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# A Scan is the scan of a full directory structure with the ability to iterate
# over the results, or return them as a full dataset
#
# results = Scan.new( globs ).run
#
class DirectoryWatcher::Scan
def initialize( globs = Array.new )
@globs = [ globs ].flatten
@results = Array.new
end
# Run the entire scan and collect all the results. The Scan will only ever
# be run once.
#
# Return the array of FileStat results
def run
results
end
# Return the results of the scan. If the scan has not been run yet, then run
# it
def results
@results = collect_all_stats if @results.empty?
return @results
end
#######
private
#######
# Collect all the Stats into an Array and return them
#
def collect_all_stats
r = []
each { |stat| r << stat }
return r
end
# Iterate over each glob, yielding it
#
def each_glob( &block )
@globs.each do |glob|
yield glob
end
end
# Iterate over each item that matches the glob.
# The item yielded is a ::DirectoryWatcher::FileStat object.
#
def each( &block )
each_glob do |glob|
Dir.glob(glob).each do |fn|
if stat = file_stat( fn ) then
yield stat if block_given?
end
end
end
end
# Return the stat of of the file in question. If the item is not a file,
# then return the value of the passed in +if_not_file+
#
def file_stat( fn, if_not_file = false )
stat = File.stat fn
return if_not_file unless stat.file?
return DirectoryWatcher::FileStat.new( fn, stat.mtime, stat.size )
rescue SystemCallError => e
# swallow
$stderr.puts "Error Stating #{fn} : #{e}"
end
end
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