Class: Pipeliner::FilterManager

Inherits:
Object
  • Object
show all
Defined in:
lib/pipeliner/FilterManager.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ FilterManager

Create a new FilterManager



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# File 'lib/pipeliner/FilterManager.rb', line 7

def initialize
    @filters = {}
    @lock = Mutex.new
end

Instance Method Details

#add(type, filter = nil, &block) ⇒ Object

type

Object type to apply filter to

filter

Pipeline::Filter to add

Add a Filter to be applied to the given types



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# File 'lib/pipeliner/FilterManager.rb', line 15

def add(type, filter=nil, &block)
    if((filter.nil? && !block_given?) || (filter && !filter.is_a?(Filter)))
        raise ArgumentError.new('Filter or proc must be provided for filter')
    end
    const = Splib.find_const(type)
    type = const unless const.nil?
    @lock.synchronize do
        @filters[type] ||= {}
    end
    if(block_given?)
        unless(block.arity == 1 || block.arity < 0)
            raise ArgumentError.new('Block must accept a parameter')
        end
        @lock.synchronize do
            @filters[type][:procs] ||= []
            unless(@filters[type][:procs].include?(block))
                @filters[type][:procs] << block
            end
        end
    end
    if(filter)
        @lock.synchronize do
            unless(@filters[type].include?(filter))
                @filters[type][:filters] ||= []
                unless(@filters[type][:filters].include?(filter))
                    @filters[type][:filters] << filter
                end
            end
        end
    end
    filter ? block_given? ? [filter, block] : filter : block
end

#apply_filters(o) ⇒ Object

o

Object to apply filters to

Applies any Filters applicable to object type



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# File 'lib/pipeliner/FilterManager.rb', line 86

def apply_filters(o)
    @filters.keys.find_all{|type| Splib.type_of?(o, type)}.each do |type|
        @filters[type].each_pair do |k,v|
            begin
                case k
                when :filters
                    v.each{|f|o = f.filter(o)}
                when :procs
                    v.each{|pr|o = pr.call(o)}
                end
            rescue ArgumentError
                # ignore this
            end
        end
    end
    o
end

#clear ⇒ Object

Remove all filters



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# File 'lib/pipeliner/FilterManager.rb', line 105

def clear
    @filters.clear
end

#filters(type = nil) ⇒ Object

type

Object types

Return filters of given type or all filters if not type is supplied



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# File 'lib/pipeliner/FilterManager.rb', line 74

def filters(type=nil)
    unless(type)
        @filters.dup
    else
        const = Splib.find_const(type)
        type = const unless const.nil?
        @filters[type] ? @filters[type].dup : nil
    end
end

#remove(filter, type = nil) ⇒ Object

filter

Pipeline::Filter to remove

type

Object type filter is applied to.

Remove Filter from given type. If no type is given all references to the given filter will be removed



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# File 'lib/pipeliner/FilterManager.rb', line 52

def remove(filter, type=nil)
    if(type)
        const = Splib.find_const(type)
        type = const unless const.nil?
    end
    @lock.synchronize do
        (type ? [@filters[type]] : @filters.values).each do |set|
            [:filters, :procs].each do |t|
                if(set[t])
                    set[t].delete_if{|v| v == filter}
                    set.delete(t) if set[t].empty?
                end
            end
        end
        @filters.delete_if{|k,v|v.empty?}
    end
    nil
end