// "Visitor"
// "ConcreteVisitor1"
public void TestVisitorPattern()
{
// Setup structure
Element aE = new ConcreteElementA();
Element bE = new ConcreteElementB();
var o = new ObjectStructure();
o.Attach(aE);
o.Attach(bE);
// Create visitor objects
var v1 = new ConcreteVisitor1();
var v2 = new ConcreteVisitor2();
// Structure accepting visitors
o.Accept(v1);
o.Accept(v2);
o.Detach(aE);
o.Detach(bE);
// Wait for user
Console.Read();
}
public override void VisitConcreteElementA(
ConcreteElementA concreteElementA)
{
Console.WriteLine("{0} visited by {1}",
concreteElementA.GetType().Name, GetType().Name);
concreteElementA.OperationA();
}
public override void VisitConcreteElementA(ConcreteElementA element)
{
Console.WriteLine("{0}: {1} visiting by {2} ...",
element.GetType().Name,
element.Name,
this.GetType().Name);
element.OperationA();
}
public static void Run()
{
var elementA = new ConcreteElementA();
var elementB = new ConcreteElementB();
var visitor = new ConcreteVisitor();
elementA.Accept(visitor);
elementB.Accept(visitor);
}
private Element BuildComposition()
{
ConcreteElementA a1 = new ConcreteElementA();
ConcreteElementA a2 = new ConcreteElementA();
ConcreteElementB b1 = new ConcreteElementB();
ConcreteElementC c1 = new ConcreteElementC();
ConcreteElementC c2 = new ConcreteElementC();
c1.AddElement(a1).AddElement(c2);
c2.AddElement(a2).AddElement(b1);
return(c1);
}
public void VisitorPatternCodeTest()
{
ConcreteElementA elementA = new ConcreteElementA();
ConcreteElementB elementB = new ConcreteElementB();
ObjectStruture struture = new ObjectStruture();
struture.Add(elementA);
struture.Add(elementB);
ConcreteVisitor1 v1 = new ConcreteVisitor1();
struture.Aceppt(v1);
}
public void Test()
{
Visitor visitorA = new ConcreteVisitorA();
Visitor visitorB = new ConcreteVisitorB();
Element elementA = new ConcreteElementA();
Element elementB = new ConcreteElementB();
Assert.That(elementA.Accept(visitorA), Is.EqualTo("ConcreteElementA visited by ConcreteVisitorA"));
Assert.That(elementA.Accept(visitorB), Is.EqualTo("ConcreteElementA visited by ConcreteVisitorB"));
Assert.That(elementB.Accept(visitorA), Is.EqualTo("ConcreteElementB visited by ConcreteVisitorA"));
Assert.That(elementB.Accept(visitorB), Is.EqualTo("ConcreteElementB visited by ConcreteVisitorB"));
}
public static void TestVisitors()
{
var o = new ObjectStructure();
var celA = new ConcreteElementA();
var celB = new ConcreteElementB();
Assert.AreSame(o.Attach(celA, true), celA);
Assert.AreSame(o.Attach(celB, true), celB);
var v1 = new ConcreteVisitor1();
var v2 = new ConcreteVisitor2();
var test1 = o.Accept(v1, true);
StringAssert.AreEqualIgnoringCase(test1, "ConcreteElementA visited by ConcreteVisitor1\r\nConcreteElementB visited by ConcreteVisitor1\r\n");
var test2 = o.Accept(v2, true);
StringAssert.AreEqualIgnoringCase(test2, "ConcreteElementA visited by ConcreteVisitor2\r\nConcreteElementB visited by ConcreteVisitor2\r\n");
}
public abstract void VisitConcreteElementA(
ConcreteElementA concreteElementA);
public abstract void VisitConcreteElementA(ConcreteElementA concreteElementA);
public override void VisitConcreteElementA(ConcreteElementA concreteElementA)
{
Console.WriteLine("{0} is visited by {1}", concreteElementA, this);
}
public override void VisitConcreteElementA(ConcreteElementA concreteElementA)
{
Debug.Log(concreteElementA.GetType().Name + " visited by " + this.GetType().Name);
}
public override void VisitConcreteElementA(ConcreteElementA concreteElementA)
{
Console.WriteLine($@"{concreteElementA.GetType().Name}被{this.GetType().Name}访问");
}
public abstract string Visit(ConcreteElementA element);
public void Visit(ConcreteElementA element)
{
Console.WriteLine("Visiting " + element.Name + " ...");
}
public override void VisitA(ConcreteElementA concreteElementA)
{
concreteElementA.OperationA();
}
public override string Visit(ConcreteElementA element)
{
return($"{element.GetType().Name} visited by {GetType().Name}");
}
public override void VisitConcreteElementA(ConcreteElementA concreteElementA)
{
Console.WriteLine("{0} visit {1}", this.GetType().Name, concreteElementA.GetType().Name);
}
public override void VisitConcreteElementA(ConcreteElementA element)
{
Console.WriteLine($"{element.GetType().Name} 被 {GetType().Name} 访问");
}
public void VisitConcreteElementA(ConcreteElementA concreteElementA)
{
Console.WriteLine("visitConcreteElementA by ConcreteVisitorA");
}
public void VisitorElementA(ConcreteElementA element)
{
// Concrete visitor 1 on element a
}
public void Visit(ConcreteElementA elementA)
{
elementA.FeatureA();
}
public override string Visit(ConcreteElementA element)
{
return $"{element.GetType().Name} visited by {GetType().Name}";
}
public abstract string Visit(ConcreteElementA element);
