Preference.java

package ua.kpi.ecampus.ui;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;

import com.google.gson.Gson;
import ua.kpi.ecampus.Config;
import ua.kpi.ecampus.di.ActivityContext;
import ua.kpi.ecampus.model.pojo.Item;
import ua.kpi.ecampus.model.pojo.Token;
import ua.kpi.ecampus.model.pojo.User;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

import javax.inject.Inject;

/**
 * Implement queries to SharedPrefernces.
 * <p>
 * Created by Administrator on 21.03.2016.
 */
public class Preference {

    private Activity mActivityContext;
    private SharedPreferences mSharedPrefs;

    @Inject
    public Preference(@ActivityContext Context context) {
        mActivityContext = (Activity) context;
        mSharedPrefs = mActivityContext.getSharedPreferences(Config
                .SHARED_PREF_NAME, Context.MODE_PRIVATE);
    }

    /**
     * Save login values to the SharedPreferences.
     */
    public void saveLoginInfo(Token token) {
        SharedPreferences.Editor editor = mSharedPrefs.edit();
        //Adding values to editor
        editor.putBoolean(Config.IS_LOGGED_SHARED_PREF, true);
        editor.putString(Config.TOKEN_SHARED_PREF, token.getAccessToken());
        editor.putLong(Config.EXPIRES_IN_SHARED_PREF, expiresTime(token));

        //Saving values to editor
        editor.commit();
    }

    /**
     * Get value is user logged.
     *
     * @return is logged.
     */
    public boolean getIsLogged() {
        return mSharedPrefs.getBoolean(Config.IS_LOGGED_SHARED_PREF, false);
    }

    /**
     * Save logout values to the SharedPreferences.
     */
    public void saveLogoutInfo() {
        SharedPreferences.Editor editor = mSharedPrefs.edit();
        editor.putBoolean(Config.IS_LOGGED_SHARED_PREF, false);
        editor.putString(Config.TOKEN_SHARED_PREF, "");
        editor.commit();
    }

    /**
     * Save information about user to the SharedPreferences.
     *
     * @param user
     */
    public void saveUserInfo(User user) {
        SharedPreferences.Editor editor = mSharedPrefs.edit();
        editor.putString(Config.USER_ID, user.id);
        editor.putString(Config.USER_NAME, user.name);
        Gson gson = new Gson();
        editor.putString(Config.USER_POSITION, gson.toJson(user.position));
        editor.putString(Config.USER_SUBDIVISION, gson.toJson(user
                .subdivision));
        editor.putBoolean(Config.USER_IS_BB_MODERATOR, user
                .isBulletinBoardModerator);
        editor.commit();
    }

    /**
     * Get user's id.
     *
     * @return id
     */
    public String getUserId() {
        return mSharedPrefs.getString(Config.USER_ID, "");
    }

    /**
     * Get user's name.
     *
     * @return name.
     */
    public String getUserName() {
        return mSharedPrefs.getString(Config.USER_NAME, "");
    }

    /**
     * Get user positions.
     *
     * @return list of user's positions.
     */
    public List<Item> getUserPositions() {
        String jsonPositions = mSharedPrefs.getString(Config.USER_POSITION, "");
        Gson gson = new Gson();
        Item[] positions = gson.fromJson(jsonPositions, Item[].class);
        return (positions != null) ? new ArrayList(Arrays.asList(positions))
                : new ArrayList<>();
    }

    /**
     * Get user subdivisions.
     *
     * @return list of user's subdivisions.
     */
    public List<Item> getUserSubdivisions() {
        String jsonPositions = mSharedPrefs.getString(Config
                .USER_SUBDIVISION, "");
        Gson gson = new Gson();
        Item[] subdiv = gson.fromJson(jsonPositions, Item[].class);
        return (subdiv != null) ? new ArrayList(Arrays.asList(subdiv)) : new
                ArrayList<>();
    }

    /**
     * Get value whether user is moderator of Bulletin Board.
     *
     * @return true - if user is moderator, false - otherwise.
     */
    public boolean getIsUserBbModerator() {
        return mSharedPrefs.getBoolean(Config.USER_IS_BB_MODERATOR, false);
    }

    /**
     * Get authentication token.
     *
     * @return token string.
     */
    public String getToken() {
        return mSharedPrefs.getString(Config.TOKEN_SHARED_PREF, "");
    }

    /**
     * Get token expiration date in milliseconds from SharedPreferences.
     *
     * @return datetime in milliseconds
     */
    public Date getTokenExpirationDate() {
        return new Date(mSharedPrefs.getLong(Config.EXPIRES_IN_SHARED_PREF, 0));
    }

    /**
     * Compose token expiration time in milliseconds
     *
     * @param token
     * @return expiration time in milliseconds
     */
    private long expiresTime(Token token) {
        int seconds = token.getExpiresIn();
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.SECOND, seconds);
        Date date = calendar.getTime();
        return date.getTime();
    }
}