/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/classification.py

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-trunk/thuban/Thuban/Model/classification.py
revision 374 by jan,
Mon Jan 27 14:20:02 2003 UTC
+branches/WIP-pyshapelib-bramz/Thuban/Model/classification.py
revision 2734 by bramz,
Thu Mar  1 12:42:59 2007 UTC
 Line 1
- # Copyright (c) 2001 by Intevation GmbH
+ # Copyright (c) 2001, 2003, 2005, 2006 by Intevation GmbH
  # Authors:
  # Jonathan Coles <[email protected]>
+ # Jan-Oliver Wagner <[email protected]> (2005)
+ # Frank Koormann <[email protected]> (2006)
  #
  # This program is free software under the GPL (>=v2)
  # Read the file COPYING coming with Thuban for details.
-Line 13 
 to data. This mapping can be specified i
+Line 15 
 to data. This mapping can be specified i
  First, specific values can be associated with data.
  Second, ranges can be associated with data such that if
  an input value falls with a range that data is returned.
- If no mapping can be found then a NullData data will
+ If no mapping can be found then default data will
  be returned. Input values must be hashable objects
- See the description of getProperties() for more information
+ See the description of FindGroup() for more information
  on the mapping algorithm.
  """
+ import copy, operator, types
+ import re
  from Thuban import _
- # constants
+ from messages import \
- RANGE_MIN  = 0
+     LAYER_PROJECTION_CHANGED, \
- RANGE_MAX  = 1
+     LAYER_LEGEND_CHANGED, \
- RANGE_DATA = 2
+     LAYER_VISIBILITY_CHANGED,\
+     CLASS_CHANGED
+ from Thuban.Model.color import Color, Transparent, Black
+ from Thuban.Model.range import Range
+ import Thuban.Model.layer
+ from Thuban.Lib.connector import Publisher
+ class Classification(Publisher):
+     """Encapsulates the classification of layer.
+     The Classification divides some kind of data into Groups which
+     are associated with properties. Later the properties can be
+     retrieved by matching data values to the appropriate group.
+     """
+     def __init__(self):
+         """Initialize a classification."""
+         self.__groups = []
+         self.SetDefaultGroup(ClassGroupDefault())
+     def __iter__(self):
+         return ClassIterator(self.__groups)
+     def __deepcopy__(self, memo):
+         clazz = Classification()
+         clazz.__groups[0] = copy.deepcopy(self.__groups[0])
+         for i in range(1, len(self.__groups)):
+             clazz.__groups.append(copy.deepcopy(self.__groups[i]))
+         return clazz
+     def __SendNotification(self):
+         """Notify the layer that this class has changed."""
+         self.issue(CLASS_CHANGED)
+     def __getattr__(self, attr):
+         """Generate the compiled classification on demand"""
+         if attr == "_compiled_classification":
+             self._compile_classification()
+             return self._compiled_classification
+         raise AttributeError(attr)
+     def _compile_classification(self):
+         """Generate the compiled classification
- class Classification:
+         The compiled classification is a more compact representation of
+         the classification groups that is also more efficient for
+         performing the classification.
+         The compiled classification is a list of tuples. The first
+         element of the tuple is a string which describes the rest of the
+         tuple. There are two kinds of tuples:
-     def __init__(self, field = None):
+           'singletons'
-         """Initialize a classification.
-            field -- the name of the data table field that
+             The second element of the tuple is a dictionary which
-                     is to be used to classify layer properties
+             combines several consecutive ClassGroupSingleton instances.
+             The dictionary maps the values of the singletons (as
+             returned by the GetValue() method) to the corresponding
+             group.
+           'range'
+             The tuple describes a ClassGroupRange instance. The tuples
+             second element is a tuple fo the form (lfunc, min, max,
+             rfunc, group) where group is the original group object,
+             lfunc and rfuct are comparison functions and min and max are
+             lower and upper bounds of the range. Given a value and such
+             a tuple the group matches if and only if
+                 lfunc(min, value) and rfunc(max, value)
+             is true.
+           'pattern'
+             The tuple contains the compiled regular expression object and
+             the original group object.
+         The compiled classification is bound to
+         self._compile_classification.
