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109 lines
2.5 KiB
109 lines
2.5 KiB
//
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// DISCLAIMER
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//
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// Copyright 2017 ArangoDB GmbH, Cologne, Germany
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// Copyright holder is ArangoDB GmbH, Cologne, Germany
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//
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// Author Ewout Prangsma
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//
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package driver
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import (
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"strconv"
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"strings"
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)
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// Version holds a server version string. The string has the format "major.minor.sub".
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// Major and minor will be numeric, and sub may contain a number or a textual version.
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type Version string
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// Major returns the major part of the version
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// E.g. "3.1.7" -> 3
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func (v Version) Major() int {
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parts := strings.Split(string(v), ".")
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result, _ := strconv.Atoi(parts[0])
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return result
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}
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// Minor returns the minor part of the version.
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// E.g. "3.1.7" -> 1
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func (v Version) Minor() int {
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parts := strings.Split(string(v), ".")
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if len(parts) >= 2 {
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result, _ := strconv.Atoi(parts[1])
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return result
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}
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return 0
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}
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// Sub returns the sub part of the version.
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// E.g. "3.1.7" -> "7"
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func (v Version) Sub() string {
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parts := strings.SplitN(string(v), ".", 3)
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if len(parts) == 3 {
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return parts[2]
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}
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return ""
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}
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// SubInt returns the sub part of the version as integer.
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// The bool return value indicates if the sub part is indeed a number.
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// E.g. "3.1.7" -> 7, true
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// E.g. "3.1.foo" -> 0, false
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func (v Version) SubInt() (int, bool) {
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result, err := strconv.Atoi(v.Sub())
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return result, err == nil
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}
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// CompareTo returns an integer comparing two version.
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// The result will be 0 if v==other, -1 if v < other, and +1 if v > other.
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// If major & minor parts are equal and sub part is not a number,
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// the sub part will be compared using lexicographical string comparison.
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func (v Version) CompareTo(other Version) int {
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a := v.Major()
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b := other.Major()
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if a < b {
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return -1
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}
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if a > b {
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return 1
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}
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a = v.Minor()
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b = other.Minor()
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if a < b {
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return -1
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}
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if a > b {
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return 1
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}
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a, aIsInt := v.SubInt()
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b, bIsInt := other.SubInt()
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if !aIsInt || !bIsInt {
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// Do a string comparison
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return strings.Compare(v.Sub(), other.Sub())
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}
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if a < b {
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return -1
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}
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if a > b {
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return 1
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}
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return 0
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}
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