/**
* Copyright (C) 2013-2018 Klarna AB
*
* 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 com.klarna.hiverunner.data;
import java.io.File;
import java.util.List;
import org.apache.hive.hcatalog.data.schema.HCatSchema;
/**
* A {@link File} parsing class to be used with {@link InsertIntoTable} for inserting data into a Hive table from a
* {@link File}.
*/
public interface FileParser {
/**
* Parses the given file and returns the rows with the requested columns.
*
* @param file The file to be parsed.
* @param schema The full schema of the Hive table.
* @param names The requested field names.
* @return A {@link List} of rows, each represented by an {@link Object} array.
*/
List<Object[]> parse(File file, HCatSchema schema, List<String> names);
/**
* Parses the given file and returns the column names that are available in the file.
*
* @param file The file to be parsed
* @return A {@link List} of column names as Strings
*/
List<String> getColumnNames(File file);
/**
* Method that checks if the parser has access to column names.
* @return
*/
boolean hasColumnNames();
}
