Class to read the casa general resource files. More...

#include <Aipsrc.h>

Inheritance diagram for casa::Aipsrc:

Static Public Member Functions
static Bool	find (String &value, const String &keyword)

static Bool	findNoHome (String &value, const String &keyword)
static Bool	find (uInt &value, const String &keyword, Int Nname, const String tname[])
	These finds check a (possible) value of the keyword against a list of coded values provided, and return an index into the list (N if not found).
static Bool	find (uInt &value, const String &keyword, const Vector< String > &tname)
static Bool	find (String &value, const String &keyword, const String &deflt)
	This find usually saves you some lines of code, since you can supply the default you want to use when no such keyword is defined.
static Bool	findNoHome (String &value, const String &keyword, const String &deflt)
static Bool	find (uInt &value, const String &keyword, Int Nname, const String tname[], const String &deflt)
static Bool	find (uInt &value, const String &keyword, const Vector< String > &tname, const String &deflt)
static Bool	findDir (String &foundDir, const String &lastPart="", const Vector< String > &prepends=Vector< String >(), const Vector< String > &appends=Vector< String >(), Bool useStds=True)
	Sets foundDir to the first /firstPart/lastPart path that it finds present on the system, where /firstPart comes from, in order, this list: contents of prepends.
static uInt	registerRC (const String &keyword, const String &deflt)
	Functions to register keywords for later use in get() and set().
static uInt	registerRC (const String &keyword, Int Nname, const String tname[], const String &deflt)
static uInt	registerRC (const String &keyword, const Vector< String > &tname, const String &deflt)
static const String &	get (uInt keyword)
	Gets are like find, but using registered integers rather than names.
static const uInt &	get (uInt &code, uInt keyword)
	get for code
static void	set (uInt keyword, const String &deflt)
	Sets allow registered values to be set.
static void	set (uInt keyword, Int Nname, const String tname[], const String &deflt)
static void	set (uInt keyword, const Vector< String > &tname, const String &deflt)
static void	save (uInt keyword)
	Save a registered keyword value to `$HOME/.aipsrc`
static void	save (uInt keyword, const String tname[])
static void	save (uInt keyword, const Vector< String > &tname)
static void	setAipsPath (const String &path=String())
	Set an AIPSPATH that should be used in stead of a global AIPSPATH.
static const String &	aipsRoot ()
	Returns the appropriate AIPS++ or system variable values.
static const String &	aipsArch ()
static const String &	aipsSite ()
static const String &	aipsHost ()
static const String &	aipsHome ()
	Returns: `~/aips++`
static void	reRead ()
	The `reRead()` function, will reinitialise the static maps and read the aipsrc files again.
static Double	lastRead ()
static const Block< String > &	values ()
	The following functions return the full lists of available data.
static const Block< String > &	patterns ()
static void	show (ostream &oStream)
	The following `show()` function, useful for debugging, outputs all keyword/value pairs found.
static void	show ()
	Prints all info on cout.
static uInt	genRestore (Vector< String > &namlst, Vector< String > &vallst, const String &fileList)
	The following set is a general set of functions.
static void	genSave (Vector< String > &namlst, Vector< String > &vallst, const String &fnam)
	Save the names/values in file.
static void	genSet (Vector< String > &namlst, Vector< String > &vallst, const String &nam, const String &val)
	Set (new or overwrite) keyword/value pair.
static Bool	genUnSet (Vector< String > &namlst, Vector< String > &vallst, const String &nam)
	Remove a keyword from list (False if not in list)
static Bool	genGet (String &val, Vector< String > &namlst, Vector< String > &vallst, const String &nam)
	Get the value of a keyword.
Static Protected Member Functions
static Bool	find (String &value, const String &keyword, uInt start)

static uInt	registerRC (const String &keyword, Block< String > &nlst)
	The registration function.
static void	save (const String keyword, const String val)
	Actual saving.
Static Private Member Functions
static void	parse (Bool force=False)
	Read in the aipsrc files, returning the number of lines found.
static void	doParse (String &fileList)
static uInt	genParse (Block< String > &keywordPattern, Block< String > &keywordValue, uInt &fileEnd, const String &fileList)
	The following parse function can be used for any list of files.
static Bool	matchKeyword (uInt &where, const String &keyword, uInt start)
	Locate the right keyword in the static maps.
static const String &	fillAips (const String &nam)
	Fill in root, arch, site, host and home, and return requested nam.
Static Private Attributes
static Mutex	theirMutex
static volatile Bool	doInit
	Indicate files read.
static Double	lastParse
	Last time data was (re)read.
static Block< String >	keywordValue
	List of values belonging to keywords found.
static Block< String >	keywordPattern
	List of patterns deducted from names.
static uInt	fileEnd
	The start of the non-home values.
static String	extAipsPath
	The possibly set external AIPSPATH.
static String	root
	AIPSROOT.
static String	arch
	AIPSARCH.
static String	site
	AIPSSITE.
static String	host
	AIPSHOST.
static String	home
	AIPSHOME.
static String	uhome
	HOME.
static Bool	filled
	Indicate above filled.
static Block< String >	strlst
	String register list.
static Block< String >	nstrlst
static Block< uInt >	codlst
static Block< String >	ncodlst

Detailed Description

Class to read the casa general resource files.

