Android Open Source - swazam Request Store

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License

The source code is released under:

MIT License

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Java Source Code

package at.saws2013.szazam.store.impl;
/*  w  w  w  . j a v  a2 s.c  o m*/
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.json.JSONArray;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import android.content.Context;
import android.content.ContextWrapper;
import android.content.SharedPreferences;
import android.util.Log;
import at.saws2013.szazam.App;
import at.saws2013.szazam.entities.IListItem;
import at.saws2013.szazam.entities.Request;
import at.saws2013.szazam.store.IRequestStore;

/**
 * Singleton class which stores and gets requests from
 * the shared prefereces
 * 
 * @author Ren?
 *
 */
public class RequestStore extends ContextWrapper implements IRequestStore{
  
  private final static String REQUESTS = "requests";
  
  private static volatile RequestStore instance;
  private Gson gson;
  
  private SharedPreferences prefs;

  private RequestStore(Context base) {
    super(base);
    gson = new Gson();
  }
  
  public static RequestStore getInstance(Context context){
    if (instance == null){
      synchronized (RequestStore.class) {
        if (instance == null){
          instance = new RequestStore(context);
        }
      }
    }
    return instance;
  }

  @Override
  public List<IListItem> getRequestHistory() {
    prefs = getSharedPreferences(App.PREFS, MODE_MULTI_PROCESS);
    Type collectionType = new TypeToken<List<Request>>(){}.getType();
    String requestsOnDisk = prefs.getString(REQUESTS, null);
    Log.d(REQUESTS, requestsOnDisk);
    List<Request> requests = gson.fromJson(requestsOnDisk, collectionType);
    List<IListItem> requestsList;
    if (requests != null){
      requestsList = new ArrayList<IListItem>(requests);
      Collections.reverse(requestsList);
    } else {
      requestsList = new ArrayList<IListItem>();
    }
    return requestsList;
  }

  @Override
  public void storeRequest(Request request) {
    prefs = getSharedPreferences(App.PREFS, MODE_MULTI_PROCESS);
    Type collectionType = new TypeToken<ArrayList<Request>>(){}.getType();
    List<Request> requests = gson.fromJson(prefs.getString(REQUESTS, null), collectionType);
    if (requests == null){
      requests = new ArrayList<Request>();
    }
    requests.add(request);
    SharedPreferences.Editor editor = prefs.edit();
    editor.putString(REQUESTS, gson.toJson(requests));
    editor.commit();
  }

  public void storeRequests(JSONArray response) {
    prefs = getSharedPreferences(App.PREFS, MODE_MULTI_PROCESS);
    SharedPreferences.Editor editor = prefs.edit();
    editor.putString(REQUESTS, response.toString());
    editor.commit();
  }

  public List<IListItem> transformToList(JSONArray responseJSON) {
    Type collectionType = new TypeToken<List<Request>>(){}.getType();
    List<Request> requests = gson.fromJson(responseJSON.toString(), collectionType);
    List<IListItem> requestsList;
    if (requests != null){
      requestsList = new ArrayList<IListItem>(requests);
      Collections.reverse(requestsList);
    } else {
      requestsList = new ArrayList<IListItem>();
    }
    return requestsList;
  }

}

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