public Expression ApplyNavigation(Expression source, IEnumerable <OeParseNavigationSegment> parseNavigationSegments)
{
if (parseNavigationSegments == null)
{
return(source);
}
Type sourceItemType = OeExpressionHelper.GetCollectionItemType(source.Type);
foreach (OeParseNavigationSegment parseNavigationSegment in parseNavigationSegments)
{
Type selectType;
ParameterExpression parameter;
Expression e;
if (parseNavigationSegment.NavigationSegment == null) //EntitySetSegment
{
parameter = Parameter;
e = source;
selectType = sourceItemType;
}
else
{
parameter = Expression.Parameter(sourceItemType);
PropertyInfo navigationClrProperty = sourceItemType.GetTypeInfo().GetProperty(parseNavigationSegment.NavigationSegment.NavigationProperty.Name);
e = Expression.MakeMemberAccess(parameter, navigationClrProperty);
MethodInfo selectMethodInfo;
selectType = OeExpressionHelper.GetCollectionItemType(e.Type);
if (selectType == null)
{
selectType = e.Type;
selectMethodInfo = OeMethodInfoHelper.GetSelectMethodInfo(sourceItemType, selectType);
}
else
{
selectMethodInfo = OeMethodInfoHelper.GetSelectManyMethodInfo(sourceItemType, selectType);
}
LambdaExpression lambda = Expression.Lambda(e, parameter);
source = Expression.Call(selectMethodInfo, source, lambda);
}
if (parseNavigationSegment.Filter != null)
{
var visitor = new OeQueryNodeVisitor(_visitor, Expression.Parameter(selectType));
e = visitor.TranslateNode(parseNavigationSegment.Filter.Expression);
LambdaExpression lambda = Expression.Lambda(e, visitor.Parameter);
MethodInfo whereMethodInfo = OeMethodInfoHelper.GetWhereMethodInfo(selectType);
source = Expression.Call(whereMethodInfo, source, lambda);
}
_entityType = selectType;
sourceItemType = selectType;
}
_visitor = new OeQueryNodeVisitor(_model, Expression.Parameter(_entityType), _visitor.Constans);
return(source);
}
public Expression ApplyNavigation(Expression source, IReadOnlyList <OeParseNavigationSegment> parseNavigationSegments)
{
if (parseNavigationSegments == null)
{
return(source);
}
Type sourceItemType = OeExpressionHelper.GetCollectionItemType(source.Type);
foreach (OeParseNavigationSegment parseNavigationSegment in parseNavigationSegments)
{
Type selectType;
ParameterExpression parameter;
Expression e;
if (parseNavigationSegment.NavigationSegment == null) //EntitySetSegment, KeySegment
{
parameter = Visitor.Parameter;
e = source;
selectType = sourceItemType;
}
else
{
parameter = Expression.Parameter(sourceItemType);
PropertyInfo navigationClrProperty = sourceItemType.GetPropertyIgnoreCase(parseNavigationSegment.NavigationSegment.NavigationProperty);
e = Expression.MakeMemberAccess(parameter, navigationClrProperty);
MethodInfo selectMethodInfo;
selectType = OeExpressionHelper.GetCollectionItemTypeOrNull(e.Type) ?? e.Type;
if (selectType == e.Type)
{
selectMethodInfo = OeMethodInfoHelper.GetSelectMethodInfo(sourceItemType, selectType);
}
else
{
selectMethodInfo = OeMethodInfoHelper.GetSelectManyMethodInfo(sourceItemType, selectType);
}
LambdaExpression lambda = Expression.Lambda(e, parameter);
source = Expression.Call(selectMethodInfo, source, lambda);
}
if (parseNavigationSegment.Filter != null)
{
var visitor = new OeQueryNodeVisitor(Visitor, Expression.Parameter(selectType));
e = visitor.TranslateNode(parseNavigationSegment.Filter.Expression);
LambdaExpression lambda = Expression.Lambda(e, visitor.Parameter);
MethodInfo whereMethodInfo = OeMethodInfoHelper.GetWhereMethodInfo(selectType);
source = Expression.Call(whereMethodInfo, source, lambda);
}
sourceItemType = selectType;
}
Visitor.ChangeParameterType(Expression.Parameter(sourceItemType));
return(source);
}
public Expression Build(Expression source, IReadOnlyList <OeSkipTokenNameValue> skipTokenNameValues, OrderByClause uniqueOrderBy)
{
OrderProperty[] orderProperties = CreateOrderProperies(source, _visitor, skipTokenNameValues, uniqueOrderBy);
