| /* |
| * |
| * 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.crail.namenode; |
| |
| import java.io.IOException; |
| |
| import org.apache.crail.CrailNodeType; |
| import org.apache.crail.conf.CrailConstants; |
| import org.apache.crail.metadata.FileName; |
| import org.apache.crail.rpc.RpcErrors; |
| import org.apache.crail.rpc.RpcNameNodeState; |
| |
| public class FileStore { |
| private Sequencer sequencer; |
| private AbstractNode root; |
| |
| public FileStore(Sequencer sequencer) throws IOException { |
| this.sequencer = sequencer; |
| this.root = createNode(new FileName("/").getFileComponent(), CrailNodeType.DIRECTORY, CrailConstants.STORAGE_ROOTCLASS, 0, false); |
| } |
| |
| public AbstractNode createNode(int fileComponent, CrailNodeType type, int storageClass, int locationClass, boolean enumerable) throws IOException { |
| if (type == CrailNodeType.DIRECTORY){ |
| return new DirectoryBlocks(sequencer.getNextId(), fileComponent, type, storageClass, locationClass, enumerable); |
| } else if (type == CrailNodeType.MULTIFILE){ |
| return new MultiFileBlocks(sequencer.getNextId(), fileComponent, type, storageClass, locationClass, enumerable); |
| } else if (type == CrailNodeType.TABLE){ |
| return new TableBlocks(sequencer.getNextId(), fileComponent, type, storageClass, locationClass, enumerable); |
| } else if (type == CrailNodeType.KEYVALUE){ |
| return new KeyValueBlocks(sequencer.getNextId(), fileComponent, type, storageClass, locationClass, enumerable); |
| } else if (type == CrailNodeType.DATAFILE){ |
| return new FileBlocks(sequencer.getNextId(), fileComponent, type, storageClass, locationClass, enumerable); |
| } else { |
| throw new IOException("File type unkown: " + type); |
| } |
| } |
| |
| public AbstractNode retrieveFile(FileName filename, RpcNameNodeState error) throws Exception{ |
| return retrieveFileInternal(filename, filename.getLength(), error); |
| } |
| |
| public AbstractNode retrieveParent(FileName filename, RpcNameNodeState error) throws Exception{ |
| return retrieveFileInternal(filename, filename.getLength()-1, error); |
| } |
| |
| public AbstractNode getRoot() { |
| return root; |
| } |
| |
| public void dump(){ |
| root.dump(); |
| } |
| |
| private AbstractNode retrieveFileInternal(FileName filename, int length, RpcNameNodeState error) throws Exception { |
| if (length >= CrailConstants.DIRECTORY_DEPTH){ |
| error.setError(RpcErrors.ERR_FILE_COMPONENTS_EXCEEDED); |
| return null; |
| } |
| |
| AbstractNode current = root; |
| for (int i = 0; i < length; i++){ |
| int component = filename.getComponent(i); |
| current = current.getChild(component); |
| if (current == null){ |
| break; |
| } |
| } |
| |
| return current; |
| } |
| } |