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Size: 1.6 KB
Versions: 13
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Stored size: 1.6 KB
Contents
######################################
# WARNING! Highly expiremental code! #
######################################
# TITLE:
#
# RWDelegator
#
# SUMMARY:
#
# Read from one object and write to another.
#
# COPYRIGHT:
#
# Copyright (c) 2005 Thomas Sawyer
#
# LICENSE:
#
# Ruby License
#
# This module is free software. You may use, modify, and/or redistribute this
# software under the same terms as Ruby.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.
#
# AUTHORS:
#
# - Thomas Sawyer
# = RWDelegator
#
# Read from one object and write to another.
class RWDelegator
def initialize( write, &read )
@read = read
@write = write
# ensure other classes can deduce equality.
read_class = @read.call.object_class
unless read_class.method_defined?(:eq_with_rwdelegator?)
read_class.class_eval %{
def eq_with_rwdelegator?( other )
if RWDelegator === other
other == self
else
eq_without_rwdelegator?(other)
end
end
alias_method :eq_without_rwdelegator?, :==
alias_method :==, :eq_with_rwdelegator?
}
end
end
def inspect
"#<#{object_class} #{@read.call.inspect}>"
end
def ==( other )
@read.call == other
end
def method_missing( meth, *args, &blk )
read = @read.call
ditto = read.dup
result = ditto.send( meth, *args, &blk )
if ditto != read
result = @write.send( meth, *args, &blk )
end
result
end
end
Version data entries
13 entries across 13 versions & 1 rubygems