87 lines
1.7 KiB
JavaScript
87 lines
1.7 KiB
JavaScript
/**
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* @flow
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*/
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import Reference from './reference.js';
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import { isObject, deepGet, deepExists } from './../../utils';
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export default class Snapshot {
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static key: String;
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static value: Object;
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static exists: boolean;
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static hasChildren: boolean;
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static childKeys: String[];
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ref: Object;
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key: string;
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value: any;
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exists: boolean;
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priority: any;
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childKeys: Array<string>;
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constructor(ref: Reference, snapshot: Object) {
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this.ref = ref;
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this.key = snapshot.key;
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this.value = snapshot.value;
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this.exists = snapshot.exists || true;
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this.priority = snapshot.priority === undefined ? null : snapshot.priority;
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this.childKeys = snapshot.childKeys || [];
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}
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/*
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* DEFAULT API METHODS
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*/
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val() {
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return this.value;
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}
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child(path: string) {
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const value = deepGet(this.value, path);
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const childRef = this.ref.child(path);
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return new Snapshot(childRef, {
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value,
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key: childRef.key,
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exists: value !== null,
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childKeys: isObject(value) ? Object.keys(value) : [],
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});
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}
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exists() {
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return this.value !== null;
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}
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forEach(fn: (key: any) => any) {
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return this.childKeys.forEach((key, i) => fn(this.child(key), i));
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}
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getPriority() {
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return this.priority;
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}
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hasChild(path: string) {
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return deepExists(this.value, path);
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}
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hasChildren() {
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return this.numChildren() > 0;
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}
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numChildren() {
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if (!isObject(this.value)) return 0;
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return Object.keys(this.value).length;
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}
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/*
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* EXTRA API METHODS
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*/
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map(fn: (key: string) => mixed) {
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const arr = [];
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this.forEach((item, i) => arr.push(fn(item, i)));
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return arr;
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}
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reverseMap(fn: (key: string) => mixed) {
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return this.map(fn).reverse();
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}
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}
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