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util.go
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util.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package collection
import (
"encoding/binary"
"encoding/hex"
)
// UUIDHashCode is a hash function for hashing string uuid
// if the uuid is malformed, then the hash function always
// returns 0 as the hash value
func UUIDHashCode(input interface{}) uint32 {
key, ok := input.(string)
if !ok {
return 0
}
if len(key) != UUIDStringLength {
return 0
}
// Use the first 4 bytes of the uuid as the hash
b, err := hex.DecodeString(key[:8])
if err != nil {
return 0
}
return binary.BigEndian.Uint32(b)
}
// MinInt returns the min of given two integers
func MinInt(a, b int) int {
if a > b {
return b
}
return a
}
// MaxInt returns the max of given two integers
func MaxInt(a, b int) int {
if a > b {
return a
}
return b
}
// MinInt64 returns the min of given two integers
func MinInt64(a, b int64) int64 {
if a > b {
return b
}
return a
}
// MaxInt64 returns the max of given two integers
func MaxInt64(a, b int64) int64 {
if a > b {
return a
}
return b
}