/// <summary>
/// 访问指定的方法
/// </summary>
/// <param name="theEntityType">实体的类型</param>
/// <param name="m">访问方法调用相关的表达式</param>
/// <param name="tableAlias">表的别名</param>
/// <param name="colConditionParts">存储条件节点的栈</param>
/// <param name="colParameterNames">存储参数名称的列表</param>
/// <param name="colDbTypes">存储数据库字段类型的列表</param>
/// <param name="colArguments">存储条件值的列表</param>
public static void Visit(Type theEntityType, MethodCallExpression m, string tableAlias, Stack<string> colConditionParts, List<string> colParameterNames, List<DbType> colDbTypes, List<object> colArguments)
{
if (m.Object is MemberExpression)
{
//类似n.Name.StartsWith("吴")这样的调用
if (m.Object.Type == typeof(string))
{
StringMethodCallVisitor.Visit(theEntityType, m, tableAlias, colConditionParts, colParameterNames, colDbTypes, colArguments);
}
else
{
throw new Exception("暂不支持{" + m.ToString() + "}的调用!");
}
}
else if (m.Object is ConstantExpression)
{
//类似"ABCD".Contains(n.Name)这样的调用
var cons = m.Object as ConstantExpression;
if (cons.Type == typeof(string))
{
StringMethodCallVisitor.Visit(theEntityType, m, tableAlias, colConditionParts, colParameterNames, colDbTypes, colArguments);
}
else
{
throw new Exception("暂不支持{" + m.ToString() + "}的调用!");
}
}
else
{
throw new Exception("暂不支持{" + m.ToString() + "}的调用!");
}
}
public Expression Bind(ProjectionExpression projection, ProjectionBindingContext context, MethodCallExpression node, IEnumerable<Expression> arguments)
{
var collectionLambda = ExtensionExpressionVisitor.GetLambda(arguments.First());
var binder = new AccumulatorBinder(context.GroupMap, context.SerializerRegistry);
binder.RegisterParameterReplacement(collectionLambda.Parameters[0], projection.Projector);
var collectionSelector = binder.Bind(collectionLambda.Body) as SerializationExpression;
if (collectionSelector == null)
{
var message = string.Format("Unable to determine the collection selector in the tree: {0}", node.ToString());
throw new NotSupportedException(message);
}
var collectionArraySerializer = collectionSelector.SerializationInfo.Serializer as IBsonArraySerializer;
BsonSerializationInfo collectionItemSerializationInfo;
if (collectionArraySerializer == null || !collectionArraySerializer.TryGetItemSerializationInfo(out collectionItemSerializationInfo))
{
var message = string.Format("The collection selector's serializer must implement IBsonArraySerializer: {0}", node.ToString());
throw new NotSupportedException(message);
}
Expression resultSelector;
if (arguments.Count() == 2)
{
var resultLambda = ExtensionExpressionVisitor.GetLambda(arguments.Last());
binder.RegisterParameterReplacement(resultLambda.Parameters[0], projection.Projector);
binder.RegisterParameterReplacement(
resultLambda.Parameters[1],
new SerializationExpression(
resultLambda.Parameters[1],
collectionItemSerializationInfo.WithNewName(collectionSelector.SerializationInfo.ElementName)));
resultSelector = binder.Bind(resultLambda.Body);
}
else
{
resultSelector = new SerializationExpression(
collectionSelector,
collectionItemSerializationInfo.WithNewName(collectionSelector.SerializationInfo.ElementName));
}
var projector = BuildProjector(resultSelector, context);
return new ProjectionExpression(
new SelectManyExpression(
projection.Source,
collectionSelector,
resultSelector),
projector);
}
protected override Expression VisitMethodCall(MethodCallExpression node)
{
Expression retExpr = null;
if (node.Method.Name == _functionName)
{
var str = node.ToString();
MethodCall call;
if (_methodCalls.TryGetValue(str, out call))
{
++call.CallCount;
}
else
{
call = new MethodCall(node, Expression.Parameter(node.Type, "param" + (_methodCalls.Count)));
_methodCalls.Add(str, call);
}
