let me explain with an example:
;;in some namespace x
(defprotocol IStemmable
(stem [this token] [this token lang])
(getRoot [this token dictionary]))
(defprotocol IDistance
(getDistance [this s1 s2] [this s1 s2 m-weight]))
;;in some namespace y that refers all vars from x
(extend-type String
IStemmable
(stem
([this] (stem this "english"))
([this lang]
(let [stemmer (help/porter-stemmer lang)]
(doto stemmer
(.setCurrent this)
(.stem))
(.getCurrent stemmer))))
(getRoot [this _ dic] (get dic this "NOT-FOUND!"))
IDistance
(getDistance
([this other]
(help/levenshtein-distance* this other)) ;;delegate to helper fn
([this other mismatch-weight]
(help/levenshtein-distance* this other mismatch-weight)))) ;;same
here
(defrecord PorterStemmer [lang input output] ;;COMPILES AND WORKS FINE -
NO PROBLEMS
IStemmable
(stem [_ token]
(stem token lang)) ;;delegate to String for this
(getRoot [_ token dic]
(getRoot token _ dic)))) ;;delegate to String for this
(defrecord LevenshteinDistance [] ;;DOESN'T COMPILE
IDistance
(getDistance [_ s1 s2]
(getDistance s1 s2)) ;;delegate to String for this
(getDistance [_ s1 s2 weight]
(getDistance s1 s2 weight))) ;;and this
trying to load the file results in:
CompilerException java.lang.IllegalArgumentException: No single method:
getDistance of interface: cluja.protocols.IDistance found for function:
getDistance of protocol: IDistance,
compiling:(/media/sorted/uni_stick/cluja/src/cluja/concretions/models.clj:152:3)
What am I doing wrong? I am practically doing the exact same thing for
these 2 protocols. Both of them delegate to the implementations extended
to string. I keep looking at the code and I see nothing wrong! The
'getDistance' with 3 args delegates to the one with 2 and the one with 4
delegates to the one with 3 (from String)...even more confusingly why
one works and the other complains? any ideas/insights?
Jim
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