| /* |
| * 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.physical.impl.scan.v3.file; |
| |
| import org.apache.drill.exec.store.ColumnExplorer; |
| import org.apache.hadoop.fs.Path; |
| |
| /** |
| * Specify the file name and optional selection root. If the selection root |
| * is provided, then partitions are defined as the portion of the file name |
| * that is not also part of the selection root. That is, if selection root is |
| * /a/b and the file path is /a/b/c/d.csv, then dir0 is c. |
| */ |
| public class FileDescrip { |
| |
| private final Path filePath; |
| private final String[] dirPath; |
| |
| public FileDescrip(Path filePath, Path selectionRoot) { |
| this.filePath = filePath; |
| |
| // If the data source is not a file, no file metadata is available. |
| if (selectionRoot == null || filePath == null) { |
| dirPath = null; |
| return; |
| } |
| |
| // If the query is against a single file, selection root and file path |
| // will be identical, oddly. |
| Path rootPath = Path.getPathWithoutSchemeAndAuthority(selectionRoot); |
| Path bareFilePath = Path.getPathWithoutSchemeAndAuthority(filePath); |
| if (rootPath.equals(bareFilePath)) { |
| dirPath = null; |
| return; |
| } |
| |
| dirPath = ColumnExplorer.parsePartitions(filePath, rootPath, false); |
| if (dirPath == null) { |
| throw new IllegalArgumentException( |
| String.format("Selection root of \"%s\" is not a leading path of \"%s\"", |
| selectionRoot.toString(), filePath.toString())); |
| } |
| } |
| |
| public Path filePath() { return filePath; } |
| |
| public String partition(int index) { |
| if (dirPath == null || dirPath.length <= index) { |
| return null; |
| } |
| return dirPath[index]; |
| } |
| |
| public int dirPathLength() { |
| return dirPath == null ? 0 : dirPath.length; |
| } |
| |
| public boolean isSet() { return filePath != null; } |
| } |