calling java static member using string?
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Daniel Meneses Báez
Aug 13, 2013, 6:14:13 PM8/13/13
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Hi :)
I really want to know if there is a way to do this:
(ns ...
(:import [java.util Calendar]))
(defsomething ;; if it is possible using a macro I'm ok with that
calendar-member
[member]
(symbol (str "Calendar/" member)))
what I want to know if an instance of Calendar "isMonday", "isFriday" "isSunday" etc...
so I was thinking to write something like
(defn- isss [day instant]
(= (.get instant Calendar/DATE) (calendar-member day)))
and then use it like (def is-friday (partial isss 'FRIDAY)) ;;
am I being to crazy?
btw I'm really loving the language.
--
Daniel Meneses Báez
I really want to know if there is a way to do this:
(ns ...
(:import [java.util Calendar]))
(defsomething ;; if it is possible using a macro I'm ok with that
calendar-member
[member]
(symbol (str "Calendar/" member)))
what I want to know if an instance of Calendar "isMonday", "isFriday" "isSunday" etc...
so I was thinking to write something like
(defn- isss [day instant]
(= (.get instant Calendar/DATE) (calendar-member day)))
and then use it like (def is-friday (partial isss 'FRIDAY)) ;;
am I being to crazy?
btw I'm really loving the language.
--
Daniel Meneses Báez
Daniel Meneses Báez
Aug 13, 2013, 6:31:34 PM8/13/13
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ok I'm trying
CompilerException java.lang.NoSuchFieldException: s, compiling:(NO_SOURCE_PATH:1:1)
user> (defmacro is [s instant]
`(= (.get ~instant Calendar/DAY_OF_WEEK)
(. Calendar ~s)))
#'user/is
user> (is 'TUESDAY (Calendar/getInstance))
CompilerException java.lang.RuntimeException: Unable to resolve symbol: TUESDAY in this context, compiling:(NO_SOURCE_PATH:1:1)
user>
user>
user> (defmacro is [s instant]
`(= (.get ~instant Calendar/DAY_OF_WEEK)
(. Calendar ~s)))
#'user/is
user> (defmacro is [s instant]
`(= (.get ~instant Calendar/DAY_OF_WEEK)
(. Calendar (symbol ~s))))
#'user/is
user> (is "TUESDAY" (Calendar/getInstance))
CompilerException java.lang.IllegalArgumentException: No matching method: symbol, compiling:(NO_SOURCE_PATH:1:1)
user>
isn't working :[
CompilerException java.lang.NoSuchFieldException: s, compiling:(NO_SOURCE_PATH:1:1)
user> (defmacro is [s instant]
`(= (.get ~instant Calendar/DAY_OF_WEEK)
(. Calendar ~s)))
#'user/is
user> (is 'TUESDAY (Calendar/getInstance))
CompilerException java.lang.RuntimeException: Unable to resolve symbol: TUESDAY in this context, compiling:(NO_SOURCE_PATH:1:1)
user>
user>
user> (defmacro is [s instant]
`(= (.get ~instant Calendar/DAY_OF_WEEK)
(. Calendar ~s)))
#'user/is
user> (defmacro is [s instant]
`(= (.get ~instant Calendar/DAY_OF_WEEK)
(. Calendar (symbol ~s))))
#'user/is
user> (is "TUESDAY" (Calendar/getInstance))
CompilerException java.lang.IllegalArgumentException: No matching method: symbol, compiling:(NO_SOURCE_PATH:1:1)
user>
isn't working :[
--
Daniel Meneses Báez
Daniel Meneses Báez
Sean Corfield
Aug 13, 2013, 8:21:39 PM8/13/13
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Perhaps clj-time might help you?
https://github.com/clj-time/clj-time
(ns time.core
(:require [clj-time.core :as time]
[clj-time.local :as local]
[clj-time.predicates :as p]))
(p/monday? (time/now)) ;; false
(p/tuesday? (time/now)) ;; false
(p/wednesday? (time/now)) ;; true (for me in California since (time/now) is UTC)
(p/monday? (local/local-now)) ;; false
(p/tuesday? (local/local-now)) ;; true (for me)
(p/wednesday? (local/local-now)) ;; false (not yet in California)
Sean
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--
Sean A Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/
World Singles, LLC. -- http://worldsingles.com/
"Perfection is the enemy of the good."
