| /** |
| * 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.hadoop.hdfs; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.net.InetSocketAddress; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.util.StringTokenizer; |
| |
| import org.apache.hadoop.fs.BlockLocation; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.protocol.DatanodeInfo; |
| import org.apache.hadoop.hdfs.protocol.LocatedBlock; |
| import org.apache.hadoop.hdfs.protocol.LocatedBlocks; |
| import org.apache.hadoop.net.NodeBase; |
| |
| public class DFSUtil { |
| /** |
| * Whether the pathname is valid. Currently prohibits relative paths, |
| * and names which contain a ":" or "/" |
| */ |
| public static boolean isValidName(String src) { |
| |
| // Path must be absolute. |
| if (!src.startsWith(Path.SEPARATOR)) { |
| return false; |
| } |
| |
| // Check for ".." "." ":" "/" |
| StringTokenizer tokens = new StringTokenizer(src, Path.SEPARATOR); |
| while(tokens.hasMoreTokens()) { |
| String element = tokens.nextToken(); |
| if (element.equals("..") || |
| element.equals(".") || |
| (element.indexOf(":") >= 0) || |
| (element.indexOf("/") >= 0)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Converts a byte array to a string using UTF8 encoding. |
| */ |
| public static String bytes2String(byte[] bytes) { |
| try { |
| return new String(bytes, "UTF8"); |
| } catch(UnsupportedEncodingException e) { |
| assert false : "UTF8 encoding is not supported "; |
| } |
| return null; |
| } |
| |
| /** |
| * Converts a string to a byte array using UTF8 encoding. |
| */ |
| public static byte[] string2Bytes(String str) { |
| try { |
| return str.getBytes("UTF8"); |
| } catch(UnsupportedEncodingException e) { |
| assert false : "UTF8 encoding is not supported "; |
| } |
| return null; |
| } |
| |
| /** |
| * Convert a LocatedBlocks to BlockLocations[] |
| * @param blocks a LocatedBlocks |
| * @return an array of BlockLocations |
| */ |
| public static BlockLocation[] locatedBlocks2Locations(LocatedBlocks blocks) { |
| if (blocks == null) { |
| return new BlockLocation[0]; |
| } |
| int nrBlocks = blocks.locatedBlockCount(); |
| BlockLocation[] blkLocations = new BlockLocation[nrBlocks]; |
| int idx = 0; |
| for (LocatedBlock blk : blocks.getLocatedBlocks()) { |
| assert idx < nrBlocks : "Incorrect index"; |
| DatanodeInfo[] locations = blk.getLocations(); |
| String[] hosts = new String[locations.length]; |
| String[] names = new String[locations.length]; |
| String[] racks = new String[locations.length]; |
| for (int hCnt = 0; hCnt < locations.length; hCnt++) { |
| hosts[hCnt] = locations[hCnt].getHostName(); |
| names[hCnt] = locations[hCnt].getName(); |
| NodeBase node = new NodeBase(names[hCnt], |
| locations[hCnt].getNetworkLocation()); |
| racks[hCnt] = node.toString(); |
| } |
| blkLocations[idx] = new BlockLocation(names, hosts, racks, |
| blk.getStartOffset(), |
| blk.getBlockSize()); |
| idx++; |
| } |
| return blkLocations; |
| } |
| |
| /** Create a URI from the scheme and address */ |
| public static URI createUri(String scheme, InetSocketAddress address) { |
| try { |
| return new URI(scheme, null, address.getHostName(), address.getPort(), |
| null, null, null); |
| } catch (URISyntaxException ue) { |
| throw new IllegalArgumentException(ue); |
| } |
| } |
| } |
| |