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

Comparing COMP/SCRAM/src/URL/URLhandler.pm (file contents):
Revision 1.5 by williamc, Wed Sep 29 07:29:16 1999 UTC vs.
Revision 1.14 by williamc, Thu May 18 14:57:30 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;
40	–	use URL::URL_cvsfile;
41		use URL::URL_file;
42	+	use URL::URL_test;
43		$self->{urlmodules}={
43	–	'cvsfile' => 'URL::URL_cvsfile',
44		'cvs' => 'URL::URL_cvs',
45	<	'file' => 'URL::URL_file'
45	>	'file' => 'URL::URL_file',
46	>	'test' => 'URL::URL_test'
47		};
47	–	$self->{filebase}="";
48	–	$self->setbase("file", {}); # Base file as default
48		}
49
50	<	sub setcache {
50	>	sub get {
51		my $self=shift;
52	<	my $cache=shift;
52	>	my $origurl=shift;
53	>	my $file="";
54
55	<	$self->{cache}=$cache;
55	>	my $url=URL::URLclass->new($origurl);
56	>	my $type=$url->type();
57	>	$url->expandurl($self->currentbase($type));
58	>	my $fullurl=$url->url();
59	>
60	>	$file=$self->{cache}->file($fullurl);
61	>	if ( $file eq "" ) {
62	>	($fullurl,$file)=$self->download($origurl, @_);
63	>	}
64	>	return ($fullurl, $file);
65		}
66
67	<	sub get ($@) {
67	>	sub download {
68		my $self=shift;
69	<	my $origurl=shift;
70	<	my $dirname=shift;
71	<	my $rest;
72	<	my $type;
73	<	my $url;
74	<	my $version;
75	<	my $rv="";
76	<
77	<	if ( ! defined $dirname ) {
78	<	$dirname=$self->{cache};
79	<	}
80	<	chdir $dirname or carp "Unable to Enter Directory $dirname $!\n";
81	<	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);
94	<	}
69	>	my $origurl=shift;
70	>
71	>	# Process the URL string
72	>	my $url=URL::URLclass->new($origurl);
73	>	my $type=$url->type();
74	>	$urltypehandler=$self->_typehandler($type);
75	>	$url->expandurl($self->currentbase($type));
76	>
77	>	# Generate a location name if not provided
78	>	$nocache=1;
79	>	if ( @_ ) {
80	>	$location=shift;
81	>	$nocache=0; # dont cache if downloaded to an external location
82		}
83	<	if ( $rv ne "" ) {
84	<	$rv=$dirname."/".$rv;
83	>	else {
84	>	$location=$self->{cache}->filename($url->url());
85		}
86	<	return $rv;
86	>	# -- get the file from the appropriate handler
87	>	if ( defined $urltypehandler ) {
88	>	# Call the download module
89	>	$file=eval{$urltypehandler->get($url, $location)};
90	>	}
91	>
92	>	# now register it in the cache if successful
93	>	if ( $file && $nocache) {
94	>	$self->{cache}->store($url->url(), $location);
95	>	}
96	>	return ($url->url(), $file);
97		}
98
99		sub setbase {
#	Line 105 | Line 102 | sub setbase {
102		my @args=@_;
103		my $oref;
104
105	<	# Check type is supported
106	<	if ( ! exists $self->{urlmodules}{$type} ) {
107	<	print "URLhandler error: Unsupported type $type\n";
108	<	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	<	}
105	>	$self->checktype($type);
106	>	# make a new base object
107	>	my $base=URL::URLbase->new(@_);
108	>	push @{$self->{"basestack"}{$type}}, $base;
109		}
110
111		sub unsetbase {
#	Line 123 | Line 113 | sub unsetbase {
113		my $type=shift;
114		my $oref;
115
116	<	# Check type is supported
116	>	$self->checktype($type);
117	>	# pop off the stack and call the unset base method
118	>	if ( $#{$self->{basestack}{$type}} >=0 ) {
119	>	my $base=pop @{$self->{basestack}{$type}};
120	>	undef $base;
121	>	}
122	>	else {
123	>	die "URLhandler error: Unable to unset type $type\n";
124	>	}
125	>	# remove the stack if its empty
126	>	if ( $#{$self->{basestack}{$type}} == -1 ) {
127	>	delete $self->{basestack}{$type};
128	>	}
129	>	}
130	>
131	>	sub currentbase {
132	>	my $self=shift;
133	>	my $type=shift;
134	>	my $rv;
135	>
136	>	if ( exists $self->{basestack}{$type} ) {
137	>	$rv=${$self->{basestack}{$type}}[$#{$self->{basestack}{$type}}];
138	>	}
139	>	else {
140	>	$rv=$self->{dummybase};
141	>	}
142	>	return $rv;
143	>	}
144	>
145	>	sub checktype($type) {
146	>	my $self=shift;
147	>	my $type=shift;
148	>
149	>	# Check type is supported
150		if ( ! exists $self->{urlmodules}{$type} ) {
151	<	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	<	}
151	>	die "URLhandler error: Unsupported type $type\n";
152		}
153		}
154
155	<	# ------------------------ General Support Routines ----------------------------
155	>	sub _typehandler {
156	>	my $self=shift;
157	>	my $type=shift;
158	>
159	>	$self->checktype($type);
160
161	<	sub cachefilename {
162	<	my $self=shift;
163	<	use File::Basename;
164	<	use Utilities::AddDir;
165	<	my $filebase=dirname($rest);
166	<	$cache="/tmp/williamc/urlhandler$$";
167	<	adddir($cache);
154	<	$filename=$cache."/".$filebase;
161	>	# instantiate only if it dosnt already exist;
162	>	if ( exists $self->{'urlobjs'}{$type} ) {
163	>	$self->{'urlobjs'}{$type};
164	>	}
165	>	else {
166	>	$self->{'urlobjs'}{$type}=$self->{urlmodules}{$type}->new();
167	>	}
168		}
156	–

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