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// Copyright 2019 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package schemas
import (
"fmt"
"strings"
)
// enumerate all index types
const (
IndexType = iota + 1
UniqueType
)
// Index represents a database index
type Index struct {
IsRegular bool
Name string
Type int
Cols []string
}
// NewIndex new an index object
func NewIndex(name string, indexType int) *Index {
return &Index{true, name, indexType, make([]string, 0)}
}
// XName returns the special index name for the table
func (index *Index) XName(tableName string) string {
if !strings.HasPrefix(index.Name, "UQE_") &&
!strings.HasPrefix(index.Name, "IDX_") {
tableParts := strings.Split(strings.Replace(tableName, `"`, "", -1), ".")
tableName = tableParts[len(tableParts)-1]
if index.Type == UniqueType {
return fmt.Sprintf("UQE_%v_%v", tableName, index.Name)
}
return fmt.Sprintf("IDX_%v_%v", tableName, index.Name)
}
return index.Name
}
// AddColumn add columns which will be composite index
func (index *Index) AddColumn(cols ...string) {
index.Cols = append(index.Cols, cols...)
}
// Equal return true if the two Index is equal
func (index *Index) Equal(dst *Index) bool {
if index.Type != dst.Type {
return false
}
if len(index.Cols) != len(dst.Cols) {
return false
}
for i := 0; i < len(index.Cols); i++ {
var found bool
for j := 0; j < len(dst.Cols); j++ {
if index.Cols[i] == dst.Cols[j] {
found = true
break
}
}
if !found {
return false
}
}
return true
}