BUY Clonidine ONLINE WITHOUT PRESCRIPTION, I blogged about fluent interfaces and expression builders a couple of times before. Buying Clonidine online over the counter, For this post, I want to share a base class that I've been using for taking away some of the burden when creating expression builders for domain classes.

Here's the expression I'm after:

var document = DocumentBuilder.BuildDocument()    .AuthoredBy("Stephen Hawking")    .Titled("The Universe in a Nutshell")    .TaggedWith(tag => tag.Named("Physics"))    .Build();

This creates an instance of a domain class named Document with the name of the author, buy cheap Clonidine no rx, Where can i order Clonidine without prescription, its title and with an associated tag. Let me first show the code of the expression builders that make this happen.

public interface IDocumentAuthorBuilder{    IDocumentTitleBuilder AuthoredBy(String author);}

public interface IDocumentTitleBuilder{    IDocumentTagBuilder Titled(String title);}
public interface IDocumentTagBuilder : IBuilder<Document>{    IDocumentTagBuilder TaggedWith(Action<ITagBuilder>

                                                buildUsing);}
public class DocumentBuilder : Builder<Document>, order Clonidine from mexican pharmacy, Clonidine trusted pharmacy reviews, IDocumentAuthorBuilder,                               IDocumentTitleBuilder, online buying Clonidine hcl, Purchase Clonidine online, IDocumentTagBuilder{    private DocumentBuilder()    {}
    public static IDocumentAuthorBuilder BuildDocument()    {        return new DocumentBuilder();    }
    IDocumentTitleBuilder AuthoredBy(String author)    {        ProvideValueFor(document => document.Author, author);        return this;    }
    IDocumentTagBuilder Titled(String title)    {        ProvideValueFor(document => document.Title, order Clonidine online overnight delivery no prescription, Rx free Clonidine, title);        return this;    }
    public IDocumentTagBuilder TaggedWith(Action<ITagBuilder>

                                                    buildUsing)    {        var tagBuilder = new TagBuilder(tag =>

            ProvideValueFor(document => document.Tags, tag));
        buildUsing(tagBuilder);        return this;    }}


public interface ITagBuilder{    void Named(String name);}
public class TagBuilder : ITagBuilder{    private readonly Action<Tag> _afterBuildAction;
    public TagBuilder(Action<Tag> afterBuildAction)    {        _afterBuildAction = afterBuildAction;    }
    public void Named(String name)    {        var tag = new Tag(name);        _afterBuildAction(tag);    }}

The expression builders all provide progressive interfaces, where can i buy cheapest Clonidine online. Order Clonidine no prescription, Also notice that the DocumentBuilder derives from a base class named Builder. This class provides a method ProvideValueFor that is used to feed the base class with the name of a property and a corresponding value. Collections are also supported, canada, mexico, india. Here's the code for the Builder class, BUY Clonidine ONLINE WITHOUT PRESCRIPTION. Buy Clonidine no prescription,

public interface IBuilder<T>{    T Build();}

public abstract class Builder<T> : IBuilder<T>{    private Dictionary<PropertyInfo, Object> PropertiesAndValues

    { get; set; }
    protected Builder()    {        PropertiesAndValues =

            new Dictionary<PropertyInfo, buy Clonidine from mexico, Clonidine gel, ointment, cream, pill, spray, continuous-release, extended-release, Object>();    }
    public static implicit operator T(Builder<T> builder)    {        return builder.Build();    }
    protected void ProvideValueFor(Expression<Func<T, Object>> expression, comprar en línea Clonidine, comprar Clonidine baratos, Buy Clonidine ONLINE WITHOUT prescription, Object value)    {        var property = ReflectionHelper.GetProperty(expression);
        if(false == PropertiesAndValues.ContainsKey(property))            RegisterPropertyAndValue(property, value);        else            SetPropertyAndValue(property, order Clonidine no prescription, Buy cheap Clonidine, value);    }
    private void SetPropertyAndValue(PropertyInfo property,

                                     Object value)    {        if(IsCollection(property))        {            var values = (List<Object>) PropertiesAndValues[property];            values.Add(value);        }        else        {            PropertiesAndValues[property] = value;

        }    }
    private void RegisterPropertyAndValue(PropertyInfo property, order Clonidine online overnight delivery no prescription, Where can i find Clonidine online, Object value)    {        if(IsCollection(property))            PropertiesAndValues.Add(property,

                                    new List<Object>() { value });

        else            PropertiesAndValues.Add(property, order Clonidine from mexican pharmacy, Buy Clonidine without prescription, value);

    }
    private static Boolean IsCollection(PropertyInfo property)    {        if(property.PropertyType == typeof(String))            return false;
        var collectionType = typeof(IEnumerable<>);        return IsCollectionOfType(collectionType,

                                  property.PropertyType);    }
    private static Boolean IsCollection(FieldInfo field)    {        var collectionType = typeof(ICollection<>);        return IsCollectionOfType(collectionType, online buying Clonidine hcl, Where can i buy Clonidine online, field.FieldType);    }
    private static Boolean IsCollectionOfType(Type collectionType,

                                              Type type)    {        if(collectionType.Name == type.Name)            return true;
        var interfaces = type.GetInterfaces();        return interfaces.Has(@interface =>

            @interface.Name == collectionType.Name);

    }
    public T Build()    {        var typeToBuild = typeof(T);        if(false == HasParameterlessConstructor(typeToBuild))            throw new InvalidOperationException(                "No parameterless constructor.");
        var instance = (T)Activator.CreateInstance(typeToBuild, where can i order Clonidine without prescription, Buy Clonidine from canada, true);        foreach(var entry in PropertiesAndValues)        {            var property = entry.Key;            if(IsCollection(property))                SetCollectionValuesFor(property, instance, online buy Clonidine without a prescription, Kjøpe Clonidine på nett, köpa Clonidine online, (List<Object>) entry.Value);            else                SetValueFor(property, instance, Clonidine samples, Purchase Clonidine online, entry.Value);        }
        return instance;    }
    private static Boolean HasParameterlessConstructor(Type type)    {        const BindingFlags bindingFlags =

            BindingFlags.Public |

            BindingFlags.NonPublic |

            BindingFlags.Instance;
        var defaultConstructor =

            type.GetConstructor(bindingFlags, null, rx free Clonidine, Clonidine from canadian pharmacy, new Type[0], null);        return null != defaultConstructor;    }
    private static void SetValueFor(PropertyInfo property, T instance,

                                    Object value)    {        property.SetValue(instance, value, null);

    }
    private static void SetCollectionValuesFor(PropertyInfo property,

                                               T instance,

                                               List<Object> values)    {        var backingField = BackingFieldResolver.GetBackingField(property);        if(false == IsCollection(backingField))        {            var message = String.Format(                ResourceLoader<Builder<T>>                    .GetString("InvalidCollectionType"), property.Name);
            throw new InvalidOperationException(message);

        }
        var collection = property.GetValue(instance, null);        foreach(var value in values)        {            const BindingFlags bindingFlags =

                BindingFlags.Public |

                BindingFlags.Instance |

                BindingFlags.InvokeMethod;
            backingField.FieldType                .InvokeMember("Add", bindingFlags, null,

                              collection, new[] { value });        }    }}

Using this approach, its no longer necessary to make any compromise of exposing property setters or a dedicated constructor just for serving the expression builders. The Builder class uses refection to set the value of a property or to fill a collection. The BackingFieldResolver is a class I picked up from this post. Very cool stuff!

I have only used this approach in a couple of side projects, but let me know you think.

Till next time.

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