[JSR223-Jython] Read/add/remove Item metadata in rules

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I put together a class to assist with read/writing of metadata. Still working on some details but starting out with the code below.

from org.eclipse.smarthome.core.items import Metadata
from org.eclipse.smarthome.core.items import MetadataKey
from openhab import osgi
MetadataRegistry = osgi.get_service("org.eclipse.smarthome.core.items.MetadataRegistry")


class Metadata:
    def __init__(self,item_name,namespace):
        self.item_name = item_name
        self.namespace = namespace

    def __str__(self):
        return 'Item: {}, Namespace = {}, Value {}, Configuration {}'.format(self.item_name,self.namespace,self.get_value(),self.get_configuration())

    def does_namespace_exist(self):
        if self.read_metadata() is not None:
            return True
        else:
            return False

    def read_metadata(self):
        return MetadataRegistry.get(MetadataKey(self.namespace,self.item_name)) # returns None if namespace does not exist

    def get_value(self):
        metadata = self.read_metadata()
        return metadata and str(metadata.value) or None

    def get_configuration(self):
        metadata=self.read_metadata() 
        md_configuration = hasattr(metadata, 'configuration') and metadata.configuration or {}

        configuration = {} # process any configuration values here
        for key,value in md_configuration.iteritems():
            configuration [str(key)] = str(value)

        return configuration

    def get_configuration_value_for_key(self,key):
        configuration = self.get_configuration()
        return configuration.has_key(key) and configuration [key] or None 

    def write(self,value='',configuration={}):
        MetadataRegistry.add(Metadata(MetadataKey(self.namespace,self.item_name),str(value),configuration))
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