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// Copyright 2018 Google Inc. All Rights Reserved.
// This file is available under the Apache license.
package datum
import (
"encoding/json"
"sync"
"sync/atomic"
"time"
)
// String describes a string value at a given timestamp.
type String struct {
BaseDatum
mu sync.RWMutex
Value string
}
// Set sets the value of the String to the value at timestamp.
func (d *String) Set(value string, timestamp time.Time) {
d.mu.Lock()
d.Value = value
d.stamp(timestamp)
d.mu.Unlock()
}
// Get returns the value of the String.
func (d *String) Get() string {
d.mu.RLock()
defer d.mu.RUnlock()
return d.Value
}
// ValueString returns the value of the String as a string.
func (d *String) ValueString() string {
return d.Get()
}
// MarshalJSON returns a JSON encoding of the String.
func (d *String) MarshalJSON() ([]byte, error) {
j := struct {
Value string
Time int64
}{d.Get(), atomic.LoadInt64(&d.Time)}
return json.Marshal(j)
}
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