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// Copyright IBM Corp. 2018. All Rights Reserved. | ||
// Node module: @loopback/context | ||
// This file is licensed under the MIT License. | ||
// License text available at https://opensource.org/licenses/MIT | ||
|
||
import {ClassDecoratorFactory} from '@loopback/metadata'; | ||
import { | ||
asBindingTemplate, | ||
asProvider, | ||
BindingMetadata, | ||
BindingSpec, | ||
BINDING_METADATA_KEY, | ||
isProviderClass, | ||
asClassOrProvider, | ||
removeNameAndKeyTags, | ||
} from './binding-inspector'; | ||
import {Provider} from './provider'; | ||
import {Constructor} from './value-promise'; | ||
|
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/** | ||
* Decorator factory for `@bind` | ||
*/ | ||
class BindDecoratorFactory extends ClassDecoratorFactory<BindingMetadata> { | ||
mergeWithInherited(inherited: BindingMetadata, target: Function) { | ||
if (inherited) { | ||
return { | ||
templates: [ | ||
...inherited.templates, | ||
removeNameAndKeyTags, | ||
...this.spec.templates, | ||
], | ||
target: this.spec.target, | ||
}; | ||
} else { | ||
this.withTarget(this.spec, target); | ||
return this.spec; | ||
} | ||
} | ||
|
||
withTarget(spec: BindingMetadata, target: Function) { | ||
spec.target = target as Constructor<unknown>; | ||
return spec; | ||
} | ||
} | ||
|
||
/** | ||
* Decorate a class with binding configuration | ||
* | ||
* @example | ||
* ```ts | ||
* @bind((binding) => {binding.inScope(BindingScope.SINGLETON).tag('controller')} | ||
* ) | ||
* export class MyController { | ||
* } | ||
* ``` | ||
* | ||
* @param specs A list of binding scope/tags or template functions to | ||
* configure the binding | ||
*/ | ||
export function bind(...specs: BindingSpec[]): ClassDecorator { | ||
const templateFunctions = specs.map(t => { | ||
if (typeof t === 'function') { | ||
return t; | ||
} else { | ||
return asBindingTemplate(t); | ||
} | ||
}); | ||
|
||
return (target: Function) => { | ||
const cls = target as Constructor<unknown>; | ||
const spec: BindingMetadata = { | ||
templates: [asClassOrProvider(cls), ...templateFunctions], | ||
target: cls, | ||
}; | ||
|
||
const decorator = BindDecoratorFactory.createDecorator( | ||
BINDING_METADATA_KEY, | ||
spec, | ||
); | ||
decorator(target); | ||
}; | ||
} | ||
|
||
export namespace bind { | ||
/** | ||
* `@bind.provider` to denote a provider class | ||
* | ||
* A list of binding scope/tags or template functions to configure the binding | ||
*/ | ||
export function provider( | ||
...specs: BindingSpec[] | ||
): ((target: Constructor<Provider<unknown>>) => void) { | ||
return (target: Constructor<Provider<unknown>>) => { | ||
if (!isProviderClass(target)) { | ||
throw new Error(`Target ${target} is not a Provider`); | ||
} | ||
bind( | ||
// Set up the default for providers | ||
asProvider(target), | ||
// Call other template functions | ||
...specs, | ||
)(target); | ||
}; | ||
} | ||
} |
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