.Constants.SchemaAttributeTypes.Binary));
var equalString = LinqExpression.Equal(propertySchemaType, LinqExpression.Constant(Common.Constants.SchemaAttributeTypes.String));
var equalDatetime = LinqExpression.Equal(propertySchemaType, LinqExpression.Constant(Common.Constants.SchemaAttributeTypes.DateTime));
var equalDecimal = LinqExpression.Equal(propertySchemaType, LinqExpression.Constant(Common.Constants.SchemaAttributeTypes.Decimal));
var equalInteger = LinqExpression.Equal(propertySchemaType, LinqExpression.Constant(Common.Constants.SchemaAttributeTypes.Integer));
var firstEqualityStr = LinqExpression.OrElse(equalBoolean, equalBinary);
var secondEqualityStr = LinqExpression.OrElse(firstEqualityStr, equalString);
var firstEqualityFloat = LinqExpression.OrElse(equalDatetime, equalDecimal);
var equalityFloat = LinqExpression.OrElse(firstEqualityFloat, equalInteger);
var finalEqualityStr = LinqExpression.OrElse(equalityFloat, secondEqualityStr);
var containsStr = LinqExpression.AndAlso(moreThanZero, anyExpr);
var equalityMultipleStr = LinqExpression.AndAlso(isMultiValued, containsStr);
var contains = typeof(string).GetMethod("Contains");
var containsEqualValue = LinqExpression.Call(propertyValue, contains, LinqExpression.Constant(compAttributeExpression.Value));
var equalityStr = LinqExpression.AndAlso(isNotMultiValued, containsEqualValue);
var checkStrMultiValued = LinqExpression.AndAlso(finalEqualityStr, equalityMultipleStr);
var checkContainsStr = LinqExpression.AndAlso(finalEqualityStr, equalityStr);
return(LinqExpression.OrElse(checkStrMultiValued, checkContainsStr));
}
private static LinqExpression GetComparisonExpression(CompAttributeExpression compAttributeExpression, LinqExpression representationAttrExpr)
{
if (compAttributeExpression == null)
{
throw new ArgumentNullException(nameof(compAttributeExpression));
}
if (representationAttrExpr == null)
{
throw new ArgumentNullException(nameof(representationAttrExpr));
}
var propertySchemaAttribute = LinqExpression.Property(representationAttrExpr, "SchemaAttribute");
var propertySchemaType = LinqExpression.Property(propertySchemaAttribute, "Type");
var propertyValue = LinqExpression.Property(representationAttrExpr, "Value");
var propertyValueNumber = LinqExpression.Property(representationAttrExpr, "ValueNumber");
LinqExpression equalValue = null;
switch (compAttributeExpression.Operator)
{
case ComparisonOperators.eq:
equalValue = LinqExpression.Equal(propertyValue, LinqExpression.Constant(compAttributeExpression.Value));
break;
case ComparisonOperators.pr:
equalValue = LinqExpression.NotEqual(propertyValue, LinqExpression.Constant(null));
break;
case ComparisonOperators.co:
equalValue = BuildComparisonExpression(compAttributeExpression, representationAttrExpr);
break;
case ComparisonOperators.gt:
equalValue = LinqExpression.GreaterThan(propertyValueNumber, LinqExpression.Constant(double.Parse(compAttributeExpression.Value)));
break;
case ComparisonOperators.ge:
equalValue = LinqExpression.GreaterThanOrEqual(propertyValueNumber, LinqExpression.Constant(double.Parse(compAttributeExpression.Value)));
break;
case ComparisonOperators.le:
equalValue = LinqExpression.LessThanOrEqual(propertyValueNumber, LinqExpression.Constant(double.Parse(compAttributeExpression.Value)));
break;
case ComparisonOperators.lt:
equalValue = LinqExpression.LessThan(propertyValueNumber, LinqExpression.Constant(double.Parse(compAttributeExpression.Value)));
break;
case ComparisonOperators.sw:
var startWith = typeof(string).GetMethod("StartsWith");
equalValue = LinqExpression.Call(propertyValue, startWith, LinqExpression.Constant(compAttributeExpression.Value));
break;
case ComparisonOperators.ew:
var endsWith = typeof(string).GetMethod("EndsWith");
equalValue = LinqExpression.Call(propertyValue, endsWith, LinqExpression.Constant(compAttributeExpression.Value));
break;
}
return(equalValue);
}