Component based learning (3) path and group annotations in arouter

It's not right here ARouter A comprehensive analysis of , But the Group and Path Abstract your thoughts to understand

1. introduce Group and Path

I also mentioned in the last article ,Group It's the group ,Path Is the specific class in the group . stay ARouter Of api Module , Targeted Group and Path The interface of ARouterGroup and ARouterPath. as follows （ Here's just an example , There is not necessarily an interface with the same name , But the mind is the same ）

public interface ARouterGroup {
    
    Map<String, Class<? extends ARouterPath>> getGroupMap();
}

• ARouterGroup Interface ：
  There is one Map aggregate ,key, Is the name of each group , such as app,common wait .value Is the detail class corresponding to each group name . In fact, it is realized ARouterPath The class of the interface .
• ARouterPath Interface :

public interface ARouterPath {
    
    Map<String, RouterBean> getPathMap();
}

there key Namely Path,value Even with Path Corresponding , By RouterBean Encapsulated class object . such as key yes /app/MainActivity,value Namely RouterBean<MainActivity.class>

RouterBean That's it , Which is framed Class object . It can be understood that pairs Class Encapsulation of objects

2.Path and Group How it works

Be careful ： To have a first Path The interface of ARouterPath, There's more Group The interface of ARouterGroup, because Group To traverse, use Path

Speaking of this , Maybe it's still right ARouterGroup Interface ,ARouterPath Not familiar with the interface . I'm here to bring the concrete effect , It's easy to understand

When implementing , It is using JavaPoet When generating class files
① First generate , Realized ARouterPath The class of the interface . Different group There are different implementation classes . such as app The group corresponds to one ARouterPath Implementation class of , There's one in there, too Map aggregate ,key It can be app All in the group Path,value Even with Path Corresponding RouterBean.
② Then generate and implement ARouterGroup The class of the interface . This class is also a group corresponding to one , It is equivalent to a module corresponding to a routing table .key Just different groups ,value That's what different groups correspond to ARouterPath Implementation class of .

If there are only two business modules at present , namely order and personal, be
① Implementation of generation ARouterPath The specific code implementation of the interface class is shown in the figure

order Module generated , Inside Map The collection is stored order All modules path

personal Module generated

② Implementation of generation ARouterGroup The specific code implementation of the interface class is shown in the figure

order Plate generated , It stores the corresponding implementation of all possible modules ARouterPath Of Class object personal Plate generated

ARouterManager Is a global , It's used to cache ARouter$$Group and ARouter$$Path Of

When communication is needed , such as order Module to personal Module communication , I think we need to find the overall situation ARouterManager Is there a cache in it ARouter$$Group$$personal, If there is , Just use the cache directly ARouter$$Group$$personal, find ARouter$$Path$$personal.class, And then get the target class RouterBean object , That is, we get the of the target class class object , communicate , without , Just compile the generated ARouter$$Group$$personal Classes and ARouter$$Path$$personal Add to ARouterManager Inside （ namely Lazy loading ）, Then complete the jump
The code description is like this ：
ARouter$$Group$$personal.getGroupMap().get("personal").get("targetClass")

ARouter Parameter transfer of , It's a similar idea , and ButterKnife It's very similar . Is to annotate the parameter definition to be passed , Then, when compiling, generate the class file of a specific class , The purpose of this class file is to use Bundle, Assign values to these parameters of the corresponding class

What I understand Path and Group That's how it works . The specific method of generating these class files JavaPoet Code , I haven't studied in detail yet , Learn when you need it later , Now master your thoughts .