Class: Amazon::Util::FilterChain

Inherits:
Object
  • Object
show all
Defined in:
lib/amazon/util/filter_chain.rb

Overview

A class for managing around style interceptors, which can be used to implement a decorator design pattern.

Defined Under Namespace

Classes: Filter

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ FilterChain

Returns a new instance of FilterChain.



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# File 'lib/amazon/util/filter_chain.rb', line 29

def initialize()
  @filters = []
end

Instance Attribute Details

#filters ⇒ Object (readonly)

Returns the value of attribute filters.



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# File 'lib/amazon/util/filter_chain.rb', line 27

def filters
  @filters
end

Instance Method Details

#add(name = nil, *filter_params, &filter_block) ⇒ Object 



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# File 'lib/amazon/util/filter_chain.rb', line 41

def add( name=nil, *filter_params, &filter_block )
  add_filter( Filter.new( name, filter_params, filter_block ) )
end

#add_filter(filter) ⇒ Object 



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# File 'lib/amazon/util/filter_chain.rb', line 45

def add_filter( filter )
  if !filter.name.nil?
    @filters.each_with_index { |existing_filter,i|
      if filter.name == existing_filter.name
        @filters[i] = filter
        return
      end
    }
  end
  @filters << filter
end

#execute(*block_params, &block) ⇒ Object 



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# File 'lib/amazon/util/filter_chain.rb', line 33

def execute( *block_params, &block )
  if @filters.size == 0
    block.call( *block_params )
  else
    create_chain( @filters, 0, block, block_params ).call
  end 
end

#remove(name) ⇒ Object 



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# File 'lib/amazon/util/filter_chain.rb', line 57

def remove( name )
  @filters.delete_if { |filter| name == filter.name }
end

#remove_all ⇒ Object 



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# File 'lib/amazon/util/filter_chain.rb', line 61

def remove_all()
  @filters.clear
end