-- Gustave Flaubert, French realist novelist (1821-1880)
https://github.com/clj-time/clj-time
(ns time.core
(:require [clj-time.core :as time]
[clj-time.local :as local]
[clj-time.predicates :as p]))
(p/monday? (time/now)) ;; false
(p/tuesday? (time/now)) ;; false
(p/wednesday? (time/now)) ;; true (for me in California since (time/now) is UTC)
(p/monday? (local/local-now)) ;; false
(p/tuesday? (local/local-now)) ;; true (for me)
(p/wednesday? (local/local-now)) ;; false (not yet in California)
Sean
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--
Sean A Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/
World Singles, LLC. -- http://worldsingles.com/
"Perfection is the enemy of the good."
-- Gustave Flaubert, French realist novelist (1821-1880)
Daniel Meneses
Aug 14, 2013, 11:19:22 AM8/14/13
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Hi!
Thanks for your answer Sean I got it solved using clj-time
Also I found the problem with my macro attempt
Thanks for your answer Sean I got it solved using clj-time
Also I found the problem with my macro attempt
user> (defmacro is
[s instant]
`(= (.get ~instant Calendar/DAY_OF_WEEK)
(. Calendar ~s)))
#'current-day.core/is
user> (is FRIDAY (Calendar/getInstance))
false
user> (is WEDNESDAY (Calendar/getInstance))
true
I was quoting the symbol !!
user> (is FRIDAY (Calendar/getInstance))
false
user> (is WEDNESDAY (Calendar/getInstance))
true
I was quoting the symbol !!
Jim - FooBar();
Aug 14, 2013, 11:33:19 AM8/14/13
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why on earth is this a macro and not a
regular fn?
Jim
Jim
Daniel Meneses Báez
Aug 14, 2013, 11:45:38 AM8/14/13
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I don't know if you have a differente approach, but as a defn it doesn't work
user> (import '[java.util Calendar])
java.util.Calendar
user> (defn is [s instant]
(= (.get instant Calendar/DAY_OF_WEEK)
(. Calendar s)))
CompilerException java.lang.NoSuchFieldException: s, compiling:(NO_SOURCE_PATH:3:12)
user> (import '[java.util Calendar])
java.util.Calendar
user> (defn is [s instant]
(= (.get instant Calendar/DAY_OF_WEEK)
(. Calendar s)))
CompilerException java.lang.NoSuchFieldException: s, compiling:(NO_SOURCE_PATH:3:12)
user> (defmacro is [s instant]
`(= (.get ~instant Calendar/DAY_OF_WEEK)
(. Calendar ~s)))
#'user/is
user> (is WEDNESDAY (Calendar/getInstance))
true
I think that when you declare this as a function it will it attempt to validate that Calendar has an 's' member, at this point that is an error, on the other hand when the macro gets replaced the generated form is valid.
just for the fun of it, I got this working:
user> (defmacro is [s]
`#(= (.get % Calendar/DAY_OF_WEEK)
(. Calendar ~s)))
#'user/is
user> ((is WEDNESDAY) (Calendar/getInstance))
true
now I can write what I had in mind
user> (def is-friday (is FRIDAY))
#'user/is-friday
user> (is-friday (Calendar/getInstance))
false
user> (def is-wednesday (is WEDNESDAY))
#'user/is-wednesday
user> (is-wednesday (Calendar/getInstance))
true
cool xD
just for the fun of it, I got this working:
user> (defmacro is [s]
`#(= (.get % Calendar/DAY_OF_WEEK)
(. Calendar ~s)))
#'user/is
user> ((is WEDNESDAY) (Calendar/getInstance))
true
now I can write what I had in mind
user> (def is-friday (is FRIDAY))
#'user/is-friday
user> (is-friday (Calendar/getInstance))
false
user> (def is-wednesday (is WEDNESDAY))
#'user/is-wednesday
user> (is-wednesday (Calendar/getInstance))
true
cool xD
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Daniel Meneses Báez
Dave Della Costa
Aug 14, 2013, 12:14:33 PM8/14/13
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I know you said clj-time solved this for you, but here's another way to
handle it which avoids using a macro (using a map of keywords to
java.util.Calendar weekday enums for convenience and to be more
Clojure-esque, but it isn't necessary):
user=> (def weekdays {:mon Calendar/MONDAY :tues Calendar/TUESDAY :wed
Calendar/WEDNESDAY :thurs Calendar/THURSDAY :fri Calendar/FRIDAY :sat
Calendar/SATURDAY :sun Calendar/SUNDAY})
#'user/weekdays
user=> (defn is-day-of-week? [day-enum] (= Calendar/DAY_OF_WEEK
(day-enum weekdays)))
#'user/is-day-of-week?
