internal static bool TryRewrite(DbQueryCommandTree tree, Span span, MergeOption mergeOption, AliasGenerator aliasGenerator, out DbExpression newQuery, out SpanIndex spanInfo)
{
newQuery = null;
spanInfo = null;
ObjectSpanRewriter rewriter = null;
bool requiresRelationshipSpan = Span.RequiresRelationshipSpan(mergeOption);
// Potentially perform a rewrite for span.
// Note that the public 'Span' property is NOT used to retrieve the Span instance
// since this forces creation of a Span object that may not be required.
if (span != null && span.SpanList.Count > 0)
{
rewriter = new ObjectFullSpanRewriter(tree, tree.Query, span, aliasGenerator);
}
else if (requiresRelationshipSpan)
{
rewriter = new ObjectSpanRewriter(tree, tree.Query, aliasGenerator);
}
if (rewriter != null)
{
rewriter.RelationshipSpan = requiresRelationshipSpan;
newQuery = rewriter.RewriteQuery();
if (newQuery != null)
{
Debug.Assert(rewriter.SpanIndex != null || tree.Query.ResultType.EdmEquals(newQuery.ResultType), "Query was rewritten for Span but no SpanIndex was created?");
spanInfo = rewriter.SpanIndex;
}
}
return(spanInfo != null);
}
internal static bool TryRewrite(DbQueryCommandTree tree, Span span, MergeOption mergeOption, AliasGenerator aliasGenerator, out DbExpression newQuery, out SpanIndex spanInfo)
{
newQuery = null;
spanInfo = null;
ObjectSpanRewriter rewriter = null;
bool requiresRelationshipSpan = Span.RequiresRelationshipSpan(mergeOption);
// Potentially perform a rewrite for span.
// Note that the public 'Span' property is NOT used to retrieve the Span instance
// since this forces creation of a Span object that may not be required.
if (span != null && span.SpanList.Count > 0)
{
rewriter = new ObjectFullSpanRewriter(tree, tree.Query, span, aliasGenerator);
}
else if (requiresRelationshipSpan)
{
rewriter = new ObjectSpanRewriter(tree, tree.Query, aliasGenerator);
}
if (rewriter != null)
{
rewriter.RelationshipSpan = requiresRelationshipSpan;
newQuery = rewriter.RewriteQuery();
if (newQuery != null)
{
Debug.Assert(rewriter.SpanIndex != null || tree.Query.ResultType.EdmEquals(newQuery.ResultType), "Query was rewritten for Span but no SpanIndex was created?");
spanInfo = rewriter.SpanIndex;
}
}
return (spanInfo != null);
}
