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Signum Framework Tutorials Part 2 – Southwind Logic

, 15 Nov 2012
In this part, we will focus on writing business logic, LINQ queries and explain inheritance
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Linq.Expressions;
using System.Collections.ObjectModel;
using Signum.Utilities;
using Signum.Utilities.Reflection;
using System.Diagnostics;
using Signum.Utilities.ExpressionTrees; 


namespace Signum.Engine.Linq
{
    /// <summary>
    /// An extended expression visitor including custom DbExpression nodes
    /// </summary>
    internal class DbExpressionVisitor : SimpleExpressionVisitor
    {
        protected override Expression Visit(Expression exp)
        {
            if (exp == null)
                return null;

            switch (exp.NodeType)
            {  
                case ExpressionType.Negate:
                case ExpressionType.NegateChecked:
                case ExpressionType.Not:
                case ExpressionType.Convert:
                case ExpressionType.ConvertChecked:
                case ExpressionType.ArrayLength:
                case ExpressionType.Quote:
                case ExpressionType.TypeAs:
                case ExpressionType.UnaryPlus:
                    return this.VisitUnary((UnaryExpression)exp);
                case ExpressionType.Add:
                case ExpressionType.AddChecked:
                case ExpressionType.Subtract:
                case ExpressionType.SubtractChecked:
                case ExpressionType.Multiply:
                case ExpressionType.MultiplyChecked:
                case ExpressionType.Divide:
                case ExpressionType.Modulo:
                case ExpressionType.And:
                case ExpressionType.AndAlso:
                case ExpressionType.Or:
                case ExpressionType.OrElse:
                case ExpressionType.LessThan:
                case ExpressionType.LessThanOrEqual:
                case ExpressionType.GreaterThan:
                case ExpressionType.GreaterThanOrEqual:
                case ExpressionType.Equal:
                case ExpressionType.NotEqual:
                case ExpressionType.Coalesce:
                case ExpressionType.ArrayIndex:
                case ExpressionType.RightShift:
                case ExpressionType.LeftShift:
                case ExpressionType.ExclusiveOr:
                case ExpressionType.Power:
                    return this.VisitBinary((BinaryExpression)exp);
                case ExpressionType.TypeIs:
                    return this.VisitTypeIs((TypeBinaryExpression)exp);
                case ExpressionType.Conditional:
                    return this.VisitConditional((ConditionalExpression)exp);
                case ExpressionType.Constant:
                    return this.VisitConstant((ConstantExpression)exp);
                case ExpressionType.Parameter:
                    return this.VisitParameter((ParameterExpression)exp);
                case ExpressionType.MemberAccess:
                    return this.VisitMemberAccess((MemberExpression)exp);
                case ExpressionType.Call:
                    return this.VisitMethodCall((MethodCallExpression)exp);
                case ExpressionType.Lambda:
                    return this.VisitLambda((LambdaExpression)exp);
                case ExpressionType.New:
                    return this.VisitNew((NewExpression)exp);
                case ExpressionType.NewArrayInit:
                case ExpressionType.NewArrayBounds:
                    return this.VisitNewArray((NewArrayExpression)exp);
                case ExpressionType.Invoke:
                    return this.VisitInvocation((InvocationExpression)exp);
                case ExpressionType.MemberInit:
                    return this.VisitMemberInit((MemberInitExpression)exp);
                case ExpressionType.ListInit:
                    return this.VisitListInit((ListInitExpression)exp);
               