user=> (is-day-of-week? :sat)
false
user=> (is-day-of-week? :wed)
true
user=>
You don't need to use all the Java interop syntax you're using, you can
refer to and compare these static fields directly. In the end these are
simply Integer comparisons.
DD
>> https://github.com/clj-time/__clj-time
>> > For more options, visit
>> https://groups.google.com/__groups/opt_out
>> <https://groups.google.com/groups/opt_out>.
> Daniel Meneses B�ez
handle it which avoids using a macro (using a map of keywords to
java.util.Calendar weekday enums for convenience and to be more
Clojure-esque, but it isn't necessary):
user=> (def weekdays {:mon Calendar/MONDAY :tues Calendar/TUESDAY :wed
Calendar/WEDNESDAY :thurs Calendar/THURSDAY :fri Calendar/FRIDAY :sat
Calendar/SATURDAY :sun Calendar/SUNDAY})
#'user/weekdays
user=> (defn is-day-of-week? [day-enum] (= Calendar/DAY_OF_WEEK
(day-enum weekdays)))
#'user/is-day-of-week?
user=> (is-day-of-week? :sat)
false
user=> (is-day-of-week? :wed)
true
user=>
You don't need to use all the Java interop syntax you're using, you can
refer to and compare these static fields directly. In the end these are
simply Integer comparisons.
DD
>> <https://github.com/clj-time/clj-time>
>>
>> (ns time.core
>> (:require [clj-time.core :as time]
>> [clj-time.local :as local]
>> [clj-time.predicates :as p]))
>>
>> (p/monday? (time/now)) ;; false
>> (p/tuesday? (time/now)) ;; false
>> (p/wednesday? (time/now)) ;; true (for me in California since
>> (time/now) is UTC)
>>
>> (p/monday? (local/local-now)) ;; false
>> (p/tuesday? (local/local-now)) ;; true (for me)
>> (p/wednesday? (local/local-now)) ;; false (not yet in California)
>>
>> Sean
>>
>> On Tue, Aug 13, 2013 at 3:14 PM, Daniel Meneses B�ez
>>
>> (ns time.core
>> (:require [clj-time.core :as time]
>> [clj-time.local :as local]
>> [clj-time.predicates :as p]))
>>
>> (p/monday? (time/now)) ;; false
>> (p/tuesday? (time/now)) ;; false
>> (p/wednesday? (time/now)) ;; true (for me in California since
>> (time/now) is UTC)
>>
>> (p/monday? (local/local-now)) ;; false
>> (p/tuesday? (local/local-now)) ;; true (for me)
>> (p/wednesday? (local/local-now)) ;; false (not yet in California)
>>
>> Sean
>>
>> <dap...@gmail.com> wrote:
>> > Hi :)
>> >
>> > I really want to know if there is a way to do this:
>> >
>> > (ns ...
>> > (:import [java.util Calendar]))
>> >
>> > (defsomething ;; if it is possible using a macro I'm ok with
>> that
>> > calendar-member
>> > [member]
>> > (symbol (str "Calendar/" member)))
>> >
>> > what I want to know if an instance of Calendar "isMonday",
>> "isFriday"
>> > "isSunday" etc...
>> >
>> > so I was thinking to write something like
>> >
>> > (defn- isss [day instant]
>> > (= (.get instant Calendar/DATE) (calendar-member day)))
>> >
>> > and then use it like (def is-friday (partial isss 'FRIDAY)) ;;
>> >
>> > am I being to crazy?
>> >
>> > btw I'm really loving the language.
