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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
Northwind.zip
SignumFramework2.0-src.zip
signumframework-signumframework-c6436e1
.gitignore
Local.testsettings
README.md
Signum.Engine
ClassDiagram1.cd
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Schema.cd
SchemaBuilder
SignumFramework.pfx
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Diagram.cd
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Reflection
Services
SignumFramework.pfx
Signum.Framework.vsmdi
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ClassDiagram1.cd
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ExpressionTrees
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SignumFramework.pfx
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ColorUtils
Converters
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Images
admin.png
alert.png
calendar.png
cancel.png
close.png
entity.png
find.png
forbidden.png
newColumn.png
newFilter.png
note.png
ok.png
pin.png
reload.png
save.png
star.png
Localization
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SignumFrameworkSetup.vdproj
logo.ico
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Snippets
DroidSansMono.ttf
RazorSingleFileGenerator.vsix
Signum.Fonts.vssettings
T4template
entity.snippet
entityWithName.snippet
expressionMethod.snippet
expressionMethodQuery.snippet
expressionProperty.snippet
field.snippet
fieldCreacion.snippet
fieldEuro.snippet
fieldInicioFin.snippet
fieldString.snippet
fiff.snippet
propiedad.snippet
tran.snippet
Template
EntityControlTemplate
MyTemplate.vstemplate
SignumEntityControl.zip
__TemplateIcon.ico
Template
MyTemplate.vstemplate
ProjectName.Entities
MyTemplate.vstemplate
Properties
__TemplateIcon.ico
ProjectName.Load
MyTemplate.vstemplate
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Settings.settings
__TemplateIcon.ico
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__TemplateIcon.ico
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ui-bg_flat_0_aaaaaa_40x100.png
ui-bg_flat_75_ffffff_40x100.png
ui-bg_glass_55_fbf9ee_1x400.png
ui-bg_glass_65_ffffff_1x400.png
ui-bg_glass_75_dadada_1x400.png
ui-bg_glass_75_e6e6e6_1x400.png
ui-bg_glass_95_fef1ec_1x400.png
ui-bg_highlight-soft_75_cccccc_1x100.png
ui-icons_222222_256x240.png
ui-icons_2e83ff_256x240.png
ui-icons_454545_256x240.png
ui-icons_888888_256x240.png
ui-icons_cd0a0a_256x240.png
Controllers
Global.asax
MyTemplate.vstemplate
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Settings.settings
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Views
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__TemplateIcon.ico
favicon.ico
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MyTemplate.vstemplate
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Settings.settings
__TemplateIcon.ico
SignumFramework2ClientServer.zip
__TemplateIcon.ico
WizardProjectName
Test
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Settings.settings
WizardProjectName
Isolated
Properties
SignumFramework.pfx
TraceAndTestImpact.testsettings
SignumFramework2Setup.zip
Southwind-Part2-Logic.zip
Southwind
Southwind.Entities
Properties
Southwind.Load
Properties
Settings.settings
Southwind.Logic
Properties
Southwind.Web
Code
Content
smoothness
images
ui-bg_flat_0_aaaaaa_40x100.png
ui-bg_flat_75_ffffff_40x100.png
ui-bg_glass_55_fbf9ee_1x400.png
ui-bg_glass_65_ffffff_1x400.png
ui-bg_glass_75_dadada_1x400.png
ui-bg_glass_75_e6e6e6_1x400.png
ui-bg_glass_95_fef1ec_1x400.png
ui-bg_highlight-soft_75_cccccc_1x100.png
ui-icons_222222_256x240.png
ui-icons_2e83ff_256x240.png
ui-icons_454545_256x240.png
ui-icons_888888_256x240.png
ui-icons_cd0a0a_256x240.png
Controllers
Global.asax
Properties
Settings.settings
Scripts
ServerSouthwind.svc
Views
Home
Shared
Southwind
favicon.ico
Southwind.Windows
Controls
Properties
Settings.settings
Southwind.zip
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Resources;
using System.Text;
using System.Text.RegularExpressions;
using Signum.Entities.Properties;
using Signum.Entities.Reflection;
using Signum.Utilities;
using Signum.Utilities.ExpressionTrees;
using Signum.Utilities.Reflection;
using System.Globalization;

