/**
 * Copyright 2018, OpenCensus Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ import { LabelValue } from './export/types' ; import { LengthAttributeInterface , LengthMethodInterface , SizeAttributeInterface , SizeMethodInterface , ToValueInterface , } from './types' ; const COMMA_SEPARATOR = ',' ; const UNSET_LABEL_VALUE = { value : null , } ; param labelValues returns export function hashLabelValues ( labelValues ) { return labelValues . map ( lv => lv . value ) . sort ( ) . join ( COMMA_SEPARATOR ) ; } param count returns export function initializeDefaultLabels ( count ) { return new Array ( count ) . fill ( UNSET_LABEL_VALUE ) ; } export function isLengthAttributeInterface ( obj ) { return obj && typeof obj . length === 'number' ; } export function isLengthMethodInterface ( obj ) { return obj && typeof obj . length === 'function' ; } export function isSizeAttributeInterface ( obj ) { return obj && typeof obj . size === 'number' ; } export function isSizeMethodInterface ( obj ) { return obj && typeof obj . size === 'function' ; } export function isToValueInterface ( obj ) { return obj && typeof obj . getValue === 'function' ; }