/
foreign_key_collection.go
77 lines (68 loc) · 2.08 KB
/
foreign_key_collection.go
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// Copyright 2022 Dolthub, 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 memory
import (
"strings"
"github.com/dolthub/go-mysql-server/sql"
)
// ForeignKeyCollection is a shareable container for a collection of foreign keys.
type ForeignKeyCollection struct {
fks []sql.ForeignKeyConstraint
}
// newForeignKeyCollection returns a new ForeignKeyCollection.
func newForeignKeyCollection() *ForeignKeyCollection {
return &ForeignKeyCollection{}
}
// AddFK adds the given foreign key to the internal slice.
func (fkc *ForeignKeyCollection) AddFK(fk sql.ForeignKeyConstraint) {
if fkc == nil {
return
}
fkc.fks = append(fkc.fks, fk)
}
// DropFK removes the given foreign key from the internal slice. Returns true if the foreign key was found.
func (fkc *ForeignKeyCollection) DropFK(fkName string) bool {
if fkc == nil {
return false
}
fkLowerName := strings.ToLower(fkName)
for i, existingFk := range fkc.fks {
if fkLowerName == strings.ToLower(existingFk.Name) {
fkc.fks = append(fkc.fks[:i], fkc.fks[i+1:]...)
return true
}
}
return false
}
// SetResolved sets the given foreign key as being resolved.
func (fkc *ForeignKeyCollection) SetResolved(fkName string) bool {
if fkc == nil {
return false
}
fkLowerName := strings.ToLower(fkName)
for i, existingFk := range fkc.fks {
if fkLowerName == strings.ToLower(existingFk.Name) {
fkc.fks[i].IsResolved = true
return true
}
}
return false
}
// Keys returns all of the foreign keys.
func (fkc *ForeignKeyCollection) Keys() []sql.ForeignKeyConstraint {
if fkc == nil {
return nil
}
return fkc.fks
}