[FEATURE] Added local preference manager to store settings in a local json file

src/main/java/org/parabot/environment/api/utils/FileUtil.java

@@ -1,10 +1,8 @@
 package org.parabot.environment.api.utils;
 
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.io.IOException;
+import java.io.*;
 import java.nio.channels.FileChannel;
+import java.nio.file.Files;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 
@@ -88,4 +86,15 @@ public class FileUtil {
         }
         destination.close();
     }
+
+    public static String getFileContents(File file) throws IOException {
+        return new String(Files.readAllBytes(file.toPath()));
+    }
+
+    public static void writeFileContents(File file, String contents) throws IOException {
+        BufferedWriter writer = new BufferedWriter(new FileWriter(file.getAbsolutePath()));
+        writer.write(contents);
+
+        writer.close();
+    }
 }

src/main/java/org/parabot/environment/api/utils/PBLocalPreferences.java

@@ -0,0 +1,113 @@
+package org.parabot.environment.api.utils;
+
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+import org.parabot.core.Directories;
+
+import java.io.File;
+import java.util.HashMap;
+
+/**
+ * Manages preferences in a local json file in the Parabot settings folder
+ *
+ * @author AlexanderBielen
+ */
+public class PBLocalPreferences {
+    private static JSONParser parser = new JSONParser();
+    private File settingsFile;
+
+
+    public PBLocalPreferences(String fileName) {
+        settingsFile = new File(Directories.getSettingsPath() + "/" + secureFileName(fileName));
+    }
+
+    /**
+     * Gets all settings inside the file
+     *
+     * @return JSONObject or null if anything went wrong
+     */
+    public JSONObject getSettings() {
+        try {
+            String stringContents = FileUtil.getFileContents(settingsFile);
+            return (JSONObject) parser.parse(stringContents);
+        } catch(Exception ex) {
+            return null;
+        }
+    }
+
+    /**
+     * Convert a HashMap to json and writes it to the file
+     *
+     * @param settings HashMap<String, String>
+     * @param append If true, append to existing settings in file
+     */
+    public void writeSettings(HashMap<String, String> settings, boolean append) {
+        JSONObject existingSettings;
+        if(append && (existingSettings = getSettings()) != null) {
+            existingSettings.putAll(settings);
+            settings = existingSettings;
+        }
+
+        try {
+            if (!settingsFile.exists()) {
+                settingsFile.createNewFile();
+            }
+            FileUtil.writeFileContents(settingsFile, new JSONObject(settings).toJSONString());
+
+        } catch (Exception ignore) {
+            ignore.printStackTrace();
+        }
+
+    }
+
+    /**
+     * Adds a setting, or overwrites it if it exists
+     *
+     * @param key
+     * @param value
+     */
+    public void addSetting(String key, String value) {
+        HashMap<String, String> pair = new HashMap<>();
+        pair.put(key, value);
+        writeSettings(pair, true);
+    }
+
+    /**
+     * Fetches a setting
+     *
+     * @param key
+     * @return
+     */
+    public String getSetting(String key) {
+        if(getSettings() == null) {
+            return null;
+        }
+
+        return getSettings().get(key).toString();
+    }
+
+    /**
+     * Adjusts an existing setting
+     *
+     * @param key
+     * @param value
+     */
+    public void adjustSetting(String key, String value) {
+        addSetting(key, value);
+    }
+
+    /**
+     * Removes a setting
+     *
+     * @param key
+     */
+    public void removeSetting(String key) {
+        JSONObject json = getSettings();
+        json.remove(key);
+        writeSettings(json, false);
+    }
+
+    private static String secureFileName(String fileName) {
+        return fileName.replace("..", "");
+    }
+}