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java.lang.Objectorg.apache.lucene.store.Directory
org.apache.lucene.store.RAMDirectory
public class RAMDirectory
A memory-resident Directory
implementation. Locking
implementation is by default the SingleInstanceLockFactory
but can be changed with Directory.setLockFactory(org.apache.lucene.store.LockFactory)
.
Field Summary |
---|
Fields inherited from class org.apache.lucene.store.Directory |
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isOpen, lockFactory |
Constructor Summary | |
---|---|
RAMDirectory()
Constructs an empty Directory . |
|
RAMDirectory(Directory dir)
Creates a new RAMDirectory instance from a different
Directory implementation. |
Method Summary | |
---|---|
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[] |
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. |
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. |
Methods inherited from class org.apache.lucene.store.Directory |
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clearLock, copy, ensureOpen, getLockFactory, getLockID, makeLock, openInput, setLockFactory, sync, toString |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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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
value
java.io.IOException
- if an error occursMethod Detail |
---|
public final java.lang.String[] listAll()
Directory
listAll
in class Directory
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
touchFile
in class Directory
java.io.IOException
- if the file does not existpublic 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 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
openInput
in class Directory
java.io.IOException
public void close()
close
in interface java.io.Closeable
close
in class Directory
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