Class: Ccp::Persistent::File

Inherits:
Base
  • Object
show all
Defined in:
lib/ccp/persistent/file.rb

Instance Attribute Summary

Attributes inherited from Base

#serializer, #source

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#[], #save

Constructor Details

#initialize(source, serializer) ⇒ File

Returns a new instance of File.



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# File 'lib/ccp/persistent/file.rb', line 8

def initialize(source, serializer)
  @serializer = Ccp::Serializers.lookup(serializer)
  @source     = File.extname(source) == ".#{ext}" ? source : "#{source}.#{ext}"
end

Class Method Details

.ext ⇒ Object 



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# File 'lib/ccp/persistent/file.rb', line 4

def self.ext
  ""
end

Instance Method Details

#[]=(key, val) ⇒ Object 



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# File 'lib/ccp/persistent/file.rb', line 32

def []=(key, val)
  hash = read
  hash[key.to_s] = val
  raw_write(encode(hash))
end

#exist?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ccp/persistent/file.rb', line 13

def exist?(key)
  read.has_key?(key.to_s)
end

#keys ⇒ Object 



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# File 'lib/ccp/persistent/file.rb', line 38

def keys
  read!.keys.sort
end

#load(key) ⇒ Object 



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# File 'lib/ccp/persistent/file.rb', line 26

def load(key)
  load!(key)
rescue Ccp::Persistent::NotFound
  nil
end

#load!(key) ⇒ Object 



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# File 'lib/ccp/persistent/file.rb', line 17

def load!(key)
  hash = read
  if hash.has_key?(key.to_s)
    hash[key.to_s]
  else
    raise Ccp::Persistent::NotFound, key.to_s
  end
end

#path ⇒ Object 



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# File 'lib/ccp/persistent/file.rb', line 46

def path
  @path ||= Pathname(@source)
end

#read ⇒ Object 



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# File 'lib/ccp/persistent/file.rb', line 50

def read
  read!
rescue Ccp::Persistent::NotFound
  {}
end

#read! ⇒ Object 



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# File 'lib/ccp/persistent/file.rb', line 56

def read!
  path.exist? or raise Ccp::Persistent::NotFound, path.to_s
  decode(path.open("rb").read{}).must(Hash)
end

#truncate ⇒ Object 



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# File 'lib/ccp/persistent/file.rb', line 42

def truncate
  File.unlink(path.to_s)
end