Class: QueueBus::Matcher

Inherits:
Object
  • Object
show all
Defined in:
lib/queue_bus/matcher.rb

Overview

Tests whether a field on a bus event matches a filter.

Constant Summary collapse

SPECIAL_PREPEND = 
'bus_special_value_'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hash) ⇒ Matcher 



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# File 'lib/queue_bus/matcher.rb', line 8

def initialize(hash)
  @filters = encode(hash)
end

Instance Attribute Details

#filters ⇒ Object (readonly)

Returns the value of attribute filters.



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# File 'lib/queue_bus/matcher.rb', line 7

def filters
  @filters
end

Instance Method Details

#encode(hash) ⇒ Object 



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# File 'lib/queue_bus/matcher.rb', line 78

def encode(hash)
  out = {}
  hash.each do |key, value|
    case value
    when :key, :blank, :nil, :present, :empty, :value
      value = "#{SPECIAL_PREPEND}#{value}"
    end
    out[key.to_s] = value.to_s
  end
  out
end

#match?(attribute_name, attributes) ⇒ Boolean 



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# File 'lib/queue_bus/matcher.rb', line 16

def match?(attribute_name, attributes)
  mine = filters[attribute_name].to_s
  return false if mine.empty?

  given = attributes[attribute_name]
  case mine
  when "#{SPECIAL_PREPEND}key"
    return true if attributes.key?(attribute_name)

    return false
  when "#{SPECIAL_PREPEND}blank"
    return true if given.to_s.strip.empty?

    return false
  when "#{SPECIAL_PREPEND}empty"
    return false if given.nil?
    return true if given.to_s.empty?

    return false
  when "#{SPECIAL_PREPEND}nil"
    return true if given.nil?

    return false
  when "#{SPECIAL_PREPEND}value"
    return false if given.nil?

    return true
  when "#{SPECIAL_PREPEND}present"
    return true unless given.to_s.strip.empty?

    return false
  end

  given = given.to_s

  return true if mine == given

  begin
    # if it's already a regex, don't mess with it
    # otherwise, it should have start and end line situation
    regex = if mine[0..6] == '(?-mix:'
              Regexp.new(mine)
            else
              Regexp.new("^#{mine}$")
            end
    return !!regex.match(given)
  rescue StandardError
    return false
  end
end

#matches?(attributes) ⇒ Boolean 



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# File 'lib/queue_bus/matcher.rb', line 67

def matches?(attributes)
  return false if filters.empty?
  return false if attributes.nil?

  filters.keys.each do |key|
    return false unless match?(key, attributes)
  end

  true
end

#to_redis ⇒ Object 



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# File 'lib/queue_bus/matcher.rb', line 12

def to_redis
  @filters
end