/// <summary>
/// Serializes an UnaryExpression to a string
/// </summary>
/// <param name="u">Expression to serialize</param>
/// <returns>UnaryExpression</returns>
internal override Expression VisitUnary(UnaryExpression u)
{
switch (u.NodeType)
{
case ExpressionType.Not:
this.builder.Append(UriHelper.NOT);
this.builder.Append(UriHelper.SPACE);
this.VisitOperand(u.Operand);
break;
case ExpressionType.Negate:
case ExpressionType.NegateChecked:
this.builder.Append(UriHelper.SPACE);
this.builder.Append(UriHelper.NEGATE);
this.VisitOperand(u.Operand);
break;
case ExpressionType.Convert:
case ExpressionType.ConvertChecked:
if (u.Type != typeof(object))
{
this.builder.Append(UriHelper.CAST);
this.builder.Append(UriHelper.LEFTPAREN);
if (!this.IsImplicitInputReference(u.Operand))
{
this.Visit(u.Operand);
this.builder.Append(UriHelper.COMMA);
}
this.builder.Append(UriHelper.QUOTE);
this.builder.Append(UriHelper.GetTypeNameForUri(u.Type, this.context));
this.builder.Append(UriHelper.QUOTE);
this.builder.Append(UriHelper.RIGHTPAREN);
}
else
{
if (!this.IsImplicitInputReference(u.Operand))
{
this.Visit(u.Operand);
}
}
break;
case ExpressionType.TypeAs:
if (u.Operand.NodeType == ExpressionType.TypeAs)
{
throw new NotSupportedException(Strings.ALinq_CannotUseTypeFiltersMultipleTimes);
}
this.Visit(u.Operand);
if (!this.IsImplicitInputReference(u.Operand))
{
// InputReferenceExpressions aren't emitted, so no leading slash is required
this.builder.Append(UriHelper.FORWARDSLASH);
}
UriHelper.AppendTypeSegment(this.builder, u.Type, this.context, this.inPath, ref this.uriVersion);
break;
case ExpressionType.UnaryPlus:
// no-op always ignore.
break;
default:
this.cantTranslateExpression = true;
break;
}
return(u);
}
/// <summary>
/// MethodCallExpression visit method
/// </summary>
/// <param name="m">The MethodCallExpression expression to visit</param>
/// <returns>The visited MethodCallExpression expression </returns>
internal override Expression VisitMethodCall(MethodCallExpression m)
{
string methodName;
if (TypeSystem.TryGetQueryOptionMethod(m.Method, out methodName))
{
this.builder.Append(methodName);
this.builder.Append(UriHelper.LEFTPAREN);
// There is a single function, 'substringof', which reorders its argument with
// respect to the CLR method. Thus handling it as a special case rather than
// using a more general argument reordering mechanism.
if (methodName == "substringof")
{
Debug.Assert(m.Method.Name == "Contains", "m.Method.Name == 'Contains'");
Debug.Assert(m.Object != null, "m.Object != null");
Debug.Assert(m.Arguments.Count == 1, "m.Arguments.Count == 1");
this.Visit(m.Arguments[0]);
this.builder.Append(UriHelper.COMMA);
this.Visit(m.Object);
}
else
{
if (m.Object != null)
{
this.Visit(m.Object);
}
if (m.Arguments.Count > 0)
{
if (m.Object != null)
{
this.builder.Append(UriHelper.COMMA);
}
for (int ii = 0; ii < m.Arguments.Count; ii++)
{
this.Visit(m.Arguments[ii]);
if (ii < m.Arguments.Count - 1)
{
this.builder.Append(UriHelper.COMMA);
}
}
}
}
this.builder.Append(UriHelper.RIGHTPAREN);
}
else
{
SequenceMethod sequenceMethod;
if (ReflectionUtil.TryIdentifySequenceMethod(m.Method, out sequenceMethod))
{
if (ReflectionUtil.IsAnyAllMethod(sequenceMethod))
{
// Raise the uriVersion each time we write any or all methods to the uri.
WebUtil.RaiseVersion(ref this.uriVersion, Util.DataServiceVersion3);
this.Visit(m.Arguments[0]);
this.builder.Append(UriHelper.FORWARDSLASH);
if (sequenceMethod == SequenceMethod.All)
{
this.builder.Append(XmlConstants.AllMethodName);
}
else
{
this.builder.Append(XmlConstants.AnyMethodName);
}
this.builder.Append(UriHelper.LEFTPAREN);
if (sequenceMethod != SequenceMethod.Any)
{
// SequenceMethod.Any represents Enumerable.Any(), which has only source argument
// AnyPredicate and All has a second parameter which is the predicate lambda.
Debug.Assert(m.Arguments.Count() == 2, "m.Arguments.Count() == 2");
LambdaExpression le = (LambdaExpression)m.Arguments[1];
string rangeVariable = le.Parameters[0].Name;
this.builder.Append(rangeVariable);
this.builder.Append(UriHelper.COLON);
this.scopeCount++;
this.Visit(le.Body);
this.scopeCount--;
}
this.builder.Append(UriHelper.RIGHTPAREN);
return(m);
}
else if (sequenceMethod == SequenceMethod.OfType && this.parent != null)
{
// check to see if this is an OfType filter for Any or All.
// e.g. ctx.CreateQuery<Movie>("Movies").Where(m=>m.Actors.OfType<MegaStar>().Any())
// which translates to /Movies()?$filter=Actors/MegaStar/any()
MethodCallExpression mce = this.parent as MethodCallExpression;
if (mce != null &&
ReflectionUtil.TryIdentifySequenceMethod(mce.Method, out sequenceMethod) &&
ReflectionUtil.IsAnyAllMethod(sequenceMethod))
{
Type filteredType = mce.Method.GetGenericArguments().SingleOrDefault();
if (ClientTypeUtil.TypeOrElementTypeIsEntity(filteredType))
{
this.Visit(m.Arguments[0]);
this.builder.Append(UriHelper.FORWARDSLASH);
UriHelper.AppendTypeSegment(this.builder, filteredType, this.context, this.inPath, ref this.uriVersion);
return(m);
}
}
}
}
this.cantTranslateExpression = true;
}
return(m);
}
