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 string GetColumnMapKey(ColumnMap columnMap, SpanIndex spanIndex)
{
ColumnMapKeyBuilder columnMapKeyBuilder = new ColumnMapKeyBuilder(spanIndex);
columnMap.Accept <int>((ColumnMapVisitor <int>)columnMapKeyBuilder, 0);
return(columnMapKeyBuilder._builder.ToString());
}
// <summary>
// Returns a string uniquely identifying the given ColumnMap.
// </summary>
internal static string GetColumnMapKey(ColumnMap columnMap, SpanIndex spanIndex)
{
var builder = new ColumnMapKeyBuilder(spanIndex);
columnMap.Accept(builder, 0);
return(builder._builder.ToString());
}
/// <summary>
/// Moves forward by one char or one classification span
/// </summary>
/// <returns>true, if moved</returns>
public override bool MoveNext()
{
if (!AtEnd())
{
//operators are processed char by char, because the classifier can merge several operators into one span (like "]]", "[]")
CurrentPoint = CurrentSpan != null && CurrentSpan.ClassificationType.Classification != "punctuation" ? CurrentSpan.Span.End : CurrentPoint + 1;
if (SpanIndex.ContainsKey(CurrentPoint.Position))
{
CurrentSpan = SpanIndex[CurrentPoint.Position];
}
else
{
if (CurrentSpan != null && CurrentPoint.Position >= CurrentSpan.Span.End.Position) //we're out of current span
{
CurrentSpan = null;
}
}
return(true);
}
return(false);
}
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);
}
private ColumnMapKeyBuilder(SpanIndex spanIndex)
{
_spanIndex = spanIndex;
}
internal override ShaperFactory TypedCreate(QueryCacheManager cacheManager, ColumnMap columnMap, MetadataWorkspace metadata, SpanIndex spanInfo, MergeOption mergeOption, bool valueLayer)
{
return(Translator.TranslateColumnMap <T>(cacheManager, columnMap, metadata, spanInfo, mergeOption, valueLayer));
}
internal abstract ShaperFactory TypedCreate(QueryCacheManager cacheManager, ColumnMap columnMap, MetadataWorkspace metadata, SpanIndex spanInfo, MergeOption mergeOption, bool valueLayer);
internal static ShaperFactory Create(Type elementType, QueryCacheManager cacheManager, ColumnMap columnMap, MetadataWorkspace metadata, SpanIndex spanInfo, MergeOption mergeOption, bool valueLayer)
{
ShaperFactoryCreator creator = (ShaperFactoryCreator)Activator.CreateInstance(typeof(TypedShaperFactoryCreator <>).MakeGenericType(elementType));
return(creator.TypedCreate(cacheManager, columnMap, metadata, spanInfo, mergeOption, valueLayer));
}