                case (ExpressionType)DbExpressionType.Table:
                    return this.VisitTable((TableExpression)exp);
                case (ExpressionType)DbExpressionType.Column:
                    return this.VisitColumn((ColumnExpression)exp);
                case (ExpressionType)DbExpressionType.Select:
                    return this.VisitSelect((SelectExpression)exp);
                case (ExpressionType)DbExpressionType.Join:
                    return this.VisitJoin((JoinExpression)exp);
                case (ExpressionType)DbExpressionType.Projection:
                    return this.VisitProjection((ProjectionExpression)exp);
                case (ExpressionType)DbExpressionType.ChildProjection:
                    return this.VisitChildProjection((ChildProjectionExpression)exp);
                case (ExpressionType)DbExpressionType.Aggregate:
                    return this.VisitAggregate((AggregateExpression)exp);
                case (ExpressionType)DbExpressionType.AggregateSubquery:
                    return this.VisitAggregateSubquery((AggregateSubqueryExpression)exp);
                case (ExpressionType)DbExpressionType.SqlCast:
                    return this.VisitSqlCast((SqlCastExpression)exp);
                case (ExpressionType)DbExpressionType.SqlEnum:
                    return this.VisitSqlEnum((SqlEnumExpression)exp);
                case (ExpressionType)DbExpressionType.SqlFunction:
                    return this.VisitSqlFunction((SqlFunctionExpression)exp);
                case (ExpressionType)DbExpressionType.SqlConstant:
                    return this.VisitSqlConstant((SqlConstantExpression)exp);
                case (ExpressionType)DbExpressionType.Case:
                    return this.VisitCase((CaseExpression)exp);
                case (ExpressionType)DbExpressionType.RowNumber:
                    return this.VisitRowNumber((RowNumberExpression)exp);
                case (ExpressionType)DbExpressionType.Like:
                    return this.VisitLike((LikeExpression)exp);
                case (ExpressionType)DbExpressionType.In:
                case (ExpressionType)DbExpressionType.Scalar:
                case (ExpressionType)DbExpressionType.Exists:
                    return this.VisitSubquery((SubqueryExpression)exp);
                case (ExpressionType)DbExpressionType.IsNull:
                    return this.VisitIsNull((IsNullExpression)exp);
                case (ExpressionType)DbExpressionType.IsNotNull:
                    return this.VisitIsNotNull((IsNotNullExpression)exp);
                case (ExpressionType)DbExpressionType.Delete:
                    return this.VisitDelete((DeleteExpression)exp);
                case (ExpressionType)DbExpressionType.Update:
                    return this.VisitUpdate((UpdateExpression)exp);
                case (ExpressionType)DbExpressionType.CommandAggregate:
                    return this.VisitCommandAggregate((CommandAggregateExpression)exp);
                case (ExpressionType)DbExpressionType.SelectRowCount:
                    return this.VisitSelectRowCount((SelectRowCountExpression)exp);
                case (ExpressionType)DbExpressionType.FieldInit:
                    return this.VisitFieldInit((FieldInitExpression)exp);
                case (ExpressionType)DbExpressionType.EmbeddedFieldInit:
                    return this.VisitEmbeddedFieldInit((EmbeddedFieldInitExpression)exp);
                case (ExpressionType)DbExpressionType.ImplementedBy:
                    return this.VisitImplementedBy((ImplementedByExpression)exp);
                case (ExpressionType)DbExpressionType.ImplementedByAll:
                    return this.VisitImplementedByAll((ImplementedByAllExpression)exp);
                case (ExpressionType)DbExpressionType.LiteReference:
                    return this.VisitLiteReference((LiteReferenceExpression)exp);
                case (ExpressionType)DbExpressionType.MList:
                    return this.VisitMList((MListExpression)exp);
                case (ExpressionType)DbExpressionType.MListElement:
                    return this.VisitMListElement((MListElementExpression)exp);

                default:
                    return base.Visit(exp);
            }
        }

      
        protected virtual Expression VisitCommandAggregate(CommandAggregateExpression cea)
        {
            var commands = VisitCommands(cea.Commands);
            if (cea.Commands != commands)
                return new CommandAggregateExpression(commands);
            return cea; 
        }

        protected IEnumerable<CommandExpression> VisitCommands(ReadOnlyCollection<CommandExpression> commands)
        {
            return commands.NewIfChange(c => (CommandExpression)Visit(c));
        }

        protected virtual Expression VisitDelete(DeleteExpression delete)
        {
            var source = Visit(delete.Source);
            var where = Visit(delete.Where);
            if (source != delete.Source || where != delete.Where)
                return new DeleteExpression(delete.Table, (SourceExpression)source, where);
            return delete;
        }

        protected virtual Expression VisitUpdate(UpdateExpression update)
        {
            var source = Visit(update.Source); 
            var where = Visit(update.Where);
            var assigments = VisitColumnAssigments(update.Assigments);
            if(source != update.Source || where != update.Where || assigments != update.Assigments)
                return new UpdateExpression(update.Table, (SourceExpression)source, where, assigments);
            return update;
        }

