/*
 * 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 org.apache.flink.connectors.hive.write;

import org.apache.flink.configuration.Configuration;
import org.apache.flink.connector.file.table.OutputFormatFactory;
import org.apache.flink.core.fs.Path;
import org.apache.flink.runtime.fs.hdfs.HadoopFileSystem;
import org.apache.flink.types.Row;

import org.apache.hadoop.hive.ql.exec.FileSinkOperator.RecordWriter;
import org.apache.hadoop.io.Writable;

import java.io.IOException;
import java.util.function.Function;

/** Hive {@link OutputFormatFactory}, use {@link RecordWriter} to write record. */
public class HiveOutputFormatFactory implements OutputFormatFactory<Row> {

    private static final long serialVersionUID = 2L;

    private final HiveWriterFactory factory;

    public HiveOutputFormatFactory(HiveWriterFactory factory) {
        this.factory = factory;
    }

    @Override
    public HiveOutputFormat createOutputFormat(Path path) {
        return new HiveOutputFormat(
                factory.createRecordWriter(HadoopFileSystem.toHadoopPath(path)),
                factory.createRowConverter());
    }

    private class HiveOutputFormat implements org.apache.flink.api.common.io.OutputFormat<Row> {

        private final RecordWriter recordWriter;
        private final Function<Row, Writable> rowConverter;

        private HiveOutputFormat(RecordWriter recordWriter, Function<Row, Writable> rowConverter) {
            this.recordWriter = recordWriter;
            this.rowConverter = rowConverter;
        }

        @Override
        public void configure(Configuration parameters) {}

        @Override
        public void open(InitializationContext context) {}

        @Override
        public void writeRecord(Row record) throws IOException {
            recordWriter.write(rowConverter.apply(record));
        }

        @Override
        public void close() throws IOException {
            recordWriter.close(false);
        }
    }
}
