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Date: Tue, 26 May 2015 22:02:56 +0100
From: =?UTF-8?B?U2NoYWxrIENyb25qw6k=?= <ysb33r@gmail.com>
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To: users@groovy.incubator.apache.org
Subject: Re: Dynamic adding properties to class
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I did at one stage, and the result is the same. The only way I could get 
it to work is something like

class A {
   private Expando props = new Expando()

   void addSomeProp( String name, String key, def value) {
     def p = props.getProperty(name)
     if (null = p) {
       props.setProperty( name,[:] )
     }
     props."${name}"[key]=value.toString()
   }

   def missingProperty( String name ) {
     def p = props.getProperty(name)
     if( null = p ) {
       throw new MissingPropertyException( name,this.class )
     }
     return p
   }
}

Which is strange, as it is what I think ExpandoMetaClass would do anyway.

On 26/05/2015 19:33, KARR, DAVID wrote:
>> -----Original Message-----
>> From: Schalk Cronjé [mailto:ysb33r@gmail.com]
>> Sent: Tuesday, May 26, 2015 8:21 AM
>> To: users@groovy.incubator.apache.org
>> Subject: Dynamic adding properties to class
>>
>> This should be straight-forward, but it is failing for me (at least
>> on
>> 2.3x and 2.4.x). What am I doing wrong?
>>
>> Here is some code sufficiently distilled.
>>
>> class A {
>>     void addSomeProp( String name,String key, def value ) {
>>       if(metaClass.getMetaProperty(name)==null) {
>>         metaClass."${name}" = [:]
>>       }
>>       metaClass."${name}"[key]=value.toString()
>>     }
>> }
> Perhaps try "metaClass.hasProperty(name)" instead?
>
>> A a = new A()
>> a.addSomeProp( 'info','version',3)  // Fails with: No such
>> property:
>> info for class: groovy.lang.MetaClassImpl
>>
>> The idea is to add a map (of name) if it does not exist, and then
>> add
>> items into the map.
>>
>> --
>> Schalk W. Cronjé
>> Twitter / Ello / Toeter : @ysb33r


-- 
Schalk W. Cronjé
Twitter / Ello / Toeter : @ysb33r