The technical principles of the "AutoValue Processor" framework and analysis of source code analysis

The "AutoValue Processor" framework is a Java annotation processor for generating unsusted data models.It is a tool developed by Google to simplify the creation process of the Java class, especially to create a data model with unable variable attributes. AutoValue is a open source project of Google, which allows developers to generate simple Java data classes through simple annotations.AutoValue Processor is part of it, which can process these annotations and automatically generate the corresponding Java code. It is very simple to use AutoValue Processor. You only need to add some annotations to the data model class, and the annotation processor will automatically generate code related to these annotations.The most commonly used annotation is @Autovalue, which is used to modify the unable variable data model class. The following is a sample code that uses an AutoValue Processor to generate an unable variable data model: import com.google.auto.value.AutoValue; @AutoValue public abstract class Person { public abstract String getName(); public abstract int getAge(); public static Person create(String name, int age) { return new AutoValue_Person(name, age); } } The above code defines an unable variable data model called Person, which contains two attributes: name and Age.By adding @Autovalue annotations to the class, AutoValue Processor will automatically generate the required code, including the attribute access method, Equals (), and HashCode () methods.At the same time, it also automatically generates a static factory method Create () to create a Person object. AUTOVALUE PROCESSOR based on the Java annotation processor framework and generate code by parsing and processing annotations.It can scan the Java code during the compilation and generate a new source code according to the annotation.This method enables developers to create unable variable data model classes to avoid manually writing repeated and easy -to -error code. In summary, AutoValue Processor is a powerful annotation processor that is used to generate the Java class that generates unable variable data models.Through simple annotations, it can automatically generate code access methods, Equals (), and HashCode () methods, which greatly simplify the creation process of the Java class. The source code of AutoValue Processor can be found on Github, and you can learn more about its implementation principles and internal mechanisms by learning the source code.