The technical principles of the Chicory CLI framework in the Java library

The technical principles of the Chicory CLI framework in the Java library Chicory CLI is an open source Java class library that provides a simple and powerful way to build a command line interface (CLI) application.It uses some key technical principles that allow developers to easily create CLI applications with rich functions. The technical principles of Chicory CLI mainly involve the following aspects: 1. Annotation Processing: Chicory Cli uses an annotation processor to scan and analyze the specific annotations added by developers in the Java code.These annotations are used to define all parts of the command line program, such as commands, options, and parameters.The annotation processor generates the Java code corresponding to the corresponding Java code, thereby simplifying the development process of the CLI application. 2. Reflection: Chicory Cli uses the Java's reflection mechanism to dynamically obtain and operate methods and members during runtime.By reflecting, the Chicory Cli can reflect the corresponding method in the application according to the defined commands, options, and parameters, and pass the corresponding parameters. 3. Command Parsing (Command Parsing): Chicory CLI uses understanding the analyzer to analyze the command line input, and extract information about commands, options and parameters from it.The parser converts the command line input into internal data structure according to the command structure and annotation defined in the application, so that subsequent processing and execution. 4. Configuration Management: Chicory CLI supports developers define and manage configuration in applications.Through configuration management, developers can flexibly set the default configuration value, commands, options and parameters of the command line program.These configurations can be defined in the code by annotating marking, and dynamically loaded and analyzed during runtime. The following is an example code that demonstrates how to build a simple command line application with the Chicory CLI framework: import io.chicoralph.lc.*; @ConsoleProgram(name = "MyCLIApp", version = "1.0.0") public class MyCLIApp { @Command(name = "greet", description = "Greet someone") public void greet(@Option(name = "name", description = "Name of the person") String name) { System.out.println("Hello, " + name + "!"); } public static void main(String[] args) { CommandLineProgram.run(MyCLIApp.class, args); } } In the above code, we first use the name and version of the entire command line application to use the annotation of `@consoleProgram` to define the entire command line application.Then use the `@command` annotation to define an command called" GREET ", which accepts an option called" Name "for the name of the welcome person.In the `Greet` method, we directly print the welcome news to the console. Finally, in the `main` method, we use the method of the Chicory CLI framework to use the method of` CommandLineProgram.run () `and specify the entry class of the application as` mycliapp`. Through the above code example, we can see that the Chicory CLI framework provides a simple and elegant way to build a command line application.By using the technical principles such as annotations, reflection, and analysis, it greatly simplifies the workload of developers and provides rich configuration and expansion options, making it easier and flexible to build a CLI application.