Class: OMF::OML::Sequel::Server::Query

Inherits:
Base::LObject
  • Object
show all
Defined in:
lib/omf_oml/sequel/sequel_server.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(queryEl, repoFactory, logger) ⇒ Query

Returns a new instance of Query.



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 39

def initialize(queryEl, repoFactory, logger)
  @queryEl = queryEl
  @repoFactory = repoFactory || RepositoryFactory.new
  @logger = logger || Logger.new(STDOUT)
  @tables = {}
  @lastRel = nil
  @offset = 0
  @limit = 0
  queryEl.children.each do |el|
    @lastRel = parse_el(el, @lastRel)
  end
  if @limit > 0
    @lastRel = @lastRel.limit(@limit, @offset)
  end
end

Class Method Details

.parse(xmls, repoFactory = RepositoryFactory.new, logger = Logger.new(STDOUT)) ⇒ Object 



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 25

def self.parse(xmls, repoFactory = RepositoryFactory.new, logger = Logger.new(STDOUT))
  if xmls.kind_of? String
    doc = REXML::Document.new(xmls)
    root = doc.root
  else
    root = xmls
  end
  unless root.name == 'query'
    raise "XML fragment needs to start with 'query' but does start with '#{root.name}"
  end
  q = self.new(root, repoFactory, logger)
  q.relation
end

Instance Method Details

#convert_to_cols(args) ⇒ Object 



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 185

def convert_to_cols(args)
  args.collect do |arg|
    if arg.kind_of? String
      table = @repository.get_first_table()
      raise "Unknown table for column '#{arg}'" unless table
      table[arg]
    else
      arg
    end
  end
end

#each(&block) ⇒ Object 



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 55

def each(&block)
  # sel_mgr = relation
  # unless sel_mgr.kind_of? SelectionManager
    # raise "Can only be called on SELECT statement"
  # end
  # puts sel_mgr.engine
  relation.each(&block)
end

#parse_arg(pel) ⇒ Object

Return the arguments defined in @parentEl as array



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 137

def parse_arg(pel)
  res = nil
  #col = nil
  pel.children.each do |el|
    if (el.kind_of? REXML::Text)
      val = el.value
      next if val.strip.empty? # skip text between els
      return parse_arg_primitive(pel, val)
    else
      name = el.name.downcase
      case name
      when /col/
        res = parse_column(el)
      when /eq/
        if res.nil?
          raise "Missing 'col' definiton before 'eq'."
        end
        p = parse_args(el)
        unless p.length == 1
          raise "'eq' can only hnadle 1 argument, but is '#{p.inspect}'"
        end
        res = {res => p[0]}
      else
        raise "Need to be 'col' declaration, but is '#{name}'"
      end
    end
  end
  res
end

#parse_arg_primitive(pel, value) ⇒ Object 



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 167

def parse_arg_primitive(pel, value)
  type = pel.attributes['type'] || 'string'
  case type
  when /string/
    value
  when /boolean/
    value.downcase == 'true' || value == '1'
  when /decimal/
    value.to_i
  when /double/
    value.to_f
  when /dateTime/
    Time.xmlschema
  else
    raise "Unknown arg type '#{type}"
  end
end

#parse_args(parentEl) ⇒ Object

Return the arguments defined in @parentEl as array



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 124

def parse_args(parentEl)
  args = []
  parentEl.children.each do |el|
    next if (el.kind_of? REXML::Text)
    unless el.name == 'arg'
      raise "Expected argument definition but got element '#{el.name}"
    end
    args << parse_arg(el)
  end
  args
end

#parse_column(el) ⇒ Object

<col name=‘oml_sender_id’ table=‘iperf_TCP_Info’/>



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 198

def parse_column(el)
  unless colName = el.attributes['name']
    raise "Missing 'name' attribute for 'col' element"
  end
  col = colName
  unless tblName = el.attributes['table']
    raise "Missing 'table' attribute for col '#{colName}'"
  end
  unless @tables.member?(tblName.to_sym)
    raise "Unknown table name '#{tblName}' (#{el})"
  end
  col = "#{tblName}__#{colName}"

  if colAlias = el.attributes['alias']
    col = "#{col}___#{colAlias}"
  end
  col.to_sym
end

#parse_el(el, lastRel) ⇒ Object 



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 74

def parse_el(el, lastRel)
  if (el.kind_of? REXML::Text)
    # skip
    return lastRel
  end
  args = parse_args(el)
  @logger.debug "CHILD #{el.name}"
  # keep the last table for this level to be used
  # to create proper columns.
  # NOTE: This is not fool-proof but we need columns
  # to later resolve the column type.
  #
  name = el.name.downcase
  if lastRel.nil?
    case name
    when /repository/
      lastRel = repo = parse_repository(el)
      @tables = repo.tables
      @logger.debug "Created repository: #{lastRel}"
    else
      raise "Need to start with 'table' declaration, but does with '#{name}'"
    end
  elsif name == 'table'
    lastRel = parse_table(el)
  elsif name == 'project'
    # turn all arguments into proper columns
  #              cols = convert_to_cols(args)
    lastRel = lastRel.select(*args)
  #            elsif lastRel.kind_of?(::Arel::Table) && name  == 'as'
  #              # keep track of all created tables
  #              lastRel = lastRel.alias(*args)
  #              @repository.add_table(args[0], lastRel)
  elsif name == 'skip'
    @offset = args[0].to_i
  elsif name == 'take'
    @limit = args[0].to_i
  else
    @logger.debug "Sending '#{name}' to #{lastRel.class}"
    lastRel = lastRel.send(name, *args)
  end
  @logger.debug "lastRel for <#{el}> is  #{lastRel.class}"
  lastRel
end

#parse_repository(el) ⇒ Object 



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 118

def parse_repository(el)
  @repository = @repoFactory.create_from_xml(el, @logger)
end

#parse_table(el) ⇒ Object 



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 217

def parse_table(el)
  unless name = el.attributes['tname']
    raise "Missing 'tname' attribute for 'table' element"
  end
  if talias = el.attributes['talias']
    name = "#{name}___#{talias}"
    @tables << talias.to_sym
  end

  @repository[name.to_sym]
end

#relation ⇒ Object 



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 64

def relation
  raise "No query defined, yet" unless @lastRel
  @lastRel
end

#rformat ⇒ Object

Requested format for result. Default is ‘xml’



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# File 'lib/omf_oml/sequel/sequel_server.rb', line 70

def rformat
  @queryEl.attributes['rformat'] || 'xml'
end