namespace Signum.Entities
{
    [AttributeUsage(AttributeTargets.Property, Inherited = true, AllowMultiple = true)]
    public abstract class ValidatorAttribute : Attribute
    {
        public bool DisableOnCorrupt { get; set; }
        public string ErrorMessage { get; set; }

        public int Order { get; set; }

        //Descriptive information that continues the sentence: The property should {HelpMessage}
        //Used for documentation purposes only
        public abstract string HelpMessage { get; }

        public string Error(PropertyInfo property, object value)
        {
            if (DisableOnCorrupt && !Corruption.Strict)
                return null;

            string defaultError = OverrideError(value);

            if (defaultError == null)
                return null;

            string error = GetLocalizedErrorMessage(property, this) ?? ErrorMessage ?? defaultError;
            if (error != null)
                error = error.Formato(property.NiceName());

            return error; 
        }

        static string GetLocalizedErrorMessage(PropertyInfo property, ValidatorAttribute validator)
        {
            Assembly assembly = property.DeclaringType.Assembly;
            if (assembly.HasAttribute<LocalizeDescriptionsAttribute>())
            {
                string key = property.DeclaringType.Name.Add(property.Name, "_").Add(validator.GetType().Name, "_");
                string result = assembly.GetDefaultResourceManager().GetString(key);
                if (result != null)
                    return result;
            }

            return null;
        }

        /// <summary>
        /// When overriden, validates the value against this validator rule
        /// </summary>
        /// <param name="value"></param>
        /// <returns>returns an string with the error message, using {0} if you want the property name to be inserted</returns>
        protected abstract string OverrideError(object value);
    }

    public class NotNullValidatorAttribute : ValidatorAttribute
    {
        protected override string OverrideError(object obj)
        {
            if (obj == null)
                return Resources._0IsNotSet;

            return null;
        }

        public override string HelpMessage
        {
            get { return Resources.BeNotNull; }
        }
    }

    public class StringLengthValidatorAttribute : ValidatorAttribute
    {
        int min = -1;
        int max = -1;
        bool allowNulls = false;

        public bool AllowNulls
        {
            get { return allowNulls; }
            set { allowNulls = value; }
        }

        public int Min
        {
            get { return min; }
            set { min = value; }
        }

        public int Max
        {
            get { return max; }
            set { max = value; }
        }

        protected override string OverrideError(object value)
        {
            string val = (string)value;

            if (string.IsNullOrEmpty(val))
                return allowNulls ? null : Resources._0IsNotSet;

            if (min == max && min != -1 && val.Length != min)
                return Resources.TheLenghtOf0HasToBeEqualTo0.Formato(min);

            if (min != -1 && val.Length < min)
                return Resources.TheLengthOf0HasToBeGreaterOrEqualTo0.Formato(min);

            if (max != -1 && val.Length > max)
                return Resources.TheLengthOf0HasToBeLesserOrEqualTo0.Formato(max);

            return null;
        }

        public override string HelpMessage
        {
            get
            {
                string result =
                    min != -1 && max != -1 ? Resources.HaveBetween0And1Characters.Formato(min, max) :
                    min != -1 ? Resources.HaveMinimum0Characters.Formato(min) :
                    max != -1 ? Resources.HaveMaximun0Characters.Formato(max) : null;

                if (allowNulls)
                    result = result.Add(Resources.OrBeNull, " ");

                return result;
            }
        }
    }


    public class RegexValidatorAttribute : ValidatorAttribute
    {
        Regex regex;
        public RegexValidatorAttribute(Regex regex)
        {
            this.regex = regex;
        }

