Wiki source code of Creating a Groovy Class
Version 23.7 by Vincent Massol on 2015/02/08
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| author | version | line-number | content |
|---|---|---|---|
| 1 | {{box cssClass="floatinginfobox" title="**Contents**"}} | ||
| 2 | {{toc/}} | ||
| 3 | {{/box}} | ||
| 4 | |||
| 5 | In general, creating a Groovy class in a wiki page is not really recommended and usually it's nicer to create code in Java and make it available to XWiki pages through [[Script Services>>extensions:Extension.Script Module]]. | ||
| 6 | |||
| 7 | However there might be a few cases when it's handy to create a Groovy class in a wiki page and reuse it from several other wiki pages. | ||
| 8 | |||
| 9 | = In XWiki Syntax 2.0+ = | ||
| 10 | |||
| 11 | * Create a page, for example ##Groovy.HelloWorldClass## containing:((( | ||
| 12 | {{info}} | ||
| 13 | This page must have been saved by a user with programming [[rights>>platform:Features.RightsManagement]] to be executed. | ||
| 14 | {{/info}} | ||
| 15 | |||
| 16 | {{code}} | ||
| 17 | {{groovy}} | ||
| 18 | class HelloWorld | ||
| 19 | { | ||
| 20 | String say() | ||
| 21 | { | ||
| 22 | return "Hello World" | ||
| 23 | } | ||
| 24 | } | ||
| 25 | {{/groovy}} | ||
| 26 | {{/code}} | ||
| 27 | ))) | ||
| 28 | * Use this Groovy class from another wiki page, say from ##Main.HelloWorldFromGroovy##: | ||
| 29 | ((( | ||
| 30 | {{info}} | ||
| 31 | This page must have been saved by a user with programming [[rights>>platform:Features.RightsManagement]] to be executed. | ||
| 32 | {{/info}} | ||
| 33 | |||
| 34 | {{code}} | ||
| 35 | {{include document="Groovy.HelloWorldClass"/}} | ||
| 36 | |||
| 37 | {{groovy}} | ||
| 38 | println new HelloWorld().say() | ||
| 39 | {{/groovy}} | ||
| 40 | {{/code}} | ||
| 41 | ))) | ||
| 42 | |||
| 43 | Now when you view ##Main.HelloWorldFromVelocity## you'll see: {{code}}Hello World{{/code}} | ||
| 44 | |||
| 45 | {{info}} | ||
| 46 | * Note that with this strategy it's not possible to call the ##HelloWorld## class from Velocity and you'll need to use a Groovy macro to see it. | ||
| 47 | * Several variables such as ##xwiki##, ##doc##, ##xcontext## are already bound to the Groovy execution context and can be used. See the [[Scripting page>>DevGuide.Scripting]] for more details. | ||
| 48 | {{/info}} | ||
| 49 | |||
| 50 | = In XWiki Syntax 1.0 = | ||
| 51 | |||
| 52 | You'll need to use the ##XWiki.parseGroovyFromPage## API method. This method allow you to instantiate a Groovy class from both Velocity and Groovy scripts. | ||
| 53 | |||
| 54 | * Create a new page, for example ##Groovy.HelloWorldClass## containing: | ||
| 55 | ((( | ||
| 56 | {{info}} | ||
| 57 | * This page must have been saved by a user with programming [[rights>>platform:Features.RightsManagement]] to be executed. | ||
| 58 | * When creating a page that has to be accessed via ##parseGroovyFromString## make sure you do not have opening and closing groovy identifiers. | ||
| 59 | {{/info}} | ||
| 60 | |||
| 61 | {{code}} | ||
| 62 | /* Groovy Class #* */ | ||
| 63 | |||
| 64 | class HelloWorldClass | ||
| 65 | { | ||
| 66 | def xwiki | ||
| 67 | def context | ||
| 68 | |||
| 69 | void setObjects(xwiki, context) | ||
| 70 | { | ||
| 71 | setXWiki(xwiki) | ||
| 72 | setContext(context) | ||
| 73 | } | ||
| 74 | |||
| 75 | void setXWiki(xwiki) | ||
| 76 | { | ||
| 77 | this.xwiki = xwiki | ||
| 78 | } | ||
| 79 | |||
| 80 | void setContext(context) | ||
| 81 | { | ||
| 82 | this.context = context | ||
| 83 | } | ||
| 84 | |||
| 85 | String say() | ||
| 86 | { | ||
| 87 | return "Hello World" | ||
| 88 | } | ||
| 89 | } | ||
| 90 | |||
| 91 | /* *# */ | ||
| 92 | {{/code}} | ||
| 93 | |||
| 94 | {{info}} | ||
| 95 | * Notice the trick of putting a Velocity comment in the Groovy comment so that the code is not parsed by Velocity. | ||
| 96 | * 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 though. | ||
| 97 | {{/info}} | ||
| 98 | ))) | ||
| 99 | |||
| 100 | == Instantiate and use your class from Velocity == | ||
| 101 | |||
| 102 | * Create a new page, for example ##Main.HelloWorldFromVelocity## containing: | ||
| 103 | ((( | ||
| 104 | {{code}} | ||
| 105 | #set($groovyObject = $xwiki.parseGroovyFromPage("Groovy.HelloWorldClass")) | ||
| 106 | $groovyObject.setObjects($xwiki, $context) | ||
| 107 | $groovyObject.say() | ||
| 108 | {{/code}} | ||
| 109 | ))) | ||
| 110 | |||
| 111 | * See the result. Feeling groovy ? ;) | ||
| 112 | |||
| 113 | == Instantiate and use your class from Groovy == | ||
| 114 | |||
| 115 | * Create a new page, for example ##Main.HelloWorldFromGroovy## containing: | ||
| 116 | ((( | ||
| 117 | {{info}} | ||
| 118 | This page must have been saved by a user with programming [[rights>>platform:Features.RightsManagement]] to be executed. | ||
| 119 | {{/info}} | ||
| 120 | |||
| 121 | {{code}} | ||
| 122 | <% | ||
| 123 | groovyObject = xwiki.parseGroovyFromPage("Groovy.HelloWorldClass") | ||
| 124 | groovyObject.setObjects(xwiki, context) | ||
| 125 | print groovyObject.say() | ||
| 126 | %> | ||
| 127 | {{/code}} | ||
| 128 | ))) |
