wehub-resource-sync
87 lines
2.5 KiB
Go
87 lines
2.5 KiB
Go
// Copyright 2019 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 schema
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/dolthub/dolt/go/store/types"
|
|
)
|
|
|
|
// ColConstraint is an interface used for evaluating whether a columns value is valid
|
|
// TODO: there is only a single constraint type: NotNull. It should probably just be a bool field on the column.
|
|
type ColConstraint interface {
|
|
// GetConstraintType returns a string representation of the type of constraint. This is used for serialization and
|
|
// deserialization of constraints (see ColConstraintFromTypeAndParams).
|
|
GetConstraintType() string
|
|
|
|
// Stringer results are used to inform users of the constraint's properties.
|
|
fmt.Stringer
|
|
}
|
|
|
|
const (
|
|
NotNullConstraintType = "not_null"
|
|
)
|
|
|
|
// NotNullConstraint validates that a value is not null. It does not restrict 0 length strings, or 0 valued ints, or
|
|
// anything other than non nil values
|
|
type NotNullConstraint struct{}
|
|
|
|
// SatisfiesConstraint returns true if value is not nil and not types.NullValue
|
|
func (nnc NotNullConstraint) SatisfiesConstraint(value types.Value) bool {
|
|
return !types.IsNull(value)
|
|
}
|
|
|
|
// GetConstraintType returns "not_null"
|
|
func (nnc NotNullConstraint) GetConstraintType() string {
|
|
return NotNullConstraintType
|
|
}
|
|
|
|
// String returns a useful description of the constraint
|
|
func (nnc NotNullConstraint) String() string {
|
|
return "Not null"
|
|
}
|
|
|
|
// IndexOfConstraint returns the index in the supplied slice of the first constraint of matching type. If none are
|
|
// found then -1 is returned
|
|
func IndexOfConstraint(constraints []ColConstraint, constraintType string) int {
|
|
for i, c := range constraints {
|
|
if c.GetConstraintType() == constraintType {
|
|
return i
|
|
}
|
|
}
|
|
|
|
return -1
|
|
}
|
|
|
|
// ColConstraintsAreEqual validates two ColConstraint slices are identical.
|
|
func ColConstraintsAreEqual(a, b []ColConstraint) bool {
|
|
if len(a) != len(b) {
|
|
return false
|
|
} else if len(a) == 0 {
|
|
return true
|
|
}
|
|
|
|
for i := 0; i < len(a); i++ {
|
|
ca, cb := a[i], b[i]
|
|
|
|
if ca.GetConstraintType() != cb.GetConstraintType() {
|
|
return false
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|