        public RegexValidatorAttribute(string regexExpresion)
        {
            this.regex = new Regex(regexExpresion);
        }

        string formatName;
        public string FormatName
        {
            get { return formatName; }
            set { formatName = value; }
        }

        protected override string OverrideError(object value)
        {
            string str = (string)value;
            if (string.IsNullOrEmpty(str))
                return null;

            if (regex.IsMatch(str))
                return null;

            if (formatName == null)
                return Resources._0HasNoCorrectFormat;
            else
                return Resources._0DoesNotHaveAValid0Format.Formato(formatName);
        }

        public override string HelpMessage
        {
            get
            {
                return Resources.HaveValid0Format.Formato(formatName);
            }
        }
    }

    public class EMailValidatorAttribute : RegexValidatorAttribute
    {
        public static readonly Regex EmailRegex = new Regex(@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
                          @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
                          @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$", RegexOptions.IgnoreCase);

        public EMailValidatorAttribute()
            : base(EmailRegex)
        {
            this.FormatName = "e-Mail";
        }
    }

    public class TelephoneValidatorAttribute : RegexValidatorAttribute
    {
        public static readonly Regex TelephoneRegex = new Regex(@"^((\+|00)\d\d)? *(\([ 0-9]+\))? *[0-9][ \-0-9]+$");

        public TelephoneValidatorAttribute()
            : base(TelephoneRegex)
        {
            this.FormatName = Resources.Telephone;
        }
    }

    public class URLValidatorAttribute : RegexValidatorAttribute
    {
        public static readonly Regex URLRegex = new Regex(
              "^(https?://)"
            + "?(([0-9a-z_!~*'().&=+$%-]+: )?[0-9a-z_!~*'().&=+$%-]+@)?" //user@ 
            + @"(([0-9]{1,3}\.){3}[0-9]{1,3}" // IP- 199.194.52.184 
            + "|" // allows either IP or domain 
            + @"([0-9a-z_!~*'()-]+\.)*" // tertiary domain(s)- www. 
            + @"([0-9a-z][0-9a-z-]{0,61})?[0-9a-z]" // second level domain 
            + @"(\.[a-z]{2,6})?)" // first level domain- .com or .museum 
            + "(:[0-9]{1,4})?" // port number- :80 
            + "((/?)|" // a slash isn't required if there is no file name 
            + "(/[0-9a-z_!~*'().;?:@&=+$,%#-]+)+/?)$", RegexOptions.IgnoreCase);

        public URLValidatorAttribute()
            : base(URLRegex)
        {
            this.FormatName = "URL";
        }
    }

    public class FileNameValidatorAttribute : RegexValidatorAttribute
    {
        public static readonly Regex FileNameRegex = new Regex(@"^(?!^(PRN|AUX|CLOCK\$|NUL|CON|COM\d|LPT\d|\..*)(\..+)?$)[^\x00-\x1f\\?*:\"";|/]+$");
        public FileNameValidatorAttribute()
            : base(FileNameRegex)
        {
            this.FormatName = Resources.FileName;
        }
    }

    public class DecimalsValidatorAttribute : ValidatorAttribute
    {
        public int DecimalPlaces { get; set; }

        public DecimalsValidatorAttribute()
        {
            DecimalPlaces = 2;
        }

        public DecimalsValidatorAttribute(int decimalPlaces)
        {
            this.DecimalPlaces = decimalPlaces;
        }

        protected override string OverrideError(object value)
        {
            if (value == null)
                return null;

            if (value is decimal && Math.Round((decimal)value, DecimalPlaces) != (decimal)value)
            {
                return Resources._0HasMoreThan0DecimalPlaces.Formato(DecimalPlaces);
            }

            return null;
        }

        public override string HelpMessage
        {
            get { return Resources.Have0Decimals.Formato(DecimalPlaces); }
        }
    }


