组合模式（Composite）—分公司与总部

组合模式（Composite）

如图是一个OA系统，总公司和分公司想共用同一套机制。

abstract class Company
{
protected string name;
public Company (string name)
{
this.name = name;
}
public abstract void Add(Company c);
public abstract void Remove(Company c);
public abstract void Display(int depth);
public abstract void LineOfDuty(); //履行职责

}

class ConcreteCompany:Company
{
private List<Company> children = new List<Company>();
public ConcreteCompany(string name) : base(name) { }
public override void Add(Company c)
{
children.Add(c);
}
public override void Remove(Company c)
{
children.Remove(c);
}
public override void Display(int depth)
{
Console.WriteLine(new string ('-',depth)+name );
foreach (Company  component in children )
{
component.Display(depth + 2);
}
}
//履行职责
public override void LineOfDuty()
{
foreach(Company component in children )
{
component.LineOfDuty();
}
}
}

//人力资源部与财务部
class HRDepartment:Company
{
public HRDepartment(string name) : base(name) { }
public override void Add(Company c)
{
}
public override void Remove(Company c)
{

}
public override void Display(int depth)
{
Console.WriteLine(new string ('-',depth )+name );
}
public override void LineOfDuty()
{
Console.WriteLine("{0}员工招聘培训管理",name );
}
}
//财务部
class FinanceDepartment:Company
{
public FinanceDepartment(string name) : base(name)   { }
public override void Add(Company c)
{
}
public override void Remove(Company c)
{

}
public override void Display(int depth)
{
Console.WriteLine(new string ('-',depth )+name );
}
public override void LineOfDuty()
{
Console.WriteLine("{0}公司财务收支管理",name );
}
}

ConcreteCompany root = new ConcreteCompany("北京总公司");
root.Add(new HRDepartment("总公司人力资源部"));
root.Add(new FinanceDepartment("总公司财务部"));

ConcreteCompany comp = new ConcreteCompany("上海分公司");
comp.Add(new HRDepartment("上海分人力资源"));
comp.Add(new FinanceDepartment("上海分财务"));
root.Add(comp);

Console.WriteLine("\n结构图:");
root.Display(1);

Console.WriteLine("\n职责：");
root.LineOfDuty();
Console.Read();