from pyjamas.ui import Composite
 
class Sink(Composite):
    def __init__(self):
        Composite.__init__(self)
 
    def onHide(self):
        pass
 
    def onShow(self):
        pass
 
    def baseURL(self):
        return ""
 
class SinkInfo:
    def __init__(self, name, desc, object_type):
        self.name=name
        self.description=desc
        self.object_type=object_type
        self.instance=None
 
    def createInstance(self):
        if hasattr(self.object_type, "__new__"):
            return self.object_type.__new__()
        return self.object_type()
 
    def getDescription(self):
        return self.description
 
    def getInstance(self):
        if self.instance==None:
            self.instance=self.createInstance()
        return self.instance
 
    def getName(self):
        return self.name