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find-bindings.ts
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find-bindings.ts
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// Copyright IBM Corp. 2019. All Rights Reserved.
// Node module: @loopback/example-context
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT
import {
bind,
BindingFilter,
BindingTemplate,
Context,
createBindingFromClass,
filterByTag,
} from '@loopback/context';
interface Greeter {
language: string;
greet(name: string): string;
}
const asGreeter: BindingTemplate = binding => {
binding.tag('greeter');
};
const greeterFilter: BindingFilter = binding =>
binding.tagMap['greeter'] != null;
class ChineseGreeter implements Greeter {
language = 'zh';
greet(name: string) {
return `你好,${name}!`;
}
}
@bind(asGreeter)
class EnglishGreeter implements Greeter {
language = 'en';
greet(name: string) {
return `Hello, ${name}!`;
}
}
export async function main() {
const ctx = new Context('request');
// Add EnglishGreeter for now
ctx.add(createBindingFromClass(EnglishGreeter, {namespace: 'greeters'}));
// Add ChineseGreeter
ctx
.bind('greeters.ChineseGreeter')
.toClass(ChineseGreeter)
.tag('greeter');
const enlishGreeterBinding = ctx.getBinding('greeters.EnglishGreeter');
console.log(enlishGreeterBinding.key);
let possibleEnglishGreeters = ctx.find('*.EnglishGreeter');
console.log(possibleEnglishGreeters.map(b => b.key));
possibleEnglishGreeters = ctx.find(/\w+\.EnglishGreeter$/);
console.log(possibleEnglishGreeters.map(b => b.key));
let greeterBindings = ctx.findByTag('greeter');
console.log(greeterBindings.map(b => b.key));
greeterBindings = ctx.find(filterByTag('greeter'));
console.log(greeterBindings.map(b => b.key));
greeterBindings = ctx.find(greeterFilter);
console.log(greeterBindings.map(b => b.key));
const view = ctx.createView(greeterFilter, (b1, b2) =>
b1.key.localeCompare(b2.key),
);
console.log(view.bindings.map(b => b.key));
}
if (require.main === module) {
main().catch(err => {
console.error(err);
process.exit(1);
});
}