Class: Cassandra::OrderedHash

Inherits:
Hash
  • Object
show all
Defined in:
lib/cassandra/ordered_hash.rb

Overview

Copyright © 2004-2009 David Heinemeier Hansson

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args, &block) ⇒ OrderedHash

Returns a new instance of OrderedHash.



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# File 'lib/cassandra/ordered_hash.rb', line 37

def initialize(*args, &block)
  super
  @keys = []
end

Class Method Details

.[](*array) ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 31

def self.[](*array)
  hash = new
  array.each_slice(2) { |key, value| hash[key] = value }
  hash
end

Instance Method Details

#[]=(key, value) ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 48

def []=(key, value)
  @keys << key if !has_key?(key)
  super
end

#clear ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 103

def clear
  super
  @keys.clear
  self
end

#delete(key) ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 53

def delete(key)
  if has_key? key
    index = @keys.index(key)
    @keys.delete_at index
  end
  super
end

#delete_if ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 61

def delete_if
  super
  sync_keys!
  self
end

#each ⇒ Object Also known as: each_pair 



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# File 'lib/cassandra/ordered_hash.rb', line 97

def each
  @keys.each {|key| yield [key, self[key]]}
end

#each_key ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 89

def each_key
  @keys.each { |key| yield key }
end

#each_value ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 93

def each_value
  @keys.each { |key| yield self[key]}
end

#initialize_copy(other) ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 42

def initialize_copy(other)
  super
  # make a deep copy of keys
  @keys = other.keys
end

#inspect ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 124

def inspect
  "#<OrderedHash #{super}>"
end

#keys ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 77

def keys
  @keys.dup
end

#merge(other_hash) ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 120

def merge(other_hash)
  dup.merge!(other_hash)
end

#merge!(other_hash) ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 115

def merge!(other_hash)
  other_hash.each {|k,v| self[k] = v }
  self
end

#reject(&block) ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 73

def reject(&block)
  dup.reject!(&block)
end

#reject! ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 67

def reject!
  super
  sync_keys!
  self
end

#shift ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 109

def shift
  k = @keys.first
  v = delete(k)
  [k, v]
end

#to_hash ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 85

def to_hash
  self
end

#values ⇒ Object 



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# File 'lib/cassandra/ordered_hash.rb', line 81

def values
  @keys.collect { |key| self[key] }
end