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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 extensions
import (
"encoding/json"
"fmt"
"reflect"
"unsafe"
"github.com/apache/arrow-go/v18/arrow"
"github.com/apache/arrow-go/v18/arrow/array"
)
// OpaqueType is a placeholder for a type from an external (usually
// non-Arrow) system that could not be interpreted.
type OpaqueType struct {
arrow.ExtensionBase `json:"-"`
TypeName string `json:"type_name"`
VendorName string `json:"vendor_name"`
}
// NewOpaqueType creates a new OpaqueType with the provided storage type, type name, and vendor name.
func NewOpaqueType(storageType arrow.DataType, name, vendorName string) *OpaqueType {
return &OpaqueType{ExtensionBase: arrow.ExtensionBase{Storage: storageType},
TypeName: name, VendorName: vendorName}
}
func (*OpaqueType) ArrayType() reflect.Type {
return reflect.TypeOf(OpaqueArray{})
}
func (*OpaqueType) ExtensionName() string {
return "arrow.opaque"
}
func (o *OpaqueType) String() string {
return fmt.Sprintf("extension<%s[storage_type=%s, type_name=%s, vendor_name=%s]>",
o.ExtensionName(), o.Storage, o.TypeName, o.VendorName)
}
func (o *OpaqueType) Serialize() string {
data, _ := json.Marshal(o)
return string(data)
}
func (*OpaqueType) Deserialize(storageType arrow.DataType, data string) (arrow.ExtensionType, error) {
var out OpaqueType
err := json.Unmarshal(unsafe.Slice(unsafe.StringData(data), len(data)), &out)
if err != nil {
return nil, err
}
switch {
case out.TypeName == "":
return nil, fmt.Errorf("%w: serialized JSON data for OpaqueType missing type_name",
arrow.ErrInvalid)
case out.VendorName == "":
return nil, fmt.Errorf("%w: serialized JSON data for OpaqueType missing vendor_name",
arrow.ErrInvalid)
}
out.ExtensionBase = arrow.ExtensionBase{Storage: storageType}
return &out, nil
}
func (o *OpaqueType) ExtensionEquals(other arrow.ExtensionType) bool {
if o.ExtensionName() != other.ExtensionName() {
return false
}
rhs, ok := other.(*OpaqueType)
if !ok {
return false
}
return arrow.TypeEqual(o.Storage, rhs.Storage) &&
o.TypeName == rhs.TypeName &&
o.VendorName == rhs.VendorName
}
// OpaqueArray is a placeholder for data from an external (usually
// non-Arrow) system that could not be interpreted.
type OpaqueArray struct {
array.ExtensionArrayBase
}
var (
_ arrow.ExtensionType = (*OpaqueType)(nil)
_ array.ExtensionArray = (*OpaqueArray)(nil)
)
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