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//
// Copyright 2020-2022 Sean C Foley
//
// 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 ipaddr
import (
"sync"
"github.com/seancfoley/ipaddress-go/ipaddr/addrerr"
"github.com/seancfoley/ipaddress-go/ipaddr/addrstrparam"
)
type macAddressProvider interface {
getAddress() (*MACAddress, addrerr.IncompatibleAddressError)
// If the address was created by parsing, this provides the parameters used when creating the address,
// otherwise nil
getParameters() addrstrparam.MACAddressStringParams
}
type macAddressNullProvider struct {
validationOptions addrstrparam.MACAddressStringParams
}
var invalidMACProvider = macAddressEmptyProvider{macAddressNullProvider{defaultMACAddrParameters}}
func (provider macAddressNullProvider) getParameters() addrstrparam.MACAddressStringParams {
return provider.validationOptions
}
func (provider macAddressNullProvider) getAddress() (*MACAddress, addrerr.IncompatibleAddressError) {
return nil, nil
}
type macAddressEmptyProvider struct {
macAddressNullProvider
}
var defaultMACAddressEmptyProvider = macAddressEmptyProvider{macAddressNullProvider{defaultMACAddrParameters}}
type macAddressAllProvider struct {
validationOptions addrstrparam.MACAddressStringParams
address *MACAddress
creationLock *sync.Mutex
}
func (provider *macAddressAllProvider) getParameters() addrstrparam.MACAddressStringParams {
return provider.validationOptions
}
func (provider *macAddressAllProvider) getAddress() (*MACAddress, addrerr.IncompatibleAddressError) {
addr := provider.address
if addr == nil {
provider.creationLock.Lock()
addr = provider.address
if addr == nil {
validationOptions := provider.validationOptions
size := validationOptions.GetPreferredLen()
creator := macType.getNetwork().getAddressCreator()
var segCount int
if size == addrstrparam.EUI64Len {
segCount = ExtendedUniqueIdentifier64SegmentCount
} else {
segCount = MediaAccessControlSegmentCount
}
allRangeSegment := creator.createRangeSegment(0, MACMaxValuePerSegment)
segments := make([]*AddressDivision, segCount)
for i := range segments {
segments[i] = allRangeSegment
}
section := creator.createSectionInternal(segments, true)
addr = creator.createAddressInternal(section.ToSectionBase(), nil).ToMAC()
}
provider.creationLock.Unlock()
}
return addr, nil
}
var macAddressDefaultAllProvider = &macAddressAllProvider{validationOptions: defaultMACAddrParameters, creationLock: &sync.Mutex{}}
type wrappedMACAddressProvider struct {
address *MACAddress
}
func (provider wrappedMACAddressProvider) getParameters() addrstrparam.MACAddressStringParams {
return nil
}
func (provider wrappedMACAddressProvider) getAddress() (*MACAddress, addrerr.IncompatibleAddressError) {
return provider.address, nil
}
var (
_, _, _ macAddressProvider = macAddressEmptyProvider{},
&macAddressAllProvider{},
&wrappedMACAddressProvider{}
)
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