retExpr = call.Parameter;
}
else
retExpr = base.VisitMethodCall(node);
return retExpr;
}
protected override Expression VisitMethodCall(MethodCallExpression m)
{
string s = m.ToString();
// VB.net : e.g. CompareString(x.NoCase, "Me 4", False)
if(s.StartsWith("CompareString"))
{
var left = m.Arguments[0];
// Removes dot if any
var leftStr = left.ToString().Substring(left.ToString().IndexOf('.') + 1);
var right = m.Arguments[1].ToString().Replace("\"", String.Empty);
RDBExpression exp = RDBExpression.Equal;
_bitmap.Push(qexpression("" + leftStr, exp, right));
return null;
}
string mc = s.Substring(s.IndexOf('.') + 1);
if (mc.Contains("Between"))
{
// TODO : add code for between parsing here
string name = m.Arguments[0].ToString().Split('.')[1];
object from = GetValueForMember(m.Arguments[1]);
object to = GetValueForMember(m.Arguments[2]);
//var bits = qfromto(name, from, to);
}
else
_stack.Push(mc);
return m;
}
internal override Expression VisitMethodCall(MethodCallExpression m)
{
/*
if ((m.Object != null && ProjectionAnalyzer.IsDisallowedExpressionForMethodCall(m.Object))
|| m.Arguments.Any(a => ProjectionAnalyzer.IsDisallowedExpressionForMethodCall(a)))
{
throw new NotSupportedException(string.Format(SR.ALinqExpressionNotSupportedInProjection, this.type, m.ToString()));
}
*/
if (ProjectionAnalyzer.IsMethodCallAllowedEntitySequence(m))
{
ProjectionAnalyzer.CheckChainedSequence(m, this.type);
return base.VisitMethodCall(m);
}
throw new NotSupportedException(string.Format(CultureInfo.CurrentCulture, SR.ALinqExpressionNotSupportedInProjectionToEntity, this.type, m.ToString()));
}
/// <summary>
/// Translate the method call
/// </summary>
/// <param name="expr"></param>
/// <param name="result"></param>
/// <param name="gc"></param>
/// <param name="context"></param>
/// <returns></returns>
public IValue CodeMethodCall(MethodCallExpression expr, IGeneratedQueryCode gc, CompositionContainer container)
{
Init();
///
/// First see if we can't locate the method call that at least matches in names
///
var matchingMethodNames = from kt in _knownTypes
where kt.Name == expr.Method.DeclaringType.Name
from m in kt.Methods
where m.Name == expr.Method.Name
select new
{
theType = kt,
theMethod = m
};
///
/// Next, match with the arguments
///
var matchingMethod = from m in matchingMethodNames
where m.theMethod.Arguments.Length == expr.Arguments.Count
where m.theMethod.Arguments.Zip(expr.Arguments, (us, them) => new Tuple<KnownTypeInfo.MechodArg, Expression>(us, them)).All(apair => apair.Item1.Type == apair.Item2.Type.FullName)
select m;
///
/// Ok, at this point, we should have only one guy. If we have more then just choose the first
///
var method = matchingMethod.FirstOrDefault();
if (method == null)
throw new ArgumentException("Could not find a matching method to translate for the call " + expr.ToString());
///
/// And now translate the call
///
StringBuilder rawValue = new StringBuilder();
rawValue.Append(method.theMethod.CPPName);
rawValue.Append("(");
bool first = true;
var dependents = Enumerable.Empty<IDeclaredParameter>();
foreach (var arg in expr.Arguments.Zip(method.theMethod.Arguments, (m, a) => Tuple.Create(m, a)))
{
if (!first)
rawValue.Append(",");
first = false;
var e = ExpressionToCPP.InternalGetExpression(arg.Item1, gc, null, container);
rawValue.AppendFormat("({0}){1}", arg.Item2.CPPType, e.RawValue);
dependents = dependents.Concat(e.Dependants);
}
rawValue.Append(")");
var result = new ValSimple(rawValue.ToString(), expr.Type, dependents);
///
/// Include files
///
foreach (var ifile in method.theMethod.IncludeFiles)
{
gc.AddIncludeFile(ifile);
}
///
/// We aren't re-writing this expression, so just return it.
