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: http://www.atnf.csiro.au/computing/software/casacore/casacore-1.2.0/doc/html/classcasa_1_1SymLink.html
Дата изменения: Unknown Дата индексирования: Mon Feb 14 20:55:28 2011 Кодировка: Поисковые слова: п п п п п п п п п п п п п п п п п п п п п п п п п п п п п |
Get information about, and manipulate symbolic links. More...
#include <SymLink.h>
Public Member Functions | |
| SymLink () | |
| The default constructor creates a SymLink with path ".". | |
| SymLink (const Path &name) | |
| Create a SymLink with the given path. | |
| SymLink (const String &name) | |
| SymLink (const File &name) | |
| SymLink (const SymLink &that) | |
| Copy constructor (copy semantics). | |
| ~SymLink () | |
| SymLink & | operator= (const SymLink &that) |
| Assignment (copy semantics). | |
| void | create (const Path &target, Bool overwrite=True) |
| Make a symbolic link to a file given by target. | |
| void | create (const String &target, Bool overwrite=True) |
| void | copy (const Path &target, Bool overwrite=True) const |
| Copy the symlink to the target path using the system command cp. | |
| void | copy (const String &target, Bool overwrite=True) const |
| void | move (const Path &target, Bool overwrite=True) |
| Move the symlink to the target path using the system command mv. | |
| void | move (const String &target, Bool overwrite=True) |
| void | remove () |
| Remove a symbolic link. | |
| Path | readSymLink () const |
| Read value of a symbolic link and return it as a Path. | |
| Path | followSymLink () const |
| As readSymLink, but the entire symlink chain is followed when the symlinks points to other symlinks. | |
Private Member Functions | |
| void | checkPath () const |
| Check if the path of the file is valid. | |
| String | getSymLink () const |
| Get the value of the symlink. | |
Get information about, and manipulate symbolic links.
Public interface
The class SymLink handles SYMbolic LINKs in the file system.
SymLink provides functions to manipulate and to get information about symbolic links. The functions for getting information (like ownership, dates) about symbolic links are inherited from the File class.
The class SymLink itself provides functions to create, remove, copy, and move symbolic links. There is a function readSymLink which reads a link and then returns a path and there is a function followSymLink which reads a link recursively. If the link eventually refers to itself (a loop), an exception will be thrown.
SymLink symLink1("isLink"); SymLink symLink2("isLink2"); SymLink symLinkA("A"); SymLink symLinkB("B"); symLink1.create("~", True); // Create a symbolic link to the home // directory. When it exists it will be // overwritten. symLink2.create("isLink", False); // Create a symbolic link to // isLink. When it exists it will not // be overwritten. symLinkA.create(Path("B")); // Create a recursive link symLinkB.create(Path("A")); // Create a recursive link cout << symLink1.readSymLink() << endl; // The homedirectory is printed cout << symLink2.readSymLink() << endl; // isLink is printed cout << symLink2.followSymLink() << endl;// The homedirectory is printed cout << symLinkA.readSymLink() << endl; // B is printed cout << symLinkA.followSymLink() << endl;// An exception is thrown (loop)
Provide functions for manipulating and getting information about symbolic links.
Definition at line 100 of file SymLink.h.
| casa::SymLink::SymLink | ( | ) |
The default constructor creates a SymLink with path ".".
| casa::SymLink::SymLink | ( | const Path & | name | ) |
Create a SymLink with the given path.
An exception is thrown if the path exist and is no symbolic link or if it does not exist, but cannot be created.
| casa::SymLink::SymLink | ( | const String & | name | ) |
| casa::SymLink::SymLink | ( | const File & | name | ) |
| casa::SymLink::SymLink | ( | const SymLink & | that | ) |
Copy constructor (copy semantics).
| casa::SymLink::~SymLink | ( | ) |
| void casa::SymLink::checkPath | ( | ) | const [private] |
Check if the path of the file is valid.
Also resolve possible symlinks.
Copy the symlink to the target path using the system command cp.
The target path can be a directory or a file (as in cp). An exception is thrown if:
- the target directory is not writable
- or the target file already exists and overwrite==False
- or the target file already exists and is not writable
Referenced by copy().
Make a symbolic link to a file given by target.
An exception will be thrown if:
-target already exists and is no symlink
-or target already exists and overwrite==False
Referenced by create().
| Path casa::SymLink::followSymLink | ( | ) | const |
As readSymLink, but the entire symlink chain is followed when the symlinks points to other symlinks.
An exception is thrown if this results in a loop (that is, if more than 25 links are encountered).
| String casa::SymLink::getSymLink | ( | ) | const [private] |
Get the value of the symlink.
Move the symlink to the target path using the system command mv.
The target path can be a directory or a file (as in mv). An exception is thrown if:
- the target directory is not writable
- or the target file already exists and overwrite==False
- or the target file already exists and is not writable
Referenced by move().
| Path casa::SymLink::readSymLink | ( | ) | const |
Read value of a symbolic link and return it as a Path.
If the symlink does not exist, an exception will be thrown. When the symlink points to a file with a relative name, the resulting file name gets prepended by the dirname of the symlink, which is similar to the way a shell handles symlinks. E.g.
ls > subdir/a
ln -s a subdir/b
more subdir/b
The more command shows the results of subdir/a.
| void casa::SymLink::remove | ( | ) |
Remove a symbolic link.
1.7.1