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casacore::Path Class Reference

Path name of a file. More...

#include <Path.h>

Public Member Functions

 Path ()
 Default constructor, the path is set to. More...
 
 Path (const String &pathName)
 Construct a path with the given name. More...
 
 Path (const Path &that)
 Copy constructor, copy semantics. More...
 
 ~Path ()
 Destructor. More...
 
Pathoperator= (const Path &that)
 Assignment, copy semantics. More...
 
void append (const String &string)
 Append a string to the path name. More...
 
const StringoriginalName () const
 Returns the string as given at construction. More...
 
const StringexpandedName () const
 Return a string giving the expanded pathname. More...
 
const StringabsoluteName () const
 Return the string which giving the absolute pathname. More...
 
String resolvedName () const
 Return the realpath which is the absolute pathname with possible symlinks resolved. More...
 
Bool isValid () const
 Check if pathname is valid. More...
 
Bool isStrictlyPosix () const
 Check if pathname is valid according the POSIX standard. More...
 
uInt length () const
 Return length of path name. More...
 
uInt maxLength () const
 Return the maximum length a path name can have. More...
 
String baseName () const
 Return the basename of the path; this is only the name of the file. More...
 
String dirName () const
 Return the dirname of the path; this is the directory where the filename is found. More...
 

Static Public Member Functions

static String stripDirectory (const String &name, const String &otherName)
 Strip otherName from this name. More...
 
static String addDirectory (const String &name, const String &otherName)
 If the name starts with. More...
 

Private Member Functions

String expandName (const String &inString) const
 This function is used by expandedName to replace the tilde and to expand the environment variables. More...
 
String makeAbsoluteName (const String &inString) const
 This function is used by absoluteName to make a name absolute, this means that the name is described from the root. More...
 
String removeDots (const String &inString) const
 Remove. More...
 
void getNextName (const String &inString, uInt &count) const
 This function is used by expandName and absoluteName. More...
 

Static Private Member Functions

static uInt getMaxPathNameSize ()
 Define the maximum number of bytes in a pathname This definition does not use Posix values. More...
 
static uInt getMaxNameSize ()
 Define the maximum number of bytes in a filename This definition does not use Posix values. More...
 

Private Attributes

String itsOriginalPathName
 Strings to describe the pathname in three different ways. More...
 
String itsAbsolutePathName
 These variables are pointer to strings because the functions which use these variables are const functions. More...
 
String itsExpandedPathName
 

Detailed Description

Path name of a file.

Review Status

Reviewed By:
UNKNOWN
Date Reviewed:
before2004/08/25

Prerequisite

Etymology

The term 'path' is the standard term for describing the location of a file in a hierarchy of possibly nested directories. In order to find a particular file you must travel a specific path strating from a known point. We use the term in its standard sense in this class.

Synopsis

This class can be used to describe a pathname. One can also create, validate, parse (get base or directory names or original, expanded or absolute names), query and append strings. The client programmer can give a string, at construction, which describes a path. This string can be a relative or an absolute name. Environment variables and a tilde (with or without user name) can also be used in the string and will be expanded by the function expandedName.
The function Once a Path has been constructed, you can query the object for its original name, expanded name, absolute name, the name of the directory where it is found or the name of only the file. Expanding the path name means that possible environment variables and tilde get expanded. There are also functions to get the length or maximum length of a path. Pathnames can also be checked on correctness and they can be checked if they conform the POSIX standard.

Example

In this example a few pathnames are created.

Path test1("~/test/$TEST1/.."); // absolute path
Path test2("/$HOME/./analyse"); // absolute path
Path test3("myFile"); // relative path
cout << test1.originalName() << endl;
// Test1 is according the POSIX standard
if (test1.isStrictlyPosix()){
cout << "test1 is strictly POSIX << endl;
}
// Test1 is valid
if (test1.isValid()){
cout << test1.isValid() << endl;
}
// if "TEST1=$TEST2 and TEST2=$TEST1"(recursive environment variables)
// an exception will be thrown. ~ is replaced by the homedirectory
cout << test1.expandedName() << endl;
// $HOME is expanded
cout << test2.expandedName() << endl;
cout << test1.absoluteName() << endl;
cout << test2.absoluteName() << endl;
cout << test2.baseName() << endl;
cout << test1.dirName() << endl;
cout << test3.originalName() << endl; // myFile is returned
cout << test3.expandedName() << endl; // Nothing is changed
cout << test3.absoluteName() << endl; // The current working directory
is placed before 'myFile'
cout << test3.baseName() << endl; // The current working directory
// is returned
cout << test3.dirName() << endl; // myFile is returned

Motivation

Programmer convenience and (eventually) OS independence.