    public class NumberIsValidatorAttribute : ValidatorAttribute
    {
        public ComparisonType ComparisonType;
        public IComparable number;

        public NumberIsValidatorAttribute(ComparisonType comparison, float number)
        {
            this.ComparisonType = comparison;
            this.number = number;
        }

        public NumberIsValidatorAttribute(ComparisonType comparison, double number)
        {
            this.ComparisonType = comparison;
            this.number = number;
        }

        public NumberIsValidatorAttribute(ComparisonType comparison, byte number)
        {
            this.ComparisonType = comparison;
            this.number = number;
        }

        public NumberIsValidatorAttribute(ComparisonType comparison, short number)
        {
            this.ComparisonType = comparison;
            this.number = number;
        }

        public NumberIsValidatorAttribute(ComparisonType comparison, int number)
        {
            this.ComparisonType = comparison;
            this.number = number;
        }

        public NumberIsValidatorAttribute(ComparisonType comparison, long number)
        {
            this.ComparisonType = comparison;
            this.number = number;
        }

        protected override string OverrideError(object value)
        {
            if (value == null)
                return null;

            IComparable val = (IComparable)value;

            if (number.GetType() != value.GetType())
                number = (IComparable)Convert.ChangeType(number, value.GetType()); // asi se hace solo una vez 

            bool ok = (ComparisonType == ComparisonType.EqualTo && val.CompareTo(number) == 0) ||
                      (ComparisonType == ComparisonType.DistinctTo && val.CompareTo(number) != 0) ||
                      (ComparisonType == ComparisonType.GreaterThan && val.CompareTo(number) > 0) ||
                      (ComparisonType == ComparisonType.GreaterThanOrEqual && val.CompareTo(number) >= 0) ||
                      (ComparisonType == ComparisonType.LessThan && val.CompareTo(number) < 0) ||
                      (ComparisonType == ComparisonType.LessThanOrEqual && val.CompareTo(number) <= 0);

            if (ok)
                return null;

            return Resources._0HasToBe0Than1.Formato(ComparisonType.NiceToString(), number.ToString());
        }

        public override string HelpMessage
        {
            get { return Resources.Be + ComparisonType.NiceToString() + " " + number.ToString(); }
        }
    }

    //Not using C intervals to please user!
    public class NumberBetweenValidatorAttribute : ValidatorAttribute
    {
        IComparable min;
        IComparable max;

        public NumberBetweenValidatorAttribute(float min, float max)
        {
            this.min = min;
            this.max = max;
        }

        public NumberBetweenValidatorAttribute(double min, double max)
        {
            this.min = min;
            this.max = max;
        }

        public NumberBetweenValidatorAttribute(byte min, byte max)
        {
            this.min = min;
            this.max = max;
        }

        public NumberBetweenValidatorAttribute(short min, short max)
        {
            this.min = min;
            this.max = max;
        }

        public NumberBetweenValidatorAttribute(int min, int max)
        {
            this.min = min;
            this.max = max;
        }

        public NumberBetweenValidatorAttribute(long min, long max)
        {
            this.min = min;
            this.max = max;
        }

        protected override string OverrideError(object value)
        {
            if (value == null)
                return null;

            IComparable val = (IComparable)value;

            if (min.GetType() != value.GetType())
            {
                min = (IComparable)Convert.ChangeType(min, val.GetType()); // asi se hace solo una vez 
                max = (IComparable)Convert.ChangeType(max, val.GetType());
            }

            if (min.CompareTo(val) <= 0 &&
                val.CompareTo(max) <= 0)
                return null;

            return Resources._0HasToBeBetween0And1.Formato(min, max);
        }

        public override string HelpMessage
        {
            get { return Resources.BeBetween0And1.Formato(min, max); }
        }
    }

