| /** |
| * 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.server.namenode; |
| |
| import com.google.common.base.Charsets; |
| import com.google.common.collect.ImmutableList; |
| import com.google.protobuf.ByteString; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.AbstractMap; |
| import java.util.Map; |
| |
| class Resolver { |
| enum Error { |
| OK, |
| NOT_FOUND, |
| INVALID_PATH, |
| } |
| |
| static final class Result { |
| final FlatINodesInPath iip; |
| |
| final String src; |
| // The offset that points to the last unresolved component. |
| final int offset; |
| final Error errorCode; |
| |
| private Result( |
| ImmutableList<Map.Entry<ByteString, FlatINode>> iip, |
| String src, int |
| offset, final Error errorCode) { |
| this.src = src; |
| this.iip = new FlatINodesInPath(iip); |
| this.offset = offset; |
| this.errorCode = errorCode; |
| } |
| |
| // byte[] getLastKey() { |
| // return inodes.get(inodes.size() - 1).getKey(); |
| // } |
| FlatINode getLastINode(int offset) { |
| return iip.getLastINode(offset); |
| } |
| |
| public boolean ok() { |
| return errorCode == Error.OK; |
| } |
| |
| public boolean invalidPath() { |
| return errorCode == Error.INVALID_PATH; |
| } |
| |
| public boolean notFound() { |
| return errorCode == Error.NOT_FOUND; |
| } |
| |
| // byte[] getLastComponent() { return Encoding.parseInodeKey(getLastKey()) |
| // .getValue(); } |
| |
| FlatINodesInPath inodesInPath() { |
| return iip; |
| } |
| |
| String path() { |
| return iip.path(); |
| } |
| } |
| |
| static Result resolve(Transaction tx, final String path) |
| throws IOException { |
| long parentId = INodeId.ROOT_INODE_ID; |
| int offset = 0; |
| ImmutableList.Builder<Map.Entry<ByteString, FlatINode>> paths = ImmutableList |
| .builder(); |
| paths.add(newPathEntry(Encoding.INODE_ROOT, |
| tx.getINode(INodeId.ROOT_INODE_ID))); |
| int end = path.length(); |
| while (end > 0 && path.charAt(end - 1) == '/') { |
| --end; |
| } |
| while (offset < end) { |
| if (path.charAt(offset) != '/') { |
| return new Result(paths.build(), path, offset, Error.INVALID_PATH); |
| } |
| |
| int next = path.indexOf('/', offset + 1); |
| if (next == -1) { |
| next = end; |
| } |
| String component = path.substring(offset + 1, next); |
| long childId = tx.getChild(parentId, ByteBuffer.wrap(component.getBytes |
| ())); |
| if (childId == INodeId.INVALID_INODE_ID) { |
| return new Result(paths.build(), path, offset, Error.NOT_FOUND); |
| } |
| FlatINode child = tx.getINode(childId); |
| if (child == null) { |
| return new Result(paths.build(), path, offset, Error.NOT_FOUND); |
| } |
| paths.add(newPathEntry(component, child)); |
| FlatINode inode = child; |
| offset = next; |
| parentId = inode.id(); |
| } |
| |
| return new Result(paths.build(), path, offset, Error.OK); |
| } |
| |
| static Result resolveNoSymlink(Transaction tx, final String path) |
| throws IOException { |
| return resolve(tx, path); |
| } |
| |
| public static Result resolveById(Transaction tx, long id) { |
| throw new IllegalArgumentException("Unimplemented"); |
| } |
| |
| // public static Result getInodeById(Transaction tx, long id) |
| // throws IOException { |
| // byte[] inodeKey = Encoding.inodeIdKey(id); |
| // byte[] realKey = tx.get(inodeKey); |
| // if (realKey == null) { |
| // return new Result(EMPTY_PATHS, 0, Error.NOT_FOUND); |
| // } else { |
| // byte[] value = tx.get(realKey); |
| // assert value != null; |
| // ImmutableList<Map.Entry<byte[], INode>> inodes = ImmutableList.of |
| // (newPathEntry(realKey, value)); |
| // return new Result(inodes, 0, Error.OK); |
| // } |
| // } |
| |
| private static Map.Entry<ByteString, FlatINode> newPathEntry( |
| ByteString key, FlatINode value) { |
| return new AbstractMap.SimpleImmutableEntry<>(key, value); |
| } |
| |
| static Map.Entry<ByteString, FlatINode> newPathEntry(String key, |
| FlatINode value) { |
| return newPathEntry(ByteString.copyFromUtf8(key), value); |
| } |
| } |