IQueryable IODataServiceContext.Query(string contentTypeDefinition)
{
this._contentQuery = this._contentManager
.Query()
.ForType(new string[] { contentTypeDefinition })
.ForVersion(VersionOptions.Published);
if (this._includes.Any())
{
var contentItem = this._contentManager.New(contentTypeDefinition);
var contentPartTypes = contentItem
.Parts
.Where(part => this._includes.Contains(part.PartDefinition.Name))
.Select(part => part.GetType());
var expandPartsMethod = typeof(QueryHints)
.GetMethods()
.FirstOrDefault(m => m.IsGenericMethod && m.GetGenericArguments().Count() == contentPartTypes.Count() && m.Name == "ExpandParts");
if (null != expandPartsMethod)
{
expandPartsMethod = expandPartsMethod.MakeGenericMethod(contentPartTypes.ToArray());
var queryHints = (QueryHints)expandPartsMethod.Invoke(new QueryHints(), new object[] { });
this._contentQuery.WithQueryHints(queryHints);
}
}
var memberExpression = MemberExpression.Property(MemberExpression.Constant(this), typeof(ODataServiceContext), "Query");
return((this as IQueryProvider).CreateQuery <ContentItem>(memberExpression));
}
private static Expression GenerateRuleDecisionExpression(List <RuleDecisionElement> decisions, ref ParameterExpression parameterExpression)
{
List <Expression> blockExpressions = new List <Expression>();
foreach (var decision in decisions)
{
var memberExpression = MemberExpression.Property(parameterExpression, decision.PropertyName);
var constantExpression = MemberExpression.Constant(decision.Value, typeof(string));
blockExpressions.Add(Expression.Assign(memberExpression, constantExpression));
}
return(Expression.Block(blockExpressions));
}
private static Expression <Func <TContext, bool> > GenerateRuleExpression(RuleElement rule)
{
try
{
var parameterExpression = Expression.Parameter(typeof(TContext), "obj");
List <Expression> blockExpressions = new List <Expression>();
// Build Evaluation rules
Expression finalBinaryExpression = Expression.Constant(true);
var evaluations = rule.RuleEvaluations.Cast <RuleEvaluationElement>().ToList();
var decisions = rule.RuleDecisions.Cast <RuleDecisionElement>().ToList();
evaluations
.ForEach(ruleEvaluation =>
{
var memberExpression = MemberExpression.Property(parameterExpression, ruleEvaluation.PropertyName);
var constantExpression = MemberExpression.Constant(ruleEvaluation.Value, typeof(string));
ExpressionType binaryExpressionType;
if (ExpressionType.TryParse(ruleEvaluation.Criteria, true, out binaryExpressionType))
{
var binaryExpression = Expression.MakeBinary(binaryExpressionType, memberExpression, constantExpression);
finalBinaryExpression = Expression.And(finalBinaryExpression, binaryExpression);
}
});
var conditionalExpression = Expression.IfThen(finalBinaryExpression, GenerateRuleDecisionExpression(decisions, ref parameterExpression));
blockExpressions.Add(conditionalExpression);
LabelTarget returnTarget = Expression.Label(typeof(bool));
blockExpressions.Add(Expression.Return(returnTarget, Expression.Constant(true), typeof(bool)));
blockExpressions.Add(Expression.Label(returnTarget, Expression.Constant(true)));
BlockExpression lambdaBodyExpression = Expression.Block(blockExpressions);
// Compile and return
var lambdaExpression = Expression.Lambda <Func <TContext, bool> >(lambdaBodyExpression, parameterExpression);
return(lambdaExpression);
}
catch (Exception)
{
throw;
}
}
