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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 Signum.Utilities.Reflection;
using System.Linq.Expressions;
using System.Reflection;
using Signum.Utilities;
using Signum.Entities.Properties;
using Signum.Entities.Reflection;
using Signum.Utilities.ExpressionTrees; 
using System.Text.RegularExpressions;

namespace Signum.Entities.DynamicQuery
{
    [Serializable]
    public abstract class QueryToken : IEquatable<QueryToken>
    {
        public abstract override string ToString();
        public abstract string NiceName();
        public abstract string Format { get; }
        public abstract string Unit { get; }
        public abstract Type Type { get; }
        public abstract string Key { get; }
        protected abstract QueryToken[] SubTokensInternal();

        public Expression BuildExpression(BuildExpressionContext context)
        {
            Expression result;
            if (context.Replacemens != null && context.Replacemens.TryGetValue(this, out result))
                return result;

            return BuildExpressionInternal(context); 
        }

        protected abstract Expression BuildExpressionInternal(BuildExpressionContext context);

        public abstract PropertyRoute GetPropertyRoute();
        public abstract Implementations Implementations();
        public abstract bool IsAllowed();

        public abstract QueryToken Clone();

        public QueryToken Parent { get; private set; }

        public QueryToken(QueryToken parent)
        {
            this.Parent = parent;
        }

        public static QueryToken NewColumn(ColumnDescription column)
        {
            return new ColumnToken(column);
        }

        public QueryToken[] SubTokens()
        {
            var result = this.SubTokensInternal();

            if (result == null)
                return null;

            return result.Where(t => t.IsAllowed()).ToArray();
        }

        protected QueryToken[] SubTokensBase(Type type, Implementations implementations)
        {
            if (type.UnNullify() == typeof(DateTime))
            {
                return DateTimeProperties(this, DateTimePrecision.Milliseconds);
            }

            Type cleanType = Reflector.ExtractLite(type) ?? type;
            if (cleanType.IsIIdentifiable())
            {
                if (implementations != null)
                {
                    if (implementations.IsByAll)
                        return null; // new[] { EntityPropertyToken.IdProperty(this) };

                    return ((ImplementedByAttribute)implementations).ImplementedTypes.Select(t => (QueryToken)new AsTypeToken(this, t)).ToArray();

                    //return new[] { EntityPropertyToken.IdProperty(this), EntityPropertyToken.ToStrProperty(this) }
                    //    .Concat(asPropesties).Concat(EntityProperties(cleanType)).ToArray();
                }

                return new[] { EntityPropertyToken.IdProperty(this), EntityPropertyToken.ToStrProperty(this) }
                    .Concat(EntityProperties(cleanType)).ToArray();
            }
            else if (cleanType.IsEmbeddedEntity())
            {
                return EntityProperties(cleanType).ToArray();
            }

            return null;
        }

        public static QueryToken[] DateTimeProperties(QueryToken parent, DateTimePrecision precission)
        {
            string utc = TimeZoneManager.Mode == TimeZoneMode.Utc ? "Utc - " : "";

            return new QueryToken[]
            {
                new NetPropertyToken(parent, ReflectionTools.GetPropertyInfo((DateTime dt)=>dt.Year), utc + Resources.Year), 
                new NetPropertyToken(parent, ReflectionTools.GetPropertyInfo((DateTime dt)=>dt.Month), utc + Resources.Month), 
                new MonthStartQueryToken(parent), 
                new NetPropertyToken(parent, ReflectionTools.GetPropertyInfo((DateTime dt)=>dt.Day), utc + Resources.Day),
                new DateQueryToken(parent), 
                precission < DateTimePrecision.Hours ? null: new NetPropertyToken(parent, ReflectionTools.GetPropertyInfo((DateTime dt)=>dt.Hour), utc + Resources.Hour), 
                precission < DateTimePrecision.Minutes ? null: new NetPropertyToken(parent, ReflectionTools.GetPropertyInfo((DateTime dt)=>dt.Minute), utc + Resources.Minute), 
                precission < DateTimePrecision.Seconds ? null: new NetPropertyToken(parent, ReflectionTools.GetPropertyInfo((DateTime dt)=>dt.Second), utc + Resources.Second), 
                precission < DateTimePrecision.Milliseconds? null: new NetPropertyToken(parent, ReflectionTools.GetPropertyInfo((DateTime dt)=>dt.Millisecond), utc + Resources.Millisecond), 
            }.NotNull().ToArray();
        }