///
return result;
}
/// <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, 'contains', 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 == "contains")
{
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.Object);
this.builder.Append(UriHelper.COMMA);
this.Visit(m.Arguments[0]);
}
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 if (m.Method.Name == "HasFlag")
{
Debug.Assert(m.Method.Name == "HasFlag", "m.Method.Name == 'HasFlag'");
Debug.Assert(m.Object != null, "m.Object != null");
Debug.Assert(m.Arguments.Count == 1, "m.Arguments.Count == 1");
this.Visit(m.Object);
this.builder.Append(UriHelper.SPACE);
this.builder.Append(UriHelper.HAS);
this.builder.Append(UriHelper.SPACE);
this.Visit(m.Arguments[0]);
}
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.ODataVersion4);
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;
}
}
}
else if (sequenceMethod == SequenceMethod.Count && this.parent != null)
{
if (m.Arguments.Any() && m.Arguments[0] != null)
{
this.Visit(m.Arguments[0]);
}
this.builder.Append(UriHelper.FORWARDSLASH).Append(UriHelper.DOLLARSIGN).Append(UriHelper.COUNT);
return m;
}
}
else
{
if (m.Object != null)
{
this.Visit(m.Object);
}
if (m.Method.Name != "GetValue" && m.Method.Name != "GetValueAsync")
{
this.builder.Append(UriHelper.FORWARDSLASH);
// writing functions in query options
writingFunctionsInQuery = true;
string declaringType = this.context.ResolveNameFromTypeInternal(m.Method.DeclaringType);
if (string.IsNullOrEmpty(declaringType))
{
throw new NotSupportedException(Strings.ALinq_CantTranslateExpression(m.ToString()));
}
int index = declaringType.LastIndexOf('.');
string fullNamespace = declaringType.Remove(index + 1);
string serverMethodName = ClientTypeUtil.GetServerDefinedName(m.Method);
this.builder.Append(fullNamespace + serverMethodName);
this.builder.Append(UriHelper.LEFTPAREN);
string[] argumentNames = m.Method.GetParameters().Select(p => p.Name).ToArray();
for (int i = 0; i < m.Arguments.Count; ++i)
{
this.builder.Append(argumentNames[i]);
this.builder.Append(UriHelper.EQUALSSIGN);
this.scopeCount++;
this.Visit(m.Arguments[i]);
this.scopeCount--;
this.builder.Append(UriHelper.COMMA);
}
if (m.Arguments.Any())
{
this.builder.Remove(this.builder.Length - 1, 1);
}
this.builder.Append(UriHelper.RIGHTPAREN);
writingFunctionsInQuery = false;
}
return m;
}
this.cantTranslateExpression = true;
}
return m;
}
/// <summary>
/// Process a Contains method call which does not map one-to-one on an odata supported method.
/// </summary>
/// <param name="expression">
/// The expression to visit.
/// </param>
/// <returns>
/// The visited expression.
/// </returns>
private void VisitContainsMethodCall(MethodCallExpression expression)
{
IEnumerable<Expression> arguments = GetFilterMethodArguments(expression, expression.Method.Name, expression.Method.IsGenericMethod);
//First argument should be a enumerable of constants
// if you would like to do a enumerable.select().where..
// you should do that outside of the query for now
IEnumerable enumerable = null;
Expression expr = arguments.FirstOrDefault();
if (expr != null && expr is ConstantExpression)
{
enumerable = ((ConstantExpression)expr).Value as IEnumerable;
}
Expression comparand = arguments.Skip(1).FirstOrDefault();
if (enumerable != null && comparand != null)
{
List<object> elements = enumerable.OfType<object>().ToList();
if(elements.Count > 0)
{
// create our rewritten expression tree
// by tranforming the contains into a concatenation of 'or' expressions
Expression orExpression = elements.Select(o => Expression.Equal(comparand, Expression.Constant(o)))
.Aggregate((e1, e2) => Expression.OrElse(e1, e2));
this.Visit(orExpression);
}
}
else
{
throw new NotSupportedException(
string.Format(
CultureInfo.InvariantCulture,
Resources.FilterBuildingExpressionVisitor_UnsupportedInWhereExpression,
expression != null ? expression.ToString() : null));
}
}
internal override Expression VisitMethodCall(MethodCallExpression m)
{
if ((m.Object != null && IsDisallowedExpressionForMethodCall(m.Object))
|| m.Arguments.Any(a => IsDisallowedExpressionForMethodCall(a)))
{
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
if (ProjectionAnalyzer.IsMethodCallAllowedEntitySequence(m))
{
CheckChainedSequence(m, this.type);
