?? directory.java
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package org.apache.lucene.store;/** * Copyright 2004 The Apache Software Foundation * * Licensed 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. */import java.io.IOException;/** A Directory is a flat list of files. Files may be written once, when they * are created. Once a file is created it may only be opened for read, or * deleted. Random access is permitted both when reading and writing. * * <p> Java's i/o APIs not used directly, but rather all i/o is * through this API. This permits things such as: <ul> * <li> implementation of RAM-based indices; * <li> implementation indices stored in a database, via JDBC; * <li> implementation of an index as a single file; * </ul> * * @author Doug Cutting */public abstract class Directory { /** Returns an array of strings, one for each file in the directory. */ public abstract String[] list() throws IOException; /** Returns true iff a file with the given name exists. */ public abstract boolean fileExists(String name) throws IOException; /** Returns the time the named file was last modified. */ public abstract long fileModified(String name) throws IOException; /** Set the modified time of an existing file to now. */ public abstract void touchFile(String name) throws IOException; /** Removes an existing file in the directory. */ public abstract void deleteFile(String name) throws IOException; /** Renames an existing file in the directory. If a file already exists with the new name, then it is replaced. This replacement should be atomic. */ public abstract void renameFile(String from, String to) throws IOException; /** Returns the length of a file in the directory. */ public abstract long fileLength(String name) throws IOException; /** Creates a new, empty file in the directory with the given name. Returns a stream writing this file. */ public abstract IndexOutput createOutput(String name) throws IOException; /** Returns a stream reading an existing file. */ public abstract IndexInput openInput(String name) throws IOException; /** Construct a {@link Lock}. * @param name the name of the lock file */ public abstract Lock makeLock(String name); /** Closes the store. */ public abstract void close() throws IOException;}
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