import java.util.HashMap;

import java.util.Map;

public class ConfigValidator {

/**

* Validates user-provided configuration parameters.

*

* @param config A map containing the configuration parameters.

* Keys are parameter names (strings), values are parameter values.

* @return A map containing validation errors. If no errors, returns an empty map.

*/

public static Map<String, String> validateConfig(Map<String, String> config) {

Map<String, String> errors = new HashMap<>();

// Example validation rules (customize as needed)

if (config == null) {

errors.put("overall", "Configuration cannot be null.");

return errors;

}

if (config.get("appName") == null || config.get("appName").trim().isEmpty()) {

errors.put("appName", "Application name cannot be empty.");

}

if (config.get("port") == null || !config.get("port").matches("\\d+")) {

errors.put("port", "Port must be a number.");

}

if (config.get("debug") != null && !config.get("debug").equals("true") && !config.get("debug").equals("false")) {

errors.put("debug", "Debug value must be 'true' or 'false'.");

}

if (config.get("databaseUrl") == null || config.get("databaseUrl").trim().isEmpty()) {

errors.put("databaseUrl", "Database URL cannot be empty.");

}

return errors;

}

public static void main(String[] args){

//Example usage

Map<String, String> config1 = new HashMap<>();

config1.put("appName", "MyApplication");

config1.put("port", "8080");

config1.put("debug", "true");

config1.put("databaseUrl", "jdbc:mysql://localhost:3306/mydb");

Map<String, String> errors1 = validateConfig(config1);

System.out.println("Validation errors: " + errors1);

Map<String, String> config2 = new HashMap<>();

config2.put("appName", "");

config2.put("port", "abc");

config2.put("debug", "maybe");

Map<String, String> errors2 = validateConfig(config2);

System.out.println("Validation errors: " + errors2);

}

}