// allow selects for following pattern:
// Orders = c.Orders.Select(o=> new NarrowOrder {...}).ToList();
return base.VisitMethodCall(m);
}
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjectionToEntity(this.type, m.ToString()));
}
protected override Expression VisitMethodCall(MethodCallExpression m)
{
string s = m.ToString();
sb.Append(s.Substring(s.IndexOf('.') + 1));
return m;
}
internal override Expression VisitMethodCall(MethodCallExpression m)
{
if ((m.Object != null && IsDisallowedExpressionForMethodCall(m.Object))
|| m.Arguments.Any(a => IsDisallowedExpressionForMethodCall(a)))
{
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
if (ProjectionAnalyzer.IsMethodCallAllowedEntitySequence(m))
{
CheckChainedSequence(m, this.type);
return base.VisitMethodCall(m);
}
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjectionToEntity(this.type, m.ToString()));
}
protected override Expression VisitMethodCall(MethodCallExpression e)
{
if (e.Method.DeclaringType == typeof(StringQueryExtensions))
return VisitStringQxMethodCall(e);
if (e.Method.DeclaringType == typeof(string))
return VisitStringMethodCall(e);
if (e.Method.DeclaringType == typeof(EnumerableQueryExtensions))
return VisitEnumerableQxMethodCall(e);
try
{
var value = e.Evaluate();
var constant = Expression.Constant(value);
Visit(constant);
}
catch (Exception ex)
{
throw new NotSupportedException(
ExceptionMessages.LambdaParser_UnsupportedMethodCall.Inject(e.ToString()), ex);
}
return e;
}
/// <summary>
/// Process method calls which do not map one-to-one on an odata supported method.
/// Currently we only support Contains.
/// </summary>
/// <param name="expression">
/// The expression to visit.
/// </param>
private void VisitCustomMethodCall(MethodCallExpression expression)
{
if (expression.Method.Name.Equals("Contains"))
{
this.VisitContainsMethodCall(expression);
}
else
{
throw new NotSupportedException(
string.Format(
CultureInfo.InvariantCulture,
"'{0}' is not supported in a 'Where' Mobile Services query expression.",
expression != null ? expression.ToString() : null));
}
}
protected override Expression VisitMethodCall(MethodCallExpression m)
{
string s = m.ToString();
string mc = s.Substring(s.IndexOf('.') + 1);
if (mc.Contains("Between"))
{
// TODO : add code for between parsing here
string name = m.Arguments[0].ToString().Split('.')[1];
object from = GetValueForMember(m.Arguments[1]);
object to = GetValueForMember(m.Arguments[2]);
//var bits = qfromto(name, from, to);
}
else
_stack.Push(mc);
return m;
}
private Expression GetAccumulatorArgument(MethodCallExpression node)
{
switch (node.Method.Name)
{
case "Count":
case "LongCount":
if (node.Arguments.Count == 1)
{
return Expression.Constant(1);
}
break;
case "Average":
case "Min":
case "Max":
case "Sum":
if (node.Arguments.Count == 2)
{
return GetLambda(node.Arguments[1]).Body;
}
else if (node.Arguments.Count == 1)
{
return GetBodyFromSelector(node);
}
break;
case "First":
case "Last":
// we have already normalized First/Last calls to only have 1 argument...
if (node.Arguments.Count == 1)
{
return GetBodyFromSelector(node);
}
break;
case "Select":
if (node.Arguments.Count == 2)
{
return GetLambda(node.Arguments[1]).Body;
}
break;
case "Distinct":
case "ToArray":
case "ToList":
if (node.Arguments.Count == 1)
{
return GetBodyFromSelector(node);
}
break;
}
var message = string.Format("Unsupported version of accumulator method {0} in the expression tree: {1}.",
node.Method.Name,
node.ToString());
throw new NotSupportedException(message);
}
internal override Expression VisitMethodCall(MethodCallExpression m)
{
if (ProjectionAnalyzer.IsMethodCallAllowedEntitySequence(m))
{
ProjectionAnalyzer.CheckChainedSequence(m, this.type);
return base.VisitMethodCall(m);
}
if ((m.Object != null ? CommonUtil.IsClientType(m.Object.Type) : false)
|| m.Arguments.Any(a => CommonUtil.IsClientType(a.Type)))
{
throw new NotSupportedException(string.Format(CultureInfo.CurrentCulture, SR.ALinqExpressionNotSupportedInProjection, this.type, m.ToString()));
}
return base.VisitMethodCall(m);
}
private BsonValue TranslateMethodCall(MethodCallExpression node)
{
BsonValue result;
if (node.Object == null)
{
if (node.Method.DeclaringType == typeof(string)