        public static QueryToken[] CollectionProperties(QueryToken parent)
        {
            return new QueryToken[]
            {
                new NetPropertyToken(parent, parent.Type.GetProperty("Count", BindingFlags.Public| BindingFlags.Instance), Resources.Count),
                parent.HasAllOrAny() ?null: new CollectionElementToken(parent, CollectionElementType.Element),
                new CollectionElementToken(parent, CollectionElementType.Any),
                new CollectionElementToken(parent, CollectionElementType.All),
            }.NotNull().ToArray();
        }

        public virtual bool HasAllOrAny()
        {
            return Parent != null && Parent.HasAllOrAny(); 
        }

        IEnumerable<QueryToken> EntityProperties(Type type)
        {
            return Reflector.PublicInstancePropertiesInOrder(type)
                  .Where(p => Reflector.QueryableProperty(type, p))
                  .Select(p => (QueryToken)new EntityPropertyToken(this, p)).OrderBy(a => a.ToString());
        }

        static MethodInfo miToLite = ReflectionTools.GetMethodInfo((IdentifiableEntity ident) => ident.ToLite()).GetGenericMethodDefinition();
        protected static Expression ExtractEntity(Expression expression, bool idAndToStr)
        {
            if (Reflector.ExtractLite(expression.Type) != null)
            {
                MethodCallExpression mce = expression as MethodCallExpression;
                if (mce != null && mce.Method.IsInstantiationOf(miToLite))
                    return mce.Arguments[0];

                if (!idAndToStr)
                    return Expression.Property(expression, "Entity");
            }
            return expression;
        }

        protected static Expression BuildLite(Expression expression)
        {
            if (Reflector.IsIIdentifiable(expression.Type))
                return Expression.Call(miToLite.MakeGenericMethod(expression.Type), expression);

            return expression;
        }

        public static Type BuildLite(Type type)
        {
            if (Reflector.IsIIdentifiable(type))
                return Reflector.GenerateLite(type);

            return type;
        }

        public string FullKey()
        {
            if (Parent == null)
                return Key;

            return Parent.FullKey() + "." + Key;
        }

        public virtual QueryToken MatchPart(string key)
        {
            return key == Key ? this : null;
        }

        public override bool Equals(object obj)
        {
            return obj is QueryToken && obj.GetType() == this.GetType() && Equals((QueryToken)obj);
        }

        public bool Equals(QueryToken other)
        {
            return other != null && other.FullKey() == this.FullKey();
        }

        public override int GetHashCode()
        {
            return this.FullKey().GetHashCode();
        }
    }

    [Serializable]
    public class NetPropertyToken : QueryToken
    {
        public PropertyInfo PropertyInfo { get; private set; }
        public string DisplayName { get; private set; }

        internal NetPropertyToken(QueryToken parent, Expression<Func<object>> pi, string displayName): 
            this(parent, ReflectionTools.GetPropertyInfo(pi), displayName)
        {
        
        }

        internal NetPropertyToken(QueryToken parent, PropertyInfo pi, string displayName)
            : base(parent)
        {
            if (parent == null)
                throw new ArgumentNullException("parent");

            if (pi == null)
                throw new ArgumentNullException("pi");

            if (displayName == null)
                throw new ArgumentNullException("displayName");

            this.DisplayName = displayName;
            this.PropertyInfo = pi;
        }

        public override Type Type
        {
            get { return PropertyInfo.PropertyType; }
        }

        public override string ToString()
        {
            return DisplayName;
        }

        public override string Key
        {
            get { return PropertyInfo.Name; }
        }

        protected override Expression BuildExpressionInternal(BuildExpressionContext context)
        {
            var result = Parent.BuildExpression(context);

