Android Open Source - growthpush-android Preference

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License

The source code is released under:

Apache License

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Java Source Code

package com.growthpush;
/*from  w ww .  ja v  a2 s  .  com*/
import java.io.FileOutputStream;
import java.io.IOException;

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

import android.content.Context;

import com.growthpush.model.Client;
import com.growthpush.model.Tag;
import com.growthpush.utils.IOUtils;

public class Preference {

  private static final String FILE_NAME = "growthpush-preferences";
  private static final String CLIENT_KEY = "client";
  private static final String TAG_KEY = "tags";

  private static Preference instance = new Preference();

  private Context context = null;
  private JSONObject preferences = null;

  private Preference() {
    super();
  }

  public static Preference getInstance() {
    return instance;
  }

  public void setContext(Context context) {
    this.context = context;
  }

  public Client fetchClient() {

    JSONObject clientJsonObject = fetch(CLIENT_KEY);
    if (clientJsonObject == null)
      return null;

    Client client = new Client();
    client.setJsonObject(clientJsonObject);

    return client;

  }

  public Tag fetchTag(String name) {

    JSONObject tagsJsonObject = fetch(TAG_KEY);
    if (tagsJsonObject == null)
      return null;
    if (!tagsJsonObject.has(name))
      return null;

    Tag tag = new Tag();
    try {
      tag.setJsonObject(tagsJsonObject.getJSONObject(name));
    } catch (JSONException e) {
    }

    return tag;

  }

  public synchronized void saveClient(Client client) {

    if (client == null)
      throw new IllegalArgumentException("Argument client cannot be null.");

    save(CLIENT_KEY, client.getJsonObject());

  }

  public synchronized void saveTag(Tag tag) {

    if (tag == null)
      throw new IllegalArgumentException("Argument tag cannot be null.");

    JSONObject tags = fetch(TAG_KEY);
    if (tags == null)
      tags = new JSONObject();

    try {
      tags.put(tag.getName(), tag.getJsonObject());
    } catch (JSONException e) {
    }

    save(TAG_KEY, tags);

  }

  public void deleteClient() {
    save(CLIENT_KEY, null);
  }

  public void deleteTags() {
    save(TAG_KEY, null);
  }

  private JSONObject fetch(String key) {

    try {
      return getPreferences().getJSONObject(key);
    } catch (JSONException e) {
      return null;
    }

  }

  private void save(String key, JSONObject jsonObject) {

    JSONObject preferences = getPreferences();
    try {
      preferences.put(key, jsonObject);
    } catch (JSONException e) {
      return;
    }

    synchronized (this) {
      try {
        FileOutputStream fileOutputStream = context.openFileOutput(FILE_NAME, Context.MODE_PRIVATE);
        fileOutputStream.write(preferences.toString().getBytes());
        fileOutputStream.flush();
      } catch (IOException e) {
      }
    }

  }

  private synchronized JSONObject getPreferences() {

    if (context == null)
      throw new IllegalStateException("Context is null.");

    if (this.preferences == null) {
      try {
        String json = IOUtils.toString(context.openFileInput(FILE_NAME));
        this.preferences = new JSONObject(json);
      } catch (IOException e) {
      } catch (JSONException e) {
      }
    }

    if (this.preferences == null)
      this.preferences = new JSONObject();

    return preferences;

  }
}

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