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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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