    public class NoRepeatValidatorAttribute : ValidatorAttribute
    {
        protected override string OverrideError(object value)
        {
            IList list = (IList)value;
            if (list == null || list.Count <= 1)
                return null;
            string ex = list.Cast<object>().GroupCount().Where(kvp => kvp.Value > 1).ToString(e => "{0} x {1}".Formato(e.Key, e.Value), ", ");
            if (ex.HasText())
                return Properties.Resources._0HasSomeRepeatedElements0.Formato(ex);
            return null;
        }

        public override string HelpMessage
        {
            get { return Resources.HaveNoRepeatedElements; }
        }
    }

    public class CountIsValidatorAttribute : ValidatorAttribute
    {
        public ComparisonType ComparisonType;
        public int number;

        public CountIsValidatorAttribute(ComparisonType comparison, int number)
        {
            this.ComparisonType = comparison;
            this.number = number;
        }

        protected override string OverrideError(object value)
        {
            IList list = (IList)value;
            if (list == null)
                return null;

            int val = list.Count;

            if ((ComparisonType == ComparisonType.EqualTo && val.CompareTo(number) == 0) ||
                (ComparisonType == ComparisonType.DistinctTo && val.CompareTo(number) != 0) ||
                (ComparisonType == ComparisonType.GreaterThan && val.CompareTo(number) > 0) ||
                (ComparisonType == ComparisonType.GreaterThanOrEqual && val.CompareTo(number) >= 0) ||
                (ComparisonType == ComparisonType.LessThan && val.CompareTo(number) < 0) ||
                (ComparisonType == ComparisonType.LessThanOrEqual && val.CompareTo(number) <= 0))
                return null;

            return Resources.TheNumberOfElementsOf0HasToBe01.Formato(ComparisonType.NiceToString(), number.ToString());
        }

        public override string HelpMessage
        {
            get { return Resources.HaveANumberOfElements01.Formato(ComparisonType.NiceToString(), number.ToString()); }
        }
    }

    public class DaysPrecissionValidatorAttribute : DateTimePrecissionValidatorAttribute
    {
        public DaysPrecissionValidatorAttribute()
            : base(DateTimePrecision.Days)
        { }
    }

    public class SecondsPrecissionValidatorAttribute : DateTimePrecissionValidatorAttribute
    {
        public SecondsPrecissionValidatorAttribute()
            : base(DateTimePrecision.Seconds)
        { }
    }

    public class MinutesPrecissionValidatorAttribute : DateTimePrecissionValidatorAttribute
    {
        public MinutesPrecissionValidatorAttribute()
            : base(DateTimePrecision.Minutes)
        { }

    }
    public class DateTimePrecissionValidatorAttribute : ValidatorAttribute
    {

        public DateTimePrecision Precision { get; private set; }

        public DateTimePrecissionValidatorAttribute(DateTimePrecision precision)
        {
            this.Precision = precision;
        }

        protected override string OverrideError(object value)
        {
            if (value == null)
                return null;

            var prec = ((DateTime)value).GetPrecision();
            if (prec > Precision)
                return "{{0}} has a precission of {0} instead of {1}".Formato(prec, Precision);

            return null;
        }

        public string FormatString
        {
            get
            {
                var dtfi = CultureInfo.CurrentCulture.DateTimeFormat;
                switch (Precision)
                {
                    case DateTimePrecision.Days: return "d";
                    case DateTimePrecision.Hours: return dtfi.ShortDatePattern + " " + "HH";
                    case DateTimePrecision.Minutes: return "g";
                    case DateTimePrecision.Seconds: return "G";
                    case DateTimePrecision.Milliseconds: return dtfi.ShortDatePattern + " " + dtfi.LongTimePattern + ".fff";
                    default: return "";
                }
            }
        }

        public override string HelpMessage
        {
            get
            {
                return Resources.HaveAPrecisionOf + " " + Precision.NiceToString().ToLower();
            }
        }
    }

    public class StringCaseValidatorAttribute : ValidatorAttribute
    {
        private Case textCase;
        public Case TextCase
        {
            get { return this.textCase; }
            set { this.textCase = value; }
        }

