Class: RDF::Tabular::Row

Inherits:
Object
  • Object
show all
Defined in:
lib/rdf/tabular/metadata.rb

Overview

Wraps each resulting row

Defined Under Namespace

Classes: Cell

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(row, metadata, number, source_number, **options) ⇒ Row

Parameters:

  • row (Array<Array<String>>)
  • metadata (Metadata) —

    for Table

  • number (Integer) —

    1-based row number after skipped/header rows

  • source_number (Integer) —

    1-based row number from source

  • options (Hash{Symbol => Object}) —

    ({})

Options Hash (**options):

  • :validate (Boolean) —

    check for PK/FK consistency



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# File 'lib/rdf/tabular/metadata.rb', line 2036

def initialize(row, metadata, number, source_number, **options)
  @table = metadata
  @number = number
  @sourceNumber = source_number
  @values = []
  skipColumns = metadata.dialect.skipColumns.to_i

  @context = table.context.dup
  @context.base = table.url

  # Create values hash
  # SPEC CONFUSION: are values pre-or-post conversion?
  map_values = {"_row" => number, "_sourceRow" => source_number}

  columns = metadata.tableSchema.columns ||= []
  non_virtual_columns = columns.reject(&:virtual)

  if row.length < non_virtual_columns.length
    raise Error, "Row #{source_number} has #{row.length} columns, expected #{non_virtual_columns.length}"
  end

  # Make sure that the row length is at least as long as the number of column definitions, to implicitly include virtual columns
  columns.each_with_index {|c, index| row[index] ||= c.null}

  row.each_with_index do |value, index|

    next if index < skipColumns

    cell_errors = []

    # create column if necessary
    columns[index - skipColumns] ||=
      Column.new({}, **options.merge(table: metadata, parent: metadata.tableSchema, number: index + 1 - skipColumns))

    column = columns[index - skipColumns]

    @values << cell = Cell.new(metadata, column, self, value)

    datatype = column.datatype || Datatype.new({base: "string"}, **options.merge(parent: column))
    value = value.gsub(/\r\n\t/, ' ') unless %w(string json xml html anyAtomicType).include?(datatype.base)
    value = value.strip.gsub(/\s+/, ' ') unless %w(string json xml html anyAtomicType normalizedString).include?(datatype.base)
    # if the resulting string is an empty string, apply the remaining steps to the string given by the default property
    value = column.default || '' if value.empty?

    cell_values = column.separator ? value.split(column.separator) : [value]

    cell_values = cell_values.map do |v|
      v = v.strip unless %w(string anyAtomicType).include?(datatype.base)
      v = column.default || '' if v.empty?
      if Array(column.null).include?(v)
        nil
      else
        expanded_dt = datatype.id || metadata.context.expand_iri(datatype.base, vocab: true)
        if (lit_or_errors = value_matching_datatype(v.dup, datatype, expanded_dt, column.lang)).is_a?(RDF::Literal)
          lit_or_errors
        else
          cell_errors += lit_or_errors
          RDF::Literal(v, language: (column.lang unless column.lang == "und"))
        end
      end
    end.compact

    # Check for required values
    if column.required && (cell_values.any? {|v| v.to_s.empty?} || cell_values.empty?)
      cell_errors << "Required column has empty value(s): #{cell_values.map(&:to_s).inspect}"
    end
    cell.value = (column.separator ? cell_values : cell_values.first)
    cell.errors = cell_errors

    map_values[columns[index - skipColumns].name] = (column.separator ? cell_values.map(&:to_s) : cell_values.first.to_s)
  end

  # Record primaryKey if validating
  @primaryKey = @values.
    select {|cell| Array(table.tableSchema.primaryKey).include?(cell.column.name)} if options[:validate]

  # Record any row titles
  @titles = @values.
    select {|cell| Array(table.tableSchema.rowTitles).include?(cell.column.name)}.
    map(&:value)

  # Map URLs for row
  @values.each_with_index do |cell, index|
    mapped_values = map_values.merge(
      "_name" => CGI.unescape(cell.column.name),
      "_column" => cell.column.number,
      "_sourceColumn" => cell.column.sourceNumber
    )
    cell.set_urls(mapped_values, options[:decode_uri])
  end
end

Instance Attribute Details

#context ⇒ JSON::LD::Context (readonly)

Context from Table with base set to table URL for expanding URI Templates

Returns:

  • (JSON::LD::Context) 


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# File 'lib/rdf/tabular/metadata.rb', line 2026

def context
  @context
end

#number ⇒ Integer (readonly)

Row number of this row

Returns:

  • (Integer) 


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# File 'lib/rdf/tabular/metadata.rb', line 2002

def number
  @number
end

#primaryKey ⇒ Array<Cell> (readonly)

Cells providing a unique row identifier

Returns:



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# File 'lib/rdf/tabular/metadata.rb', line 2016

def primaryKey
  @primaryKey
end

#sourceNumber ⇒ Integer (readonly)

Row number of this row from the original source

Returns:

  • (Integer) 


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# File 'lib/rdf/tabular/metadata.rb', line 2006

def sourceNumber
  @sourceNumber
end

#table ⇒ Table (readonly)

Table containing this row

Returns:



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# File 'lib/rdf/tabular/metadata.rb', line 2011

def table
  @table
end

#titles ⇒ Array<RDF::Literal> (readonly)

Title(s) of this row

Returns:

  • (Array<RDF::Literal>) 


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# File 'lib/rdf/tabular/metadata.rb', line 2021

def titles
  @titles
end

#values ⇒ Object (readonly)

Row values, hashed by ‘name`



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# File 'lib/rdf/tabular/metadata.rb', line 1998

def values
  @values
end

Instance Method Details

#id ⇒ RDF::URI

Identifier for this row, as an RFC7111 fragment

Returns:

  • (RDF::URI) 


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# File 'lib/rdf/tabular/metadata.rb', line 2130

def id;
  u = table.url.dup
  u.fragment = "row=#{self.sourceNumber}"
  u
end

#inspect ⇒ Object 



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# File 'lib/rdf/tabular/metadata.rb', line 2148

def inspect
  self.class.name + to_atd.inspect
end

#to_atd ⇒ Object

Return Annotated Row representation



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# File 'lib/rdf/tabular/metadata.rb', line 2137

def to_atd
  {
    "@id" => id.to_s,
    "@type" => "Row",
    "table" => (table.id || table.url),
    "number" => self.number,
    "sourceNumber" => self.sourceNumber,
    "cells" => @values.map(&:value)
  }.delete_if {|k,v| v.nil?}
end