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root/cvsroot/COMP/SCRAM/src/URL/URLhandler.pm

Comparing COMP/SCRAM/src/URL/URLhandler.pm (file contents):
Revision 1.6 by williamc, Wed Sep 29 08:56:39 1999 UTC vs.
Revision 1.12 by williamc, Wed Mar 1 11:28:53 2000 UTC

#	Line 1 | Line 1
1	<	# url handler -> returns the location of thefilu&# Interface
1	>	# url handler -> returns the location of the file
2	>	# Interface
3		# ---------
4	<	# new() :
5	<	# new(cachedir)       : A new urlhandler with a defined default cahce directory
6	<	# get(url)            : download from the specified url to the default cache
7	<	# get(url,dirlocation)   : download to the specified directory
4	>	# new(cache)       : A new urlhandler with a defined default cahce directory
5	>	# download(url,[location]) : as get but always download
6	>	# get(url,[location]) : download from the specified url to cache or location
7	>	#                       return the full url path name incl. any base expansion
8	>	#                       and the filename downloaded to
9		# setbase(type,variablehash) : set the url defaults for a specific url type
10	<	#                              arguments are dependenton type
10	>	#                              arguments are dependent on type
11		# unsetbase(type)  : deactivate a previously set base
12	<	# setcache(dir)    : set the default cache location
12	>	# currentbase(type) : return the current base for the given type
13		#
14		# ----------------------------------------------------------------------
13	–	# returns file location - or crashes out
14	–	# can pass a file name for the item to be stored as
15	–	# if not then stores in a default cache.
15
16		package URL::URLhandler;
17		require 5.004;
18		use Utilities::AddDir;
19	<	use URL::URL_base;
19	>	use URL::URLcache;
20	>	use URL::URLclass;
21	>	use URL::URLbase;
22		use Carp;
23
24		sub new {
#	Line 33 | Line 34 | sub init {
34		use Utilities::AddDir;
35		my $self=shift;
36		my $cache=shift;
36	–	if (! defined $cache  ) { $cache="/tmp/SCRAMcache" }; # default cache
37	–	AddDir::adddir($cache);
37		$self->{cache}=$cache;
38	+	$self->{dummybase}=URL::URLbase->new({});
39	+	$self->{cachestore}=$self->{cache}->filestore();
40		use URL::URL_cvs;
41		use URL::URL_cvsfile;
42		use URL::URL_file;
43	+	use URL::URL_filed;
44		$self->{urlmodules}={
45		'cvsfile' => 'URL::URL_cvsfile',
46		'cvs' => 'URL::URL_cvs',
47	<	'file' => 'URL::URL_file'
47	>	'file' => 'URL::URL_file',
48	>	'filed' => 'URL::URL_filed'
49		};
47	–	$self->{filebase}="";
48	–	$self->setbase("file", {}); # Base file as default
50		}
51
52	<	sub setcache {
52	>	sub get {
53		my $self=shift;
54	<	my $cache=shift;
54	>	my $origurl=shift;
55	>	my $file="";
56
57	<	$self->{cache}=$cache;
57	>	my $url=URL::URLclass->new($origurl);
58	>	my $type=$url->type();
59	>	$url->expandurl($self->currentbase($type));
60	>	my $fullurl=$url->url();
61	>
62	>	$file=$self->{cache}->file($fullurl);
63	>	if ( $file eq "" ) {
64	>	($fullurl,$file)=$self->download($origurl, @_);
65	>	}
66	>	return ($fullurl, $file);
67		}
68
69	<	sub get ($@) {
69	>	sub download {
70		my $self=shift;
71	<	my $origurl=shift;
72	<	my $dirname=shift;
73	<	my $rest;
74	<	my $type;
75	<	my $url;
76	<	my $version;
77	<	my $rv="";
78	<
79	<	if ( ! defined $dirname ) {
80	<	$dirname=$self->{cache};
81	<	}
82	<	chdir $dirname or carp "Unable to Enter Directory $dirname $!\n";
83	<	chomp $origurl;
73	<	# get our version info from the url (after last ??)
74	<	( $url, $version) = split /\?\?/, $origurl;
75	<	if ( $url=~/:/ ) {
76	<	($type,$rest) = split /:/, $url;
77	<	}
78	<	else {
79	<	$type='label';
80	<	$rest=$url.":".$version;
81	<	}
82	<	if ( ! ( exists $self->{'urlmodules'}{$type}) ) {
83	<	print "URLhandler: Unsupported type $type\n";
84	<	carp;
85	<	}
86	<	else {
87	<	if ( $#{$self->{urlostack}{$type}} < 0 ) {
88	<	print "URLhandler : base not set for type $type \n";
89	<	}
