mirror of https://github.com/go-gitea/gitea.git
48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
|
// Copyright 2015 PingCAP, 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,
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
package distinct
|
||
|
|
|
||
|
|
import (
|
||
|
|
"github.com/juju/errors"
|
||
|
|
"github.com/pingcap/tidb/util/codec"
|
||
|
|
"github.com/pingcap/tidb/util/types"
|
||
|
|
)
|
||
|
|
|
||
|
|
// CreateDistinctChecker creates a new distinct checker.
|
||
|
|
func CreateDistinctChecker() *Checker {
|
||
|
|
return &Checker{
|
||
|
|
existingKeys: make(map[string]bool),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Checker stores existing keys and checks if given data is distinct.
|
||
|
|
type Checker struct {
|
||
|
|
existingKeys map[string]bool
|
||
|
|
}
|
||
|
|
|
||
|
|
// Check checks if values is distinct.
|
||
|
|
func (d *Checker) Check(values []interface{}) (bool, error) {
|
||
|
|
bs, err := codec.EncodeValue([]byte{}, types.MakeDatums(values...)...)
|
||
|
|
if err != nil {
|
||
|
|
return false, errors.Trace(err)
|
||
|
|
}
|
||
|
|
key := string(bs)
|
||
|
|
_, ok := d.existingKeys[key]
|
||
|
|
if ok {
|
||
|
|
return false, nil
|
||
|
|
}
|
||
|
|
d.existingKeys[key] = true
|
||
|
|
return true, nil
|
||
|
|
}
|