&& TryTranslateStaticStringMethodCall(node, out result))
{
return result;
}
if (node.Method.DeclaringType == typeof(Math)
&& TryTranslateStaticMathMethodCall(node, out result))
{
return result;
}
}
else
{
if (node.Object.Type == typeof(string)
&& TryTranslateStringMethodCall(node, out result))
{
return result;
}
if (node.Object.Type.IsGenericType
&& node.Object.Type.GetGenericTypeDefinition() == typeof(HashSet<>)
&& TryTranslateHashSetMethodCall(node, out result))
{
return result;
}
if (node.Method.Name == "CompareTo"
&& (node.Object.Type.ImplementsInterface(typeof(IComparable<>))
|| node.Object.Type.ImplementsInterface(typeof(IComparable))))
{
return new BsonDocument("$cmp", new BsonArray(new[] { TranslateValue(node.Object), TranslateValue(node.Arguments[0]) }));
}
if (node.Method.Name == "Equals"
&& node.Arguments.Count == 1)
{
return new BsonDocument("$eq", new BsonArray(new[] { TranslateValue(node.Object), TranslateValue(node.Arguments[0]) }));
}
}
var message = string.Format("{0} of type {1} is not supported in the expression tree {2}.",
node.Method.Name,
node.Method.DeclaringType,
node.ToString());
throw new NotSupportedException(message);
}
internal override Expression VisitMethodCall(MethodCallExpression m)
{
// We throw NotSupportedException when IsDisallowedExceptionForMethodCall() is true
// or we have a method call on a non-entity type, for example c.MyCollectionComplexProperty.Select(...)
if ((m.Object != null && (IsDisallowedExpressionForMethodCall(m.Object, this.context.Model) || !ClientTypeUtil.TypeOrElementTypeIsEntity(m.Object.Type)))
|| m.Arguments.Any(a => IsDisallowedExpressionForMethodCall(a, this.context.Model))
|| (m.Object == null && !ClientTypeUtil.TypeOrElementTypeIsEntity(m.Arguments[0].Type)))
{
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
if (ProjectionAnalyzer.IsMethodCallAllowedEntitySequence(m))
{
CheckChainedSequence(m, this.type);
// allow selects for following pattern:
// Orders = c.Orders.Select(o=> new NarrowOrder {...}).ToList();
return base.VisitMethodCall(m);
}
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjectionToEntity(this.type, m.ToString()));
}
/// <summary>
/// Checks whether the specified <see cref="MethodCallExpression"/> refers
/// to a Select method call that works on the results of another Select call
/// </summary>
/// <param name="call">Method call expression to check.</param>
/// <param name="type">Type of the projection</param>
internal static void CheckChainedSequence(MethodCallExpression call, Type type)
{
if (ReflectionUtil.IsSequenceMethod(call.Method, SequenceMethod.Select))
{
// Chained Selects are not allowed
// c.Orders.Select(...).Select(...)
MethodCallExpression insideCall = ResourceBinder.StripTo<MethodCallExpression>(call.Arguments[0]);
if (insideCall != null && ReflectionUtil.IsSequenceMethod(insideCall.Method, SequenceMethod.Select))
{
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjection(type, call.ToString()));
}
}
}
internal override Expression VisitMethodCall(MethodCallExpression m)
{
if (((m.Object != null) && ProjectionAnalyzer.IsDisallowedExpressionForMethodCall(m.Object, this.context.MaxProtocolVersion)) || m.Arguments.Any<Expression>(a => ProjectionAnalyzer.IsDisallowedExpressionForMethodCall(a, this.context.MaxProtocolVersion)))
{
throw new NotSupportedException(System.Data.Services.Client.Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
ProjectionAnalyzer.CheckChainedSequence(m, this.type);
if (!ProjectionAnalyzer.IsMethodCallAllowedEntitySequence(m) && (((m.Object != null) ? ClientTypeUtil.TypeOrElementTypeIsEntity(m.Object.Type) : false) || m.Arguments.Any<Expression>(a => ClientTypeUtil.TypeOrElementTypeIsEntity(a.Type))))
{
throw new NotSupportedException(System.Data.Services.Client.Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
return base.VisitMethodCall(m);
}
internal override Expression VisitMethodCall(MethodCallExpression m)
{
if ((m.Object != null && IsDisallowedExpressionForMethodCall(m.Object))
|| m.Arguments.Any(a => IsDisallowedExpressionForMethodCall(a)))
{
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
if (ProjectionAnalyzer.IsMethodCallAllowedEntitySequence(m))
{
CheckChainedSequence(m, this.type);
// allow IEnum.Select and IEnum.ToList even if entity type.
