Android Open Source - trivial-lists Trivial List J S O N Serializer

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Back to project page trivial-lists.

License

The source code is released under:

MIT License

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Java Source Code

package org.hbabcock.triviallists;
/*w ww  . j a va2 s  . c o m*/
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONTokener;

import android.content.Context;
import android.util.Log;

public class TrivialListJSONSerializer {
  private static final String TAG = "TrivialListJSONSerializer";

  private Context mContext;
  
  public TrivialListJSONSerializer(Context c){
    mContext = c;
  }

  public ArrayList<Category> loadCategories(String filename) throws IOException, JSONException {
    Log.i(TAG,"loadCategories");

    ArrayList<Category> categories = new ArrayList<Category>();
    
    BufferedReader reader = null;
    try{
        InputStream in = mContext.openFileInput(filename);
        reader = new BufferedReader(new InputStreamReader(in));
        StringBuilder jsonString = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null){
          jsonString.append(line);
        }
        
        JSONArray array = (JSONArray) new JSONTokener(jsonString.toString()).nextValue();

        for (int i = 0; i < array.length(); i++){
        categories.add(new Category(array.getJSONObject(i)));
      }
    }
    catch (FileNotFoundException e){
      
    }
    finally {
      if (reader != null)
        reader.close();
    }
    return categories;
  }

  public ArrayList<Item> loadItems(String filename) throws IOException, JSONException {
    Log.i(TAG,"loadItems");

    ArrayList<Item> items = new ArrayList<Item>();
    
    BufferedReader reader = null;
    try{
        InputStream in = mContext.openFileInput(filename);
        reader = new BufferedReader(new InputStreamReader(in));
        StringBuilder jsonString = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null){
          jsonString.append(line);
        }
        
        JSONArray array = (JSONArray) new JSONTokener(jsonString.toString()).nextValue();

        for (int i = 0; i < array.length(); i++){
        items.add(new Item(array.getJSONObject(i)));
      }
    }
    catch (FileNotFoundException e){
      
    }
    finally {
      if (reader != null)
        reader.close();
    }
    return items;
  }

  public void saveJSON(JSONArray array, String filename) throws IOException{
    Writer writer = null;
    try {
      OutputStream out = mContext.openFileOutput(filename, Context.MODE_PRIVATE);
      writer = new OutputStreamWriter(out);
      writer.write(array.toString());
    }
    finally {
      if (writer != null)
        writer.close();
    }    
  }
  
  public void saveCategories(ArrayList<Category> categories, String filename) throws JSONException, IOException {
    Log.i(TAG,"saveCategories");

    JSONArray array = new JSONArray();
    for (Category c : categories){
      array.put(c.toJSON());
    }

    saveJSON(array, filename);
  }

  public void saveItems(ArrayList<Item> items, String filename) throws JSONException, IOException {
    Log.i(TAG,"saveItems");

    JSONArray array = new JSONArray();
    for (Item i : items){
      array.put(i.toJSON());
    }

    saveJSON(array, filename);
  }

}

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