java - 将包/类名称列表转换为父/子数据结构

Question

我有一个类名列表如下:

   String s1 = "com.mycompany.project.dao.hibernate.BaseDAOHibernate";
    String s2 = "com.mycompany.project.domain.Product";
    String s3 = "com.mycompany.project.domain.ProductCategory";
    String s4 = "com.mycompany.project.service.impl.ProductServiceImpl";
    String s5 = "com.mycompany.project.domain.User";
    String s6 = "com.mycompany.project.service.impl.ProductCategoryServiceImpl";
    String s7 = "com.mycompany.project.dao.hibernate.ProductCategoryDAOHibernate";
    String s8 = "com.mycompany.project.dao.hibernate.ProductDAOHibernate";

    String[] strings = { s1, s2, s3, s4, s5, s6, s7, s8};

我想使用以下类定义将此数组转换为树结构:

public class Item  {
    private String itemName;
    private List<Item> subItems;

}

该方法将获取上面的数组并生成以下对象。

item.ItemName = "com";
item.suItems = {"mycompany"};

item2.itemName = "mycompany";
item2.subItems = {"project");

item3.itemName = {"project"};
item3.subItems = {"dao", "domain", "service"}

...等等。

请告知如何执行此操作，因为我可能有数百个类的列表作为输入。

谢谢

Answer 1

请参阅我在 C# 上的实现，对于 Java，您可以将其用作伪代码。

public class Item
{
    private String itemName;
    private List<Item> subItems = new List<Item>();

    public void Push(string[] namespaces, int index)
    {
        if (index >= namespaces.Length)
            return;

        foreach (Item child in subItems)
        {
            if (child.itemName == namespaces[index])
            {
                child.Push(namespaces, index + 1);
                return;
            }
        }

        Item newChild = new Item();
        newChild.itemName = namespaces[index];
        newChild.Push(namespaces, index + 1);
        subItems.Add(newChild);
    }
}

private static void Namespaces()
{
    String s1 = "com.mycompany.project.dao.hibernate.BaseDAOHibernate";
    String s2 = "com.mycompany.project.domain.Product";
    String s3 = "com.mycompany.project.domain.ProductCategory";
    String s4 = "com.mycompany.project.service.impl.ProductServiceImpl";
    String s5 = "com.mycompany.project.domain.User";
    String s6 = "com.mycompany.project.service.impl.ProductCategoryServiceImpl";
    String s7 = "com.mycompany.project.dao.hibernate.ProductCategoryDAOHibernate";
    String s8 = "com.mycompany.project.dao.hibernate.ProductDAOHibernate";

    String[] strings = { s1, s2, s3, s4, s5, s6, s7, s8 };

    Item root = new Item();
    foreach (string s in strings)
    {
        root.Push(s.Split('.'), 0);
    }
    // Do something with root variable.
}

我还建议使用 HashMap 而不是列表。