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/******************************************************************************
*
* Copyright 2018 Stefan Majewsky <majewsky@gmx.net>
*
* 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 schwift
import (
"strconv"
)
//FieldUint64 is a helper type that provides type-safe access to a Swift header
//whose value is an unsigned integer. It cannot be directly constructed, but
//methods on the Headers types return this type. For example:
//
// hdr := NewAccountHeaders()
// //the following two statements are equivalent:
// hdr["X-Account-Meta-Quota-Bytes"] = "1048576"
// hdr.BytesUsedQuota().Set(1 << 20)
type FieldUint64 struct {
h Headers
k string
}
//Exists checks whether there is a value for this header.
func (f FieldUint64) Exists() bool {
return f.h.Get(f.k) != ""
}
//Get returns the value for this header, or 0 if there is no value (or if it is
//not a valid uint64).
func (f FieldUint64) Get() uint64 {
v, err := strconv.ParseUint(f.h.Get(f.k), 10, 64)
if err != nil {
return 0
}
return v
}
//Set writes a new value for this header into the corresponding headers
//instance.
func (f FieldUint64) Set(value uint64) {
f.h.Set(f.k, strconv.FormatUint(value, 10))
}
//Del removes this key from the original headers instance, so that the key will
//remain unchanged on the server during Update().
func (f FieldUint64) Del() {
f.h.Del(f.k)
}
//Clear sets this key to an empty string in the original headers instance, so
//that the key will be removed on the server during Update().
func (f FieldUint64) Clear() {
f.h.Clear(f.k)
}
func (f FieldUint64) validate() error {
val := f.h.Get(f.k)
if val == "" {
return nil
}
_, err := strconv.ParseUint(val, 10, 64)
if err == nil {
return nil
}
return MalformedHeaderError{f.k, err}
}
////////////////////////////////////////////////////////////////////////////////
//FieldUint64Readonly is a readonly variant of FieldUint64. It is used for
//fields that cannot be set by the client.
type FieldUint64Readonly struct {
h Headers
k string
}
//Exists checks whether there is a value for this header.
func (f FieldUint64Readonly) Exists() bool {
return f.h.Get(f.k) != ""
}
//Get returns the value for this header, or 0 if there is no value (or if it is
//not a valid uint64).
func (f FieldUint64Readonly) Get() uint64 {
return FieldUint64{f.h, f.k}.Get()
}
func (f FieldUint64Readonly) validate() error {
return FieldUint64{f.h, f.k}.validate()
}
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