Objectos :: auto :: Annotations framework in the Java library in the Java library (Analyzing The Technical Principles of Objectos :: auto :: Annitation in Java Class Librari ES)
Objectos :: auto :: Annotations framework in the Java library analysis
In the Java library, Annotations provides a mechanism for adding metadata.Objectos :: auto :: Annotations framework is a framework for automatically generating an annotation processor. It can simplify the process of developers to write the code for processing annotations.This article will explore the technical principles of ObjectOS :: Auto :: Annotations framework, and provide some Java code examples.
1. Annotation processors
Annotation processor is a tool for processing annotations.They analyze the Java source code, find out the annotations, and generate additional code according to the content of the annotation.Objectos :: auto :: Annotations framework comes from the process of dynamicization by introducing the concept of the annotation processor.
2. ObjectOS :: Auto :: Annotations framework main principle
Objectos :: auto :: Annotations framework to automatically generate the function of the annotation processor through the following steps:
a. Define annotations: First of all, we need to define our own annotations.These annotations will be used to identify the class or methods that need to generate a processor.
b. Write the template code of the processor: The framework provides a template code that contains the skeleton code of the processor class.We can modify the template as needed to generate code that meets the needs.
c. Make an annotation processor generating: Using the command line tool provided by ObjectOS :: Auto :: Annotations framework, we can generate the annotation processor class according to the template code.The tool will automatically generate the code of the processor according to the use of the naming and annotations.
d. Registration annotation processor: register the annotation processor in our project.In this way, when the Java compiler encounters the code that uses our custom annotation when compiling, the automatic processor will be called.
e. Generate additional Java code: The annotation processor will read the source code of our customized annotation, and generate additional Java code based on the content of the annotation.These generations can include the getter and setter method, constructing functions, equals, and hashcode methods to simplify our development process.
3. ObjectOS :: Auto :: Annotations framework for example code
Below is a simple example code that demonstrates the process of using ObjectOS :: Auto :: Annitations framework to generate the getter and setter method:
import com.objectos.annotations.AutoGetterSetter;
@AutoGetterSetter
public class Person {
private String name;
private int age;
// Continue to write other code ...
}
In this example,@Autogettersetter is a comment that we customize.When we compile this code, ObjectOS :: Auto :: Annitations framework will automatically generate the implementation code of the Getter and Setter method for the Person class, similar to the following code fragment:
public class Person {
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
// Continue to write other code ...
}
In this way, we can generate some repeated code by using annotations to improve development efficiency.
Summarize:
ObjectOS :: Auto :: Annotations framework is a framework for automatic generating an annotation processor. It automatically analyzes the Java source code by introducing the concept of the annotation processor and generates additional Java code based on the content of the annotation.This article introduces the technical principles of ObjectOS :: Auto :: Annotations framework, and provides a simple example of generating the Getter and Setter method using this framework.By using this framework, we can simplify the development process and improve the readability and maintenance of code.
