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 32

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)
  !other.nil? &&
    keys == other.keys &&
    values == other.values
end

#[]=(key, value) ⇒ Object 



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

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 85

def clear
  super
  @ordered_keys = []
end

#delete(key, &block) ⇒ Object 



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# File 'lib/mongo/util/ordered_hash.rb', line 72

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 77

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 44

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 66

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 34

def keys
  @ordered_keys || []
end

#merge(other) ⇒ Object 



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

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 59

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 49

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