internal static bool TryRewrite(
DbQueryCommandTree tree,
Span span,
MergeOption mergeOption,
AliasGenerator aliasGenerator,
out DbExpression newQuery,
out SpanIndex spanInfo)
{
newQuery = (DbExpression)null;
spanInfo = (SpanIndex)null;
ObjectSpanRewriter objectSpanRewriter = (ObjectSpanRewriter)null;
bool flag = Span.RequiresRelationshipSpan(mergeOption);
if (span != null && span.SpanList.Count > 0)
{
objectSpanRewriter = (ObjectSpanRewriter) new ObjectFullSpanRewriter((DbCommandTree)tree, tree.Query, span, aliasGenerator);
}
else if (flag)
{
objectSpanRewriter = new ObjectSpanRewriter((DbCommandTree)tree, tree.Query, aliasGenerator);
}
if (objectSpanRewriter != null)
{
objectSpanRewriter.RelationshipSpan = flag;
newQuery = objectSpanRewriter.RewriteQuery();
if (newQuery != null)
{
spanInfo = objectSpanRewriter.SpanIndex;
}
}
return(spanInfo != null);
}
private void AddSpanMap(RowType rowType, Dictionary <int, AssociationEndMember> columnMap)
{
if (this._spanIndex == null)
{
this._spanIndex = new SpanIndex();
}
this._spanIndex.AddSpanMap(rowType, columnMap);
}
private void AddSpannedRowType(RowType spannedType, TypeUsage originalType)
{
if (this._spanIndex == null)
{
this._spanIndex = new SpanIndex();
}
this._spanIndex.AddSpannedRowType(spannedType, originalType);
}
private void AddSpanMap(RowType rowType, Dictionary <int, AssociationEndMember> columnMap)
{
if (null == _spanIndex)
{
_spanIndex = new SpanIndex();
}
_spanIndex.AddSpanMap(rowType, columnMap);
}
private void AddSpannedRowType(RowType spannedType, TypeUsage originalType)
{
if (null == _spanIndex)
{
_spanIndex = new SpanIndex();
}
_spanIndex.AddSpannedRowType(spannedType, originalType);
}
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;
var 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);
}
