import java.util.List;

import java.util.ArrayList;

public class ConfigValidator {

/**

* Validates a list configuration against predefined rules.

*

* @param config The list configuration to validate.

* @param expectedSize The expected size of the list.

* @param allowedValues A list of allowed values for elements in the list.

* @return True if the configuration is valid, false otherwise.

*/

public static boolean validateListConfig(List<?> config, int expectedSize, List<?> allowedValues) {

if (config == null) {

System.err.println("Error: Config list cannot be null.");

return false;

}

if (config.size() != expectedSize) {

System.err.println("Error: Config list size is incorrect. Expected: " + expectedSize + ", Actual: " + config.size());

return false;

}

for (Object item : config) {

if (!allowedValues.contains(item)) {

System.err.println("Error: Invalid value in config list: " + item);

return false;

}

}

return true;

}

public static void main(String[] args) {

//Example Usage

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

validConfig.add("value1");

validConfig.add("value2");

validConfig.add("value3");

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

invalidConfigSize.add("value1");

invalidConfigSize.add("value2");

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

invalidConfigValue.add("value1");

invalidConfigValue.add("invalidValue");

invalidConfigValue.add("value3");

List<String> allowedValues = List.of("value1", "value2", "value3");

System.out.println("Valid Config: " + validateListConfig(validConfig, 3, allowedValues));

System.out.println("Invalid Config Size: " + validateListConfig(invalidConfigSize, 3, allowedValues));

System.out.println("Invalid Config Value: " + validateListConfig(invalidConfigValue, 3, allowedValues));

}

}