File	Doc	Category	Size	Date	Package
RAMDirectory.java	API Doc	Apache Lucene 2.2.0	7822	Sat Jun 16 22:20:36 BST 2007	org.apache.lucene.store

RAMDirectory

• java.lang.Object
  • org.apache.lucene.store.Directory

Fields Summary
private static final long	serialVersionUID
HashMap	fileMap
long	sizeInBytes

Constructors Summary
public RAMDirectory() Constructs an empty {@link Directory}. // ***** // Lock acquisition sequence: RAMDirectory, then RAMFile // ***** setLockFactory(new SingleInstanceLockFactory());
public RAMDirectory(Directory dir) Creates a new RAMDirectory instance from a different Directory implementation. This can be used to load a disk-based index into memory. This should be used only with indices that can fit into memory. Note that the resulting RAMDirectory instance is fully independent from the original Directory (it is a complete copy). Any subsequent changes to the original Directory will not be visible in the RAMDirectory instance. param dir a Directory value exception IOException if an error occurs this(dir, false);
private RAMDirectory(Directory dir, boolean closeDir) this(); Directory.copy(dir, this, closeDir);
public RAMDirectory(File dir) Creates a new RAMDirectory instance from the {@link FSDirectory}. param dir a File specifying the index directory see #RAMDirectory(Directory) this(FSDirectory.getDirectory(dir), true);
public RAMDirectory(String dir) Creates a new RAMDirectory instance from the {@link FSDirectory}. param dir a String specifying the full index directory path see #RAMDirectory(Directory) this(FSDirectory.getDirectory(dir), true);

Methods Summary
public void	close() Closes the store to future operations, releasing associated memory. fileMap = null;
public org.apache.lucene.store.IndexOutput	createOutput(java.lang.String name) Creates a new, empty file in the directory with the given name. Returns a stream writing this file. ensureOpen(); RAMFile file = new RAMFile(this); synchronized (this) { RAMFile existing = (RAMFile)fileMap.get(name); if (existing!=null) { sizeInBytes -= existing.sizeInBytes; existing.directory = null; } fileMap.put(name, file); } return new RAMOutputStream(file);
public synchronized void	deleteFile(java.lang.String name) Removes an existing file in the directory. throws IOException if the file does not exist ensureOpen(); RAMFile file = (RAMFile)fileMap.get(name); if (file!=null) { fileMap.remove(name); file.directory = null; sizeInBytes -= file.sizeInBytes; // updates to RAMFile.sizeInBytes synchronized on directory } else throw new FileNotFoundException(name);
protected final void	ensureOpen() throws AlreadyClosedException if this IndexReader is closed if (fileMap == null) { throw new AlreadyClosedException("this RAMDirectory is closed"); }
public final boolean	fileExists(java.lang.String name) Returns true iff the named file exists in this directory. ensureOpen(); RAMFile file; synchronized (this) { file = (RAMFile)fileMap.get(name); } return file != null;
public final long	fileLength(java.lang.String name) Returns the length in bytes of a file in the directory. throws IOException if the file does not exist ensureOpen(); RAMFile file; synchronized (this) { file = (RAMFile)fileMap.get(name); } if (file==null) throw new FileNotFoundException(name); return file.getLength();
public final long	fileModified(java.lang.String name) Returns the time the named file was last modified. throws IOException if the file does not exist ensureOpen(); RAMFile file; synchronized (this) { file = (RAMFile)fileMap.get(name); } if (file==null) throw new FileNotFoundException(name); return file.getLastModified();
public final synchronized java.lang.String[]	list() Returns an array of strings, one for each file in the directory. ensureOpen(); Set fileNames = fileMap.keySet(); String[] result = new String[fileNames.size()]; int i = 0; Iterator it = fileNames.iterator(); while (it.hasNext()) result[i++] = (String)it.next(); return result;
public org.apache.lucene.store.IndexInput	openInput(java.lang.String name) Returns a stream reading an existing file. ensureOpen(); RAMFile file; synchronized (this) { file = (RAMFile)fileMap.get(name); } if (file == null) throw new FileNotFoundException(name); return new RAMInputStream(file);
public final synchronized void	renameFile(java.lang.String from, java.lang.String to) Renames an existing file in the directory. throws FileNotFoundException if from does not exist deprecated ensureOpen(); RAMFile fromFile = (RAMFile)fileMap.get(from); if (fromFile==null) throw new FileNotFoundException(from); RAMFile toFile = (RAMFile)fileMap.get(to); if (toFile!=null) { sizeInBytes -= toFile.sizeInBytes; // updates to RAMFile.sizeInBytes synchronized on directory toFile.directory = null; } fileMap.remove(from); fileMap.put(to, fromFile);
public final synchronized long	sizeInBytes() Return total size in bytes of all files in this directory. This is currently quantized to RAMOutputStream.BUFFER_SIZE. ensureOpen(); return sizeInBytes;
public void	touchFile(java.lang.String name) Set the modified time of an existing file to now. throws IOException if the file does not exist ensureOpen(); RAMFile file; synchronized (this) { file = (RAMFile)fileMap.get(name); } if (file==null) throw new FileNotFoundException(name); long ts2, ts1 = System.currentTimeMillis(); do { try { Thread.sleep(0, 1); } catch (InterruptedException e) {} ts2 = System.currentTimeMillis(); } while(ts1 == ts2); file.setLastModified(ts2);