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What this is

This file is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

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.
 *
 * 

Java's i/o APIs not used directly, but rather all i/o is * through this API. This permits things such as:

    *
  • implementation of RAM-based indices; *
  • implementation indices stored in a database, via JDBC; *
  • implementation of an index as a single file; *
* * @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 OutputStream createFile(String name) throws IOException; /** Returns a stream reading an existing file. */ public abstract InputStream openFile(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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