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http://wiki.openstreetmap.org/wiki/JOSM/Plugins/Scripting

#!/bin/jython
'''
NumberOfHousenumbers.py
This code is released under the GNU General
Public License v2 or later.

The GPL v3 is accessible here:
http://www.gnu.org/licenses/gpl.html

The GPL v2 is accessible here:
http://www.gnu.org/licenses/old-licenses/gpl-2.0.html

It comes with no warranty whatsoever.

This code illustrates how to use Jython to:
* work with selected items or how to process all the primitives of a certain 
kind (node, way, relation)

'''
from javax.swing import JOptionPane
from org.openstreetmap.josm import Main
import org.openstreetmap.josm.data.osm.Node as Node
import org.openstreetmap.josm.data.osm.Way as Way
import org.openstreetmap.josm.data.osm.Relation as Relation
import org.openstreetmap.josm.data.osm.TagCollection as TagCollection
import org.openstreetmap.josm.data.osm.DataSet as DataSet
import org.openstreetmap.josm.data.osm.RelationMember as RelationMember

def getMapView():
    if Main.main and Main.main.map:
        return Main.main.map.mapView
    else:
        return None

mv = getMapView()
if mv and mv.editLayer and mv.editLayer.data:
    selectedRelations = mv.editLayer.data.getSelectedRelations()

    if not(selectedRelations):
        JOptionPane.showMessageDialog(Main.parent, "Please select one or 
more associatedStreet relations")
    else:
        print
        dummy_way = Way()
        dummy_relation = Relation()
        number = 0
        for aS in selectedRelations:
            for member in aS.getMembers():
                if member.getRole()=='house':
                    number += 1
            print aS.get('name') + ': ' + str(number)
                    



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