The verification framework design principles in the Java class library
The verification framework design principles in the Java class library
When developing the Java class library, in order to improve the reliability and maintainability of the code, it is essential to effectively input verification.Verification framework is a common solution that ensures that the input data meets the expected rules.This article will introduce the principles of verification framework design in the Java class library and provide some Java code examples.
1. Single Responsibility Principle
When designing the verification framework, the principle of a single responsibility should be followed, that is, each class or method should only pay attention to the verification rules.In this way, the verification logic can be decoupled from business logic to improve the readability and maintenance of code.For example, you can create an independent class to verify the format of the email address, and another class to verify the password strength.
Example code:
public class EmailValidator {
public static boolean isValid(String email) {
// Realize the logic of authentication of email address format
}
}
public class PasswordValidator {
public static boolean isValid(String password) {
// Implement the logic of password strength verification
}
}
2. Open-CLOSED Principle
The verification framework should be expanded and closed and closed.This means that when new verification rules need to be added, it should be implemented by extending instead of modifying existing code.This can be achieved by using abstraction and interfaces.By defining a general -purpose verification interface, new verification rules can be easily added.
Example code:
public interface Validator {
boolean isValid(String input);
}
public class EmailValidator implements Validator {
@Override
public boolean isValid(String email) {
// Realize the logic of authentication of email address format
}
}
public class PasswordValidator implements Validator {
@Override
public boolean isValid(String password) {
// Implement the logic of password strength verification
}
}
3. Liskov replacement principles
The verification framework should meet the principle of Liskov replacement, that is, subclasses should be able to replace the parent class where the parent class uses its father class.This means that each verification rule should be interchangeable and can be used in any place that needs to be verified.This ensures the versatility and flexibility of the verification framework.
Example code:
public interface Validator {
boolean isValid(String input);
String getErrorMessage();
}
public class EmailValidator implements Validator {
@Override
public boolean isValid(String email) {
// Realize the logic of authentication of email address format
}
@Override
public String getErrorMessage() {
return "Invalid email address.";
}
}
public class PasswordValidator implements Validator {
@Override
public boolean isValid(String password) {
// Implement the logic of password strength verification
}
@Override
public String getErrorMessage() {
return "Weak password.";
}
}
4. Law of Demeter
The verification framework should follow the Dimet Law, that is, one object should understand the internal structure of other objects as little as possible.The verification framework should provide a simple and clear interface, so that users can easily use it without having to understand the internal implementation details of the framework.
Example code:
public class ValidationFramework {
private List<Validator> validators;
public ValidationFramework() {
validators = new ArrayList<>();
}
public void addValidator(Validator validator) {
validators.add(validator);
}
public boolean validate(String input) {
for (Validator validator : validators) {
if (!validator.isValid(input)) {
System.out.println(validator.getErrorMessage());
return false;
}
}
return true;
}
}
In this article, we introduced the principles of verification framework design in the Java library.By following these principles, highly scalable, maintenance, and easy -to -use verification frameworks can be designed.Through reasonable organizational logic of verification rules, the quality and readability of the code can be improved, thereby helping developers to build a better Java library.
