Wiki source code of Creating a Groovy Class
Version 18.3 by RicardoJafe on 2012/03/29
Show last authors
| author | version | line-number | content |
|---|---|---|---|
| 1 | {{warning}} | ||
| 2 | Work in progress, only a snippet for the moment | ||
| 3 | {{/warning}} | ||
| 4 | |||
| 5 | This tutorial illustrates the ##XWiki.parseGroovyFromPage## API method. This method allow you to instantiate a groovy class from both velocity and groovy code. | ||
| 6 | |||
| 7 | = Create a groovy class = | ||
| 8 | |||
| 9 | * Create a new page, for example ##Groovy.HelloWorldClass## containing :((( | ||
| 10 | {{info}}This page must have been saved by a user with programming [[rights>>platform:Features.RightsManagement]] to be executed{{/info}} | ||
| 11 | )))((( | ||
| 12 | {{info}} | ||
| 13 | When creating a page to access via "parseGroovyFromString", make sure you do not have opening and closing groovy tags (don't put {{code}}{{groovy}} and {{/groovy}} {{/code}} on the page) | ||
| 14 | |||
| 15 | {{/info}} | ||
| 16 | )))((( | ||
| 17 | {{code}} | ||
| 18 | /* Groovy Class #* */ | ||
| 19 | |||
| 20 | class groovyClass { | ||
| 21 | |||
| 22 | def xwiki; | ||
| 23 | def context; | ||
| 24 | |||
| 25 | void setObjects(xwiki, context) { | ||
| 26 | setXWiki(xwiki); | ||
| 27 | setContext(context); | ||
| 28 | } | ||
| 29 | void setXWiki(xwiki) { | ||
| 30 | this.xwiki = xwiki; | ||
| 31 | } | ||
| 32 | |||
| 33 | void setContext(context) { | ||
| 34 | this.context = context; | ||
| 35 | } | ||
| 36 | |||
| 37 | String helloWorld() { | ||
| 38 | return "Hello World"; | ||
| 39 | } | ||
| 40 | } | ||
| 41 | |||
| 42 | /* *# */ | ||
| 43 | {{/code}} | ||
| 44 | ))) | ||
| 45 | |||
| 46 | Notice the trick of putting a Velocity comment in the Groovy comment so that the code is not parsed by Velocity. | ||
| 47 | |||
| 48 | {{info}}Notice the ";" - this identifies a new instruction line, and although not mandatory, avoids potential problems if linefeeds are lost.{{/info}} | ||
| 49 | |||
| 50 | {{info}} | ||
| 51 | As you can see, we can get and store the xwiki and context objects in the class to be able to use them; Their use is not illustrated in this tutorial. | ||
| 52 | {{/info}} | ||
| 53 | |||
| 54 | = Instantiate and use your class from velocity = | ||
| 55 | |||
| 56 | * Create a new page, for example "Main.HelloWorldFromVelocity" containing :((( | ||
| 57 | {{code}} | ||
| 58 | #set($groovyObject = $xwiki.parseGroovyFromPage("Groovy.HelloWorldClass")) | ||
| 59 | $groovyObject.setObjects($xwiki, $context) | ||
| 60 | $groovyObject.helloWorld() | ||
| 61 | {{/code}} | ||
| 62 | ))) | ||
| 63 | |||
| 64 | * See the result, feeling groovy ? ;) | ||
| 65 | |||
| 66 | = Instantiate and use your class from groovy = | ||
| 67 | |||
| 68 | * Create a new page, for example "Groovy.HelloWorldClass" containing :((( | ||
| 69 | {{info}} | ||
| 70 | This page must have been saved by a user with programming rights to be executed | ||
| 71 | {{/info}} | ||
| 72 | )))((( | ||
| 73 | {{code}} | ||
| 74 | {{groovy}} | ||
| 75 | groovyObject = xwiki.parseGroovyFromPage("Groovy.HelloWorldClass") | ||
| 76 | groovyObject.setObjects(xwiki, context) | ||
| 77 | print(groovyObject.helloWorld()) | ||
| 78 | {{/groovy}} | ||
| 79 | {{/code}} | ||
| 80 | ))) | ||
| 81 | |||
| 82 | * See the result, feeling groovy ? ;) | ||
| 83 | |||
| 84 | = More documentation = | ||
| 85 | |||
| 86 | Do search around for Groovy language, it's pretty rich. | ||
| 87 | |||
| 88 | A cute feature is, for example, [[how it can access XML>>http://www.ibm.com/developerworks/java/library/j-pg05199/index.html?S_TACT=105AGX02&S_CMP=EDU]] | ||
| 89 | Many tools are equipped to edit Groovy, among others [[IntelliJ IDEA>>http://www.jetbrains.com/idea/]] and [[Eclipse>>http://www.eclipse.org/]]. For both Velocity and Groovy, IntelliJ IDEA can be enriched with the type of predefined variables thanks to intentions or dynamic properties (e.g. xwiki, doc, context). |
