Class: Archaeo::CdxFilter

Inherits:
Object
  • Object
show all
Defined in:
lib/archaeo/cdx_filter.rb

Overview

Builds and validates CDX Server API filter expressions.

CDX filter format: [!]field:regex The optional ! prefix inverts the match. The field must be a recognized CDX field name. The regex is a Java-compatible regex pattern matched against the field value.

Constant Summary collapse

VALID_FIELDS = 
%w[
  urlkey timestamp original mimetype statuscode
  digest length
].freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(expression) ⇒ CdxFilter

Returns a new instance of CdxFilter.



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# File 'lib/archaeo/cdx_filter.rb', line 16

def initialize(expression)
  @expression = expression.to_s
  validate!
end

Class Method Details

.by_digest(digest) ⇒ Object 



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# File 'lib/archaeo/cdx_filter.rb', line 50

def self.by_digest(digest)
  new("digest:#{digest}")
end

.by_mimetype(type) ⇒ Object 



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# File 'lib/archaeo/cdx_filter.rb', line 42

def self.by_mimetype(type)
  new("mimetype:#{type}")
end

.by_status(code) ⇒ Object 



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# File 'lib/archaeo/cdx_filter.rb', line 34

def self.by_status(code)
  new("statuscode:#{code}")
end

.by_url(pattern) ⇒ Object 



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# File 'lib/archaeo/cdx_filter.rb', line 54

def self.by_url(pattern)
  new("original:#{pattern}")
end

.excluding_mimetype(type) ⇒ Object 



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# File 'lib/archaeo/cdx_filter.rb', line 46

def self.excluding_mimetype(type)
  new("!mimetype:#{type}")
end

.excluding_status(code) ⇒ Object 



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# File 'lib/archaeo/cdx_filter.rb', line 38

def self.excluding_status(code)
  new("!statuscode:#{code}")
end

Instance Method Details

#field ⇒ Object 



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# File 'lib/archaeo/cdx_filter.rb', line 29

def field
  stripped = @expression.delete_prefix("!")
  stripped.split(":", 2).first.to_s
end

#negated? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/archaeo/cdx_filter.rb', line 25

def negated?
  @expression.start_with?("!")
end

#to_s ⇒ Object 



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# File 'lib/archaeo/cdx_filter.rb', line 21

def to_s
  @expression
end