Expression filter = CreateFilterExpression(_visitor, _isDatabaseNullHighestValue, orderProperties);
LambdaExpression lambda = Expression.Lambda(filter, _visitor.Parameter);
MethodInfo whereMethodInfo = OeMethodInfoHelper.GetWhereMethodInfo(_visitor.Parameter.Type);
return(Expression.Call(whereMethodInfo, source, lambda));
}
public Expression Build(Expression source, String skipToken)
{
OrderProperty[] orderProperties = CreateOrderProperies(_skipTokenParser, skipToken);
Expression filter = CreateFilterExpression(source, _visitor, _skipTokenParser.IsDatabaseNullHighestValue, orderProperties);
LambdaExpression lambda = Expression.Lambda(filter, _visitor.Parameter);
MethodInfo whereMethodInfo = OeMethodInfoHelper.GetWhereMethodInfo(_visitor.Parameter.Type);
return(Expression.Call(whereMethodInfo, source, lambda));
}
public Expression ApplyFilter(Expression source, FilterClause filterClause)
{
if (filterClause == null)
{
return(source);
}
Expression e = Visitor.TranslateNode(filterClause.Expression);
LambdaExpression lambda = Expression.Lambda(e, Visitor.Parameter);
MethodInfo whereMethodInfo = OeMethodInfoHelper.GetWhereMethodInfo(ParameterType);
return(Expression.Call(whereMethodInfo, source, lambda));
}
private MethodCallExpression GetJoin(Expression innerSource, IEdmNavigationProperty navigationProperty)
{
Type outerType = OeExpressionHelper.GetCollectionItemType(_outerSource.Type);
Type innerType = OeExpressionHelper.GetCollectionItemType(innerSource.Type);
var joinBuilder = new OeJoinBuilder(new OeQueryNodeVisitor(_outerParameterExpression));
(LambdaExpression outerKeySelector, LambdaExpression innerKeySelector) =
joinBuilder.GetJoinKeySelector(outerType, innerType, Array.Empty <IEdmNavigationProperty>(), navigationProperty);
var replaceParameterVisitor = new ReplaceParameterVisitor(_outerParameterExpression, outerKeySelector.Parameters[0]);
Expression outerKeyExpression = replaceParameterVisitor.Visit(outerKeySelector.Body);
IReadOnlyList <MemberExpression> outerKeyProperties;
IReadOnlyList <MemberExpression> innerKeyProperties;
if (OeExpressionHelper.IsTupleType(outerKeySelector.ReturnType))
{
outerKeyProperties = OeExpressionHelper.GetPropertyExpressions(outerKeyExpression);
innerKeyProperties = OeExpressionHelper.GetPropertyExpressions(innerKeySelector.Body);
}
else
{
outerKeyProperties = new MemberExpression[] { (MemberExpression)outerKeyExpression };
innerKeyProperties = new MemberExpression[] { (MemberExpression)innerKeySelector.Body };
}
BinaryExpression?joinExpression = null;
for (int i = 0; i < outerKeyProperties.Count; i++)
{
if (joinExpression == null)
{
joinExpression = Expression.MakeBinary(ExpressionType.Equal, outerKeyProperties[i], innerKeyProperties[i]);
}
else
{
BinaryExpression equal = Expression.MakeBinary(ExpressionType.Equal, outerKeyProperties[i], innerKeyProperties[i]);
joinExpression = Expression.MakeBinary(ExpressionType.AndAlso, joinExpression, equal);
}
}
MethodInfo whereMethodInfo = OeMethodInfoHelper.GetWhereMethodInfo(innerType);
LambdaExpression joinLambda = Expression.Lambda(joinExpression !, innerKeySelector.Parameters);
return(Expression.Call(whereMethodInfo, innerSource, joinLambda));
}
private MethodCallExpression ApplyFilter(Expression source, FilterTransformationNode transformation)
{
Type sourceType = OeExpressionHelper.GetCollectionItemType(source.Type);
ParameterExpression sourceParameter = Expression.Parameter(sourceType);
var visitor = CreateVisitor(sourceParameter);
if (_aggProperties.Count > 0)
{
visitor.TuplePropertyByAliasName = GetTuplePropertyByAliasName;
}
Expression e = visitor.TranslateNode(transformation.FilterClause.Expression);
MethodInfo whereMethodInfo = OeMethodInfoHelper.GetWhereMethodInfo(sourceParameter.Type);
LambdaExpression lambda = Expression.Lambda(e, sourceParameter);
return(Expression.Call(whereMethodInfo, source, lambda));
}
