Implemented ConfigService load/save methods and tests

client/src/main/java/client/utils/Config.java

@@ -0,0 +1,51 @@
+package client.utils;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Config {
+
+    /*
+    Sets parameters for what the config file needs with a config
+     Object that will be used in the ConfigService object
+     */
+    private String language = "en";
+    private String serverUrl = "http://localhost:8080";
+
+    private List<String> favourites = new ArrayList<>();
+    private List<String> shoppingList = new ArrayList<>();
+
+    public Config(){}
+
+    public String getLanguage() {
+        return language;
+    }
+
+    public List<String> getShoppingList() {
+        return shoppingList;
+    }
+
+    public List<String> getFavourites() {
+        return favourites;
+    }
+
+    public String getServerUrl() {
+        return serverUrl;
+    }
+
+    public void setLanguage(String language) {
+        this.language = language;
+    }
+
+    public void setServerUrl(String serverUrl) {
+        this.serverUrl = serverUrl;
+    }
+
+    public void setFavourites(List<String> favourites) {
+        this.favourites = favourites;
+    }
+
+    public void setShoppingList(List<String> shoppingList) {
+        this.shoppingList = shoppingList;
+    }
+}

client/src/main/java/client/utils/ConfigService.java

@@ -0,0 +1,84 @@
+package client.utils;
+
+
+import com.fasterxml.jackson.core.exc.StreamReadException;
+import com.fasterxml.jackson.databind.DatabindException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import java.nio.file.Path;
+import java.io.File;
+import java.io.IOException;
+
+public class ConfigService {
+    private final Path configPath;
+    private final ObjectMapper mapper = new ObjectMapper();
+    private Config config;
+
+
+    /*
+    Constructor that takes the path to the config file as it's parameter
+
+     */
+    public ConfigService(Path configPath){
+        this.configPath = configPath;
+        load();
+    }
+
+    /*
+    Load needs to be called to load any changes from the config file
+    to the config attribute of the configService class.
+    Takes no parameters
+     */
+    private void load(){
+        File file = configPath.toFile(); //reads the config file as file
+        if(file.exists()){
+            try{
+                config = mapper.readValue(file, Config.class); //uses Jackson to map the file to the config attribute
+
+            } catch (StreamReadException e) {
+                throw new RuntimeException(e);
+            } catch (DatabindException e) {
+                throw new RuntimeException(e);
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        else{
+            config = new Config(); // if file doesn't exist, it creates one
+        }
+    }
+
+    public Path getConfigPath() {
+        return configPath;
+    }
+
+    public ObjectMapper getMapper() {
+        return mapper;
+    }
+
+    public Config getConfig() {
+        return config;
+    }
+
+    public void setConfig(Config config) {
+        this.config = config;
+    }
+
+
+    /*
+    The save method saves any changes done to the file
+    from the config object
+     */
+    public void save(){
+
+        try {
+            File file = configPath.toFile(); // file is the config file here
+            mapper.writeValue(file, config); // here we edit the value of the file using config
+
+        }
+        catch (Exception e){
+            throw new RuntimeException(e);
+        }
+    }
+
+}