Code cleanup

Author: Crim

src/main/java/org/sourcelab/kafka/connect/apiclient/Configuration.java

@@ -22,7 +22,7 @@
  *
  * Also allows for configuring an optional proxy with or without authentication.
  */
-public class Configuration {
+public final class Configuration {
     // Defines the URL/Hostname of Kafka-Connect
     private final String apiHost;
 

src/main/java/org/sourcelab/kafka/connect/apiclient/request/dto/ConnectorPluginConfigValidation.java

@@ -20,7 +20,7 @@
 /**
  * Represents the response from the API.
  */
-public class RestResponse {
+public final class RestResponse {
     private final String responseStr;
     private final int httpCode;
 

src/main/java/org/sourcelab/kafka/connect/apiclient/rest/RestResponse.java

@@ -30,7 +30,7 @@
 /**
  * Handles parsing a response to RestResponse object.
  */
-public class RestResponseHandler implements ResponseHandler<RestResponse> {
+public final class RestResponseHandler implements ResponseHandler<RestResponse> {
     private static final Logger logger = LoggerFactory.getLogger(RestResponseHandler.class);
 
     @Override
@@ -46,7 +46,7 @@ public RestResponse handleResponse(final HttpResponse response) {
 
             // Construct return object
             return new RestResponse(responseStr, statusCode);
-        } catch (IOException exception) {
+        } catch (final IOException exception) {
             logger.error("Failed to read entity: {}", exception.getMessage(), exception);
             // TODO throw exception
             return null;

src/main/java/org/sourcelab/kafka/connect/apiclient/rest/handlers/RestResponseHandler.java

@@ -27,7 +27,7 @@
 /**
  * Returns response as a string.
  */
-public class StringResponseHandler implements ResponseHandler<String> {
+public final class StringResponseHandler implements ResponseHandler<String> {
     @Override
     public String handleResponse(final HttpResponse response) throws IOException {