private DbQueryCommandTree Simplify(DbQueryCommandTree view)
{
DbExpression query = PatternMatchRuleProcessor.Create(PatternMatchRule.Create(ViewSimplifier._patternCollapseNestedProjection, new Func <DbExpression, DbExpression>(ViewSimplifier.CollapseNestedProjection)), PatternMatchRule.Create(ViewSimplifier._patternCase, new Func <DbExpression, DbExpression>(ViewSimplifier.SimplifyCaseStatement)), PatternMatchRule.Create(ViewSimplifier._patternNestedTphDiscriminator, new Func <DbExpression, DbExpression>(ViewSimplifier.SimplifyNestedTphDiscriminator)), PatternMatchRule.Create(ViewSimplifier._patternEntityConstructor, new Func <DbExpression, DbExpression>(this.AddFkRelatedEntityRefs)))(view.Query);
view = DbQueryCommandTree.FromValidExpression(view.MetadataWorkspace, view.DataSpace, query, view.UseDatabaseNullSemantics);
return(view);
}
private DbQueryCommandTree Simplify(DbQueryCommandTree view)
{
var simplifier = PatternMatchRuleProcessor.Create(
// determines if an expression is of the form outerProject(outerProjection(innerProject(innerNew)))
PatternMatchRule.Create(_patternCollapseNestedProjection, CollapseNestedProjection),
// A case statement can potentially be simplified
PatternMatchRule.Create(_patternCase, SimplifyCaseStatement),
// Nested TPH discriminator pattern can be converted to the expected TPH discriminator pattern
PatternMatchRule.Create(_patternNestedTphDiscriminator, SimplifyNestedTphDiscriminator),
// Entity constructors may be augmented with FK-based related entity refs
PatternMatchRule.Create(_patternEntityConstructor, AddFkRelatedEntityRefs)
);
var queryExpression = view.Query;
queryExpression = simplifier(queryExpression);
view = DbQueryCommandTree.FromValidExpression(view.MetadataWorkspace, view.DataSpace, queryExpression);
return(view);
}