FileWriter

src/org/kiwix/kiwixmobile/FileWriter.java

@@ -1,11 +1,96 @@
 package org.kiwix.kiwixmobile;
 
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.util.Log;
+
+import java.io.File;
 import java.util.ArrayList;
+import java.util.Arrays;
 
 public class FileWriter {
 
-    public  void saveArray(ArrayList<>){
+    private static final String PREF_NAME = "csv_file";
 
+    private static final String CSV_PREF_NAME = "csv_string";
+
+    private Context mContext;
+
+    private ArrayList<ZimFileSelectActivity.DataModel> mDataList;
+
+    public FileWriter(Context context) {
+        mContext = context;
     }
 
+    public FileWriter(Context context, ArrayList<ZimFileSelectActivity.DataModel> dataList) {
+        mDataList = dataList;
+        mContext = context;
     }
+
+    // Build a CSV list from the file paths
+    public void saveArray(ArrayList<ZimFileSelectActivity.DataModel> files) {
+
+        ArrayList<String> list = new ArrayList<String>();
+
+        for (ZimFileSelectActivity.DataModel file : files) {
+            list.add(file.getPath());
+        }
+
+        StringBuilder sb = new StringBuilder();
+        for (String s : list) {
+            sb.append(s);
+            sb.append(",");
+        }
+
+        saveCsvToPrefrences(sb.toString());
+    }
+
+    // Add items to the MediaStore list, that are not in the MediaStore database.
+    // These will be loaded from a previously saved CSV file.
+    // We are checking, if these file still exist as well.
+    public ArrayList<ZimFileSelectActivity.DataModel> getDataModelList() {
+
+        for (String file : readCsv()) {
+            if (!mDataList.contains(new ZimFileSelectActivity.DataModel(getTitleFromFilePath(file), file))) {
+
+                mDataList.add(new ZimFileSelectActivity.DataModel(getTitleFromFilePath(file), file));
+            }
+        }
+
+        return mDataList;
+    }
+
+    // Split the CSV by the comma and return an ArrayList with the file paths
+    private ArrayList<String> readCsv() {
+
+        String csv = getCsvFromPrefrences();
+
+        String[] csvArray = csv.split(",");
+
+        return new ArrayList<String>(Arrays.asList(csvArray));
+    }
+
+    // Save a CSV file to the prefrences
+    private void saveCsvToPrefrences(String csv) {
+
+        SharedPreferences preferences = mContext.getSharedPreferences(PREF_NAME, 0);
+        SharedPreferences.Editor editor = preferences.edit();
+        editor.putString(CSV_PREF_NAME, csv);
+
+        editor.commit();
+    }
+
+    // Load the CSV from the prefrences
+    private String getCsvFromPrefrences() {
+        SharedPreferences preferences = mContext.getSharedPreferences(PREF_NAME, 0);
+
+        return preferences.getString(CSV_PREF_NAME, "");
+    }
+
+    // Remove the file path and the extension and return a file name for the given file path
+    private String getTitleFromFilePath(String path) {
+        return new File(path).getName().replaceFirst("[.][^.]+$", "");
+    }
+}
+
+