| /* |
| * 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.kylin.engine.mr; |
| |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.kylin.common.util.HadoopUtil; |
| import org.apache.kylin.common.util.Pair; |
| import org.apache.kylin.source.IReadableTable; |
| |
| /** |
| */ |
| public class DFSFileTable implements IReadableTable { |
| |
| public static final String DELIM_AUTO = "auto"; |
| public static final String DELIM_COMMA = ","; |
| |
| String path; |
| String delim; |
| int nColumns; |
| |
| public DFSFileTable(String path, int nColumns) { |
| this(path, DELIM_AUTO, nColumns); |
| } |
| |
| public DFSFileTable(String path, String delim, int nColumns) { |
| this.path = path; |
| this.delim = delim; |
| this.nColumns = nColumns; |
| } |
| |
| public String getColumnDelimeter() { |
| return delim; |
| } |
| |
| @Override |
| public TableReader getReader() throws IOException { |
| return new DFSFileTableReader(path, delim, nColumns); |
| } |
| |
| @Override |
| public TableSignature getSignature() throws IOException { |
| Pair<Long, Long> sizeAndLastModified; |
| try { |
| sizeAndLastModified = getSizeAndLastModified(path); |
| } catch (FileNotFoundException ex) { |
| sizeAndLastModified = Pair.newPair(-1L, 0L); |
| } |
| return new TableSignature(path, sizeAndLastModified.getFirst(), sizeAndLastModified.getSecond()); |
| } |
| |
| @Override |
| public boolean exists() throws IOException { |
| try { |
| getSizeAndLastModified(path); |
| return true; |
| } catch (FileNotFoundException ex) { |
| return false; |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return path; |
| } |
| |
| public static Pair<Long, Long> getSizeAndLastModified(String path) throws IOException { |
| FileSystem fs = HadoopUtil.getFileSystem(path); |
| |
| // get all contained files if path is directory |
| ArrayList<FileStatus> allFiles = new ArrayList<>(); |
| FileStatus status = fs.getFileStatus(new Path(path)); |
| if (status.isFile()) { |
| allFiles.add(status); |
| } else { |
| FileStatus[] listStatus = fs.listStatus(new Path(path)); |
| allFiles.addAll(Arrays.asList(listStatus)); |
| } |
| |
| long size = 0; |
| long lastModified = 0; |
| for (FileStatus file : allFiles) { |
| size += file.getLen(); |
| lastModified = Math.max(lastModified, file.getModificationTime()); |
| } |
| |
| return Pair.newPair(size, lastModified); |
| } |
| |
| } |