private DbQueryCommandTree Simplify(DbQueryCommandTree view)
{
var simplifier = PatternMatchRuleProcessor.Create(
// determines if an expression is of the form outerProject(outerProjection(innerProject(innerNew)))
PatternMatchRule.Create(Pattern_CollapseNestedProjection, ViewSimplifier.CollapseNestedProjection),
// A case statement can potentially be simplified
PatternMatchRule.Create(Pattern_Case, ViewSimplifier.SimplifyCaseStatement),
// Nested TPH discriminator pattern can be converted to the expected TPH discriminator pattern
PatternMatchRule.Create(Pattern_NestedTphDiscriminator, ViewSimplifier.SimplifyNestedTphDiscriminator),
// Entity constructors may be augmented with FK-based related entity refs
PatternMatchRule.Create(Pattern_EntityConstructor, this.AddFkRelatedEntityRefs)
);
DbExpression queryExpression = view.Query;
queryExpression = simplifier(queryExpression);
view = DbQueryCommandTree.FromValidExpression(view.MetadataWorkspace, view.DataSpace, queryExpression);
return(view);
}
/// <summary>
/// Constructs a new PatternMatch rule with the specified pattern, processor and default <see cref="DbExpressionRule.ProcessedAction"/> of <see cref="DbExpressionRule.ProcessedAction.Reset"/>
/// </summary>
internal static PatternMatchRule Create(Func <DbExpression, bool> matchFunc, Func <DbExpression, DbExpression> processor)
{
return(PatternMatchRule.Create(matchFunc, processor, ProcessedAction.Reset));
}