Class: Ferret::Search::Spans::SpanNotQuery

Inherits:
SpanQuery show all
Defined in:
lib/ferret/search/spans/span_not_query.rb

Overview

Removes matches which overlap with another SpanQuery.

Defined Under Namespace

Classes: SpanNotEnum

Instance Attribute Summary

Attributes inherited from Query

#boost

Instance Method Summary collapse

Methods inherited from SpanQuery

#create_weight

Methods inherited from Query

#combine, #create_weight, #extract_terms, #merge_boolean_queries, #similarity, #weight

Constructor Details

#initialize(incl, excl) ⇒ SpanNotQuery

Construct a SpanNotQuery matching spans from incl which have no overlap with spans from excl.



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# File 'lib/ferret/search/spans/span_not_query.rb', line 6

def initialize(incl, excl) 
  super()
  @incl = incl
  @excl = excl

  if incl.field != excl.field
    raise ArgumentError, "Clauses must have same field."
  end
end

Instance Method Details

#excl ⇒ Object

Return the SpanQuery whose matches must not overlap those returned.



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# File 'lib/ferret/search/spans/span_not_query.rb', line 20

def excl() @excl end

#field ⇒ Object 



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# File 'lib/ferret/search/spans/span_not_query.rb', line 22

def field() @incl.field() end

#incl ⇒ Object

Return the SpanQuery whose matches are filtered.



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# File 'lib/ferret/search/spans/span_not_query.rb', line 17

def incl() @incl end

#rewrite(reader) ⇒ Object 



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# File 'lib/ferret/search/spans/span_not_query.rb', line 107

def rewrite(reader)
  clone = nil

  rewritten_incl = @incl.rewrite(reader)
  if (rewritten_incl != @incl) 
    clone = self.clone()
    clone.incl = rewritten_incl
  end

  rewritten_excl = @excl.rewrite(reader)
  if (rewritten_excl != @excl) 
    clone = self.clone() if (clone == nil)
    clone.excl = rewritten_excl
  end

  if (clone != nil) 
    return clone                        # some clauses rewrote
  else 
    return self                         # no clauses rewrote
  end
end

#spans(reader) ⇒ Object 



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# File 'lib/ferret/search/spans/span_not_query.rb', line 30

def spans(reader)
  return SpanNotEnum.new(self, reader)
end

#terms ⇒ Object 



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# File 'lib/ferret/search/spans/span_not_query.rb', line 24

def terms() @incl.terms() end

#to_s(field = nil) ⇒ Object 



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# File 'lib/ferret/search/spans/span_not_query.rb', line 26

def to_s(field = nil) 
  return "span_not(#{incl.to_s(field)}, #{excl.to_s(field)})"
end