        protected IEnumerable<ColumnAssignment> VisitColumnAssigments(ReadOnlyCollection<ColumnAssignment> columns)
        {
            return columns.NewIfChange(c =>
                {
                    var exp = Visit(c.Expression);
                    if (exp != c.Expression)
                        return new ColumnAssignment(c.Column, exp);
                    return c;
                });
        }

        protected virtual Expression VisitSelectRowCount(SelectRowCountExpression src)
        {
            return src;
        }

        protected virtual Expression VisitLiteReference(LiteReferenceExpression lite)
        {
            var newRef = Visit(lite.Reference);
            var newToStr = Visit(lite.ToStr);
            var newId = Visit(lite.Id);
            var newTypeId = Visit(lite.TypeId);
            if (newRef != lite.Reference || newToStr != lite.ToStr || newId != lite.Id || newTypeId != lite.TypeId)
                return new LiteReferenceExpression(lite.Type, newRef, newId, newToStr, newTypeId);
            return lite;
        }

        protected virtual Expression VisitMList(MListExpression ml)
        {
            var newBackID = Visit(ml.BackID);
            if (newBackID != ml.BackID)
                return new MListExpression(ml.Type, newBackID, ml.RelationalTable);
            return ml;
        }

        protected virtual Expression VisitMListElement(MListElementExpression mle)
        {
            var rowId = Visit(mle.RowId);
            var parent = (FieldInitExpression)Visit(mle.Parent);
            var element = Visit(mle.Element);
            if (rowId != mle.RowId || parent != mle.Parent || element != mle.Parent)
                return new MListElementExpression(rowId, parent, element, mle.Table);
            return mle;
        }

        protected virtual Expression VisitSqlEnum(SqlEnumExpression sqlEnum)
        {
            return sqlEnum;
        }

        protected virtual Expression VisitSqlCast(SqlCastExpression castExpr)
        {
            var expression = Visit(castExpr.Expression);
            if (expression != castExpr.Expression)
                return new SqlCastExpression(castExpr.Type, expression,castExpr.SqlDbType);
            return castExpr;
        }

        protected virtual Expression VisitTable(TableExpression table)
        {
            return table;
        }

        protected virtual Expression VisitColumn(ColumnExpression column)
        {
            return column;
        }


    

        protected virtual Expression VisitImplementedByAll(ImplementedByAllExpression reference)
        {
            var id = Visit(reference.Id);
            var typeId = Visit(reference.TypeId);
            var implementations = reference.Implementations
               .NewIfChange(ri => Visit(ri.Field).Map(r => r == ri.Field ? ri : new ImplementationColumnExpression(ri.Type, (FieldInitExpression)r)));

            var token = VisitProjectionToken(reference.Token);

            if (id != reference.Id || typeId != reference.TypeId || implementations != reference.Implementations || token != reference.Token)
                return new ImplementedByAllExpression(reference.Type, id, typeId, token) { Implementations = implementations };
            return reference;
        }

      
        protected virtual Expression VisitImplementedBy(ImplementedByExpression reference)
        {
            var implementations = reference.Implementations
                .NewIfChange(ri => Visit(ri.Field).Map(r => r == ri.Field ? ri : new ImplementationColumnExpression(ri.Type, (FieldInitExpression)r)));

            var propertyBindings = reference.PropertyBindings.NewIfChange(pb => Visit(pb.Binding).Map(r => r == pb.Binding ? pb : new PropertyBinding(pb.PropertyInfo, r)));

            if (implementations != reference.Implementations || propertyBindings != reference.PropertyBindings)
                return new ImplementedByExpression(reference.Type, implementations) { PropertyBindings = propertyBindings };
            return reference;
        }

        protected virtual ProjectionToken VisitProjectionToken(ProjectionToken token)
        {
            return token;
        }
     
        protected virtual Expression VisitFieldInit(FieldInitExpression fie)
        {
            var bindings = fie.Bindings.NewIfChange(fb => Visit(fb.Binding).Map(r => r == fb.Binding ? fb : new FieldBinding(fb.FieldInfo, r)));

            var id = Visit(fie.ExternalId);
            var other = Visit(fie.OtherCondition);

            var token = VisitProjectionToken(fie.Token);

