public override Expression Translate(ExpandedNavigationSelectItem item)
{
var segment = (NavigationPropertySegment)item.PathToNavigationProperty.LastSegment;
Expression expression = Translate(segment);
Type navigationItemType = expression.Type;
Type itemType = OeExpressionHelper.GetCollectionItemType(navigationItemType);
if (itemType != null)
{
var expressionBuilder = new OeExpressionBuilder(_model, itemType);
expression = expressionBuilder.ApplyFilter(expression, item.FilterOption);
expression = expressionBuilder.ApplyOrderBy(expression, item.OrderByOption);
var path = new ODataPath(_path.Union(item.PathToNavigationProperty));
expression = expressionBuilder.ApplySkip(expression, item.SkipOption, path);
expression = expressionBuilder.ApplyTake(expression, item.TopOption, path);
foreach (KeyValuePair <ConstantExpression, ConstantNode> constant in expressionBuilder.Constants)
{
_visitor.AddConstant(constant.Key, constant.Value);
}
}
Expression countExpression = null;
if (item.CountOption.GetValueOrDefault())
{
MethodInfo countMethodInfo = OeMethodInfoHelper.GetCountMethodInfo(itemType);
countExpression = Expression.Call(countMethodInfo, expression);
}
if (item.SelectAndExpand.SelectedItems.Any())
{
var path = new ODataPath(_path.Union(item.PathToNavigationProperty));
var selectTranslator = new OeSelectTranslator(_visitor, path);
Expression nestedExpression = selectTranslator.CreateExpression(expression, item.SelectAndExpand, OeMetadataLevel.Minimal);
Type nestedType = OeExpressionHelper.GetCollectionItemType(nestedExpression.Type);
if (nestedType == null)
{
var visitor = new ParameterVisitor(selectTranslator._parameter, expression);
nestedExpression = visitor.Visit(nestedExpression);
nestedType = nestedExpression.Type;
}
_selectItemInfo.EntryFactory = selectTranslator.CreateNestedEntryFactory(nestedType, _selectItemInfo.EntitySet, _selectItemInfo.ResourceInfo);
expression = nestedExpression;
}
if (countExpression != null)
{
return(CreateNavigationLinkInfo(navigationItemType, expression, countExpression));
}
return(expression);
}
public Expression ApplySelect(Expression source, SelectExpandClause selectClause, ODataPath path, OeMetadataLevel metadatLevel)
{
if (selectClause == null)
{
return(source);
}
var selectTranslator = new OeSelectTranslator(_visitor, path);
Expression selectExpression = selectTranslator.Build(source, selectClause, metadatLevel);
_entryFactory = selectTranslator.CreateEntryFactory;
Type selectItemType = OeExpressionHelper.GetCollectionItemType(selectExpression.Type);
_visitor = new OeQueryNodeVisitor(_model, Expression.Parameter(selectItemType), _visitor.Constans);
return(selectExpression);
}
public Expression ApplySelect(Expression source, OeQueryContext queryContext)
{
if (queryContext.ODataUri.SelectAndExpand == null && (queryContext.ODataUri.OrderBy == null || queryContext.PageSize == 0))
{
return(source);
}
var selectTranslator = new OeSelectTranslator(_visitor, queryContext.ODataUri.Path);
Expression selectExpression = selectTranslator.Build(source, queryContext);
if (selectExpression == null)
{
return(source);
}
_entryFactory = selectTranslator.CreateEntryFactory;
Type selectItemType = OeExpressionHelper.GetCollectionItemType(selectExpression.Type);
_visitor = new OeQueryNodeVisitor(_model, Expression.Parameter(selectItemType), _visitor.Constans);
return(selectExpression);
}
public override SelectItemInfo Translate(ExpandedNavigationSelectItem item)
{
var segment = (NavigationPropertySegment)item.PathToNavigationProperty.LastSegment;
if (_navigationNextLink && segment.NavigationProperty.Type is IEdmCollectionTypeReference)
{
return(null);
}
SelectItemInfo selectItemInfo = CreateNavigationSelectItemInfo(_model, segment, false, item.CountOption);
PropertyInfo navigationClrProperty = _parameter.Type.GetProperty(selectItemInfo.EdmProperty.Name);
Expression expression = Expression.MakeMemberAccess(_parameter, navigationClrProperty);
Type itemType = OeExpressionHelper.GetCollectionItemType(expression.Type);
if (itemType != null)
{
var expressionBuilder = new OeExpressionBuilder(_model, itemType);
expression = expressionBuilder.ApplyFilter(expression, item.FilterOption);
expression = expressionBuilder.ApplyOrderBy(expression, item.OrderByOption);
var path = new ODataPath(_path.Union(item.PathToNavigationProperty));
expression = expressionBuilder.ApplySkip(expression, item.SkipOption, path);
expression = expressionBuilder.ApplyTake(expression, item.TopOption, path);
foreach (KeyValuePair <ConstantExpression, ConstantNode> constant in expressionBuilder.Constants)
{
_visitor.AddConstant(constant.Key, constant.Value);
}
}
if (item.SelectAndExpand.SelectedItems.Any())
{
var path = new ODataPath(_path.Union(item.PathToNavigationProperty));
var selectTranslator = new OeSelectTranslator(_visitor, path);
ParameterExpression parameter = Expression.Parameter(itemType ?? expression.Type);
selectTranslator.BuildSelect(item.SelectAndExpand, expression, parameter, _metadataLevel, _navigationNextLink);
Expression nestedExpression;
Type nestedType;
if (itemType == null)
{
nestedExpression = selectTranslator.CreateTupleExpression();
var visitor = new ParameterVisitor(parameter, expression, segment.NavigationProperty.Type.IsNullable);
nestedExpression = visitor.Visit(nestedExpression);
nestedType = nestedExpression.Type;
}
else
{
nestedExpression = selectTranslator.CreateSelectExpression(expression, parameter);
nestedType = OeExpressionHelper.GetCollectionItemType(nestedExpression.Type);
}
selectItemInfo.EntryFactory = selectTranslator.CreateNestedEntryFactory(nestedType, selectItemInfo.EntitySet, selectItemInfo.Resource);
expression = nestedExpression;
}
selectItemInfo.Expression = expression;
return(selectItemInfo);
}
