import { IAdapter } from "./IAdapter";
import { List } from "./List";

export abstract class AdapterBase<T> implements IAdapter<T> {

    protected _arr: Array<T> | List<T>;

    constructor(useList: boolean = true) {
        if (useList) {
            this._arr = new List<T>();
        } else {
            this._arr = new Array<T>();
        }
    }

    public add(t: T): void {
        this._arr.push(t);
    }

    /**
     * 弹出顶部元素
     */
    public abstract remove(): T | undefined;

    public get length(): number {
        return this._arr.length;
    }

    public get isEmpty(): boolean {
        return this._arr.length <= 0;
    }

    clear(): void {
        if(this._arr instanceof List){
            this._arr = new List<T>();
        } else {
            this._arr = new Array<T>();
        }
    }

}