public class RAMDirectory extends Directory implements java.io.Serializable
Directory
implementation. Locking
implementation is by default the SingleInstanceLockFactory
but can be changed with Directory.setLockFactory(org.apache.lucene.store.LockFactory)
.isOpen, lockFactory
Constructor and Description |
---|
RAMDirectory()
Constructs an empty
Directory . |
RAMDirectory(Directory dir)
Creates a new
RAMDirectory instance from a different
Directory implementation. |
RAMDirectory(java.io.File dir)
Deprecated.
Use
RAMDirectory(Directory) instead |
RAMDirectory(java.lang.String dir)
Deprecated.
Use
RAMDirectory(Directory) instead |
Modifier and Type | Method and Description |
---|---|
void |
close()
Closes the store to future operations, releasing associated memory.
|
IndexOutput |
createOutput(java.lang.String name)
Creates a new, empty file in the directory with the given name.
|
void |
deleteFile(java.lang.String name)
Removes an existing file in the directory.
|
boolean |
fileExists(java.lang.String name)
Returns true iff the named file exists in this directory.
|
long |
fileLength(java.lang.String name)
Returns the length in bytes of a file in the directory.
|
long |
fileModified(java.lang.String name)
Returns the time the named file was last modified.
|
java.lang.String[] |
list()
List the files in the directory.
|
java.lang.String[] |
listAll()
Returns an array of strings, one for each file in the
directory.
|
IndexInput |
openInput(java.lang.String name)
Returns a stream reading an existing file.
|
void |
renameFile(java.lang.String from,
java.lang.String to)
Deprecated.
|
long |
sizeInBytes()
Return total size in bytes of all files in this
directory.
|
void |
touchFile(java.lang.String name)
Set the modified time of an existing file to now.
|
clearLock, copy, ensureOpen, getLockFactory, getLockID, makeLock, openInput, setLockFactory, sync, toString
public RAMDirectory()
Directory
.public RAMDirectory(Directory dir) throws java.io.IOException
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.
dir
- a Directory
valuejava.io.IOException
- if an error occurspublic RAMDirectory(java.io.File dir) throws java.io.IOException
RAMDirectory(Directory)
insteadRAMDirectory
instance from the FSDirectory
.dir
- a File
specifying the index directoryjava.io.IOException
RAMDirectory(Directory)
public RAMDirectory(java.lang.String dir) throws java.io.IOException
RAMDirectory(Directory)
insteadRAMDirectory
instance from the FSDirectory
.dir
- a String
specifying the full index directory pathjava.io.IOException
RAMDirectory(Directory)
public final java.lang.String[] list()
Directory
public final java.lang.String[] listAll()
Directory
Directory.list()
this method does no
filtering of the contents in a directory, and it will
never return null (throws IOException instead).
Currently this method simply falls back to Directory.list()
for Directory impls outside of Lucene's core &
contrib, but in 3.0 that method will be removed and
this method will become abstract.public final boolean fileExists(java.lang.String name)
fileExists
in class Directory
public final long fileModified(java.lang.String name) throws java.io.IOException
fileModified
in class Directory
java.io.IOException
- if the file does not existpublic void touchFile(java.lang.String name) throws java.io.IOException
public final long fileLength(java.lang.String name) throws java.io.IOException
fileLength
in class Directory
java.io.IOException
- if the file does not existpublic final long sizeInBytes()
public void deleteFile(java.lang.String name) throws java.io.IOException
deleteFile
in class Directory
java.io.IOException
- if the file does not existpublic final void renameFile(java.lang.String from, java.lang.String to) throws java.io.IOException
renameFile
in class Directory
java.io.FileNotFoundException
- if from does not existjava.io.IOException
public IndexOutput createOutput(java.lang.String name) throws java.io.IOException
createOutput
in class Directory
java.io.IOException
public IndexInput openInput(java.lang.String name) throws java.io.IOException
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