>> >
>> >
>> >
>> > --
>> > Daniel Meneses B�ez
>> > Hi :)
>> >
>> > I really want to know if there is a way to do this:
>> >
>> > (ns ...
>> > (:import [java.util Calendar]))
>> >
>> > (defsomething ;; if it is possible using a macro I'm ok with
>> that
>> > calendar-member
>> > [member]
>> > (symbol (str "Calendar/" member)))
>> >
>> > what I want to know if an instance of Calendar "isMonday",
>> "isFriday"
>> > "isSunday" etc...
>> >
>> > so I was thinking to write something like
>> >
>> > (defn- isss [day instant]
>> > (= (.get instant Calendar/DATE) (calendar-member day)))
>> >
>> > and then use it like (def is-friday (partial isss 'FRIDAY)) ;;
>> >
>> > am I being to crazy?
>> >
>> > btw I'm really loving the language.
>> >
>> >
>> >
>> > --
>> >
>> > --
>> > --
>> > You received this message because you are subscribed to the
>> Google
>> > Groups "Clojure" group.
>> > To post to this group, send email to clo...@googlegroups.com
>> > Note that posts from new members are moderated - please be
>> patient with your
>> > first post.
>> > To unsubscribe from this group, send email to
>> > clojure+u...@__googlegroups.com
>> > --
>> > --
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>> <http://groups.google.com/group/clojure?hl=en>
>> > ---
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>> >
>> >
>>
>>
>>
>> --
>> Sean A Corfield -- (904) 302-SEAN
>> An Architect's View -- http://corfield.org/
>> World Singles, LLC. -- http://worldsingles.com/
>>
>> "Perfection is the enemy of the good."
>> -- Gustave Flaubert, French realist novelist (1821-1880)
>>
>> --
>> --
>> You received this message because you are subscribed to the Google
>> Groups "Clojure" group.
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>> <mailto:clo...@googlegroups.com>
>> >
>>
>>
>>
>> --
>> Sean A Corfield -- (904) 302-SEAN
>> An Architect's View -- http://corfield.org/
>> World Singles, LLC. -- http://worldsingles.com/
>>
>> "Perfection is the enemy of the good."
>> -- Gustave Flaubert, French realist novelist (1821-1880)
>>
>> --
>> --
>> You received this message because you are subscribed to the Google
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>> To post to this group, send email to clo...@googlegroups.com
>> Note that posts from new members are moderated - please be patient
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>> <mailto:clojure+u...@googlegroups.com>
>> with your first post.
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>
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>>
>>
>
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> Daniel Meneses B�ez
Daniel Meneses Báez
Aug 14, 2013, 12:43:15 PM8/14/13
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m... the function you wrote only returns true on saturdays
but I get the point!
thanks for your answer
but I get the point!
thanks for your answer
On Wed, Aug 14, 2013 at 12:14 PM, Dave Della Costa <ddell...@gmail.com> wrote:
I know you said clj-time solved this for you, but here's another way to
handle it which avoids using a macro (using a map of keywords to
java.util.Calendar weekday enums for convenience and to be more
Clojure-esque, but it isn't necessary):
user=> (def weekdays {:mon Calendar/MONDAY :tues Calendar/TUESDAY :wed
Calendar/WEDNESDAY :thurs Calendar/THURSDAY :fri Calendar/FRIDAY :sat
Calendar/SATURDAY :sun Calendar/SUNDAY})
#'user/weekdays
user=> (defn is-day-of-week? [day-enum] (= Calendar/DAY_OF_WEEK
(day-enum weekdays)))
#'user/is-day-of-week?
user=> (is-day-of-week? :sat)
false
user=> (is-day-of-week? :wed)
true
user=>
You don't need to use all the Java interop syntax you're using, you can
refer to and compare these static fields directly. In the end these are
simply Integer comparisons.
DD
>> On Tue, Aug 13, 2013 at 3:14 PM, Daniel Meneses Báez
>> <dap...@gmail.com> wrote:
>> > Hi :)
>> >
>> > I really want to know if there is a way to do this:
>> >
>> > (ns ...