        public StringCaseValidatorAttribute(Case textCase)
        {
            this.textCase = textCase;
        }

        protected override string OverrideError(object value)
        {
            if (string.IsNullOrEmpty((string)value)) return null;

            string str = (string)value;

            if ((this.textCase == Case.Uppercase) && (str != str.ToUpper()))
                return Resources._0HasToBeUppercase;

            if ((this.textCase == Case.Lowercase) && (str != str.ToLower()))
                return Resources._0HasToBeLowercase;

            return null;
        }

        public override string HelpMessage
        {
            get { return Resources.Be + (textCase == Case.Uppercase ? Resources.Uppercase : Resources.Lowercase); }
        }
    }

    public enum Case
    {
        Uppercase,
        Lowercase
    }

    public enum ComparisonType
    {
        EqualTo,
        DistinctTo,
        GreaterThan,
        GreaterThanOrEqual,
        LessThan,
        LessThanOrEqual,
    }

    public class StateValidator<E, S> : IEnumerable
        where E : ModifiableEntity
        where S : struct
    {
        Func<E, S> getState;
        string[] propertyNames;
        string[] propertyNiceNames;
        Func<E, object>[] getters;

        Dictionary<S, bool?[]> dictionary = new Dictionary<S, bool?[]>();

        public StateValidator(Func<E, S> getState, params Expression<Func<E, object>>[] properties)
        {
            this.getState = getState;
            PropertyInfo[] pis = properties.Select(p => ReflectionTools.GetPropertyInfo(p)).ToArray();
            propertyNames = pis.Select(pi => pi.Name).ToArray();
            propertyNiceNames = pis.Select(pi => pi.NiceName()).ToArray();
            getters = properties.Select(p => p.Compile()).ToArray();
        }

        public void Add(S state, params bool?[] necessary)
        {
            if (necessary != null && necessary.Length != propertyNames.Length)
                throw new ArgumentException("The StateValidator {0} for state {1} has {2} values instead of {3}"
                    .Formato(GetType().TypeName(), state, necessary.Length, propertyNames.Length));

            dictionary.Add(state, necessary);
        }

        public string Validate(E entity, PropertyInfo pi)
        {
            return Validate(entity, pi, true);
        }

        public bool? IsAllowed(S state, PropertyInfo pi)
        {
            int index = propertyNames.IndexOf(pi.Name);
            if (index == -1)
                return null;

            return dictionary.GetOrThrow(state, Resources.State0NotRegisteredInStateValidator)[index];
        }

        public string Validate(E entity, PropertyInfo pi, bool showState)
        {
            int index = propertyNames.IndexOf(pi.Name);
            if (index == -1)
                return null;

            S state = getState(entity);

            bool? necessary = dictionary.GetOrThrow(state, Resources.State0NotRegisteredInStateValidator)[index];

            if (necessary == null)
                return null;

            object val = getters[index](entity);
            if (val is IList && ((IList)val).Count == 0 || val is string && ((string)val).Length == 0) //both are indistinguible after retrieving
                val = null;

            if (val != null && !necessary.Value)
                return showState ? Resources._0IsNotAllowedOnState1.Formato(propertyNiceNames[index], state) :
                                   Resources._0IsNotAllowed.Formato(propertyNiceNames[index]);

            if (val == null && necessary.Value)
                return showState ? Resources._0IsNecessaryOnState1.Formato(propertyNiceNames[index], state) :
                                   Resources._0IsNecessary.Formato(propertyNiceNames[index]);

            return null;
        }

        public bool? Necessary(S state, PropertyInfo pi)
        {
            int index = propertyNames.IndexOf(pi.Name);
            if (index == -1)
                throw new ArgumentException("The property is not registered");

            return dictionary[state][index];
        }

        public IEnumerator GetEnumerator() //just to use object initializer
        {
            throw new NotImplementedException();
        }
    }

}

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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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