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# url handler -> returns the location of the file
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#
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# Interface
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# ---------
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# new() :
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# new(cachedir) : A new urlhandler with a defined default cahce directory
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# get(url) : download from the specified url to the default cache
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# get(url,dirlocation) : download to the specified directory
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# setbase(type,@args) : set the url defaults for a specific url type
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# arguments are dependent on type
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# http:
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# file:
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# cvs: servername,servertype [ ,user,passkey ]
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# label:
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# unsetbase(type) : deactivate a previously set base
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#
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# ----------------------------------------------------------------------
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# returns file location - or crashes out
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# can pass a file name for the item to be stored as
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# if not then stores in a default cache.
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package URLhandler;
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require 5.004;
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use Utilities::AddDir;
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use URL::URL_base;
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use Carp;
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sub new {
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my $class=shift;
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my $cache=shift;
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$self={};
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bless $self, $class;
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$self->init($cache);
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return $self;
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}
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sub init {
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use Utilities::AddDir;
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my $self=shift;
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my $cache=shift;
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if (! defined $cache ) { $cache="/tmp/SCRAMcache" }; # default cache
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AddDir::adddir($cache);
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$self->{cache}=$cache;
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use URL::URL_cvs;
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use URL::URL_file;
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$self->{urlmodules}={
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'cvs' => 'URL_cvs',
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'file' => 'URL_file'
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};
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$self->{filebase}="";
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$self->setbase("file", {}); # Base file as default
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}
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sub get ($@) {
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my $self=shift;
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my $origurl=shift;
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my $dirname=shift;
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my $rest;
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my $type;
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my $url;
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my $version;
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if ( ! defined $dirname ) {
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$dirname=$self->{cache};
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}
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chdir $dirname or carp "Unable to Enter Directory $dirname $!\n";
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chomp $origurl;
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# get our version info from the url (after last ??)
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( $url, $version) = split /\?\?/, $origurl;
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if ( $url=~/:/ ) {
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($type,$rest) = split /:/, $url;
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}
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else {
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$type='label';
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$rest=$url.":".$version;
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}
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if ( ! ( exists $self->{'urlmodules'}{$type}) ) {
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print "URLhandler: Unsupported type $type\n";
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carp;
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}
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else {
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print "Debug : type=$type , number of elements=".$#{$self->{urlostack}{$type}}." ".${$self->{urlostack}{$type}}[$#{$self->{urlostack}{$type}}]."\n";
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if ( $#{$self->{urlostack}{$type}} < 0 ) {
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print "URLhandler : base not set for type $type \n";
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}
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else {
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eval{${$self->{urlostack}{$type}}[$#{$self->{urlostack}{$type}}]}->
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get($rest);
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}
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}
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}
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sub setbase {
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my $self=shift;
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my $type=shift;
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my @args=@_;
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my $oref;
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# Check type is supported
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if ( ! exists $self->{urlmodules}{$type} ) {
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print "URLhandler error: Unsupported type $type\n";
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return 1;
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}
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else {
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# A new URL object - pushed onto the stack
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$oref=eval{$self->{urlmodules}{$type}}->new();
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push @{$self->{urlostack}{$type}}, $oref;
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print "Debug : Setting type=$type to $oref $#{$self->{urlostack}{$type}}\n";
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$oref->setbase(@args);
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}
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}
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sub unsetbase {
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my $self=shift;
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my $type=shift;
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my $oref;
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print " Debug : Unsetting base type $type\n";
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# Check type is supported
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if ( ! exists $self->{urlmodules}{$type} ) {
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print "URLhandler error: Unsupported type $type\n";
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return 1;
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}
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else {
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# pop off the stack and call the unset base method
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if ( $#{$self->{urlostack}{$type}} >=0 ) {
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$oref=pop @{$self->{urlostack}{$type}};
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$oref->unsetbase();
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undef $oref;
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}
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else {
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print "URLhandler error: Unable to unset type $type\n";
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return 1;
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}
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}
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}
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# ------------------------ General Support Routines ----------------------------
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sub cachefilename {
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my $self=shift;
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use File::Basename;
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use Utilities::AddDir;
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my $filebase=dirname($rest);
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$cache="/tmp/williamc/urlhandler$$";
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adddir($cache);
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$filename=$cache."/".$filebase;
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}
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