To Do

Definition at line 126 of file Path.h.

Constructor & Destructor Documentation

casacore::Path::Path ( )

Default constructor, the path is set to.

(working directory).

casacore::Path::Path ( const String pathName)

Construct a path with the given name.

When the name is empty, it is set to. (working directory). It is not checked if the path name is valid. Function isValid() can be used for that purpose.

casacore::Path::Path ( const Path that)

Copy constructor, copy semantics.

casacore::Path::~Path ( )

Destructor.

Member Function Documentation

const String& casacore::Path::absoluteName ( ) const

Return the string which giving the absolute pathname.

It is generated from the expanded pathname by adding the working directory when needed.

static String casacore::Path::addDirectory ( const String name,
const String otherName 
)
static

If the name starts with.

/./ add otherName to it. If the name ends with /. strip name from otherName and return the remainder. If the name starts with./ add the directory of otherName to it. It is the opposite of stripDirectory.

void casacore::Path::append ( const String string)

Append a string to the path name.

When the current path does not end with a / and the string to append does not start with a /, an intermediate / is also added.

String casacore::Path::baseName ( ) const

Return the basename of the path; this is only the name of the file.

It takes it from the expanded path name.

String casacore::Path::dirName ( ) const

Return the dirname of the path; this is the directory where the filename is found.

It takes it from the expanded path name.
To get the absolute dirname one could do:

Path tmpPath (myPath.dirName());
String absDir (tmpPath.absoluteName());

or

Path tmpPath (myPath.absoluteName());
String absDir (tmpPath.dirName());
const String& casacore::Path::expandedName ( ) const

Return a string giving the expanded pathname.

This means that the environment variables are expanded and the tilde is replaced by the home directory. An expanded name can still be a relative path. An exception is thrown when converting a recursive environment variable results in an endless loop (that is, more than 25 substitutions).

String casacore::Path::expandName ( const String inString) const
private

This function is used by expandedName to replace the tilde and to expand the environment variables.

static uInt casacore::Path::getMaxNameSize ( )
staticprivate

Define the maximum number of bytes in a filename This definition does not use Posix values.

static uInt casacore::Path::getMaxPathNameSize ( )
staticprivate

Define the maximum number of bytes in a pathname This definition does not use Posix values.

void casacore::Path::getNextName ( const String inString,
uInt count 
) const
private

This function is used by expandName and absoluteName.

It sets the integer "count" on the next slash or on the end of a string

Bool casacore::Path::isStrictlyPosix ( ) const

Check if pathname is valid according the POSIX standard.

This function checks for double slashes, non-printable characters,pathname length and filename lenghts, all according to the POSIX-standard.

Bool casacore::Path::isValid ( ) const

Check if pathname is valid.

This function checks for: double slashes, non-printable characters, pathname length and filename lengths, this function is more OS-specific.

uInt casacore::Path::length ( ) const

Return length of path name.

String casacore::Path::makeAbsoluteName ( const String inString) const
private

This function is used by absoluteName to make a name absolute, this means that the name is described from the root.

uInt casacore::Path::maxLength ( ) const

Return the maximum length a path name can have.

Path& casacore::Path::operator= ( const Path that)

Assignment, copy semantics.

const String & casacore::Path::originalName ( ) const
inline

Returns the string as given at construction.

Definition at line 265 of file Path.h.

References itsOriginalPathName.

String casacore::Path::removeDots ( const String inString) const
private

Remove.

and.. from the path name. Also multiple slashes are replaced by a single.

String casacore::Path::resolvedName ( ) const

Return the realpath which is the absolute pathname with possible symlinks resolved.

It also resolves //, /./, /../ and trailing /.
The path must be an existing file or directory. It uses the system's realpath function. In case it fails, an exception is thrown.

static String casacore::Path::stripDirectory ( const String name,
const String otherName 
)
static

Strip otherName from this name.

If stripped, the result gets a leading././ If not stripped, it is tried if name can be stripped from otherName. If stripped, the result gets a trailing /. If still not stripped, it is tried to strip the directory of otherName. If that succeeds, the result gets a leading./ This is used by RefTable and TableKeyword to ensure that the name of a subtable or referenced table is always relative to the main table.

Member Data Documentation

String casacore::Path::itsAbsolutePathName
mutableprivate

These variables are pointer to strings because the functions which use these variables are const functions.

This means that they would not be able to modify the string, now they can.

Definition at line 236 of file Path.h.

String casacore::Path::itsExpandedPathName
mutableprivate

Definition at line 237 of file Path.h.

String casacore::Path::itsOriginalPathName
private

Strings to describe the pathname in three different ways.

Definition at line 232 of file Path.h.

Referenced by originalName().


The documentation for this class was generated from the following file: