References

Implements: IReferences

Description

The References class allows you to store and locate component references.

Constructors

Creates a new instance of References and initializes it with references.

public constructor(tuples: any[] = null)

• tuples: any[] - (optional) list of values where odd elements are locators and the following even elements are component references.

Fields

Instance methods

find

Gets all component references that match a specified locator.
Throws a ReferenceException when required is set to true but no references were found.

public find<T>(locator: any, required: boolean): T[]

• locator: any - locator to find a reference by.
• required: boolean - forces to raise an exception if no reference is found.
• returns: T[] - list with matching component references.

getAll

Gets all component references registered in this reference map.

public getAll(): any[]

• returns: any[] - list with component references.

getAllLocators

Gets locators for all registered component references in this reference map.

public getAllLocators(): any[]

• returns: any[] - list with component locators.

getOneOptional

Gets an optional component reference that matches a specified locator.

public getOneOptional<T>(locator: any): T

• locator: any - locator to find references by.
• returns: T - matching component reference or null if nothing was found.

getOneRequired

Gets a required component reference that matches specified locator.
throws a ReferenceException when no references found.

public getOneRequired<T>(locator: any): T

• locator: any - locator to find a reference by.
• returns: T - matching component reference.

getOptional

Gets all component references that match a specified locator.

public getOptional<T>(locator: any): T[]

• locator: any - locator to find references by.
• returns: T[] - list with matching component references or empty list if nothing was found.

getRequired

Gets all component references that match a specified locator. At least one component reference must be present. If it doesn’t the method throws an error. Throws a ReferenceException when no references found.

public getRequired<T>(locator: any): T[]

• locator: any - locator to find references by.
• returns: T[] - list with matching component references.

put

Puts a new reference into this reference map.

public put(locator: any, component: any): void

• locator: any - locator to find the reference by.
• component: any - component reference to be added.

remove

Removes a previously added reference that matches specified locator. If many references match the locator, it removes only the first one. When all references shall be removed, use removeAll method instead.

public remove(locator: any): any

• locator: any - locator to remove reference
• returns: any - removed component reference.

removeAll

Removes all component references that match the specified locator.

public removeAll(locator: any): any[]

• locator: any - locator to remove references by.
• returns: any[] - list containing all removed references.

Static methods

fromTuples

Creates a new References from a list of key-value pairs called tuples.

public static fromTuples(…tuples: any[]): References

• tuples: any[] - list of values where odd elements are locators and the following even elements are component references
• returns: References - newly created References.

Examples

export class MyController implements IReferenceable {
    public _persistence: IMyPersistence;
    ...    
    public setReferences(references: IReferences): void {
        this._persistence = references.getOneRequired<IMyPersistence>(
            new Descriptor("mygroup", "persistence", "*", "*", "1.0")
        );
    }
    ...
}
  
let persistence = new MyMongoDbPersistence();
let controller = new MyController();
  
let references = References.fromTuples(
    new Descriptor("mygroup", "persistence", "mongodb", "default", "1.0"), persistence,
    new Descriptor("mygroup", "controller", "default", "default", "1.0"), controller
);

controller.setReferences(references);

See also

• IReferences