Class: DeltaHash

Inherits:
Object
  • Object
show all
Defined in:
lib/hammer_cli_import/deltahash.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hash) ⇒ DeltaHash

Returns a new instance of DeltaHash.



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# File 'lib/hammer_cli_import/deltahash.rb', line 33

def initialize(hash)
  @old = hash
  @new = {}
  @del = Set.new
end

Instance Attribute Details

#del ⇒ Object (readonly)

Returns the value of attribute del.



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# File 'lib/hammer_cli_import/deltahash.rb', line 27

def del
  @del
end

#new ⇒ Object (readonly)

Returns the value of attribute new.



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# File 'lib/hammer_cli_import/deltahash.rb', line 26

def new
  @new
end

Class Method Details

.[](hash) ⇒ Object 



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# File 'lib/hammer_cli_import/deltahash.rb', line 29

def self.[](hash)
  new(hash)
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/hammer_cli_import/deltahash.rb', line 39

def [](key)
  return nil if @del.include? key
  @new[key] || @old[key]
end

#[]=(key, val) ⇒ Object

Raises:



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# File 'lib/hammer_cli_import/deltahash.rb', line 44

def []=(key, val)
  raise DeltaHashError, 'Key exists' if self[key]
  @del.delete key
  @new[key] = val unless @old[key] == val
end

#changed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hammer_cli_import/deltahash.rb', line 82

def changed?
  ! (@new.empty? && del.empty?)
end

#delete(key) ⇒ Object

Raises:



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# File 'lib/hammer_cli_import/deltahash.rb', line 58

def delete(key)
  raise DeltaHashError, "Key #{key} does not exist" unless self[key]
  @del << key if @old[key]
  @new.delete(key)
end

#delete_value(value) ⇒ Object 



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# File 'lib/hammer_cli_import/deltahash.rb', line 64

def delete_value(value)
  deleted = 0
  to_hash.each do |k, v|
    next unless v == value
    delete(k)
    deleted += 1
  end
  return deleted
end

#inspect ⇒ Object 



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# File 'lib/hammer_cli_import/deltahash.rb', line 78

def inspect
  to_hash.inspect
end

#to_hash ⇒ Object 



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# File 'lib/hammer_cli_import/deltahash.rb', line 50

def to_hash
  ret = (@old.merge @new)
  @del.each do |key|
    ret.delete key
  end
  ret
end

#to_s ⇒ Object 



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# File 'lib/hammer_cli_import/deltahash.rb', line 74

def to_s
  to_hash.to_s
end