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# Graph::Reader - perl base class for Graph file format readers |
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# |
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package Graph::Reader; |
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use strict; |
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use warnings; |
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our $VERSION = '2.07'; |
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use IO::File; |
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use Graph; |
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87024
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#======================================================================= |
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# |
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# new () - constructor |
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# |
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#======================================================================= |
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sub new |
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{ |
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my $class = shift; |
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1
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my %args = @_; |
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1
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die "don't create an instance of $class!\n" if $class eq __PACKAGE__; |
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0
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my $self = bless {}, $class; |
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0
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$self->_init(\%args); |
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0
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return $self; |
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} |
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#======================================================================= |
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# |
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# _init() - initialise instance |
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# |
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# This is for any instance-specific initialisation. The idea is that |
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# a sub-class will define an _init() method if it needs one. |
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# For future compatibility the class-specific method should invoke |
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# this. |
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# |
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#======================================================================= |
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sub _init |
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{ |
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} |
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#======================================================================= |
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# |
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# read_graph() - create a Graph and read the given file into it |
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# |
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# This is the public method that will be invoked to read a graph. |
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# The file can be specified either as a filename, or a filehandle. |
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# |
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#======================================================================= |
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sub read_graph |
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{ |
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0
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0
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1
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my $self = shift; |
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0
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my $filename = shift; |
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60
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0
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my $graph = Graph->new(); |
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0
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my $FILE; |
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0
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0
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if (ref $filename) |
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{ |
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0
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$self->_read_graph($graph, $filename); |
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} |
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else |
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{ |
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0
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$FILE = IO::File->new("< $filename"); |
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0
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0
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if (not defined $FILE) |
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{ |
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0
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warn "couldn't read from $filename: $!\n"; |
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0
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return 0; |
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} |
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0
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$self->_read_graph($graph, $FILE); |
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0
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$FILE->close(); |
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} |
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80
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0
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return $graph; |
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} |
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83
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1; |
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85
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__END__ |