          """
+         compiled = []
-         self.__points = {}
+         for group in self.__groups[1:]:
-         self.__ranges = []
+             if isinstance(group, ClassGroupSingleton):
-         self.setField(field)
+                 if not compiled or compiled[-1][0] != "singletons":
-         self.setNull(None)
+                     compiled.append(("singletons", {}))
+                 compiled[-1][1].setdefault(group.GetValue(), group)
+             elif isinstance(group, ClassGroupPattern):
+                 pattern = re.compile(group.GetPattern())
+                 compiled.append(("pattern", (pattern, group)))
+             elif isinstance(group, ClassGroupRange):
+                 left, min, max, right = group.GetRangeTuple()
+                 if left == "[":
+                     lfunc = operator.le
+                 elif left == "]":
+                     lfunc = operator.lt
+                 if right == "[":
+                     rfunc = operator.gt
+                 elif right == "]":
+                     rfunc = operator.ge
+                 compiled.append(("range", (lfunc, min, max, rfunc, group)))
+             else:
+                 raise TypeError("Unknown group type %s", group)
+         self._compiled_classification = compiled
+     def _clear_compiled_classification(self):
+         """Reset the compiled classification.
+         If will be created on demand when self._compiled_classification
+         is accessed again.
+         Call this method whenever self.__groups is modified.
+         """
+         try:
+             del self._compiled_classification
+         except:
+             pass
+     #
+     # these SetDefault* methods are really only provided for
+     # some backward compatibility. they should be considered
+     # for removal once all the classification code is finished.
+     #
+     def SetDefaultFill(self, fill):
+         """Set the default fill color.
+         fill -- a Color object.
+         """
+         self.GetDefaultGroup().GetProperties().SetFill(fill)
+         self.__SendNotification()
+     def GetDefaultFill(self):
+         """Return the default fill color."""
+         return self.GetDefaultGroup().GetProperties().GetFill()
+     def SetDefaultLineColor(self, color):
+         """Set the default line color.
+         color -- a Color object.
+         """
+         self.GetDefaultGroup().GetProperties().SetLineColor(color)
+         self.__SendNotification()
-     def setField(self, field):
+     def GetDefaultLineColor(self):
-         """Set the name of the data table field to use.
+         """Return the default line color."""
+         return self.GetDefaultGroup().GetProperties().GetLineColor()
-            field -- if None then all values map to NullData
+     def SetDefaultLineWidth(self, lineWidth):
+         """Set the default line width.
+         lineWidth -- an integer > 0.
          """
+         assert isinstance(lineWidth, types.IntType)
+         self.GetDefaultGroup().GetProperties().SetLineWidth(lineWidth)
+         self.__SendNotification()
+     def GetDefaultLineWidth(self):
+         """Return the default line width."""
+         return self.GetDefaultGroup().GetProperties().GetLineWidth()
-         self.field = field
+     #
+     # The methods that manipulate self.__groups have to be kept in
+     # sync. We store the default group in index 0 to make it
+     # convienent to iterate over the classification's groups, but
+     # from the user's perspective the first (non-default) group is
+     # at index 0 and the DefaultGroup is a special entity.
+     #
-     def setNull(self, data):
+     def SetDefaultGroup(self, group):
-         """Set the data to be used when a value can't be classified.
+         """Set the group to be used when a value can't be classified.
-            data -- data that the value maps to. See class description.
+         group -- group that the value maps to.
          """
+         assert isinstance(group, ClassGroupDefault)
+         if len(self.__groups) > 0:
+             self.__groups[0] = group
+         else:
+             self.__groups.append(group)
+         self.__SendNotification()
+     def GetDefaultGroup(self):
+         """Return the default group."""
+         return self.__groups[0]
+     def AppendGroup(self, item):
+         """Append a new ClassGroup item to the classification.
-         self.NullData = data
+         item -- this must be a valid ClassGroup object
+         """
-     def addRange(self, min, max, data):
+         self.InsertGroup(self.GetNumGroups(), item)
-         """Add a new range to the classification.
-            A range allows a value to be classified if it falls between
+     def InsertGroup(self, index, group):
-            min and max. Specifically, min <= value < max
+         assert isinstance(group, ClassGroup)
+         self.__groups.insert(index + 1, group)
-            min -- the lower bound.