Intended use:

Public interface

 <h3>Review Status</h3><dl><dt>Reviewed By:<dd>wyoung<dt>Date Reviewed:<dd>1996/11/25<dt>Test programs:<dd>tAipsrc</dl>

Prerequisite

None

Etymology

A class for getting values from the casa resource files

Synopsis

The static Aipsrc class can get information from the casa resource files. It has the same functionality as getrc (c program used for aips++ installation scripts).
In addition it acts as a central clearing house between system and software by providing functionality to obtain aips++ system parameters (like AIPSPATH elements), and the possibility of storing system wide information provided by a class for reference by other classes.
The format of a line in a resource file is:

        # Line starting with an # in column 1 is a comment (as is an empty line)
        keyword:   value
        keyword:   value

The keyword (starting at first non-blank) consists in general of keyword fields separated by periods:

        printer.ps.page
        measures.precession.d_interval
        measures.nutation.d_interval

and, by preference, in lower case (but search is case sensitive) with an _ as word-parts separator.
The keyword and value are separated by a :. The value is the string from the first non-whitespace character after the separator to the end of the line. Interpretation of the string is in general the program's responsibility, but special find() calls (see below) exist to aid.
Any part of the keyword string can be replaced by a wildcard * to indicate all values with that structure (e.g. *.d_interval would indicate in the example above both the precession and the nutation d_interval.
A match between a keyword to be found and a keyword in the resource files will be the first match (taking wildcards into account) encountered in the search through the resource files. The resource files to be looked at can be defined in the environment variable CASARCFILES. If undefined, the resource files searched are (in the given order):

      ~/.casarc
      ~/.casa/rc
      ~/.aipsrc
      $AIPSROOT/.aipsrc
      $AIPSHOST/aipsrc
      $AIPSSITE/aipsrc
      $AIPSARCH/aipsrc

It is not an error for any of the aipsrc files to be absent or empty. However, it is an error if HOME has not been set: an exception will occur. AIPSPATH will in general be read from the global environment variables, but can, before any other Aipsrc related call, be set with the setAipsPath() call.
If AIPSPATH is not set in either way, it is set to the home directory.

The basic interaction with the class is with the static keyword match function

 Bool Aipsrc::find(String &result, const String &keyword)

A set of

 Bool AipsrcValue::find(Type &result, const String &keyword, ...)

are available to interpret the string value found. (see AipsrcValue ).
All the find functions have the ability to set a default if there is no match, while also unit conversion is possible.
The Bool return indicates if the keyword was found, and, in the case of the interpretative finds, if an 'important' format error was found (e.g. '+12a' will be accepted as a Double, with a result of '12', since the standard double conversion in >> will produce this result.)
Caution: The search keyword (unlike the file keyword) has no wildcards; The real name should, of course, be looked for;
To aid in other places, the following (static) methods are available to get the requested information (derived from HOME and AIPSPATH, computer system information and/or aipsrc keywords):

const String &Aipsrc::aipsRoot()
const String &Aipsrc::aipsArch()
const String &Aipsrc::aipsSite()
const String &Aipsrc::aipsHost()
const String &Aipsrc::aipsHome() -- ~/aips++

Other, numeric, system information can be found in AipsrcValue .

Given an AIPSPATH of

 /epp/aips++ sun4sol_gnu epping norma

aipsSite will return

 /epp/aips++/sun4sol_gnu/epping

.

The basic find above reacts with the aipsrc files available. If regular access is necessary (e.g. a lot of routines have to check independently a certain integration time limit), keywords can be registered to enable:

fast access with integer code, rather than string
ability to set values from programs if no aipsrc information given (a dynamic default)
update the $HOME/.aipsrc keyword/value list with save()

Tip: The registered value is never equal to zero, hence a zero value can be used to check if registration is done; Also, registering the same keyword twice is safe, and will produce the same value;
When saving a keyword/value pair in $HOME/.aipsrc, the old version is saved in $HOME/.aipsrc.old, before the keyword/value pair is prepended to the file. A limited number of edits of the same keyword is preserved only (default 5, changeable with the user.aipsrc.edit.keep keyword.