            if (fie.Bindings != bindings || fie.ExternalId != id || fie.OtherCondition != other || fie.Token != token)
                return new FieldInitExpression(fie.Type, fie.TableAlias, id, other, token) { Bindings = bindings };

            return fie;
        }

        protected virtual Expression VisitEmbeddedFieldInit(EmbeddedFieldInitExpression efie)
        {
            var bindings = efie.Bindings.NewIfChange(fb => Visit(fb.Binding).Map(r => r == fb.Binding ? fb : new FieldBinding(fb.FieldInfo, r)));
            var hasValue = Visit(efie.HasValue);

            if (efie.Bindings != bindings || efie.HasValue != hasValue)
            {
                return new EmbeddedFieldInitExpression(efie.Type, hasValue, bindings, efie.FieldEmbedded);
            }
            return efie;
        }

        protected virtual Expression VisitLike(LikeExpression like)
        {
            Expression exp = Visit(like.Expression);
            Expression pattern = Visit(like.Pattern);
            if (exp != like.Expression || pattern != like.Pattern)
                return new LikeExpression(exp, pattern);
            return like;
        }

        protected virtual Expression VisitSubquery(SubqueryExpression subquery)
        {
            switch ((DbExpressionType)subquery.NodeType)
            {
                case DbExpressionType.Scalar:
                    return this.VisitScalar((ScalarExpression)subquery);
                case DbExpressionType.Exists:
                    return this.VisitExists((ExistsExpression)subquery);
                case DbExpressionType.In:
                    return this.VisitIn((InExpression)subquery);
            }
            return subquery;
        }

        protected virtual Expression VisitScalar(ScalarExpression scalar)
        {
            var select = (SelectExpression)this.Visit(scalar.Select);
            if (select != scalar.Select)
                return new ScalarExpression(scalar.Type, select);
            return scalar;
        }

        protected virtual Expression VisitExists(ExistsExpression exists)
        {
            var select = (SelectExpression)this.Visit(exists.Select);
            if (select != exists.Select)
                return new ExistsExpression(select);
            return exists;
        }

        protected virtual Expression VisitIn(InExpression @in)
        {
            var expression = this.Visit(@in.Expression);
            var select = (SelectExpression)this.Visit(@in.Select);
            if (expression != @in.Expression || select != @in.Select)
            {
                if (select != null)
                    return new InExpression(expression, select);
                else
                    return InExpression.FromValues(expression, @in.Values);
            }
            return @in;
        }

        protected virtual Expression VisitIsNull(IsNullExpression isNull)
        {
            var newExpr = Visit(isNull.Expression);
            if (newExpr != isNull.Expression)
                return new IsNullExpression(newExpr);
            return isNull;
        }

        protected virtual Expression VisitIsNotNull(IsNotNullExpression isNotNull)
        {
            var newExpr = Visit(isNotNull.Expression);
            if (newExpr != isNotNull.Expression)
                return new IsNotNullExpression(newExpr);
            return isNotNull;
        }

        protected virtual Expression VisitRowNumber(RowNumberExpression rowNumber)
        {
            var orderBys = VisitOrderBy(rowNumber.OrderBy);
            if (orderBys != rowNumber.OrderBy)
                return new RowNumberExpression(orderBys);
            return rowNumber;
        }

        protected virtual Expression VisitAggregate(AggregateExpression aggregate)
        {
            Expression source = Visit(aggregate.Source);
            if (source != aggregate.Source)
                return new AggregateExpression(aggregate.Type, source, aggregate.AggregateFunction);
            return aggregate;
        }

        protected virtual Expression VisitAggregateSubquery(AggregateSubqueryExpression aggregate)
        {
            var subquery = (ScalarExpression)this.Visit(aggregate.AggregateAsSubquery);
            if (subquery != aggregate.AggregateAsSubquery)
                return new AggregateSubqueryExpression(aggregate.GroupByAlias, aggregate.AggregateInGroupSelect, subquery);
            return aggregate;
        }

