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/*
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Copyright 2020 The Qmgo Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package qmgo
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import (
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"math"
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"strconv"
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"strings"
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"time"
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"go.mongodb.org/mongo-driver/bson/primitive"
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)
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// Now return Millisecond current time
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func Now() time.Time {
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return time.Unix(0, time.Now().UnixNano()/1e6*1e6)
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}
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// NewObjectID generates a new ObjectID.
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// Watch out: the way it generates objectID is different from mgo
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func NewObjectID() primitive.ObjectID {
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return primitive.NewObjectID()
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}
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// SplitSortField handle sort symbol: "+"/"-" in front of field
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// if "+"， return sort as 1
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// if "-"， return sort as -1
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func SplitSortField(field string) (key string, sort int32) {
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sort = 1
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key = field
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if len(field) != 0 {
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switch field[0] {
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case '+':
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key = strings.TrimPrefix(field, "+")
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sort = 1
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case '-':
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key = strings.TrimPrefix(field, "-")
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sort = -1
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}
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}
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return key, sort
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}
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// CompareVersions compares two version number strings (i.e. positive integers separated by
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// periods). Comparisons are done to the lesser precision of the two versions. For example, 3.2 is
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// considered equal to 3.2.11, whereas 3.2.0 is considered less than 3.2.11.
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//
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// Returns a positive int if version1 is greater than version2, a negative int if version1 is less
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// than version2, and 0 if version1 is equal to version2.
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func CompareVersions(v1 string, v2 string) (int, error) {
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n1 := strings.Split(v1, ".")
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n2 := strings.Split(v2, ".")
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for i := 0; i < int(math.Min(float64(len(n1)), float64(len(n2)))); i++ {
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i1, err := strconv.Atoi(n1[i])
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if err != nil {
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return 0, err
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}
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i2, err := strconv.Atoi(n2[i])
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if err != nil {
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return 0, err
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}
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difference := i1 - i2
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if difference != 0 {
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return difference, nil
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}
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}
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return 0, nil
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}
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