37 lines
1.5 KiB
Go
37 lines
1.5 KiB
Go
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// Copyright (c) 2016 Arista Networks, Inc.
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// Use of this source code is governed by the Apache License 2.0
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// that can be found in the COPYING file.
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// Package value defines an interface for user-defined types with value
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// semantics to implement in order to be compatible with the rest of the
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// Arista Go infrastructure.
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package value
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import (
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"encoding/json"
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"fmt"
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)
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// Value is the interface that all types with value semantics must implement
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// in order to be compatible with the Entity infrastructure and streaming
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// protocols we support. By default all value types are just represented as
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// a map[string]interface{}, but when a TypeMapper is used to remap the value
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// to a user-defined type (as opposed to a built-in type), then these user
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// defined types must fulfill the contract defined by this interface.
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//
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// Types that implement this interface must have value semantics, meaning they
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// are not allowed to contain anything with pointer semantics such as slices,
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// maps, channels, etc. They must be directly usable as keys in maps and
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// behave properly when compared with the built-in == operator.
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type Value interface {
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fmt.Stringer
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json.Marshaler
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// ToBuiltin returns the best possible representation of this type as one
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// of the built-in types we support. Most often this means returning the
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// string representation of this type (for example for an IP address or an
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// IP prefix), but sometimes not (e.g. a VLAN ID is better represented as
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// uint16).
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ToBuiltin() interface{}
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}
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