88 lines
2.5 KiB
Plaintext
88 lines
2.5 KiB
Plaintext
/*
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* Copyright (C) 2021 Huawei Device Co., Ltd.
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* Licensed under the Apache License, Version 2.0 (the 'License');
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http:// www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an 'AS IS' BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { collections } from '@kit.ArkTS'
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import { DiskCacheEntry } from './DiskCacheEntry';
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@Sendable
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export class CustomSendableMap {
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map: collections.Map<string, DiskCacheEntry> = new collections.Map<string, DiskCacheEntry>()
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// 获取键对应的值
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get(key: string): DiskCacheEntry | undefined{
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if (key == null) {
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throw new Error('key is null,checking the parameter');
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}
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return this.map.get(key)
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}
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/**
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* 是否含有key的缓存
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*/
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hasKey(key: string):boolean {
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if (key == null) {
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throw new Error('key is null,checking the parameter');
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}
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return this.map.has(key)
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}
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// 添加键值对
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put(key: string, value: DiskCacheEntry): DiskCacheEntry | undefined{
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if (key == null || value == null) {
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throw new Error('key or value is invalid,checking the parameter');
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}
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let pre = this.map.get(key) as DiskCacheEntry | undefined;
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if (this.hasKey(key)) {
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this.map.delete(key)
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}
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this.map.set(key, value);
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return pre
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}
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// 去除键值，(去除键数据中的键名及对应的值)
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remove(key: string): boolean {
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if (key == null) {
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throw new Error('key is null,checking the parameter');
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}
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return this.map.delete(key)
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}
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/**
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* 获取最先存储的数据的key
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*/
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getFirstKey(): string{ // keys()可以遍历后需要优化put()方法，暂时仅获取index=0的key
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return this.map.keys().next().value
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}
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// 判断键值元素是否为空
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isEmpty(): boolean{
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return this.map.size == 0;
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}
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// 获取键值元素大小
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size(): number{
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return this.map.size;
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}
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// 遍历Map,执行处理函数. 回调函数 function(key,value,index){..}
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each(fn: (value: DiskCacheEntry, key: string, map: collections.Map<string, DiskCacheEntry>) => void) {
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this.map.forEach(fn)
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}
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// 清除键值对
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clear() {
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this.map.clear()
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}
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// 遍历key
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keys(): IterableIterator<string>{
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return this.map.keys()
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}
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} |