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1c7b0fea16
A common helper function is used for UUID.String(), UUID.URN(), and UUID.MarshalJSON(). Any perforance hit in UUID.String() and UUID.Marshal() appears to be negligable. The benefit to UUID.MarshalJSON() is several hundred nanoseconds (23% faster) and 2 allocations (21% fewer bytes). Some redundant checks are removed from UUID.UnmarshalJSON() method. The "encoding/json".Unmarshaler interface specifies that implementations can assume input is valid JSON content. This allows one to assume that (1) input is not empty and (2) if index 0 is a quote, then the content is a json string and the last index will contain a terminating quote. The second point is not completely explicit in the documentation but it is true in practice (and it is safe to assume -- errors will be caught).
35 lines
673 B
Go
35 lines
673 B
Go
// Copyright 2014 Google Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package uuid
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import "errors"
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func (u UUID) MarshalJSON() ([]byte, error) {
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if len(u) != 16 {
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return []byte(`""`), nil
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}
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var js [38]byte
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js[0] = '"'
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encodeHex(js[1:], u)
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js[37] = '"'
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return js[:], nil
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}
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func (u *UUID) UnmarshalJSON(data []byte) error {
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if string(data) == `""` {
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return nil
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}
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if data[0] != '"' {
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return errors.New("invalid UUID format")
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}
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data = data[1 : len(data)-1]
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uu := Parse(string(data))
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if uu == nil {
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return errors.New("invalid UUID format")
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}
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*u = uu
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return nil
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}
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