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json_reader.go
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json_reader.go
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// Copyright 2018 StreamSets 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 jsonrecord
import (
"encoding/json"
"github.com/streamsets/datacollector-edge/api"
"github.com/streamsets/datacollector-edge/api/dataformats"
"github.com/streamsets/datacollector-edge/container/common"
"github.com/streamsets/datacollector-edge/container/recordio"
"io"
)
type JsonReaderFactoryImpl struct {
recordio.AbstractRecordReaderFactory
// TODO: Add needed configs
}
func (j *JsonReaderFactoryImpl) CreateReader(
context api.StageContext,
reader io.Reader,
messageId string,
) (dataformats.RecordReader, error) {
var recordReader dataformats.RecordReader
recordReader = newRecordReader(context, reader, messageId)
return recordReader, nil
}
type JsonReaderImpl struct {
context api.StageContext
reader io.Reader
decoder *json.Decoder
messageId string
counter int
}
func (jsonReader *JsonReaderImpl) ReadRecord() (api.Record, error) {
var f interface{}
err := jsonReader.decoder.Decode(&f)
if err != nil {
if err == io.EOF {
return nil, nil
}
return nil, err
}
jsonReader.counter++
sourceId := common.CreateRecordId(jsonReader.messageId, jsonReader.counter)
return jsonReader.context.CreateRecord(sourceId, f)
}
func (jsonReader *JsonReaderImpl) Close() error {
return recordio.Close(jsonReader.reader)
}
func newRecordReader(context api.StageContext, reader io.Reader, messageId string) *JsonReaderImpl {
return &JsonReaderImpl{
context: context,
reader: reader,
decoder: json.NewDecoder(reader),
messageId: messageId,
counter: 0,
}
}