+         self._clear_compiled_classification()
+         self.__SendNotification()
+     def RemoveGroup(self, index):
+         """Remove the classification group with the given index"""
+         self.__groups.pop(index + 1)
+         self._clear_compiled_classification()
+         self.__SendNotification()
+     def ReplaceGroup(self, index, group):
+         assert isinstance(group, ClassGroup)
+         self.__groups[index + 1] = group
+         self._clear_compiled_classification()
+         self.__SendNotification()
+     def GetGroup(self, index):
+         return self.__groups[index + 1]
+     def GetNumGroups(self):
+         """Return the number of non-default groups in the classification."""
+         return len(self.__groups) - 1
-            max -- the upper bound.
+     def FindGroup(self, value):
+         """Return the group that matches the value.
-            data -- data that the value maps to. See class description.
+         Groups are effectively checked in the order the were added to
+         the Classification.
+         value -- the value to classify. If there is no mapping or value
+                  is None, return the default properties
+         """
+         if value is not None:
+             for typ, params in self._compiled_classification:
+                 if typ == "singletons":
+                     group = params.get(value)
+                     if group is not None:
+                         return group
+                 elif typ == "range":
+                     lfunc, min, max, rfunc, g = params
+                     if lfunc(min, value) and rfunc(max, value):
+                         return g
+                 elif typ == "pattern":
+                     # TODO: make pattern more robust. The following chrashes
+                     # if accidently be applied on non-string columns.
+                     # Usually the UI prevents this.
+                     p, g = params
+                     if p.match(value):
+                         return g
+         return self.GetDefaultGroup()
+     def GetProperties(self, value):
+         """Return the properties associated with the given value.
+         Use this function rather than Classification.FindGroup().GetProperties()
+         since the returned group may be a ClassGroupMap which doesn't support
+         a call to GetProperties().
          """
-         if min >= max:
+         group = self.FindGroup(value)
-             raise ValueError(_("Range minimum >= maximum!"))
+         if isinstance(group, ClassGroupMap):
-         self.__ranges.append([min, max, data])
+             return group.GetPropertiesFromValue(value)
+         else:
+             return group.GetProperties()
+     def TreeInfo(self):
+         items = []
+         def build_color_item(text, color):
+             if color is Transparent:
+                 return ("%s: %s" % (text, _("None")), None)
+             return ("%s: (%.3f, %.3f, %.3f)" %
+                     (text, color.red, color.green, color.blue),
+                     color)
+         def build_item(group, string):
+             label = group.GetLabel()
+             if label == "":
+                 label = string
+             else:
+                 label += " (%s)" % string
+             props = group.GetProperties()
+             i = []
+             v = props.GetLineColor()
+             i.append(build_color_item(_("Line Color"), v))
+             v = props.GetLineWidth()
+             i.append(_("Line Width: %s") % v)
+             # Note: Size is owned by all properties, so
+             # a size will also appear where it does not
+             # make sense like for lines and polygons.
+             v = props.GetSize()
+             i.append(_("Size: %s") % v)
+             v = props.GetFill()
+             i.append(build_color_item(_("Fill"), v))
+             return (label, i)
+         for p in self:
+             items.append(build_item(p, p.GetDisplayText()))
-     def addPoint(self, value, data):
+         return (_("Classification"), items)
-         """Associate a single value with data.
-            When this value is to be classified data will be returned.
+ class ClassIterator:
+     """Allows the Groups in a Classifcation to be interated over.
-            value -- classification value.
+     The items are returned in the following order:
+         default data, singletons, ranges, maps
+     """
-            data  -- data that the value maps to. See class description.
+     def __init__(self, data): #default, points, ranges, maps):
+         """Constructor.
+         default -- the default group
+         points -- a list of singleton groups
+         ranges -- a list of range groups
+         maps -- a list of map groups
+         """
+         self.data = data
+         self.data_index = 0
+     def __iter__(self):
+         return self
+     def next(self):
+         """Return the next item."""
+         if self.data_index >= len(self.data):
+             raise StopIteration
+         else:
+             d = self.data[self.data_index]
+             self.data_index += 1
+             return d
+ class ClassGroupProperties:
+     """Represents the properties of a single Classification Group.
+     These are used when rendering a layer."""
+     # TODO: Actually, size is only relevant for point objects.
+     # Eventually it should be spearated, e.g. when introducing symbols.
+     def __init__(self, props = None):
+         """Constructor.
