cbr.service
Class PrivilegedOpen

java.lang.Object
  cbr.service.PrivilegedOpen

All Implemented Interfaces:

PrivilegedAction

public class PrivilegedOpen

extends Object

implements PrivilegedAction

This class opens either a FileInputStream or a FileOutputStream to the file that is passed in the constructor, depending on the mode also passed to the constructor.

Version:

"$Id: PrivilegedOpen.java 1913 2007-08-08 02:41:53Z jpeters $"

Author:

Volker Roth

Field Summary

private boolean	create_ If true then the parent directory is created if it does not already exist.
private File	file_ The file from which the image is read.
private boolean	mode_ The mode, either read or write
static boolean	READ
static boolean	WRITE

Constructor Summary

PrivilegedOpen(File file, boolean mode)
Creates an instance that opens the given file for the given mode.

PrivilegedOpen(File file, boolean mode, boolean create)
Creates an instance that opens the given file for the given mode.

Method Summary

Object

run() Depending on the mode that was passed to the constructor this method returns either a FileInputStream or a FileOutputStream to the file passed to the constructor.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

READ

public static final boolean READ

See Also:

Constant Field Values

WRITE

public static final boolean WRITE

See Also:

Constant Field Values

file_

private File file_

The file from which the image is read.

mode_

private boolean mode_

The mode, either read or write

create_

private boolean create_

If true then the parent directory is created if it does not already exist.

Constructor Detail

PrivilegedOpen

public PrivilegedOpen(File file,
                      boolean mode)

Creates an instance that opens the given file for the given mode. The parent directory of the given file must exist or an exception is thrown upon running this instance.

Parameters:

file - The file to open.

mode - The mode, either READ or WRITE.

Throws:

NullPointerException - if no file is given.

PrivilegedOpen

public PrivilegedOpen(File file,
                      boolean mode,
                      boolean create)

Creates an instance that opens the given file for the given mode. If create is true then the parent directory is created if it does not already exist.

Parameters:

file - The file to open.

mode - The mode, either READ or WRITE.

create - true if the parent directory shall be created if it does not already exist.

Throws:

NullPointerException - if no file is given.

Method Detail

run

public Object run()

Depending on the mode that was passed to the constructor this method returns either a FileInputStream or a FileOutputStream to the file passed to the constructor. If for some reason the file could not be opened then null is returned.

Specified by:

run in interface PrivilegedAction

Returns:

The FileInputStream or FileOutputStream or null.