>> > (:import [java.util Calendar]))
>> >
>> > (defsomething ;; if it is possible using a macro I'm ok with
>> that
>> > calendar-member
>> > [member]
>> > (symbol (str "Calendar/" member)))
>> >
>> > what I want to know if an instance of Calendar "isMonday",
>> "isFriday"
>> > "isSunday" etc...
>> >
>> > so I was thinking to write something like
>> >
>> > (defn- isss [day instant]
>> > (= (.get instant Calendar/DATE) (calendar-member day)))
>> >
>> > and then use it like (def is-friday (partial isss 'FRIDAY)) ;;
>> >
>> > am I being to crazy?
>> >
>> > btw I'm really loving the language.
>> >
>> >
>> >
>> > --
>> > Daniel Meneses Báez
> Daniel Meneses Báez
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Daniel Meneses Báez
Jim - FooBar();
Aug 14, 2013, 12:46:03 PM8/14/13
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On 14/08/13 16:45, Daniel Meneses B�ez wrote:
> (defn is [s instant]
> (= (.get instant Calendar/DAY_OF_WEEK)
> (. Calendar s)))
(def ^:private day->int
> (defn is [s instant]
> (= (.get instant Calendar/DAY_OF_WEEK)
> (. Calendar s)))
{:MONDAY 2 :TUESDAY 3 :WEDNESDAY 4 :THURSDAY 5 :FRIDAY 6 :SATURDAY 7
:SUNDAY 1})
(defn is-today?
([s instant]
(= (.get instant Calendar/DAY_OF_WEEK)
((keyword s) day->int)))
([s]
(is s (Calendar/getInstance)))
([]
(let [int-id (.get (Calendar/getInstance) Calendar/DAY_OF_WEEK)]
(->> (some (fn [[k v]] (when (= v int-id) k)) day->int)
str
(drop 1)
(apply str)
symbol))) )
(is-today? 'WEDNESDAY)
=> true
(is-today? MONDAY)
=> false
(is-today?)
=> WEDNESDAY
Jim
Jim - FooBar();
Aug 14, 2013, 1:17:15 PM8/14/13
to clo...@googlegroups.com
and the non-reflective version which also fixes the typos and the
inefficient transform from keyword -> symbol.
(def ^:private day->int
{:MONDAY 2 :TUESDAY 3 :WEDNESDAY 4 :THURSDAY 5 :FRIDAY 6 :SATURDAY 7
:SUNDAY 1})
(defn is-today?
([s ^java.util.GregorianCalendar instant]
([]
(let [inst (Calendar/getInstance)
int-id (.get inst Calendar/DAY_OF_WEEK)]
symbol))) )
(is-today? (is-today?))
=> true
Jim
inefficient transform from keyword -> symbol.
(def ^:private day->int
{:MONDAY 2 :TUESDAY 3 :WEDNESDAY 4 :THURSDAY 5 :FRIDAY 6 :SATURDAY 7
:SUNDAY 1})
(defn is-today?
(= (.get instant Calendar/DAY_OF_WEEK)
((keyword s) day->int)))
([s]
(is-today? s (Calendar/getInstance)))
((keyword s) day->int)))
([s]
([]
(let [inst (Calendar/getInstance)
int-id (.get inst Calendar/DAY_OF_WEEK)]
(-> (some (fn [[k v]] (when (= v int-id) k)) day->int)
name
symbol))) )
(is-today? (is-today?))
=> true
Jim
Dave Della Costa
Aug 14, 2013, 1:26:58 PM8/14/13
to clo...@googlegroups.com
Sorry, somehow I got the wrong line pasted in there! Should be:
user=> (defn is-day-of-week? [day-enum] (= (.get (Calendar/getInstance)
Calendar/DAY_OF_WEEK) (day-enum weekdays)))
...but you probably figured that out. ;-)
DD
> >> > Daniel Meneses B�ez
> >> > For more options, visit
> >> <mailto:clojure+u...@googlegroups.com
> <mailto:clojure%252Buns...@googlegroups.com>>
> <mailto:clojure%252Buns...@googlegroups.com>>.
> > Daniel Meneses B�ez
> Daniel Meneses B�ez
user=> (defn is-day-of-week? [day-enum] (= (.get (Calendar/getInstance)
Calendar/DAY_OF_WEEK) (day-enum weekdays)))
...but you probably figured that out. ;-)
DD
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