        protected virtual Expression VisitSelect(SelectExpression select)
        {
            Expression top = this.Visit(select.Top);
            SourceExpression from = this.VisitSource(select.From);
            Expression where = this.Visit(select.Where);
            ReadOnlyCollection<ColumnDeclaration> columns = this.VisitColumnDeclarations(select.Columns);
            ReadOnlyCollection<OrderExpression> orderBy = this.VisitOrderBy(select.OrderBy);
            ReadOnlyCollection<Expression> groupBy = this.VisitGroupBy(select.GroupBy);

            if (top != select.Top || from != select.From || where != select.Where || columns != select.Columns || orderBy != select.OrderBy || groupBy != select.GroupBy)
                return new SelectExpression(select.Alias, select.Distinct, select.Reverse, top,  columns, from, where, orderBy, groupBy);

            return select;
        }

        protected virtual Expression VisitJoin(JoinExpression join)
        {
            SourceExpression left = this.VisitSource(join.Left);
            SourceExpression right = this.VisitSource(join.Right);
            Expression condition = this.Visit(join.Condition);
            if (left != join.Left || right != join.Right || condition != join.Condition)
            {
                return new JoinExpression(join.JoinType, left, right, condition);
            }
            return join;
        }

        protected virtual SourceExpression VisitSource(SourceExpression source)
        {
            return (SourceExpression)this.Visit(source);
        }

        protected virtual Expression VisitProjection(ProjectionExpression proj)
        {
            SelectExpression source = (SelectExpression)this.Visit(proj.Source);
            Expression projector = this.Visit(proj.Projector);
            ProjectionToken token = VisitProjectionToken(proj.Token);

            if (source != proj.Source || projector != proj.Projector || token != proj.Token)
            {
                return new ProjectionExpression(source, projector, proj.UniqueFunction, token, proj.Type);
            }
            return proj;
        }

        protected virtual Expression VisitChildProjection(ChildProjectionExpression child)
        {
            ProjectionExpression proj = (ProjectionExpression)this.Visit(child.Projection);
            Expression key = this.Visit(child.OuterKey);

            if (proj != child.Projection || key != child.OuterKey)
            {
                return new ChildProjectionExpression(proj, key);
            }
            return child;
        }

        protected virtual Expression VisitSqlFunction(SqlFunctionExpression sqlFunction)
        {
            ReadOnlyCollection<Expression> args = sqlFunction.Arguments.NewIfChange(a => Visit(a));
            if(args != sqlFunction.Arguments)
                return new SqlFunctionExpression(sqlFunction.Type, sqlFunction.SqlFunction, args); 
            return sqlFunction;
        }

        protected virtual Expression VisitSqlConstant(SqlConstantExpression sce)
        {
            return sce;
        }

        protected virtual Expression VisitCase(CaseExpression cex)
        {
            var newWhens = cex.Whens.NewIfChange(w => VisitWhen(w));
            var newDefault = Visit(cex.DefaultValue);

            if (newWhens != cex.Whens || newDefault != cex.DefaultValue)
                return new CaseExpression(newWhens, newDefault);
            return cex;
        }

        protected virtual When VisitWhen(When when)
        {
            var newCondition = Visit(when.Condition);
            var newValue = Visit(when.Value);
            if (when.Condition != newCondition || newValue != when.Value)
                return new When(newCondition, newValue);
            return when;
        }

        protected ReadOnlyCollection<ColumnDeclaration> VisitColumnDeclarations(ReadOnlyCollection<ColumnDeclaration> columns)
        {
            return columns.NewIfChange(c => Visit(c.Expression).Map(e => e == c.Expression ? c : new ColumnDeclaration(c.Name, e)));
        }

        protected ReadOnlyCollection<OrderExpression> VisitOrderBy(ReadOnlyCollection<OrderExpression> expressions)
        {
            return expressions.NewIfChange(o => Visit(o.Expression).Map(e => e == o.Expression ? o : new OrderExpression(o.OrderType, e)));
        }

        protected ReadOnlyCollection<Expression> VisitGroupBy(ReadOnlyCollection<Expression> expressions)
        {
            return expressions.NewIfChange(e => Visit(e));
        }
    }
}

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About the Author

Olmo del Corral
Software Developer (Senior) Signum Software
Spain Spain
I'm Computer Scientist, one of the founders of Signum Software, and the lead developer behind Signum Framework.
 
www.signumframework.com
 
I love programming in C#, Linq, Compilers, Algorithms, Functional Programming, Computer Graphics, Maths...

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