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	Object Graph Navigation (.NET)

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Added by Laurent Cobos, last edited by Laurent Cobos on Jun 27, 2007

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Object Graph Navigation

Supports object graph navigation to help us access properties inside the domain's objects without having to build fixtures.

We must priviligied an existing method in the fixture. If no method found in the fixture, start searching a matching method under the graph representation of underlying domain objects.

Example

 
public class SomeFixtureUsingEmploye
{
   public Employe employe = new Employe(new Name("Charles", "Smith"));

   // case 1
   public string EmployeeNameFirst()
   {
       get { return employee.Name.First; }
   }

   // case 2
   public Name EmployeeName 
   {
       get { return employee.Name; }
   }
}

public class Employe
{
   public Name name;

   public Employe (Name name) 
   { 
       this.name = name;
   }

   public Name Name
   {
       get { return name; }
       set { name = value; }
   }

   // case 3
   public string NameFirst
   {
       get { return name.First; }
   }
}

public class Name
{
   private string first;
   private string last;

   public Name (string first, string last) 
   { 
       this.first = first;
       this.last = last;
   }

   // case 4
   public string First 
   {
       get { return first; } 
       set { first = value; }
   }

   public string Last
   {
       get { return last; }
       set { last = value; }
   }
}

Unable to render embedded object: File (ObjectGraphNavigation-EmployeeNameFirst.png) not found.

list of	object graph navigation resolution	for header	Employee Name First
target	method name
nothing	EmployeeNameFirst
EmployeeName	First
Employee	NameFirst
Employee.Name	First

Another case with more depth :

list of	object graph navigation resolution	for header	a b c d
target	method name
nothing	abcd
abc	d
ab	cd
ab.c	d
a	bcd
a.bc	d
a.b	cd
a.b.c	d

Example

This example shows the call of all methods involve in resolving the object graph name.
(Class # method)

rule for	object graph navigation example fixture
object graph	method name ?
employee name first	Fixture#EmployeeNameFirst
thejob title short description	Fixture#TheJob, Job#TitleShortDescription
thejob title long description	Fixture#TheJob, Job#Title, Title#LongDescription
thejob status id	Fixture#TheJob, Job#Status, Status#Id

Initial request

Support of OGNL expression inside GreenPepper examples.

Fixtureless

Supports OGNL to help us access properties inside the domain's objects without having to build fixtures.

Example

Given the following class:

 
public class Employe
{
   public string firstName;
   private string lastName;

   public Employe (string firstName, string lastName) 
   { 
       this.firstName = firstName;
       this.lastName = lastName;
   }

   public string LastName
   {
       get { return lastName; }
       set { lastName = value; }
   }

   public String FullName() { return firstName + ", " + lastName;}
}


public class SomeFixtureUsingEmploye
{
   public Employe employe = new Employe("Charles", "Smith");
}

I want to be able to access the employe fullName without having to write a method
public string EmployeFullName() {return employe.FullName();} in my fixture.