{"id":8422,"date":"2012-09-24T23:39:54","date_gmt":"2012-09-24T18:09:54","guid":{"rendered":"http:\/\/www.tothenew.com\/blog\/?p=8422"},"modified":"2012-09-25T02:20:15","modified_gmt":"2012-09-24T20:50:15","slug":"gdsl-awesomeness-delegating-closure-calls","status":"publish","type":"post","link":"https:\/\/www.tothenew.com\/blog\/gdsl-awesomeness-delegating-closure-calls\/","title":{"rendered":"GDSL Awesomeness – Delegating Closure Calls"},"content":{"rendered":"

hi,<\/p>\n

 <\/p>\n

Very often we use delegates in our closure calls. It would be great if we could get code-hinting in the closure via the delegates.<\/p>\n

 <\/p>\n

Now let us take a very simple scenario, where we made a method “with” which delegates the delegate objet to closure and runs it.
\n[java]<\/p>\n

class Delegator {
\n static def runWith(obj, Closure cl) {
\n cl.delegate = obj
\n cl.call()
\n }
\n}<\/p>\n

Delegator.runWith(new MyDelegate()) {
\n myDelegateMethod()
\n def prop = myDlegateProperty
\n \/\/ And so on we can access delegate’s assets
\n}
\n[\/java]<\/p>\n

 <\/p>\n

Now we want out IDE to give us syntax-hint inside the closure for delegate’s methods and properties,
\nThis can be achieved by using the following GDSL script:
\n[java]
\n\/\/Get the context for all closures
\ndef ctx = context(scope: closureScope())<\/p>\n

contributor(ctx, {
\n \/\/See if closure is called within method "runWith"
\n def call = enclosingCall("runWith")
\n if (call) {
\n \/\/Get the method object of the closure call
\n def method = call.bind()
\n \/\/Get class containing that calling method.
\n def clazz = method?.containingClass
\n if ("Delegator".equals(clazz?.qualName)) {
\n \/\/Delegate the closure to the object passed as the first argument.
\n delegatesTo(call.arguments[0])
\n }
\n }
\n})
\n[\/java]<\/p>\n

 <\/p>\n

Hurray! now we have syntax completion for delegate’s assets in our closure.<\/p>\n

 <\/p>\n

Read Further in the “GDSL AWESOMENESS” Series<\/h1>\n
    \n
  1. GDSL Awesomeness – Introduction to GDSL in IntelliJ Idea<\/a><\/li>\n
  2. GDSL Awesomeness – Understanding Context And Contributors in Detail<\/a><\/li>\n
  3. GDSL Awesomeness – Defining dynamic property in a class<\/a><\/li>\n
  4. GDSL Awesomeness – Defining dynamic method in a class<\/a><\/li>\n
  5. GDSL Awesomeness – Adding Hinting for missingMethod implementation<\/a><\/li>\n
  6. GDSL Awesomeness – Setting a global context<\/a><\/li>\n
  7. GDSL Awesomeness – Delegating Closure Calls<\/a><\/li>\n
  8. GDSL Awesomeness – Defining methods in a closure passed to method of particular name<\/a><\/li>\n
  9. GDSL Awesomeness – Defining Properties in a closure passed to method of particular name<\/a><\/li>\n
  10. GDSL Awesomeness – Contributing to classes which match a path\/name pattern<\/a><\/li>\n
  11. GDSL Awesomeness – contributing methods with current class return types or parameters<\/a><\/li>\n
  12. GDSL Awesomeness – AutoComplete Script for grails-Mail-Plugin “sendMail” closure<\/a><\/li>\n
  13. GDSL Awesomeness – Getting Code of a method or Field in GDSL Script<\/a><\/li>\n
  14. GDSL Awesomeness – Advanced Example showing domain properties implementation<\/a><\/li>\n<\/ol>\n

     <\/p>\n

     <\/p>\n

    Hope It Helped.
    \nKushal Likhi<\/b><\/p>\n","protected":false},"excerpt":{"rendered":"

    hi,   Very often we use delegates in our closure calls. It would be great if we could get code-hinting in the closure via the delegates.   Now let us take a very simple scenario, where we made a method “with” which delegates the delegate objet to closure and runs it. [java] class Delegator { […]<\/p>\n","protected":false},"author":28,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":35},"categories":[7],"tags":[1057,9,692,691,1059,1060,1058],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/8422"}],"collection":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/users\/28"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/comments?post=8422"}],"version-history":[{"count":0,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/8422\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/media?parent=8422"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/categories?post=8422"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/tags?post=8422"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}