Example

     String printerPage;                // result of keyword find
     if(!Aipsrc::find(printerPage, "printer.ps.page")) {        // look for keyword match
       printerPage = "notSet";
     };

A more convenient way of accomplishing the same result is:

       Aipsrc::find(printerPage, "printer.ps.page", "notSet");

Here the final argument is the default to use if the keyword is not found at all.
If you often want to know, dynamically, the current 'printer.ps.page' value, you could do something like:

        static uInt pp = Aipsrc::registerRC("printer.ps.page", "noSet");
        String printerPage = Aipsrc::get(pp);
    // Processing, and maybe somewhere else:
        Aipsrc::set(pp, "nowSet");
    // ..\.
        printerPage = Aipsrc::get(pp);
    // and save it to the <tt>$HOME/.aipsrc</tt> list
        Aipsrc::save(pp);

Motivation

Programs need a way to interact with the aipsrc files.

Thrown Exceptions

AipsError if the environment variables HOME and/or AIPSPATH not set.

Definition at line 218 of file Aipsrc.h.

Member Function Documentation

static const String& casa::Aipsrc::aipsArch ( ) [static]

static const String& casa::Aipsrc::aipsHome ( ) [static]

Returns: ~/aips++

static const String& casa::Aipsrc::aipsHost ( ) [static]

static const String& casa::Aipsrc::aipsRoot ( ) [static]

Returns the appropriate AIPS++ or system variable values.

static const String& casa::Aipsrc::aipsSite ( ) [static]

static void casa::Aipsrc::doParse ( String & fileList ) [static, private]

static const String& casa::Aipsrc::fillAips ( const String & nam ) [static, private]

Fill in root, arch, site, host and home, and return requested nam.

static Bool casa::Aipsrc::find	(	String &	value,
		const String &	keyword
	)		`[static]`

Thrown Exceptions

AipsError if HOME environment variable not set

The find() functions will, given a keyword, return the value with a matched keyword found in the files. If no match found the function will be False. The findNoHome() emulates the -i switch of getrc by bypassing the ~/.aipsrc file.

static Bool casa::Aipsrc::find	(	uInt &	value,
		const String &	keyword,
		Int	Nname,
		const String	tname[]
	)		`[static]`

These finds check a (possible) value of the keyword against a list of coded values provided, and return an index into the list (N if not found).

Matching is minimax, case insensitive. Always better to use the one with default. return is False if no keyword or no match.

static Bool casa::Aipsrc::find	(	uInt &	value,
		const String &	keyword,
		const Vector< String > &	tname
	)		`[static]`

static Bool casa::Aipsrc::find	(	String &	value,
		const String &	keyword,
		const String &	deflt
	)		`[static]`

This find usually saves you some lines of code, since you can supply the default you want to use when no such keyword is defined.

If the return value is False, the keyword was not found and the default was used.

static Bool casa::Aipsrc::find	(	uInt &	value,
		const String &	keyword,
		Int	Nname,
		const String	tname[],
		const String &	deflt
	)		`[static]`

static Bool casa::Aipsrc::find	(	uInt &	value,
		const String &	keyword,
		const Vector< String > &	tname,
		const String &	deflt
	)		`[static]`

static Bool casa::Aipsrc::find	(	String &	value,
		const String &	keyword,
		uInt	start
	)		`[static, protected]`

Actual find function

static Bool casa::Aipsrc::findDir	(	String &	foundDir,
		const String &	lastPart = `""`,
		const Vector< String > &	prepends = `Vector< String >()`,
		const Vector< String > &	appends = `Vector< String >()`,
		Bool	useStds = `True`
	)		`[static]`

Sets foundDir to the first /firstPart/lastPart path that it finds present on the system, where /firstPart comes from, in order, this list: contents of prepends.

useStd ? (., aipsHome(), aipsRoot()) : ()
contents of appends

static Bool casa::Aipsrc::findNoHome	(	String &	value,
		const String &	keyword
	)		`[static]`

static Bool casa::Aipsrc::findNoHome	(	String &	value,
		const String &	keyword,
		const String &	deflt
	)		`[static]`

static Bool casa::Aipsrc::genGet	(	String &	val,
		Vector< String > &	namlst,
		Vector< String > &	vallst,
		const String &	nam
	)		`[static]`

Get the value of a keyword.

static uInt casa::Aipsrc::genParse	(	Block< String > &	keywordPattern,
		Block< String > &	keywordValue,
		uInt &	fileEnd,
		const String &	fileList
	)		`[static, private]`

The following parse function can be used for any list of files.

