From deed2f624d93590c4929682839fae6c367684497 Mon Sep 17 00:00:00 2001
From: y20k <mail@y20k.org>
Date: Mon, 26 Sep 2016 15:25:25 +0200
Subject: [PATCH] storage helper only keeps on track for now - old ones get
 deleted

---
 .../y20k/trackbook/helpers/StorageHelper.java | 20 ++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/app/src/main/java/org/y20k/trackbook/helpers/StorageHelper.java b/app/src/main/java/org/y20k/trackbook/helpers/StorageHelper.java
index 1f55eee..e51d657 100644
--- a/app/src/main/java/org/y20k/trackbook/helpers/StorageHelper.java
+++ b/app/src/main/java/org/y20k/trackbook/helpers/StorageHelper.java
@@ -34,7 +34,11 @@ import java.io.FileWriter;
 import java.io.IOException;
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.Date;
+import java.util.List;
 import java.util.Locale;
 
 
@@ -53,8 +57,11 @@ public class StorageHelper implements TrackbookKeys {
 
     /* Constructor */
     public StorageHelper(Activity activity) {
+        // store activity
         mActivity = activity;
-        mFolder  = mActivity.getExternalFilesDir("Tracks");
+
+        // set name sub-directory to "tracks"
+        mFolder  = mActivity.getExternalFilesDir("tracks");
         // mFolder = getTracksDirectory();
 
         // create folder if necessary
@@ -71,6 +78,8 @@ public class StorageHelper implements TrackbookKeys {
         Date recordingStart = track.getRecordingStart();
 
         if (mFolder.exists() && mFolder.isDirectory() && mFolder.canWrite() && recordingStart != null) {
+            File lastTrackFile = getLastTrack();
+
             // construct filename from track recording date
             DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss", Locale.US);
             String fileName = dateFormat.format(recordingStart) + ".trackbook";
@@ -86,8 +95,12 @@ public class StorageHelper implements TrackbookKeys {
                 bw.write(json);
             } catch (IOException e) {
                 LogHelper.e(LOG_TAG, "Unable to saving track to external storage (IOException): " + file.toString());
+                return false;
             }
 
+            // if write was successful delete last file
+            lastTrackFile.delete();
+
             return true;
 
         } else {
@@ -128,9 +141,10 @@ public class StorageHelper implements TrackbookKeys {
     /* Gets the last track from directory */
     public File getLastTrack() {
         if (mFolder != null && mFolder.isDirectory()) {
-            File[] files = mFolder.listFiles();
+            List<File> files = new ArrayList<File>(Arrays.asList(mFolder.listFiles()));
+            Collections.sort(files);
             // TODO
-            return files[0];
+            return files.get(files.size() - 1);
         }
         // TODO
         return null;