return base.VisitMethodCall(m);
}
if ((m.Object != null ? ClientType.CheckElementTypeIsEntity(m.Object.Type) : false)
|| m.Arguments.Any(a => ClientType.CheckElementTypeIsEntity(a.Type)))
{
throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjection(this.type, m.ToString()));
}
return base.VisitMethodCall(m);
}
internal static void CheckChainedSequence(MethodCallExpression call, Type type)
{
if (ReflectionUtil.IsSequenceSelectMethod(call.Method))
{
MethodCallExpression expression = ResourceBinder.StripTo<MethodCallExpression>(call.Arguments[0]);
if ((expression != null) && ReflectionUtil.IsSequenceSelectMethod(expression.Method))
{
throw new NotSupportedException(System.Data.Services.Client.Strings.ALinq_ExpressionNotSupportedInProjection(type, call.ToString()));
}
}
}
/// <summary>
/// Process method calls which do not map one-to-one on an odata supported method.
/// Currently we only support Contains.
/// </summary>
/// <param name="expression">
/// The expression to visit.
/// </param>
private void VisitCustomMethodCall(MethodCallExpression expression)
{
if (expression.Method.Name.Equals("Contains"))
{
this.VisitContainsMethodCall(expression);
}
else
{
throw new NotSupportedException(
string.Format(
CultureInfo.InvariantCulture,
Resources.FilterBuildingExpressionVisitor_UnsupportedInWhereExpression,
expression != null ? expression.ToString() : null));
}
}
/// <summary>
/// 访问指定的方法
/// </summary>
/// <param name="theEntityType">实体的类型</param>
/// <param name="m">访问方法调用相关的表达式</param>
/// <param name="tableAlias">表的别名</param>
/// <param name="colConditionParts">存储条件节点的栈</param>
/// <param name="colParameterNames">存储参数名称的列表</param>
/// <param name="colDbTypes">存储数据库字段类型的列表</param>
/// <param name="colArguments">存储条件值的列表</param>
public static void Visit(Type theEntityType, MethodCallExpression m, string tableAlias,
Stack<string> colConditionParts, List<string> colParameterNames, List<DbType> colDbTypes,
List<object> colArguments)
{
string methodName = m.Method.Name;
if (m.Object is MemberExpression)
{
string condition = null;
//string memberName = GetMemberName(m.Object as MemberExpression, out theDbType);
string memberName = EntityMappingTool.GetDbColumnName(theEntityType,
((MemberExpression) m.Object).Member.Name);
DbType theDbType = EntityMappingTool.GetDbColumnType(theEntityType,
((MemberExpression) m.Object).Member.Name);
string parameterName = GetParameterName(colParameterNames, memberName, tableAlias);
switch (methodName)
{
case "Contains":
condition = string.Format("({0}.[{1}] like {2})", tableAlias, memberName, parameterName);
colConditionParts.Push(condition);
colParameterNames.Add(parameterName);
colDbTypes.Add(theDbType);
colArguments.Add("%" + GetArgumentValue(m.Arguments[0] as ConstantExpression) + "%");
break;
case "StartsWith":
condition = string.Format("({0}.[{1}] like {2})", tableAlias, memberName, parameterName);
colConditionParts.Push(condition);
colParameterNames.Add(parameterName);
colDbTypes.Add(theDbType);
colArguments.Add(GetArgumentValue(m.Arguments[0] as ConstantExpression) + "%");
break;
case "EndsWith":
condition = string.Format("({0}.[{1}] like {2})", tableAlias, memberName, parameterName);
colConditionParts.Push(condition);
colParameterNames.Add(parameterName);
colDbTypes.Add(theDbType);
colArguments.Add("%" + GetArgumentValue(m.Arguments[0] as ConstantExpression));
break;
default:
throw new EntitySqlException("暂不支持{" + m.ToString() + "}的调用！");
}
}
else if (m.Object is ConstantExpression)
{
string condition = null;
string memberName = EntityMappingTool.GetDbColumnName(theEntityType,
((MemberExpression) m.Arguments[0]).Member.Name);
DbType theDbType = EntityMappingTool.GetDbColumnType(theEntityType,
((MemberExpression) m.Arguments[0]).Member.Name);
string parameterName = GetParameterName(colParameterNames, memberName, tableAlias);
switch (methodName)
{
