isu-elements/utils/cacheSearchUtil.js

Polymer components for building web apps.

/**
 * 缓存搜索的插件
 *
 * 缓存数据结构_cacheItems:
 * [{item: {label:"天猫",business:"塑料"}, searches: ["天猫","KUAISUWANG","KSW","塑料","SULIAO","SL"],matchCount:0},
 *  {item: {label:"京东",business:"电商"}, searches: ["京东","JINGDONG","JD","电商","DIANSHANG","DS"],matchCount:0 }]
 *
 */
export class CacheSearchUtil {
  constructor() {
    this.resetCache();
  }
  
  /**
   * 查询
   * @param keyword 关键字
   * @param separator
   * @returns {Array.<*>}
   */
  search(keyword = "", separator = ",") {
    let parts = keyword.toUpperCase().trim().split(separator);
    /**
     * 匹配的结果集
     * 1.filter操作：将关键字匹配的cacheItem过滤出来，得到匹配缓存数组
     * 2.map操作：将匹配的缓存项的匹配计数器matchCount加1
     * 3.sort操作：通过匹配计数器matchCount按从大到小对结果集排序
     * 4.map操作：返回pojo数组
     */
    return this._cacheItems.filter(
      cacheItem => parts.every(part => cacheItem.searches.some(s => s.indexOf(part) > -1))
    ).map(cacheItem => {
      cacheItem.matchCount++;
      return cacheItem
    }).sort((prev, next) => next.matchCount - prev.matchCount
    ).map(
      cacheItem => cacheItem.item
    );
  }
  
  /**
   * 新增缓存项
   * @param item 缓存对象POJO 如:{label:"天猫",business:"塑料"}
   * @param searches 缓存对象搜索关键字符串数组，包含了item的特定字段值，特定字段的全拼、简拼字符串,如：["天猫","KUAISUWANG","KSW","塑料","SULIAO","SL"]
   */
  addCacheItem(item, searches) {
    this._cacheItems.push({"item": item, "searches": searches, matchCount: 0});
  }
  
  /**
   * 重置索引缓存
   */
  resetCache() {
    this._cacheItems = [];
  }
}