superset LazyFactory 源码
superset LazyFactory 代码
文件路径：/superset-frontend/packages/superset-ui-core/src/dimension/svg/LazyFactory.ts
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
export default class LazyFactory<T extends HTMLElement | SVGElement> {
private activeNodes = new Map<
HTMLElement | SVGElement,
{
counter: number;
node: T;
}
>();
private factoryFn: () => T;
constructor(factoryFn: () => T) {
this.factoryFn = factoryFn;
}
createInContainer(container: HTMLElement | SVGElement = document.body) {
if (this.activeNodes.has(container)) {
const entry = this.activeNodes.get(container)!;
entry.counter += 1;
return entry.node;
}
const node = this.factoryFn();
container.append(node);
this.activeNodes.set(container, { counter: 1, node });
return node;
}
removeFromContainer(container: HTMLElement | SVGElement = document.body) {
if (this.activeNodes.has(container)) {
const entry = this.activeNodes.get(container)!;
entry.counter -= 1;
if (entry.counter === 0) {
container.removeChild(entry.node);
this.activeNodes.delete(container);
}
}
}
}
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