90	<	else {
91	<	$rv=
92	<	eval{${$self->{urlostack}{$type}}[$#{$self->{urlostack}{$type}}]}->
93	<	get($rest, $dirname);
94	<	}
71	>	my $origurl=shift;
72	>
73	>	# Process the URL string
74	>	my $url=URL::URLclass->new($origurl);
75	>	my $type=$url->type();
76	>	$urltypehandler=$self->_typehandler($type);
77	>	$url->expandurl($self->currentbase($type));
78	>
79	>	# Generate a location name if not provided
80	>	$nocache=1;
81	>	if ( @_ ) {
82	>	$location=shift;
83	>	$nocache=0; # dont cache if downloaded to an external location
84		}
85	<	if ( $rv ne "" ) {
86	<	$rv=$dirname."/".$rv;
85	>	else {
86	>	$location=$self->{cache}->filename($url->url());
87		}
88	<	return $rv;
88	>	# -- get the file from the appropriate handler
89	>	if ( defined $urltypehandler ) {
90	>	# Call the download module
91	>	$file=eval{$urltypehandler->get($url, $location)};
92	>	}
93	>
94	>	# now register it in the cache if successful
95	>	if ( $file && $nocache) {
96	>	$self->{cache}->store($url->url(), $location);
97	>	}
98	>	return ($url->url(), $file);
99		}
100
101		sub setbase {
#	Line 105 | Line 104 | sub setbase {
104		my @args=@_;
105		my $oref;
106
107	<	# Check type is supported
108	<	if ( ! exists $self->{urlmodules}{$type} ) {
109	<	print "URLhandler error: Unsupported type $type\n";
110	<	return 1;
112	<	}
113	<	else {
114	<	# A new URL object - pushed onto the stack
115	<	$oref=eval{$self->{urlmodules}{$type}}->new();
116	<	push @{$self->{urlostack}{$type}}, $oref;
117	<	$oref->setbase(@args);
118	<	}
107	>	$self->checktype($type);
108	>	# make a new base object
109	>	my $base=URL::URLbase->new(@_);
110	>	push @{$self->{"basestack"}{$type}}, $base;
111		}
112
113		sub unsetbase {
#	Line 123 | Line 115 | sub unsetbase {
115		my $type=shift;
116		my $oref;
117
118	<	# Check type is supported
118	>	$self->checktype($type);
119	>	# pop off the stack and call the unset base method
120	>	if ( $#{$self->{basestack}{$type}} >=0 ) {
121	>	my $base=pop @{$self->{basestack}{$type}};
122	>	undef $base;
123	>	}
124	>	else {
125	>	die "URLhandler error: Unable to unset type $type\n";
126	>	}
127	>	# remove the stack if its empty
128	>	if ( $#{$self->{basestack}{$type}} == -1 ) {
129	>	delete $self->{basestack}{$type};
130	>	}
131	>	}
132	>
133	>	sub currentbase {
134	>	my $self=shift;
135	>	my $type=shift;
136	>	my $rv;
137	>
138	>	if ( exists $self->{basestack}{$type} ) {
139	>	$rv=${$self->{basestack}{$type}}[$#{$self->{basestack}{$type}}];
140	>	}
141	>	else {
142	>	$rv=$self->{dummybase};
143	>	}
144	>	return $rv;
145	>	}
146	>
147	>	sub checktype($type) {
148	>	my $self=shift;
149	>	my $type=shift;
150	>
151	>	# Check type is supported
152		if ( ! exists $self->{urlmodules}{$type} ) {
153	<	print "URLhandler error: Unsupported type $type\n";
129	<	return 1;
130	<	}
131	<	else {
132	<	# pop off the stack and call the unset base method
133	<	if ( $#{$self->{urlostack}{$type}} >=0 ) {
134	<	$oref=pop @{$self->{urlostack}{$type}};
135	<	$oref->unsetbase();
136	<	undef $oref;
137	<	}
138	<	else {
139	<	print "URLhandler error: Unable to unset type $type\n";
140	<	return 1;
141	<	}
153	>	die "URLhandler error: Unsupported type $type\n";
154		}
155		}
156
157	<	# ------------------------ General Support Routines ----------------------------
157	>	sub _typehandler {
158	>	my $self=shift;
159	>	my $type=shift;
160	>
161	>	$self->checktype($type);
162
163	<	sub cachefilename {
164	<	my $self=shift;
165	<	use File::Basename;
166	<	use Utilities::AddDir;
167	<	my $filebase=dirname($rest);
168	<	$cache="/tmp/williamc/urlhandler$$";
169	<	adddir($cache);
154	<	$filename=$cache."/".$filebase;
163	>	# instantiate only if it dosnt already exist;
164	>	if ( exists $self->{'urlobjs'}{$type} ) {
165	>	$self->{'urlobjs'}{$type};
166	>	}
167	>	else {
168	>	$self->{'urlobjs'}{$type}=$self->{urlmodules}{$type}->new();
169	>	}
170		}
156	–

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