+         props -- a ClassGroupProperties object. The class is copied if
+                  prop is not None. Otherwise, a default set of properties
+                  is created such that: line color = Black, line width = 1,
+                  size = 5 and fill color = Transparent
+         """
+         if props is not None:
+             self.SetProperties(props)
+         else:
+             self.SetLineColor(Black)
+             self.SetLineWidth(1)
+             self.SetSize(5)
+             self.SetFill(Transparent)
+     def SetProperties(self, props):
+         """Set this class's properties to those in class props."""
+         assert isinstance(props, ClassGroupProperties)
+         self.SetLineColor(props.GetLineColor())
+         self.SetLineWidth(props.GetLineWidth())
+         self.SetSize(props.GetSize())
+         self.SetFill(props.GetFill())
+     def GetLineColor(self):
+         """Return the line color as a Color object."""
+         return self.__stroke
+     def SetLineColor(self, color):
+         """Set the line color.
+         color -- the color of the line. This must be a Color object.
+         """
+         self.__stroke = color
+     def GetLineWidth(self):
+         """Return the line width."""
+         return self.__strokeWidth
+     def SetLineWidth(self, lineWidth):
+         """Set the line width.
+         lineWidth -- the new line width. This must be > 0.
          """
+         assert isinstance(lineWidth, types.IntType)
+         if (lineWidth < 1):
+             raise ValueError(_("lineWidth < 1"))
-         self.__points[value] = data
+         self.__strokeWidth = lineWidth
-     def getProperties(self, value):
+     def GetSize(self):
-         """Return the associated data, or the NullData.
+         """Return the size."""
+         return self.__size
-            The following search technique is used:
+     def SetSize(self, size):
-                (1) if the field is None, return NullData
+         """Set the size.
-                (2) check if the value exists as a single value
-                (3) check if the value falls within a range. Ranges
-                    are checked in the order they were added to
-                    the classification.
-            value -- the value to classify. If there is no mapping
+         size -- the new size. This must be > 0.
-                     return the NullData (which may be None)
          """
+         assert isinstance(size, types.IntType)
+         if (size < 1):
+             raise ValueError(_("size < 1"))
+         self.__size = size
+     def GetFill(self):
+         """Return the fill color as a Color object."""
+         return self.__fill
+     def SetFill(self, fill):
+         """Set the fill color.
+         fill -- the color of the fill. This must be a Color object.
+         """
+         self.__fill = fill
+     def __eq__(self, other):
+         """Return true if 'props' has the same attributes as this class"""
+         #
+         # using 'is' over '==' results in a huge performance gain
+         # in the renderer
+         #
+         return isinstance(other, ClassGroupProperties)   \
+             and (self.__stroke is other.__stroke or      \
+                  self.__stroke == other.__stroke)        \
+             and (self.__fill is other.__fill or          \
+                  self.__fill == other.__fill)            \
+             and self.__strokeWidth == other.__strokeWidth\
+             and self.__size == other.__size
+     def __ne__(self, other):
+         return not self.__eq__(other)
+     def __copy__(self):
+         return ClassGroupProperties(self)
+     def __deepcopy__(self):
+         return ClassGroupProperties(self)
+     def __repr__(self):
+         return repr((self.__stroke, self.__strokeWidth, self.__size,
+                     self.__fill))
+ class ClassGroup:
+     """A base class for all Groups within a Classification"""
+     def __init__(self, label = "", props = None, group = None):
+         """Constructor.
+         label -- A string representing the Group's label
+         """
+         if group is not None:
+             self.SetLabel(copy.copy(group.GetLabel()))
+             self.SetProperties(copy.copy(group.GetProperties()))
+             self.SetVisible(group.IsVisible())
+         else:
+             self.SetLabel(label)
+             self.SetProperties(props)
+             self.SetVisible(True)
+     def GetLabel(self):
+         """Return the Group's label."""
+         return self.label
+     def SetLabel(self, label):
+         """Set the Group's label.
+         label -- a string representing the Group's label. This must
+                  not be None.
+         """
+         assert isinstance(label, types.StringTypes)
+         self.label = label
+     def GetDisplayText(self):
+         assert False, "GetDisplay must be overridden by subclass!"
+         return ""
+     def Matches(self, value):
+         """Determines if this Group is associated with the given value.
+         Returns False. This needs to be overridden by all subclasses.
+         """
+         assert False, "GetMatches must be overridden by subclass!"
+         return False
+     def GetProperties(self):
+         """Return the properties associated with the given value."""
+         return self.prop
+     def SetProperties(self, prop):
+         """Set the properties associated with this Group.