            return Expression.Property(result.UnNullify(), PropertyInfo);
        }

        protected override QueryToken[] SubTokensInternal()
        {
            return null;
        }

        public override string Format
        {
            get { return null; }
        }

        public override string Unit
        {
            get { return null; }
        }

        public override Implementations Implementations()
        {
            return null;
        }

        public override bool IsAllowed()
        {
            return Parent.IsAllowed();
        }

        public override PropertyRoute GetPropertyRoute()
        {
            return null;
        }

        public override string NiceName()
        {
            return DisplayName + Resources.Of + Parent.ToString();
        }

        public override QueryToken Clone()
        {
            return new NetPropertyToken(Parent.Clone(), PropertyInfo, DisplayName);
        }
    }

    [Serializable]
    public class EntityPropertyToken : QueryToken
    {
        public PropertyInfo PropertyInfo { get; private set; }
        public bool IsSpecial { get; private set; }
        
        public static QueryToken IdProperty(QueryToken parent)
        {
            return new EntityPropertyToken(parent, ReflectionTools.GetPropertyInfo((IdentifiableEntity e) => e.Id));
        }

        public static QueryToken ToStrProperty(QueryToken parent)
        {
            return new EntityPropertyToken(parent, ReflectionTools.GetPropertyInfo((IdentifiableEntity e) => e.ToStr));
        }

        internal EntityPropertyToken(QueryToken parent, PropertyInfo pi, bool isSpecial = false)
            : base(parent)
        {
            if (pi == null)
                throw new ArgumentNullException("pi");

            this.PropertyInfo = pi;

            this.IsSpecial = isSpecial;
        }

        public override Type Type
        {
            get { return BuildLite(PropertyInfo.PropertyType).Nullify(); }
        }

        public override string ToString()
        {
            if (IsSpecial)
                return "[{0}]".Formato(PropertyInfo.NiceName());

            return PropertyInfo.NiceName();
        }

        public override string Key
        {
            get { return PropertyInfo.Name; }
        }

        protected override Expression BuildExpressionInternal(BuildExpressionContext context)
        {
            var baseExpression = Parent.BuildExpression(context);

            if (PropertyInfo.Is((IdentifiableEntity ident) => ident.Id) ||
                PropertyInfo.Is((IdentifiableEntity ident) => ident.ToStr))
            {
                baseExpression = ExtractEntity(baseExpression, true);

                return Expression.Property(baseExpression, PropertyInfo.Name).Nullify(); // Late binding over Lite or Identifiable
            }

            baseExpression = ExtractEntity(baseExpression, false);

            Expression result = Expression.Property(baseExpression, PropertyInfo);

            return BuildLite(result).Nullify();
        }

        protected override QueryToken[] SubTokensInternal()
        {
            if (PropertyInfo.PropertyType.UnNullify() == typeof(DateTime))
            {  
                PropertyRoute route = this.GetPropertyRoute();

                if (route != null)
                {
                    var att = Validator.GetOrCreatePropertyPack(route.Parent.Type, route.PropertyInfo.Name).TryCC(pp =>
                        pp.Validators.OfType<DateTimePrecissionValidatorAttribute>().SingleOrDefault());
                    if (att != null)
                    {
                        return DateTimeProperties(this, att.Precision);
                    }
                }
            }

            if (Reflector.IsMList(PropertyInfo.PropertyType))
            {
                return NetPropertyToken.CollectionProperties(this);
            }

            return SubTokensBase(PropertyInfo.PropertyType, Implementations());
        }

        public override Implementations Implementations()
        {
            return GetPropertyRoute().GetImplementations();
        }

        public override string Format
        {
            get { return Reflector.FormatString(this.GetPropertyRoute()); }
        }

        public override string Unit
        {
            get { return PropertyInfo.SingleAttribute<UnitAttribute>().TryCC(u => u.UnitName); }
        }

        public override bool IsAllowed()
        {
            PropertyRoute route = GetPropertyRoute();

            return Parent.IsAllowed() && (route == null || route.IsAllowed());
        }

        public override PropertyRoute GetPropertyRoute()
        {
            PropertyRoute parent = Parent.GetPropertyRoute();
            if (parent == null)
                return null;

