react-native-firebase-for-netmera/dist/modules/database/Query.js

.

/**
 * 
 * Query representation wrapper
 */
import { objectToUniqueId } from '../../utils';
// todo doc methods

/**
 * @class Query
 */
export default class Query {
  constructor(ref, existingModifiers) {
    this.modifiers = existingModifiers ? [...existingModifiers] : [];
    this._reference = ref;
  }
  /**
   *
   * @param name
   * @param key
   * @return {Reference|*}
   */


  orderBy(name, key) {
    this.modifiers.push({
      id: `orderBy-${name}:${key || ''}`,
      type: 'orderBy',
      name,
      key
    });
    return this._reference;
  }
  /**
   *
   * @param name
   * @param limit
   * @return {Reference|*}
   */


  limit(name, limit) {
    this.modifiers.push({
      id: `limit-${name}:${limit}`,
      type: 'limit',
      name,
      limit
    });
    return this._reference;
  }
  /**
   *
   * @param name
   * @param value
   * @param key
   * @return {Reference|*}
   */


  filter(name, value, key) {
    this.modifiers.push({
      id: `filter-${name}:${objectToUniqueId(value)}:${key || ''}`,
      type: 'filter',
      name,
      value,
      valueType: typeof value,
      key
    });
    return this._reference;
  }
  /**
   *
   * @return {[*]}
   */


  getModifiers() {
    return [...this.modifiers];
  }
  /**
   *
   * @return {*}
   */


  queryIdentifier() {
    // sort modifiers to enforce ordering
    const sortedModifiers = this.getModifiers().sort((a, b) => {
      if (a.id < b.id) return -1;
      if (a.id > b.id) return 1;
      return 0;
    }); // Convert modifiers to unique key

    let key = '{';

    for (let i = 0; i < sortedModifiers.length; i++) {
      if (i !== 0) key += ',';
      key += sortedModifiers[i].id;
    }

    key += '}';
    return key;
  }

}