+         prop -- a ClassGroupProperties object. if prop is None,
+                 a default set of properties is created.
+         """
+         if prop is None: prop = ClassGroupProperties()
+         assert isinstance(prop, ClassGroupProperties)
+         self.prop = prop
+     def IsVisible(self):
+         return self.visible
+     def SetVisible(self, visible):
+         self.visible = visible
+     def __eq__(self, other):
+         return isinstance(other, ClassGroup) \
+             and self.label == other.label \
+             and self.GetProperties() == other.GetProperties()
+     def __ne__(self, other):
+         return not self.__eq__(other)
+     def __repr__(self):
+         return repr(self.label) + ", " + repr(self.GetProperties())
+ class ClassGroupSingleton(ClassGroup):
+     """A Group that is associated with a single value."""
+     def __init__(self, value = 0, props = None, label = "", group = None):
+         """Constructor.
+         value -- the associated value.
+         prop -- a ClassGroupProperites object. If prop is None a default
+                  set of properties is created.
+         label -- a label for this group.
+         """
+         ClassGroup.__init__(self, label, props, group)
+         self.SetValue(value)
+     def __copy__(self):
+         return ClassGroupSingleton(self.GetValue(),
+                                    self.GetProperties(),
+                                    self.GetLabel())
+     def __deepcopy__(self, memo):
+         return ClassGroupSingleton(self.GetValue(), group = self)
+     def GetValue(self):
+         """Return the associated value."""
+         return self.__value
+     def SetValue(self, value):
+         """Associate this Group with the given value."""
+         self.__value = value
+     def Matches(self, value):
+         """Determine if the given value matches the associated Group value."""
+         """Returns True if the value matches, False otherwise."""
+         return self.__value == value
+     def GetDisplayText(self):
+         label = self.GetLabel()
+         if label != "": return label
+         return str(self.GetValue())
+     def __eq__(self, other):
+         return ClassGroup.__eq__(self, other) \
+             and isinstance(other, ClassGroupSingleton) \
+             and self.__value == other.__value
+     def __repr__(self):
+         return "(" + repr(self.__value) + ", " + ClassGroup.__repr__(self) + ")"
+ class ClassGroupDefault(ClassGroup):
+     """The default Group. When values do not match any other
+        Group within a Classification, the properties from this
+        class are used."""
+     def __init__(self, props = None, label = "", group = None):
+         """Constructor.
+         prop -- a ClassGroupProperites object. If prop is None a default
+                  set of properties is created.
+         label -- a label for this group.
+         """
+         ClassGroup.__init__(self, label, props, group)
+     def __copy__(self):
+         return ClassGroupDefault(self.GetProperties(), self.GetLabel())
+     def __deepcopy__(self, memo):
+         return ClassGroupDefault(label = self.GetLabel(), group = self)
+     def Matches(self, value):
+         return True
+     def GetDisplayText(self):
+         label = self.GetLabel()
+         if label != "": return label
+         return _("DEFAULT")
+     def __eq__(self, other):
+         return ClassGroup.__eq__(self, other) \
+             and isinstance(other, ClassGroupDefault) \
+             and self.GetProperties() == other.GetProperties()
+     def __repr__(self):
+         return "(" + ClassGroup.__repr__(self) + ")"
+ class ClassGroupRange(ClassGroup):
+     """A Group that represents a range of values that map to the same
+        set of properties."""
+     def __init__(self, _range = (0,1), props = None, label = "", group=None):
+         """Constructor.
+         The minumum value must be strictly less than the maximum.
+         _range -- either a tuple (min, max) where min < max or
+                   a Range object
+         prop -- a ClassGroupProperites object. If prop is None a default
+                  set of properties is created.
+         label -- a label for this group.
+         """
+         ClassGroup.__init__(self, label, props, group)
+         self.SetRange(_range)
+     def __copy__(self):
+         return ClassGroupRange(self.__range,
+                                props = self.GetProperties(),
+                                label = self.GetLabel())
+     def __deepcopy__(self, memo):
+         return ClassGroupRange(copy.copy(self.__range),
+                                group = self)
+     def GetMin(self):
+         """Return the range's minimum value."""
+         return self.__range.GetRange()[1]
+     def SetMin(self, min):
+         """Set the range's minimum value.
+         min -- the new minimum. Note that this must be less than the current
+                maximum value. Use SetRange() to change both min and max values.
