added base 64 preference

core/src/zero1hd/polyjet/util/Base64Preferences.java

@@ -0,0 +1,48 @@
+package zero1hd.polyjet.util;
+
+import java.util.HashMap;
+
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.files.FileHandle;
+import com.badlogic.gdx.utils.Base64Coder;
+import com.badlogic.gdx.utils.Json;
+
+public class Base64Preferences {
+	FileHandle base64File;
+	HashMap<String, String> prefKeys;
+	Json json;
+	@SuppressWarnings("unchecked")
+	public Base64Preferences(String prefName) {
+		base64File = Gdx.files.external(".prefs/" + prefName);
+		json = new Json();
+		
+		flush();
+	}
+	
+	public void putString(String key, String string) {
+		prefKeys.put(key, string);
+	}
+	
+	public void putObj(String key, Object object) {
+		prefKeys.put(key, json.toJson(object));
+	}
+	
+	public void writeBase64String(String text) {
+		base64File.writeString(Base64Coder.encodeString(text), true);
+	}
+	
+	public void writeBase64Object(Object obj) {
+		base64File.writeString(Base64Coder.encodeString(json.toJson(obj)), true);
+	}
+	
+	public void flush() {
+		prefKeys = json.fromJson(HashMap.class, new String(Base64Coder.decode(base64File.readString())));
+		if (prefKeys == null) {
+			prefKeys = new HashMap<>();
+		}
+		base64File.writeString(null, false);
+		writeBase64Object(json);
+	}
+	
+	
+}