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// Copyright 2015 The appc 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.
package types
import (
"encoding/json"
"github.com/coreos/go-semver/semver"
)
var (
ErrNoZeroSemVer = ACVersionError("SemVer cannot be zero")
ErrBadSemVer = ACVersionError("SemVer is bad")
)
// SemVer implements the Unmarshaler interface to define a field that must be
// a semantic version string
// TODO(jonboulle): extend upstream instead of wrapping?
type SemVer semver.Version
// NewSemVer generates a new SemVer from a string. If the given string does
// not represent a valid SemVer, nil and an error are returned.
func NewSemVer(s string) (*SemVer, error) {
nsv, err := semver.NewVersion(s)
if err != nil {
return nil, ErrBadSemVer
}
v := SemVer(*nsv)
if v.Empty() {
return nil, ErrNoZeroSemVer
}
return &v, nil
}
func (sv SemVer) LessThanMajor(versionB SemVer) bool {
majorA := semver.Version(sv).Major
majorB := semver.Version(versionB).Major
if majorA < majorB {
return true
}
return false
}
func (sv SemVer) LessThanExact(versionB SemVer) bool {
vA := semver.Version(sv)
vB := semver.Version(versionB)
return vA.LessThan(vB)
}
func (sv SemVer) String() string {
s := semver.Version(sv)
return s.String()
}
func (sv SemVer) Empty() bool {
return semver.Version(sv) == semver.Version{}
}
// UnmarshalJSON implements the json.Unmarshaler interface
func (sv *SemVer) UnmarshalJSON(data []byte) error {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return err
}
v, err := NewSemVer(s)
if err != nil {
return err
}
*sv = *v
return nil
}
// MarshalJSON implements the json.Marshaler interface
func (sv SemVer) MarshalJSON() ([]byte, error) {
if sv.Empty() {
return nil, ErrNoZeroSemVer
}
return json.Marshal(sv.String())
}
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