package com.fanhl.flamebarchart.sample.util;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Application;
import android.content.Context;
import android.support.annotation.NonNull;

import java.util.LinkedList;

/**
 * <pre>
 *     author:
 *                                      ___           ___           ___         ___
 *         _____                       /  /\         /__/\         /__/|       /  /\
 *        /  /::\                     /  /::\        \  \:\       |  |:|      /  /:/
 *       /  /:/\:\    ___     ___    /  /:/\:\        \  \:\      |  |:|     /__/::\
 *      /  /:/~/::\  /__/\   /  /\  /  /:/~/::\   _____\__\:\   __|  |:|     \__\/\:\
 *     /__/:/ /:/\:| \  \:\ /  /:/ /__/:/ /:/\:\ /__/::::::::\ /__/\_|:|____    \  \:\
 *     \  \:\/:/~/:/  \  \:\  /:/  \  \:\/:/__\/ \  \:\~~\~~\/ \  \:\/:::::/     \__\:\
 *      \  \::/ /:/    \  \:\/:/    \  \::/       \  \:\  ~~~   \  \::/~~~~      /  /:/
 *       \  \:\/:/      \  \::/      \  \:\        \  \:\        \  \:\         /__/:/
 *        \  \::/        \__\/        \  \:\        \  \:\        \  \:\        \__\/
 *         \__\/                       \__\/         \__\/         \__\/
 *     blog  : http://blankj.com
 *     time  : 16/12/08
 *     desc  : utils about initialization
 * </pre>
 */
public final class BlankjUtils {

    @SuppressLint("StaticFieldLeak")
    private static Application sApplication;

    private static LinkedList<Activity> sActivityList = new LinkedList<>();


    private BlankjUtils() {
        throw new UnsupportedOperationException("u can't instantiate me...");
    }

    /**
     * Init utils.
     * <p>Init it in the class of Application.</p>
     *
     * @param context
     *         context
     */
    public static void init(@NonNull final Context context) {
        BlankjUtils.sApplication = (Application) context.getApplicationContext();
    }

    /**
     * Return the context of Application object.
     *
     * @return the context of Application object
     */
    public static Application getApp() {
        if (sApplication != null) return sApplication;
        throw new NullPointerException("u should init first");
    }
}