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java.lang.Objectjava.io.File
org.apache.derby.impl.io.DirFile
org.apache.derby.impl.io.DirFile4
This class implements the StorageFile interface using features of Java 1.4 not available in earlier versions of Java.
Field Summary | |
private java.nio.channels.FileLock |
dbLock
|
private java.nio.channels.FileChannel |
lockFileChannel
|
private java.io.RandomAccessFile |
lockFileOpen
|
private boolean |
rwsOK
|
Fields inherited from class java.io.File |
pathSeparator, pathSeparatorChar, separator, separatorChar |
Fields inherited from interface org.apache.derby.io.StorageFile |
EXCLUSIVE_FILE_LOCK, EXCLUSIVE_FILE_LOCK_NOT_AVAILABLE, NO_FILE_LOCK_SUPPORT |
Constructor Summary | |
(package private) |
DirFile4(DirFile directoryName,
java.lang.String fileName,
boolean rwsOK)
Construct a DirFile from a directory name and a file name. |
(package private) |
DirFile4(java.lang.String path,
boolean rwsOK)
Construct a DirFile from a path name. |
(package private) |
DirFile4(java.lang.String directoryName,
java.lang.String fileName,
boolean rwsOK)
Construct a DirFile from a directory name and a file name. |
Method Summary | |
boolean |
deleteAll()
Deletes the named file and, if it is a directory, all the files and directories it contains. |
int |
getExclusiveFileLock()
Get an exclusive lock. |
java.io.InputStream |
getInputStream()
Creates an input stream from a file name. |
java.io.OutputStream |
getOutputStream()
Creates an output stream from a file name. |
java.io.OutputStream |
getOutputStream(boolean append)
Creates an output stream from a file name. |
StorageFile |
getParentDir()
Get the name of the parent directory if this name includes a parent. |
StorageRandomAccessFile |
getRandomAccessFile(java.lang.String mode)
Get a random access (read/write) file. |
(package private) static StorageFile |
getTempDir()
Get the name of the directory of temporary files. |
void |
releaseExclusiveFileLock()
Release the resource associated with an earlier acquired exclusive lock |
boolean |
renameTo(StorageFile newName)
Rename the file denoted by this name. |
Methods inherited from class java.io.File |
canRead, canWrite, compareTo, compareTo, createNewFile, createTempFile, createTempFile, delete, deleteOnExit, equals, exists, getAbsoluteFile, getAbsolutePath, getCanonicalFile, getCanonicalPath, getName, getParent, getParentFile, getPath, hashCode, isAbsolute, isDirectory, isFile, isHidden, lastModified, length, list, list, listFiles, listFiles, listFiles, listRoots, mkdir, mkdirs, renameTo, setLastModified, setReadOnly, toString, toURI, toURL |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface org.apache.derby.io.StorageFile |
canWrite, createNewFile, delete, exists, getCanonicalPath, getName, getPath, isDirectory, length, list, mkdir, mkdirs, setReadOnly, toString |
Field Detail |
private java.io.RandomAccessFile lockFileOpen
private java.nio.channels.FileChannel lockFileChannel
private java.nio.channels.FileLock dbLock
private final boolean rwsOK
Constructor Detail |
DirFile4(java.lang.String path, boolean rwsOK)
path
- The path name.DirFile4(java.lang.String directoryName, java.lang.String fileName, boolean rwsOK)
fileName
- The name of the file within the directory.DirFile4(DirFile directoryName, java.lang.String fileName, boolean rwsOK)
fileName
- The name of the file within the directory.Method Detail |
public StorageFile getParentDir()
getParentDir
in interface StorageFile
getParentDir
in class DirFile
public java.io.OutputStream getOutputStream(boolean append) throws java.io.FileNotFoundException
getOutputStream
in interface StorageFile
getOutputStream
in class DirFile
append
- If true then data will be appended to the end of the file, if it already exists.
If false and a normal file already exists with this name the file will first be truncated
to zero length.
java.io.FileNotFoundException
- if the file exists but is a directory
rather than a regular file, does not exist but cannot be created, or
cannot be opened for any other reason.public int getExclusiveFileLock()
DirFile
getExclusiveFileLock
in interface StorageFile
getExclusiveFileLock
in class DirFile
public void releaseExclusiveFileLock()
DirFile
releaseExclusiveFileLock
in interface StorageFile
releaseExclusiveFileLock
in class DirFile
DirFile.getExclusiveFileLock()
public StorageRandomAccessFile getRandomAccessFile(java.lang.String mode) throws java.io.FileNotFoundException
getRandomAccessFile
in interface StorageFile
getRandomAccessFile
in class DirFile
mode
- "r", "rw", "rws", or "rwd". The "rws" and "rwd" modes specify
that the data is to be written to persistent store, consistent with the
java.io.RandomAccessFile class ("synchronized" with the persistent
storage, in the file system meaning of the word "synchronized"). However
the implementation is not required to implement the "rws" or "rwd"
modes. The implementation may treat "rws" and "rwd" as "rw". It is up to
the user of this interface to call the StorageRandomAccessFile.sync
method. If the "rws" or "rwd" modes are supported and the
RandomAccessFile was opened in "rws" or "rwd" mode then the
implementation of StorageRandomAccessFile.sync need not do anything.
java.lang.IllegalArgumentException
- if the mode argument is not equal to one of "r", "rw".
java.io.FileNotFoundException
- if the file exists but is a directory rather than a regular
file, or cannot be opened or created for any other reason .static StorageFile getTempDir() throws java.io.IOException
java.io.IOException
public java.io.OutputStream getOutputStream() throws java.io.FileNotFoundException
getOutputStream
in interface StorageFile
java.io.FileNotFoundException
- if the file exists but is a directory
rather than a regular file, does not exist but cannot be created, or
cannot be opened for any other reason.public java.io.InputStream getInputStream() throws java.io.FileNotFoundException
getInputStream
in interface StorageFile
java.io.FileNotFoundException
- if the file is not found.public boolean renameTo(StorageFile newName)
It is not specified whether this method will succeed if a file already exists under the new name.
renameTo
in interface StorageFile
newName
- the new name.
public boolean deleteAll()
deleteAll
in interface StorageFile
|
Built on Mon 2007-06-04 09:58:47+0400, from revision ??? | |||||||||
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