            Type type = Reflector.ExtractLite(parent.Type);
            if (type != null)
                return PropertyRoute.Root(type).Add(PropertyInfo);

            return parent.Add(PropertyInfo);
        }

        public override string NiceName()
        {
            return PropertyInfo.NiceName() + Resources.Of + Parent.ToString();
        }

        public override QueryToken Clone()
        {
            return new EntityPropertyToken(Parent.Clone(), PropertyInfo);
        }
    }

    [Serializable]
    public class AsTypeToken : QueryToken
    {
        Type type;
        internal AsTypeToken(QueryToken parent, Type type)
            : base(parent)
        {
            if (parent == null)
                throw new ArgumentNullException("parent");

            if (type == null)
                throw new ArgumentNullException("type");

            this.type = type;
        }

        public override Type Type
        {
            get { return BuildLite(type); }
        }

        public override string ToString()
        {
            return Resources.As0.Formato(Type.NiceName());
        }

        public override string Key
        {
            get { return "({0})".Formato(type.FullName.Replace(".", ":")); }
        }

        protected override Expression BuildExpressionInternal(BuildExpressionContext context)
        {
            Expression baseExpression = Parent.BuildExpression(context);

            Expression result = Expression.TypeAs(ExtractEntity(baseExpression, false), type);

            return BuildLite(result);
        }

        protected override QueryToken[] SubTokensInternal()
        {
            return SubTokensBase(type, null);
        }

        public override string Format
        {
            get { return null; }
        }

        public override string Unit
        {
            get { return null; }
        }

        public override Implementations Implementations()
        {
            return null;
        }

        public override bool IsAllowed()
        {
            return Parent.IsAllowed();
        }

        public override PropertyRoute GetPropertyRoute()
        {
            return PropertyRoute.Root(type);
        }

        public override string NiceName()
        {
            return Resources._0As1.Formato(Parent.ToString(), type.NiceName());
        }

        public override QueryToken Clone()
        {
            return new AsTypeToken(Parent.Clone(), Type); 
        }
    }

    [Serializable]
    public class ColumnToken : QueryToken
    {
        public ColumnDescription Column { get; private set; }

        internal ColumnToken(ColumnDescription column)
            : base(null)
        {
            if (column == null)
                throw new ArgumentNullException("column");

            this.Column = column;
        }

        public override string Key
        {
            get { return Column.Name; }
        }

        public override string ToString()
        {
            return Column.ToString();
        }

        public override Type Type
        {
            get { return Column.Type; }
        }

        public override string Format
        {
            get { return Column.Format; }
        }

        public override string Unit
        {
            get { return Column.Unit; }
        }

        protected override Expression BuildExpressionInternal(BuildExpressionContext context)
        {
            throw new InvalidOperationException("BuildExpressionInternal not supported for ColumnToken");
        }

        protected override QueryToken[] SubTokensInternal()
        {
            if (Column.Type.UnNullify() == typeof(DateTime))
            {
                if (Column.PropertyRoutes != null)
                {
                    DateTimePrecision? precission = 
                        Column.PropertyRoutes.Select(pr => Validator.GetOrCreatePropertyPack(pr.Parent.Type, pr.PropertyInfo.Name)
                        .Validators.OfType<DateTimePrecissionValidatorAttribute>().SingleOrDefault())
                        .Select(dtp => dtp.TryCS(d => d.Precision)).Distinct().Only();

                    if (precission != null)
                        return DateTimeProperties(this, precission.Value);
                }

                if (Column.Format == "d")
                    return DateTimeProperties(this, DateTimePrecision.Days);

            }

            return SubTokensBase(Column.Type, Column.Implementations);
        }

        public override Implementations Implementations()
        {
            return Column.Implementations;
        }

        public override bool IsAllowed()
        {
            return true;  //If it wasn't, sould be filtered before
        }

        public override PropertyRoute GetPropertyRoute()
        {
            if (Column.PropertyRoutes != null)
                return Column.PropertyRoutes[0]; //HACK: compatibility with IU entitiy elements

