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* 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 type QueryStateState = 'init' | 'loading' | 'data' | 'error';
export class QueryState<T> {
static INIT: QueryState<any> = new QueryState({});
public state: QueryStateState = 'init';
public error?: string;
public data?: T;
constructor(opts: { loading?: boolean; error?: string; data?: T }) {
Iif (opts.error) {
if (opts.data) {
throw new Error('can not have both error and data');
} else {
this.state = 'error';
this.error = opts.error;
}
} else {
Iif (opts.data) {
this.state = 'data';
this.data = opts.data;
} else {
this.state = opts.loading ? 'loading' : 'init';
}
}
}
isInit(): boolean {
return this.state === 'init';
}
isLoading(): boolean {
return this.state === 'loading';
}
}
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