def filterMaps(mapSets, propName,operator,value):
"""Return a new set of maps whose property propName satisfies the given operator/value.
The operators can be ==,!=, <,>,<=,>=, match, !match"""
from ucar.visad import ShapefileAdapter
from ucar.unidata.util import StringUtil
goodOnes = java.util.ArrayList();
sets = mapSets.getSets();
for mapIdx in xrange(len(sets)):
mapValue = getMapProperty(sets[mapIdx],propName);
if(mapValue is None):
continue;
if(operator== '==' and mapValue == value):
goodOnes.add(sets[mapIdx]);
elif(operator== '!=' and mapValue != value):
goodOnes.add(sets[mapIdx]);
elif(operator== '<' and mapValue < value):
goodOnes.add(sets[mapIdx]);
elif(operator== '<=' and mapValue <= value):
goodOnes.add(sets[mapIdx]);
elif(operator== '>' and mapValue > value):
goodOnes.add(sets[mapIdx]);
elif(operator== '>=' and mapValue >= value):
goodOnes.add(sets[mapIdx]);
elif(operator== 'match' and StringUtil.stringMatch(str(mapValue), value)):
goodOnes.add(sets[mapIdx]);
elif(operator== '!match' and not StringUtil.stringMatch(str(mapValue), value)):
print "not match: " + mapValue;
goodOnes.add(sets[mapIdx]);
return ShapefileAdapter.makeSet(goodOnes);
