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container.js
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container.js
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/**
* @module container
* @private
*/
/**
* Creates an empty service container.
*
* @return {Container}
*/
export default function createContainer() {
const factories = {},
cache = {};
/**
* The interface implemented by all service containers.
*/
return {
/**
* Defines a service.
*
* @method
* @name Container#set
* @param {string} name
* @param {any} factory
*/
set( name, factory ) {
factories[ name ] = factory;
},
/**
* Gets whether a service has been defined.
*
* @method
* @name Container#has
* @param {string} name
* @return {boolean} `true` if the service has been defined; otherwise,
* `false`
*/
has( name ) {
return Object.prototype.hasOwnProperty.call( factories, name );
},
/**
* Gets a service.
*
* If the service was defined with a factory function, then the factory
* function is called and the result is returned. For performance reasons,
* the result of calling the factory function is cached.
*
* If the service was defined with a value, then the value is returned.
*
* @example
* var container = createContainer();
*
* container.set( 'foo', true );
* container.set( 'baz', ( c ) => {
* if ( c.get( 'foo' ) ) {
* return 'qux';
* }
*
* return 'quux';
* } );
*
* @method
* @name Container#get
* @param {string} name
* @return {any}
* @throws Error If the service hasn't been defined
*/
get( name ) {
if ( !this.has( name ) ) {
throw new Error( `The service "${ name }" hasn't been defined.` );
}
const factory = factories[ name ];
if ( typeof factory !== 'function' ) {
return factory;
}
if ( !Object.prototype.hasOwnProperty.call( cache, name ) ) {
cache[ name ] = factory( this );
}
return cache[ name ];
}
};
}

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