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/*
* 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.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 FileMetadata {
private final Path filePath;
private final String[] dirPath;
public FileMetadata(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; }
}
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