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arraytype.go
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/
arraytype.go
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// Copyright 2020-2021 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 sql
import (
"encoding/json"
"fmt"
"io"
"github.com/dolthub/vitess/go/sqltypes"
"github.com/dolthub/vitess/go/vt/proto/query"
)
type arrayType struct {
underlying Type
}
// CreateArray returns a new CreateArray type of the given underlying type.
func CreateArray(underlying Type) Type {
return arrayType{underlying}
}
func (t arrayType) Compare(a, b interface{}) (int, error) {
a, err := t.Convert(a)
if err != nil {
return 0, err
}
b, err = t.Convert(b)
if err != nil {
return 0, err
}
left := a.([]interface{})
right := b.([]interface{})
if len(left) < len(right) {
return -1, nil
} else if len(left) > len(right) {
return 1, nil
}
for i := range left {
cmp, err := t.underlying.Compare(left[i], right[i])
if err != nil {
return 0, err
}
if cmp != 0 {
return cmp, nil
}
}
return 0, nil
}
func (t arrayType) Convert(v interface{}) (interface{}, error) {
switch v := v.(type) {
case []interface{}:
var result = make([]interface{}, len(v))
for i, v := range v {
var err error
result[i], err = t.underlying.Convert(v)
if err != nil {
return nil, err
}
}
return result, nil
case Generator:
var values []interface{}
for {
val, err := v.Next()
if err != nil {
if err == io.EOF {
break
}
return nil, err
}
val, err = t.underlying.Convert(val)
if err != nil {
return nil, err
}
values = append(values, val)
}
if err := v.Close(); err != nil {
return nil, err
}
return values, nil
default:
return nil, ErrNotArray.New(v)
}
}
func (t arrayType) MustConvert(v interface{}) interface{} {
value, err := t.Convert(v)
if err != nil {
panic(err)
}
return value
}
func (t arrayType) Promote() Type {
return t
}
func (t arrayType) SQL(v interface{}) (sqltypes.Value, error) {
if v == nil {
return sqltypes.NULL, nil
}
v, err := convertForJSON(t, v)
if err != nil {
return sqltypes.Value{}, err
}
var val []byte
js, ok := v.(JSONValue)
if ok {
// todo: making a context here is expensive
s, err := js.ToString(NewEmptyContext())
if err != nil {
return sqltypes.Value{}, err
}
val = []byte(s)
} else {
val, err = json.Marshal(v)
if err != nil {
return sqltypes.Value{}, err
}
}
return sqltypes.MakeTrusted(sqltypes.TypeJSON, val), nil
}
func (t arrayType) String() string {
return fmt.Sprintf("ARRAY(%s)", t.underlying)
}
func (t arrayType) Type() query.Type {
return sqltypes.TypeJSON
}
func (t arrayType) Zero() interface{} {
return nil
}