Thanks for explaining that.
On 27/05/2015 08:43, Jochen Theodorou wrote:
Am 26.05.2015 17:20, schrieb Schalk Cronjé:
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()
}
}
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.
What you want to do requires ExpandoMetaClass, which is not the
default, unless you do ExpandoMetaClass.enableGlobally().
something like
A a = new A()
def mc = new ExpandoMetaClass(A,true,true)
mc.initialize()
a.metaClass = mc
can be used as alternative.
Then, there is also a bug in
`metaClass."${name}"[key]=value.toString()`. since you want to set the
value of the property you don't operate on the metaClass, where you
defined the property, instead you work on the instance of the class:
this."${name}"[key]=value.toString()
complete program:
class A {
void addSomeProp( String name,String key, def value ) {
if(metaClass.getMetaProperty(name)==null) {
metaClass."${name}" = [:]
}
this."${name}"[key]=value.toString()
}
}
A a = new A()
def mc = new ExpandoMetaClass(A,true,true)
mc.initialize()
a.metaClass = mc
a.addSomeProp( 'info','version',3)
assert a.info.version == '3'
bye blackdrag
--
Schalk W. Cronjé
Twitter / Ello / Toeter : @ysb33r
