/
string.go
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/
string.go
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// Copyright 2017 Google Inc.
//
// 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 metrics
import "errors"
// String implements a value type with string storage.
// It satisfies the Value interface.
type String struct {
s string
}
// NewString returns a new String with the given string value.
func NewString(s string) String {
return String{s: s}
}
// Add isn't supported for the String type, this is only to satisfy the Value
// interface.
func (s String) Add(val Value) error {
return errors.New("string value type doesn't support Add() operation")
}
// AddInt64 generates a panic for the String type. This is added only to satisfy
// the Value interface.
func (s String) AddInt64(i int64) {
panic("String type doesn't implement AddInt64()")
}
// AddFloat64 generates a panic for the String type. This is added only to
// satisfy the Value interface.
func (s String) AddFloat64(f float64) {
panic("String type doesn't implement AddFloat64()")
}
// String simply returns the stored string.
func (s String) String() string {
return "\"" + s.s + "\""
}
// Clone returns the copy of receiver String.
func (s String) Clone() Value {
return String{s: s.s}
}