case "Contains":
condition = string.Format("(CHARINDEX({0},{1}.[{2}])>0)", parameterName, tableAlias, memberName);
colConditionParts.Push(condition);
colParameterNames.Add(parameterName);
colDbTypes.Add(theDbType);
colArguments.Add(GetArgumentValue(m.Object as ConstantExpression));
break;
case "StartsWith":
condition = string.Format("(CHARINDEX({0},{1}.[{2}])=1)", parameterName, tableAlias, memberName);
colConditionParts.Push(condition);
colParameterNames.Add(parameterName);
colDbTypes.Add(theDbType);
colArguments.Add(GetArgumentValue(m.Object as ConstantExpression));
break;
default:
throw new EntitySqlException("暂不支持{" + m.ToString() + "}的调用！");
}
}
else
{
throw new EntitySqlException("暂不支持{" + m.ToString() + "}的调用！");
}
}
private string TranslateMethodCall(MethodCallExpression node)
{
var methodName = node.Method.Name;
MemberExpression leftExpression = null;
var arguments = new List<LambdaExpression>();
if (node.Method.DeclaringType == typeof(string))
{
string arg = Translate(node.Object);
object[] stringArguments = node.Arguments.Select(UnQuote).OfType<ConstantExpression>().Select(exp => exp.Value).ToArray();
switch (methodName)
{
case "StartsWith":
return string.Format("({0} like {1})", arg, CreateParameter(stringArguments[0] + "%"));
case "EndsWith":
return string.Format("({0} like {1})", arg, CreateParameter("%" + stringArguments[0]));
case "Contains":
return string.Format("({0} like {1})", arg, CreateParameter("%" + stringArguments[0] + "%"));
case "Trim":
return string.Format(_sqlDialect.SqlFunction(SqlDialect.Function.Trim), stringArguments[0]);
}
throw new SqlExpressionTranslatorException(node.ToString());
}
if (node.Method.DeclaringType.IsConstructedGenericType && node.Method.DeclaringType.GetGenericTypeDefinition() == typeof(IDataSet<>))
{
leftExpression = node.Object as MemberExpression;
arguments.AddRange(node.Arguments.Select(UnQuote).OfType<LambdaExpression>());
}
if (node.Method.DeclaringType == typeof(Enumerable) && node.Arguments.Count > 0)
{
leftExpression = node.Arguments[0] as MemberExpression;
arguments.AddRange(node.Arguments.Skip(1).Select(UnQuote).OfType<LambdaExpression>());
}
if (leftExpression != null)
{
switch (methodName)
{
case "Any":
case "Count":
case "All":
return TranslateOneToMany(
methodName,
leftExpression,
null,
arguments.Count > 0 ? arguments[0] : null
);
case "Sum":
case "Avg":
return TranslateOneToMany(
methodName,
leftExpression,
arguments[0],
null
);
}
}
throw new SqlExpressionTranslatorException(node.ToString());
}
internal static void CheckChainedSequence(MethodCallExpression call, Type type)
{
if (ReflectionUtil.IsSequenceMethod(call.Method, SequenceMethod.Select))
{
MethodCallExpression insideCall = ResourceBinder.StripTo<MethodCallExpression>(call.Arguments[0]);
if (insideCall != null && ReflectionUtil.IsSequenceMethod(insideCall.Method, SequenceMethod.Select))
{
throw new NotSupportedException(string.Format(CultureInfo.CurrentCulture, SR.ALinqExpressionNotSupportedInProjection, type, call.ToString()));
}
}
}
protected override Expression VisitOtherMethodCall(MethodCallExpression expression)
{
throw new NotSupportedException(String.Format("Method Call to {0} is not supported.", expression.ToString()));
}
private Expression BuildFromMethodCall(MethodCallExpression node)
{
Expression source;
IEnumerable<Expression> arguments;
if (node.Object != null)
{
source = node.Object;
arguments = node.Arguments;
}
else
{
// assuming an extension method here...
source = node.Arguments[0];
arguments = node.Arguments.Skip(1);
}
var projection = BindProjection(source);
var result = _methodCallBinder.Bind(projection, _context, node, arguments);
if (result == null)
{
var message = string.Format("The method {0} is not supported in the expression tree: {1}.",
node.Method.Name,
node.ToString());
throw new NotSupportedException(message);
}
return result;
}
