| /* |
| * 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.drill.exec.store.xml; |
| |
| import java.io.InputStream; |
| |
| import org.apache.drill.common.AutoCloseables; |
| import org.apache.drill.common.exceptions.CustomErrorContext; |
| import org.apache.drill.common.exceptions.UserException; |
| import org.apache.drill.exec.physical.impl.scan.v3.ManagedReader; |
| import org.apache.drill.exec.physical.impl.scan.v3.file.FileDescrip; |
| import org.apache.drill.exec.physical.impl.scan.v3.file.FileSchemaNegotiator; |
| import org.apache.drill.exec.physical.resultSet.ResultSetLoader; |
| import org.apache.drill.exec.physical.resultSet.RowSetLoader; |
| import org.apache.drill.exec.store.dfs.easy.EasySubScan; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| public class XMLBatchReader implements ManagedReader { |
| |
| private static final Logger logger = LoggerFactory.getLogger(XMLBatchReader.class); |
| |
| private final FileDescrip file; |
| private final RowSetLoader rootRowWriter; |
| private final CustomErrorContext errorContext; |
| |
| private XMLReader reader; |
| private final int dataLevel; |
| |
| static class XMLReaderConfig { |
| final XMLFormatPlugin plugin; |
| final int dataLevel; |
| |
| XMLReaderConfig(XMLFormatPlugin plugin) { |
| this.plugin = plugin; |
| dataLevel = plugin.getConfig().dataLevel; |
| } |
| } |
| |
| public XMLBatchReader(XMLReaderConfig readerConfig, EasySubScan scan, FileSchemaNegotiator negotiator) { |
| errorContext = negotiator.parentErrorContext(); |
| dataLevel = readerConfig.dataLevel; |
| file = negotiator.file(); |
| |
| ResultSetLoader loader = negotiator.build(); |
| rootRowWriter = loader.writer(); |
| |
| openFile(); |
| } |
| |
| @Override |
| public boolean next() { |
| return reader.next(); |
| } |
| |
| @Override |
| public void close() { |
| AutoCloseables.closeSilently(reader); |
| } |
| |
| private void openFile() { |
| try { |
| InputStream fsStream = file.fileSystem().openPossiblyCompressedStream(file.split().getPath()); |
| reader = new XMLReader(fsStream, dataLevel); |
| reader.open(rootRowWriter, errorContext); |
| } catch (Exception e) { |
| throw UserException |
| .dataReadError(e) |
| .message(String.format("Failed to open input file: %s", file.split().getPath().toString())) |
| .addContext(errorContext) |
| .addContext(e.getMessage()) |
| .build(logger); |
| } |
| } |
| } |