import java.util.*;

import java.util.concurrent.atomic.AtomicBoolean;

public class ConfigurationValidator {

private static final AtomicBoolean validationSuccess = new AtomicBoolean(true);

public static boolean validateConfiguration(Map<String, String> configuration) {

if (configuration == null) {

System.err.println("Error: Configuration is null.");

validationSuccess.set(false);

return false;

}

Set<String> seenValues = new HashSet<>();

List<String> duplicateKeys = new ArrayList<>();

for (Map.Entry<String, String> entry : configuration.entrySet()) {

String key = entry.getKey();

String value = entry.getValue();

if (value != null) { //Handle null values

if (!seenValues.add(value)) {

duplicateKeys.add(key);

}

}

}

if (!duplicateKeys.isEmpty()) {

System.err.println("Error: Duplicate configuration values found for keys: " + duplicateKeys);

validationSuccess.set(false);

return false;

}

System.out.println("Configuration validated successfully.");

return true;

}

public static boolean isValidationSuccessful() {

return validationSuccess.get();

}

public static void main(String[] args) {

// Example Usage

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

config1.put("setting1", "value1");

config1.put("setting2", "value2");

config1.put("setting3", "value1"); // Duplicate

config1.put("setting4", null); //Test null value

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

config2.put("setting1", "value1");

config2.put("setting2", "value2");

config2.put("setting3", "value3");

System.out.println("Validating config1...");

validateConfiguration(config1);

System.out.println("Validation successful: " + isValidationSuccessful());

System.out.println("Validating config2...");

validateConfiguration(config2);

System.out.println("Validation successful: " + isValidationSuccessful());

System.out.println("Validating null config...");

validateConfiguration(null);

System.out.println("Validation successful: " + isValidationSuccessful());

}

}