Re: Dynamic adding properties to class

[Schalk Cronjé]

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:ysb...@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