package com.kf5.sdk.system.mvp.presenter;

import com.kf5.sdk.system.mvp.view.MvpView;

import static com.kf5.sdk.system.utils.StatusCode.STATUS_ERROR;
import static com.kf5.sdk.system.utils.StatusCode.STATUS_OK;

/**
 * author:chosen
 * date:2016/10/13 15:00
 * email:812219713@qq.com
 */

public class BasePresenter<V extends MvpView> implements Presenter<V> {

    protected static final int RESULT_OK = STATUS_OK;

    protected static final int RESULT_ERROR = STATUS_ERROR;

    /**
     * 当前连接的View
     */
    private V mvpView;

    /**
     * Presenter与View建立连接
     *
     * @param mvpView 与此Presenter相对应的View
     */
    @Override
    public void attachView(V mvpView) {
        this.mvpView = mvpView;
    }

    /**
     * Presenter与View连接断开
     */
    @Override
    public void detachView() {
        this.mvpView = null;
    }


    /**
     * 是否与View建立连接
     *
     * @return
     */
    public boolean isViewAttached() {
        return mvpView != null;
    }


    /**
     * 获取当前连接的View
     *
     * @return
     */
    public V getMvpView() {
        return mvpView;
    }

    /**
     * 每次调用业务请求的时候都要先调用方法检查是否与View建立连接，没有则抛出异常
     */
    public void checkViewAttached() {
        if (!isViewAttached())
            throw new MvpViewNotAttachedException();
    }

    public static class MvpViewNotAttachedException extends RuntimeException {
        public MvpViewNotAttachedException() {
            super("请求数据前请先调用 attachView(MvpView) 绑定View");
        }
    }

}