            Type type = Reflector.ExtractLite(Type);
            if (type != null && typeof(IdentifiableEntity).IsAssignableFrom(type))
                return PropertyRoute.Root(type);

            return null;
        }

        public override string NiceName()
        {
            return Column.DisplayName;
        }

        public override QueryToken Clone()
        {
            return new ColumnToken(Column);
        }
    }

    [Serializable]
    public class MonthStartQueryToken : QueryToken
    {
        internal MonthStartQueryToken(QueryToken parent)
            : base(parent)
        {
        }

        public override string ToString()
        {
            return Resources.MonthStart;
        }

        public override string NiceName()
        {
            return Resources.MonthStart + Resources.Of + Parent.ToString();
        }

        public override string Format
        {
            get { return "Y"; }
        }

        public override string Unit
        {
            get { return null; }
        }

        public override Type Type
        {
            get { return typeof(DateTime?); }
        }

        public override string Key
        {
            get { return "MonthStart"; }
        }

        protected override QueryToken[] SubTokensInternal()
        {
            return null;
        }

        static MethodInfo miMonthStart = ReflectionTools.GetMethodInfo(() => DateTimeExtensions.MonthStart(DateTime.MinValue));

        protected override Expression BuildExpressionInternal(BuildExpressionContext context)
        {
            var exp = Parent.BuildExpression(context);
            
            return Expression.Call(miMonthStart, exp.UnNullify()).Nullify();
        }

        public override PropertyRoute GetPropertyRoute()
        {
            return Parent.GetPropertyRoute();
        }

        public override Implementations Implementations()
        {
            return null;
        }

        public override bool IsAllowed()
        {
            return Parent.IsAllowed();
        }

        public override QueryToken Clone()
        {
            return new MonthStartQueryToken(Parent.Clone());
        }
    }


    [Serializable]
    public class DateQueryToken : QueryToken
    {
        internal DateQueryToken(QueryToken parent)
            : base(parent)
        {
        }

        public override string ToString()
        {
            return Resources.Date;
        }

        public override string NiceName()
        {
            return Resources.Date + Resources.Of + Parent.ToString();
        }

        public override string Format
        {
            get { return "d"; }
        }

        public override string Unit
        {
            get { return null; }
        }

        public override Type Type
        {
            get { return typeof(DateTime?); }
        }

        public override string Key
        {
            get { return "Date"; }
        }

        protected override QueryToken[] SubTokensInternal()
        {
            return null;
        }

        static PropertyInfo miDate = ReflectionTools.GetPropertyInfo((DateTime d) => d.Date);

        protected override Expression BuildExpressionInternal(BuildExpressionContext context)
        {
            var exp = Parent.BuildExpression(context);

            return Expression.Property(exp.UnNullify(), miDate).Nullify();
        }

        public override PropertyRoute GetPropertyRoute()
        {
            return Parent.GetPropertyRoute();
        }

        public override Implementations Implementations()
        {
            return null;
        }

        public override bool IsAllowed()
        {
            return Parent.IsAllowed();
        }

        public override QueryToken Clone()
        {
            return new DateQueryToken(Parent.Clone()); 
        }
    }

    [ForceLocalization]
    public enum CollectionElementType
    {
        Element,
        Any,
        All
    }

    [Serializable]
    public class CollectionElementToken : QueryToken
    {
        public CollectionElementType ElementType { get; private set; }

        internal CollectionElementToken(QueryToken parent, CollectionElementType type)
            : base(parent)
        {
            if (parent.Type.ElementType() == null)
                throw new InvalidOperationException("not a collection");

            this.ElementType = type; 
        }

        public override Type Type
        {
            get { return BuildLite(Parent.Type.ElementType().Nullify()); }
        }

        public override string ToString()
        {
            return ElementType.NiceToString();
        }

        public override string Key
        {
            get { return ElementType.ToString(); }
        }

