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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
import { Pipe, PipeTransform } from '@angular/core';
import { ITranslateArgs, TranslateService } from './translate.service';
// tslint:disable-next-line:interface-name
interface ITranslateParams {
phrase: string;
args: ITranslateArgs;
language: string;
}
@Pipe({
name: 'translate',
pure: false
})
export class TranslatePipe implements PipeTransform {
private translated: string;
private lastParams: ITranslateParams = {
phrase: undefined,
args: undefined,
language: undefined
};
constructor(private translateService: TranslateService) {
}
public transform(phrase: string, args: ITranslateArgs, language: string = this.translateService.activeLanguage): string {
const curParams: ITranslateParams = { phrase, args, language };
if (this.shouldUpdate(curParams)) {
this.lastParams = curParams;
this.translated = this.translateService.translate(phrase, args, language);
}
return this.translated;
}
private shouldUpdate(curParams: ITranslateParams): boolean {
return (
curParams.language !== this.lastParams.language ||
curParams.args !== this.lastParams.args ||
curParams.phrase !== this.lastParams.phrase
);
}
}
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