Class: OrderedHash

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

Overview

A hash in which the order of keys are preserved.

Under Ruby 1.9 and greater, this class has no added methods because Ruby’s Hash already keeps its keys ordered by order of insertion.

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#ordered_keys ⇒ Object

Returns the value of attribute ordered_keys.



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# File 'lib/mongo/util/ordered_hash.rb', line 36

def ordered_keys
  @ordered_keys
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 23

def ==(other)
  begin
    !other.nil? &&
      keys == other.keys &&
      values == other.values
  rescue
    false
  end
end

#[]=(key, value) ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 42

def []=(key, value)
  @ordered_keys ||= []
  @ordered_keys << key unless @ordered_keys.include?(key)
  super(key, value)
end

#clear ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 89

def clear
  super
  @ordered_keys = []
end

#delete(key, &block) ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 76

def delete(key, &block)
  @ordered_keys.delete(key) if @ordered_keys
  super
end

#delete_if(&block) ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 81

def delete_if(&block)
  self.each { |k,v|
    if yield k, v
      delete(k)
    end
  }
end

#each ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 48

def each
  @ordered_keys ||= []
  @ordered_keys.each { |k| yield k, self[k] }
end

#inspect ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 70

def inspect
  str = '{'
  str << (@ordered_keys || []).collect { |k| "\"#{k}\"=>#{self.[](k).inspect}" }.join(", ")
  str << '}'
end

#keys ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 38

def keys
  @ordered_keys || []
end

#merge(other) ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 57

def merge(other)
  oh = self.dup
  oh.merge!(other)
  oh
end

#merge!(other) ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 63

def merge!(other)
  @ordered_keys ||= []
  @ordered_keys += other.keys # unordered if not an OrderedHash
  @ordered_keys.uniq!
  super(other)
end

#values ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 53

def values
  collect { |k, v| v }
end