It will return the list of Patterns and values found, and the last keyword number of first file in list.

static uInt casa::Aipsrc::genRestore	(	Vector< String > &	namlst,
		Vector< String > &	vallst,
		const String &	fileList
	)		`[static]`

The following set is a general set of functions.

Read aipsrc type files (without wildcards), and return the unique names and values in the Vector arguments. The return value is number of names.

static void casa::Aipsrc::genSave	(	Vector< String > &	namlst,
		Vector< String > &	vallst,
		const String &	fnam
	)		`[static]`

Save the names/values in file.

static void casa::Aipsrc::genSet	(	Vector< String > &	namlst,
		Vector< String > &	vallst,
		const String &	nam,
		const String &	val
	)		`[static]`

Set (new or overwrite) keyword/value pair.

static Bool casa::Aipsrc::genUnSet	(	Vector< String > &	namlst,
		Vector< String > &	vallst,
		const String &	nam
	)		`[static]`

Remove a keyword from list (False if not in list)

static const String& casa::Aipsrc::get ( uInt keyword ) [static]

Gets are like find, but using registered integers rather than names.

Reimplemented in casa::AipsrcValue_Bool< Bool >, casa::AipsrcVector_Bool< Bool >, casa::AipsrcValue< T >, casa::AipsrcVector_String< String >, and casa::AipsrcVector< T >.

static const uInt& casa::Aipsrc::get	(	uInt &	code,
		uInt	keyword
	)		`[static]`

get for code

static Double casa::Aipsrc::lastRead ( ) [static]

static Bool casa::Aipsrc::matchKeyword	(	uInt &	where,
		const String &	keyword,
		uInt	start
	)		`[static, private]`

Locate the right keyword in the static maps.

static void casa::Aipsrc::parse ( Bool force = False ) [static, private]

Read in the aipsrc files, returning the number of lines found.

static const Block<String>& casa::Aipsrc::patterns ( ) [static]

static uInt casa::Aipsrc::registerRC	(	const String &	keyword,
		const String &	deflt
	)		`[static]`

Functions to register keywords for later use in get() and set().

The returned value is the index for get() and set().

static uInt casa::Aipsrc::registerRC	(	const String &	keyword,
		Int	Nname,
		const String	tname[],
		const String &	deflt
	)		`[static]`

static uInt casa::Aipsrc::registerRC	(	const String &	keyword,
		const Vector< String > &	tname,
		const String &	deflt
	)		`[static]`

static uInt casa::Aipsrc::registerRC	(	const String &	keyword,
		Block< String > &	nlst
	)		`[static, protected]`

The registration function.

static void casa::Aipsrc::reRead ( ) [static]

The reRead() function, will reinitialise the static maps and read the aipsrc files again.

It could be useful in some interactive or multi-processor circumstances. lastRead() returns the time last reRead.

static void casa::Aipsrc::save ( uInt keyword ) [static]

Save a registered keyword value to $HOME/.aipsrc

Reimplemented in casa::AipsrcValue_Bool< Bool >, casa::AipsrcValue< T >, casa::AipsrcVector_Bool< Bool >, casa::AipsrcVector_String< String >, and casa::AipsrcVector< T >.

static void casa::Aipsrc::save	(	uInt	keyword,
		const String	tname[]
	)		`[static]`

static void casa::Aipsrc::save	(	uInt	keyword,
		const Vector< String > &	tname
	)		`[static]`

static void casa::Aipsrc::save	(	const String	keyword,
		const String	val
	)		`[static, protected]`

Actual saving.

static void casa::Aipsrc::set	(	uInt	keyword,
		const String &	deflt
	)		`[static]`

Sets allow registered values to be set.

static void casa::Aipsrc::set	(	uInt	keyword,
		Int	Nname,
		const String	tname[],
		const String &	deflt
	)		`[static]`

static void casa::Aipsrc::set	(	uInt	keyword,
		const Vector< String > &	tname,
		const String &	deflt
	)		`[static]`

static void casa::Aipsrc::setAipsPath ( const String & path = String() ) [static]

Set an AIPSPATH that should be used in stead of a global AIPSPATH.

This call should be made before any Aipsrc related call. The AIPSPATH will have up to 4 fields (which can all be empty) giving the root, host, site and arch directory that will be searched for possible [.]aipsrc files.

static void casa::Aipsrc::show ( ostream & oStream ) [static]

The following show() function, useful for debugging, outputs all keyword/value pairs found.

static void casa::Aipsrc::show ( ) [static]

Prints all info on cout.

static const Block<String>& casa::Aipsrc::values ( ) [static]

The following functions return the full lists of available data.

They could be useful for debugging purposes.