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 26

def ordered_keys
  @ordered_keys
end

Instance Method Details

#[]=(key, value) ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 32

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 79

def clear
  super
  @ordered_keys = []
end

#delete(key, &block) ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 66

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 71

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 38

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 60

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 28

def keys
  @ordered_keys || []
end

#merge(other) ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 47

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 53

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 43

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