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{ removeAll } from 'utilities/array';\r\n\r\nexport interface IObserver<T> {\r\n\t( value: T ): void;\r\n}\r\n\r\nexport interface IObservable<T> {\r\n\taddObserver( observer: IObserver<T> ): boolean;\r\n\tremoveObserver( observer: IObserver<T> ): boolean;\r\n}\r\n\r\nexport interface IObservableValue<T> extends IObservable<T> {\r\n\tvalue: T;\r\n}\r\n\r\nfunction isCallable( foo: any ): foo is Function {\r\n\treturn typeof foo === 'function';\r\n}\r\n\r\nexport class Observable<T> {\r\n\tpublic addObserver( observer: IObserver<T> ) {\r\n\t\tconst { observers } = this;\r\n\t\tif( isCallable( observer ) && observers.indexOf( observer ) < 0 ) {\r\n\t\t\tobservers.push( observer );\r\n\t\t\treturn true;\r\n\t\t} else {\r\n\t\t\treturn false;\r\n\t\t}\r\n\t}\r\n\r\n\tpublic removeObserver( observer: IObserver<T> ) {\r\n\t\treturn removeAll( this.observers, observer ) > 0;\r\n\t}\r\n\r\n\tpublic notify( param: T, next = ( param ) => true ) {\r\n\t\tconst observers = this.observers.filter( isCallable );\r\n\t\tfor( let observer of observers ) {\r\n\t\t\tobserver( param );\r\n\t\t\tif( next( param ) === false ) return false;\r\n\t\t}\r\n\t\treturn true;\r\n\t}\r\n\r\n\tprotected observers: Array<IObserver<T>> = [];\r\n}\r\n\r\nexport class SingleObservable<T> extends Observable<T> {\r\n\tconstructor() {\r\n\t\tsuper();\r\n\t\tthis._promiselike = new Promise( ( resolve, reject ) => {\r\n\t\t\tthis._resolve = value => {\r\n\t\t\t\tif( !this.isPending ) return;\r\n\t\t\t\tthis._isResolved = true;\r\n\t\t\t\tresolve( value );\r\n\t\t\t};\r\n\t\t\tthis._reject = value => {\r\n\t\t\t\tif( !this.isPending ) return;\r\n\t\t\t\tthis._isRejected = true;\r\n\t\t\t\treject( value );\r\n\t\t\t};\r\n\t\t} );\r\n\t}\r\n\r\n\tpublic notify( param: T ) {\r\n\t\tif( !this.isPending ) return false;\r\n\t\tsuper.notify( param );\r\n\t\tthis._resolve( param );\r\n\t\treturn true;\r\n\t}\r\n\r\n\tpublic fail( error?: any ) {\r\n\t\tif( !this.isPending ) return false;\r\n\t\tthis._reject( error );\r\n\t\treturn false;\r\n\t}\r\n\r\n\tpublic then<U>( onFulfilled?: (value: T) => PromiseLike<U>, onRejected?: (error: any) => PromiseLike<U> ): PromiseLike<U>;\r\n\tpublic then<U>( onFulfilled?: (value: T) => PromiseLike<U>, onRejected?: (error: any) => U ): PromiseLike<U>;\r\n\tpublic then<U>( onFulfilled?: (value: T) => PromiseLike<U>, onRejected?: (error: any) => void ): PromiseLike<U>;\r\n\tpublic then<U>( onFulfilled?: (value: T) => U, onRejected?: (error: any) => PromiseLike<U> ): PromiseLike<U>;\r\n\tpublic then<U>( onFulfilled?: (value: T) => U, onRejected?: (error: any) => U ): PromiseLike<U>;\r\n\tpublic then<U>( onFulfilled?: (value: T) => U, onRejected?: (error: any) => void ): PromiseLike<U>;\r\n\tpublic then<U>( onFulfilled: any, onRejected?: any ) {\r\n\t\treturn Promise.resolve( this._promiselike ).then<U>( onFulfilled, onRejected );\r\n\t}\r\n\r\n\tprivate _promiselike: PromiseLike<T>;\r\n\tprivate _resolve: ( value: T ) => void;\r\n\tprivate _reject: ( error: T ) => void;\r\n\r\n\tprivate _isResolved = false;\r\n\tprivate _isRejected = false;\r\n\r\n\tpublic get isResolved() {\r\n\t\treturn this._isResolved;\r\n\t}\r\n\r\n\tpublic get isRejected() {\r\n\t\treturn this._isRejected;\r\n\t}\r\n\r\n\tpublic get isPending() {\r\n\t\treturn !(this.isResolved || this.isRejected);\r\n\t}\r\n\r\n\tprivate _hasFired = false;\r\n\tprivate _hasFailed = false;\r\n}\r\n\r\nexport class ObservableValue<T> extends Observable<T> implements IObservableValue<T> {\r\n\tconstructor( initialValue?: T ) {\r\n\t\tsuper();\r\n\t\tthis._value = initialValue;\r\n\t}\r\n\r\n\tprivate _value: T;\r\n\r\n\tpublic get value() { return this._value; }\r\n\tpublic set value( value: T ) {\r\n\t\tif( this._value !== value ) {\r\n\t\t\tthis._value = value;\r\n\t\t\tthis.onChange( value );\r\n\t\t}\r\n\t}\r\n\r\n\tprotected onChange( value: T ) {\r\n\t\tthis.notify( value );\r\n\t}\r\n\r\n\tpublic valueOf() {\r\n\t\tconst { value } = this;\r\n\t\tif( value === null || value === undefined ) return value;\r\n\t\telse return value.valueOf() as T;\r\n\t}\r\n\r\n\tpublic toString() {\r\n\t\tconst { value } = this;\r\n\t\tif( value === null || value === undefined ) return ({}).toString.call( value );\r\n\t\telse return value.toString();\r\n\t}\r\n}\r\n"]}