Android Open Source - Lister I O

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License

The source code is released under:

MIT License

Java Source Code

package com.liamfruzyna.android.lister.Data;
// w ww  .ja  v a 2s. c  o m
import com.liamfruzyna.android.lister.Activities.WLActivity;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by mail929 on 11/6/14.
 */
public class IO
{
    static String fileDir = DataContainer.dir;

    //turns app data into a string of json data
    public static void save(List<WishList> lists)
    {
        try
        {
            JSONArray jlists = new JSONArray();
            for (int i = 0; i < lists.size(); i++)
            {
                JSONObject jlist = new JSONObject();
                jlist.put("name", lists.get(i).name);
                JSONArray jitems = new JSONArray();
                List<Item> items = lists.get(i).items;
                for (int j = 0; j < items.size(); j++)
                {
                    JSONObject jitem = new JSONObject();
                    jitem.put("item", items.get(j).item);
                    jitem.put("done", items.get(j).done);
                    jitem.put("archived", items.get(j).archived);
                    jitems.put(jitem);
                }
                jlist.put("items", jitems);
                JSONArray jtags = new JSONArray();
                List<String> tags = lists.get(i).tags;
                for (int j = 0; j < tags.size(); j++)
                {
                    jtags.put(tags.get(j));
                }
                jlist.put("tags", jtags);
                jlists.put(jlist);
            }
            writeToFile(jlists.toString());
        } catch (JSONException e)
        {
            e.printStackTrace();
        }
    }

    //converts a string of json data to useable lists
    public static List<WishList> load() throws JSONException, MalformedURLException
    {
        List<WishList> lists = new ArrayList<WishList>();
        JSONArray jlists = new JSONArray(readFromFile());
        for (int i = 0; i < jlists.length(); i++)
        {
            JSONObject jlist = jlists.getJSONObject(i);
            List<Item> items = new ArrayList<Item>();
            JSONArray jitems = jlist.getJSONArray("items");
            for (int j = 0; j < jitems.length(); j++)
            {
                Item item = new Item(jitems.getJSONObject(j).getString("item"), jitems.getJSONObject(j).getBoolean("done"), jitems.getJSONObject(j).getBoolean("archived"));
                items.add(item);
            }
            List<String> tags = new ArrayList<String>();
            JSONArray jtags = jlist.getJSONArray("tags");
            for (int j = 0; j < jtags.length(); j++)
            {
                tags.add(jtags.getString(j));
            }
            lists.add(new WishList(jlist.getString("name"), items, tags));
        }
        return lists;
    }

    //takes a string of data and writes it to the save file
    private static void writeToFile(String data)
    {
        File file = new File(fileDir, "data.json");
        try
        {
            BufferedWriter bw = new BufferedWriter(new FileWriter(file));
            bw.write(data);
            bw.close();
        } catch (IOException e)
        {
            e.printStackTrace();
        }
    }

    //gets a string of data from the save file
    public static String readFromFile()
    {
        File file = new File(fileDir, "data.json");
        if (!file.exists())
        {
            try
            {
                file.createNewFile();
            } catch (IOException e)
            {
                e.printStackTrace();
            }
        }
        StringBuilder sb = new StringBuilder();
        try
        {
            BufferedReader br = new BufferedReader(new FileReader(file));
            String line;
            while ((line = br.readLine()) != null)
            {
                sb.append(line);
            }
            return sb.toString();
        } catch (IOException e)
        {
            e.printStackTrace();
        }
        return "";
    }
}

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