      

        protected override QueryToken[] SubTokensInternal()
        {
            if (Type.ElementType() != null)
            {
                return NetPropertyToken.CollectionProperties(this);
            }

            return SubTokensBase(Type, Implementations());
        }

        public override Implementations Implementations()
        {
            return Parent.Implementations();
        }

        public override string Format
        {
            get { return Parent.Format; }
        }

        public override string Unit
        {
            get { return Parent.Unit; }
        }

        public override bool IsAllowed()
        {
            return Parent.IsAllowed(); 
        }

        public override bool HasAllOrAny()
        {
            return ElementType == CollectionElementType.All || ElementType == CollectionElementType.Any;
        }

        public override PropertyRoute GetPropertyRoute()
        {
            PropertyRoute parent = Parent.GetPropertyRoute();
            if (parent == null)
                return null;

            return parent.Add("Item");
        }

        public override string NiceName()
        {
            if(ElementType != CollectionElementType.Element)
                throw new InvalidOperationException("NiceName not supported for {0}".Formato(ElementType));

            Type parentElement = Parent.Type.ElementType().CleanType();

            if (parentElement.IsModifiableEntity())
                return parentElement.NiceName();

            return "Element of " + Parent.NiceName();
        }

        public override QueryToken Clone()
        {
            return new CollectionElementToken(Parent.Clone(), ElementType);
        }

        static MethodInfo miAnyE = ReflectionTools.GetMethodInfo((IEnumerable<string> col) => col.Any(null)).GetGenericMethodDefinition();
        static MethodInfo miAllE = ReflectionTools.GetMethodInfo((IEnumerable<string> col) => col.All(null)).GetGenericMethodDefinition();
        static MethodInfo miAnyQ = ReflectionTools.GetMethodInfo((IQueryable<string> col) => col.Any(null)).GetGenericMethodDefinition();
        static MethodInfo miAllQ = ReflectionTools.GetMethodInfo((IQueryable<string> col) => col.All(null)).GetGenericMethodDefinition();

        protected override Expression BuildExpressionInternal(BuildExpressionContext context)
        {
            throw new InvalidOperationException("CollectionElementToken does not support this method");
        }

        internal Expression BuildExpressionLambda(BuildExpressionContext context, LambdaExpression lambda)
        {
            MethodInfo mi = typeof(IQueryable).IsAssignableFrom(Parent.Type) ? (ElementType == CollectionElementType.All ? miAllQ: miAnyQ ) : 
                                                                               (ElementType == CollectionElementType.All ? miAllE: miAnyE );

            var collection = Parent.BuildExpression(context);

            return Expression.Call(mi.MakeGenericMethod(Parent.Type.ElementType()), collection, lambda);
        }

        internal ParameterExpression CreateParameter()
        {
            return Expression.Parameter(Parent.Type.ElementType());
        }

        internal Expression CreateExpression(ParameterExpression parameter)
        {
            return BuildLite(parameter).Nullify();
        }

        public static List<CollectionElementToken> GetElements(HashSet<QueryToken> allTokens)
        {
            return allTokens
                .SelectMany(t => t.FollowC(tt => tt.Parent))
                .OfType<CollectionElementToken>()
                .Where(a => a.ElementType == CollectionElementType.Element)
                .Distinct()
                .OrderBy(a => a.FullKey().Length)
                .ToList();
        }

        public static string MultipliedMessage(List<CollectionElementToken> elements, Type entityType)
        {
            if(elements.Empty())
                return null;


            return "The number of {0} is being multiplied by {1}".Formato(entityType.NiceName(), elements.CommaAnd(a => a.Parent.ToString()));
        }
    }

    public class BuildExpressionContext
    {
        public BuildExpressionContext(Type tupleType, ParameterExpression parameter, Dictionary<QueryToken, Expression> replacemens)
        {
            this.Parameter = parameter;
            this.Replacemens = replacemens; 
        }

        public readonly Type TupleType;
        public readonly ParameterExpression Parameter;
        public readonly Dictionary<QueryToken, Expression> Replacemens; 
    }
}

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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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