Class: KeywordAttribute

Inherits:
ActiveRecord::Base
  • Object
show all
Defined in:
app/models/keyword_attribute.rb

Constant Summary collapse

StdName =

// standard name space –>

{
  'title' => ['title','subject','long_name','standard_name','name'],
  'description' => ['description'],
  'who' => ['creator','maintainer'],
  'information_url' => [{:conditions => "name = 'information_url' OR ( (name = 'reference' OR name = 'references' ) AND value LIKE 'http://%' ) OR name = 'url'", :order => 'name'}]  # order: information_url > reference% > url
}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.find_by_stdname(name) ⇒ Object 



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# File 'app/models/keyword_attribute.rb', line 18

def self.find_by_stdname(name)
  if aliases=StdName[name]        # substitution, not ==
    strs = Array.new
    has = Array.new
    aliases.each do |expr|
      case expr
      when String
        strs.push expr
      when Hash
        has.push expr
      else
        raise "[BUG] Unsupported expression type #{expr.class}"
      end
    end
    if strs.length > 0
      if ar = find(:first, :conditions => strs.collect{|st| "name='#{st}'"}.join(" OR "))
        return ar
      end
    end
    if has.length > 0
      has.each{|ha|
        if ar = find(:first, ha)
          return ar
        end
      }
    end
  end
  nil
end

.find_by_stdname_or_name(name) ⇒ Object 



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# File 'app/models/keyword_attribute.rb', line 48

def self.find_by_stdname_or_name(name)
  find_by_stdname(name) || find(:first,:conditions=>["name=?",name])
end

.format_value_search(val, mode = :equal, name = "") ⇒ Object 



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# File 'app/models/keyword_attribute.rb', line 79

def self.format_value_search(val, mode=:equal, name="")
  name += "." unless name==""
  allowed = [:equal, :like]
  if !allowed.include?(mode)
    raise ArgumentError,"2nd arg must be one of #{allowed.inspect}"
  end
  case val
  when String
    case mode
    when :like
      "#{name}value LIKE '%#{val}%'"
    when :equal
      "#{name}value = '#{val}'"
    else
      raise "Unsupported mode  #{mode.inspect}"
    end
  when Numeric
    if val.is_a?(Integer)
      tcrange = 1..5    # check all integer- and float-types
    elsif val.is_a?(Float)
      tcrange = 4..5    # check float-types
    else
      raise "Unsupported Numeric type  #{val.class}"
    end
    case mode
    when :like
      exprs = []
      for tc in tcrange
        str = NArray.new(tc,1).fill!(val).hton.to_s
        if connection.adapter_name=="SQLite"
          str.gsub!(/\000/,'%00')
          wild_chr = "*"
          operator = "GLOB"
        else
          str = str.gsub(/_/,'\_').gsub(/%/,'\%')
          wild_chr = "%"
          operator = "LIKE BINARY"
        end
        exprs.push( "#{name}num_value #{operator} '#{tc.to_s}#{wild_chr}#{str}#{wild_chr}'")
      end
      exprs.join(' OR ')
    when :equal
      exprs = []
      for tc in tcrange
        str = NArray.new(tc,1).fill!(val).hton.to_s

        str.gsub!(/\000/,'%00') if connection.adapter_name=="SQLite"
        exprs.push( "#{name}num_value = '" + tc.to_s + str  + "'")

      end
      exprs.join(' OR ')
    else
      raise "Unsupported mode  #{mode.inspect}"
    end
  when NArray
    # :like are treated as :equal here
    str = val.hton.to_s
    str.gsub!(/\000/,'%00') if connection.adapter_name=="SQLite"
    "#{name}num_value = '" + val.typecode.to_s + str + "'"
  end
end

Instance Method Details

#_node ⇒ Object 



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# File 'app/models/keyword_attribute.rb', line 144

alias _node node

#node(reload = false, hash = {}) ⇒ Object 



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# File 'app/models/keyword_attribute.rb', line 145

def node(reload=false, hash={})
  if u = hash[:user]
    return Node.find(node_id, :user=>u)
  else
    return _node(reload)
  end
end

#to_xml(opt) ⇒ Object 



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# File 'app/models/keyword_attribute.rb', line 154

def to_xml(opt)
  opt = opt.dup.update(:except => [:id, :node_id, :value, :num_value])
  super(opt) do |xml|
    xml.value self.value
  end
end

#value ⇒ Object 



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# File 'app/models/keyword_attribute.rb', line 70

def value
  if (buf=num_value) && buf != "NULL"               # substitution into buf, not ==
    v=NArray.to_na(buf[1..-1],buf[0..0].to_i).ntoh  # typecode is one-digit
  else
    v=super
  end
  v
end

#value=(v) ⇒ Object

// support numerical (NArray) attribute values with num_value –>



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# File 'app/models/keyword_attribute.rb', line 56

def value= (v)
  case v
  when String
    super(v)
  when NArray
    raise "Supported typecodes are 1 digit" if v.typecode>=10
          # Currently (narray-0.5), it never happens since typecode<= 8
    self.num_value= v.typecode.to_s + v.hton.to_s
  else
    raise ArgumentError, "Unsupported class for a keyword value: #{v.class} (name=#{name})"
  end
  v
end