74 lines
1.2 KiB
Ruby
74 lines
1.2 KiB
Ruby
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# This file contains the Ruby code from book of
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# "Data Structures and Algorithms
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# with Object-Oriented Design Patterns in Ruby"
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# by Bruno R. Preiss.
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#
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# Copyright (c) 2004 by Bruno R. Preiss, P.Eng. All rights reserved.
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class BinaryTree < Tree
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def initialize(*args)
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super()
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case args.length
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when 0
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@key = nil
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@left = nil
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@right = nil
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when 1
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@key = args[0]
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@left = BinaryTree.new
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@right = BinaryTree.new
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when 3
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@key = args[0]
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@left = args[1]
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@right = args[2]
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else
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raise ArgumentError
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end
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end
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def purge
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@key = nil
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@left = nil
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@right = nil
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end
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def left
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raise StateError if empty?
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@left
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end
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def right
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raise StateError if empty?
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@right
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end
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def left
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raise StateError if empty?
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@left
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end
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def right
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raise StateError if empty?
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@right
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end
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def compareTo(bt)
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assert { is_a?(obj.type) }
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if empty?
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if bt.empty?
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return 0
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else
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return -1
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end
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elsif bt.empty?
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return 1
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else
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result = @key <=> bt._key
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result = @left <=> bt._left if result == 0
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result = @right <=> bt._right if result == 0
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return result
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end
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end
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end
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