/**
 * 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 * as defaultLogger from '../common/console-logger' ; import * as loggerTypes from '../common/types' ; import { Bucket } from './types' ; export class BucketBoundaries { readonly buckets : Bucket [ ] ; readonly bucketCounts : number [ ] ; /** An object to log information to */ private logger : loggerTypes . Logger ; constructor ( boundaries , logger = defaultLogger ) { this . logger = logger . logger ( ) ; this . buckets = this . dropNegativeBucketBounds ( boundaries ) ; this . bucketCounts = this . getBucketCounts ( this . buckets ) ; } /**
     * Gets bucket boundaries
     */ getBoundaries ( ) { return this . buckets ; } /**
     * Gets initial bucket counts
     */ getCounts ( ) { return this . bucketCounts ; } param bucketBoundaries private dropNegativeBucketBounds ( bucketBoundaries ) { let negative = 0 ; if ( ! bucketBoundaries ) return [ ] ; const result = bucketBoundaries . reduce ( ( accumulator , boundary , index ) => { if ( boundary > 0 ) { const nextBoundary = bucketBoundaries [ index + 1 ] ; this . validateBoundary ( boundary , nextBoundary ) ; accumulator . push ( boundary ) ; } else { negative ++ ; } return accumulator ; } , [ ] ) ; if ( negative ) { this . logger . warn ( `Dropping ${ negative } negative bucket boundaries, the values must be strictly > 0.` ) ; } return result ; } param buckets private getBucketCounts ( buckets ) { if ( ! buckets ) return [ ] ; const bucketsCount = new Array ( buckets . length + 1 ) ; bucketsCount . fill ( 0 ) ; return bucketsCount ; } param current param next private validateBoundary ( current , next ) { if ( next ) { if ( current > next ) { this . logger . error ( 'Bucket boundaries not sorted.' ) ; } if ( current === next ) { this . logger . error ( 'Bucket boundaries not unique.' ) ; } } } }