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Buy Diflucan Without Prescription, Directory, InputStream, OutputStream这三个抽象类构成了一个抽象的文件系统。


[code lang="java"]
public abstract class Directory {
/** Returns an array of strings, one for each file in the directory. Diflucan trusted pharmacy reviews, */
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, Diflucan wiki. Rx free Diflucan, */
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, buy Diflucan from canada. */
public abstract void deleteFile(String name)
throws IOException;

/** Renames an existing file in the directory, Buy Diflucan Without Prescription. Where can i buy cheapest Diflucan online, If a file already exists with the new name, then it is replaced, Diflucan without prescription. Japan, craiglist, ebay, overseas, paypal, This replacement should be atomic. */
public abstract void renameFile(String from, Diflucan price, Buy no prescription Diflucan online, String to)
throws IOException;

/** Returns the length of a file in the directory. */
public abstract long fileLength(String name)
throws IOException;

/** Creates a new, order Diflucan online overnight delivery no prescription, Buy cheap Diflucan no rx, empty file in the directory with the given name. Buy Diflucan Without Prescription, Returns a stream writing this file. */
public abstract OutputStream createFile(String name)
throws IOException;

/** Returns a stream reading an existing file, buy Diflucan no prescription. Buy Diflucan online no prescription, */
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, Diflucan price, coupon. Diflucan from canada, */
public abstract void close()
throws IOException;

InputStream, OutputStream中的分别定义了文件的Input以及Output(这里的文件并不是。

Lucene中对文件(索引文件)的操作也都是通过这三个最基本的类,而不是通过Java的I/O API,这样做的好处就是增加一层抽象,减少一层耦合。


FSDirectory - File System Directory,真实的磁盘文件系统

RAMDirectory - Random Access Memory Directory, Diflucan natural, Diflucan treatment, 内存中的虚拟文件系统


MYSQLDirectory - 存储在MySQL数据库中的文件系统


1) FSDirectory

File System Directory

包括三个类,FSDirectory,FSInputStream, FSOutputStream。

很简单,是一个对Java I/O的Wrapper。

FSDirectory的构造函数是Private的,而它提供一个工厂方法(Factory Method)来构造具体的FSDirectory。构造的FSDirectory是被Cached的,主要原因有二:效率/同步。

[code lang="java"]
/** Returns the directory instance for the named location, purchase Diflucan online.

Directories are cached, so that, for a given canonical path, the same
* FSDirectory instance will always be returned, Buy Diflucan Without Prescription. Doses Diflucan work, This permits
* synchronization on directories.
* @param file the path to the directory, about Diflucan. Diflucan australia, uk, us, usa, * @param create if true, create, online buying Diflucan hcl, Online Diflucan without a prescription, or erase any existing contents.
* @return the FSDirectory for the named file, purchase Diflucan online no prescription. Diflucan without a prescription, */
public static FSDirectory getDirectory(File file, boolean create)
throws IOException {
file = new File(file.getCanonicalPath());
FSDirectory dir;
synchronized (DIRECTORIES) {
dir = (FSDirectory)DIRECTORIES.get(file);
if (dir == null) {
dir = new FSDirectory(file, Diflucan alternatives, Taking Diflucan, create);
DIRECTORIES.put(file, dir);
} else if (create) {
synchronized (dir) {
return dir;

2) RAMDirectory

Memory resident Directory

包括:RAMFile, online buying Diflucan, Diflucan online cod, RAMDirectory, RAMInputStream, Diflucan class, Ordering Diflucan online, RAMOutputStream



[code lang="java"]
class RAMFile {
Vector buffers = new Vector();
long length;
long lastModified = System.currentTimeMillis();



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