+         """
+         self.SetRange((min, self.__range.GetRange()[2]))
+     def GetMax(self):
+         """Return the range's maximum value."""
+         return self.__range.GetRange()[2]
+     def SetMax(self, max):
+         """Set the range's maximum value.
+         max -- the new maximum. Note that this must be greater than the current
+                minimum value. Use SetRange() to change both min and max values.
+         """
+         self.SetRange((self.__range.GetRange()[1], max))
+     def SetRange(self, _range):
+         """Set a new range.
+         _range -- Either a tuple (min, max) where min < max or
+                   a Range object.
+         Raises ValueError on error.
+         """
+         if isinstance(_range, Range):
+             self.__range = _range
+         elif isinstance(_range, types.TupleType) and len(_range) == 2:
+             self.__range = Range(("[", _range[0], _range[1], "["))
+         else:
+             raise ValueError()
+     def GetRange(self):
+         """Return the range as a string"""
+         return self.__range.string(self.__range.GetRange())
+     def GetRangeTuple(self):
+         return self.__range.GetRange()
+     def Matches(self, value):
+         """Determine if the given value lies with the current range.
+         The following check is used: min <= value < max.
+         """
+         return operator.contains(self.__range, value)
+     def GetDisplayText(self):
+         label = self.GetLabel()
+         if label != "": return label
+         return self.__range.string(self.__range.GetRange())
+     def __eq__(self, other):
+         return ClassGroup.__eq__(self, other) \
+             and isinstance(other, ClassGroupRange) \
+             and self.__range == other.__range
+     def __repr__(self):
+         return "(" + str(self.__range) + ClassGroup.__repr__(self) + ")"
+ class ClassGroupPattern(ClassGroup):
+     """A Group that is associated with a reg exp pattern."""
+     def __init__(self, pattern = "", props = None, label = "", group = None):
+         """Constructor.
+         pattern -- the associated pattern.
+         props   -- a ClassGroupProperites object. If props is None a default
+                    set of properties is created.
+         label   -- a label for this group.
+         """
+         ClassGroup.__init__(self, label, props, group)
+         self.SetPattern(pattern)
+     def __copy__(self):
+         return ClassGroupPattern(self.GetPattern(),
+                                    self.GetProperties(),
+                                    self.GetLabel())
+     def __deepcopy__(self, memo):
+         return ClassGroupPattern(self.GetPattern(), group = self)
+     def GetPattern(self):
+         """Return the associated pattern."""
+         return self.__pattern
+     def SetPattern(self, pattern):
+         """Associate this Group with the given pattern."""
+         self.__pattern = pattern
+     def Matches(self, pattern):
+         """Check if the given pattern matches the associated Group pattern."""
+         """Returns True if the value matches, False otherwise."""
+         if re.match(self.__pattern, pattern):
+             return True
+         else:
+             return False
+     def GetDisplayText(self):
+         label = self.GetLabel()
+         if label != "": return label
+         return str(self.GetPattern())
+     def __eq__(self, other):
+         return ClassGroup.__eq__(self, other) \
+             and isinstance(other, ClassGroupPattern) \
+             and self.__pattern == other.__pattern
+     def __repr__(self):
+         return "(" + repr(self.__pattern) + ", " + ClassGroup.__repr__(self) + ")"
+ class ClassGroupMap(ClassGroup):
+     """Currently, this class is not used."""
+     FUNC_ID = "id"
+     def __init__(self, map_type = FUNC_ID, func = None, prop = None, label=""):
+         ClassGroup.__init__(self, label)
+         self.map_type = map_type
+         self.func = func
+         if self.func is None:
+             self.func = func_id
+     def Map(self, value):
+         return self.func(value)
-         if self.field is not None:
+     def GetProperties(self):
-             #
+         return None
-             # first check the discrete values
-             #
-             if self.__points.has_key(value):
-                 return self.__points[value]
-             #
+     def GetPropertiesFromValue(self, value):
-             # now check the ranges
+         pass
-             #
-             for p in self.__ranges:
-                 if (p[RANGE_MIN] <= value) and (value < p[RANGE_MAX]):
-                     return p[RANGE_DATA]
+     def GetDisplayText(self):
+         return "Map: " + self.map_type
-         return self.NullData
+     #
+     # built-in mappings
+     #
+     def func_id(value):
+         return value

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