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# Copyright (C) 2001, 2002, 2003 by Intevation GmbH |
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# Authors: |
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# Jan-Oliver Wagner <[email protected]> |
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# Bernhard Herzog <[email protected]> |
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# Jonathan Coles <[email protected]> |
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# |
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# This program is free software under the GPL (>=v2) |
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# Read the file COPYING coming with GRASS for details. |
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|
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""" |
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Parser for thuban session files. |
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""" |
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|
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__version__ = "$Revision$" |
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|
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import string, os |
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|
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import xml.sax |
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import xml.sax.handler |
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from xml.sax import make_parser, ErrorHandler, SAXNotRecognizedException |
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|
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from Thuban import _ |
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|
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from Thuban.Model.table import FIELDTYPE_INT, FIELDTYPE_DOUBLE, \ |
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FIELDTYPE_STRING |
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|
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from Thuban.Model.session import Session |
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from Thuban.Model.map import Map |
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from Thuban.Model.layer import Layer, RasterLayer |
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from Thuban.Model.color import Color |
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from Thuban.Model.proj import Projection |
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from Thuban.Model.range import Range |
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from Thuban.Model.classification import Classification, \ |
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ClassGroupDefault, ClassGroupSingleton, ClassGroupRange, ClassGroupMap, \ |
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ClassGroupProperties |
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from Thuban.Model.data import DerivedShapeStore, ShapefileStore |
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from Thuban.Model.table import DBFTable |
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from Thuban.Model.transientdb import TransientJoinedTable |
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|
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class LoadError(Exception): |
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pass |
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|
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from Thuban.Model.xmlreader import XMLReader |
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import resource |
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|
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def parse_color(color): |
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"""Return the color object for the string color. |
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|
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Color may be either 'None' or of the form '#RRGGBB' in the usual |
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HTML color notation |
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""" |
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color = string.strip(color) |
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if color == "None": |
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result = Color.Transparent |
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elif color[0] == '#': |
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if len(color) == 7: |
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r = string.atoi(color[1:3], 16) / 255.0 |
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g = string.atoi(color[3:5], 16) / 255.0 |
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b = string.atoi(color[5:7], 16) / 255.0 |
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result = Color(r, g, b) |
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else: |
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raise ValueError(_("Invalid hexadecimal color specification %s") |
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% color) |
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else: |
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raise ValueError(_("Invalid color specification %s") % color) |
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return result |
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|
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class AttrDesc: |
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|
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def __init__(self, name, required = False, default = "", |
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conversion = None): |
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if not isinstance(name, tuple): |
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fullname = (None, name) |
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else: |
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fullname = name |
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name = name[1] |
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self.name = name |
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self.fullname = fullname |
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self.required = required |
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self.default = default |
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self.conversion = conversion |
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|
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# set by the SessionLoader's check_attrs method |
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self.value = None |
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|
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|
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class SessionLoader(XMLReader): |
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|
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def __init__(self): |
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"""Inititialize the Sax handler.""" |
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XMLReader.__init__(self) |
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|
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self.theSession = None |
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self.aMap = None |
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self.aLayer = None |
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|
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# Map ids used in the thuban file to the corresponding objects |
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# in the session |
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self.idmap = {} |
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|
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dispatchers = { |
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'session' : ("start_session", "end_session"), |
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'fileshapesource': ("start_fileshapesource", None), |
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'derivedshapesource': ("start_derivedshapesource", None), |
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'filetable': ("start_filetable", None), |
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'jointable': ("start_jointable", None), |
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|
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'map' : ("start_map", "end_map"), |
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'projection' : ("start_projection", "end_projection"), |
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'parameter' : ("start_parameter", None), |
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'layer' : ("start_layer", "end_layer"), |
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'rasterlayer' : ("start_rasterlayer", "end_rasterlayer"), |
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'classification': ("start_classification", "end_classification"), |
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'clnull' : ("start_clnull", "end_clnull"), |
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'clpoint' : ("start_clpoint", "end_clpoint"), |
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'clrange' : ("start_clrange", "end_clrange"), |
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'cldata' : ("start_cldata", "end_cldata"), |
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'table' : ("start_table", "end_table"), |
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'labellayer' : ("start_labellayer", None), |
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'label' : ("start_label", None)} |
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|
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# all dispatchers should be used for the 0.8 namespace |
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xmlns = "http://thuban.intevation.org/dtds/thuban-0.8.dtd" |
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for key, value in dispatchers.items(): |
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dispatchers[(xmlns, key)] = value |
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|
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XMLReader.AddDispatchers(self, dispatchers) |
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|
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def start_session(self, name, qname, attrs): |
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self.theSession = Session(self.encode(attrs.get((None, 'title'), |
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None))) |
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|
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def end_session(self, name, qname): |
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pass |
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|
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def check_attrs(self, element, attrs, descr): |
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"""Check and convert some of the attributes of an element |
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|
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Parameters: |
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element -- The element name |
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attrs -- The attrs mapping as passed to the start_* methods |
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descr -- Sequence of attribute descriptions (AttrDesc instances) |
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|
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Return a dictionary containig normalized versions of the |
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attributes described in descr. The keys of that dictionary are |
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the name attributes of the attribute descriptions. The attrs |
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dictionary will not be modified. |
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|
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If the attribute is required, i.e. the 'required' attribute of |
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the descrtiption is true, but it is not in attrs, raise a |
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LoadError. |
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|
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If the attribute has a default value and it is not present in |
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attrs, use that default value as the value in the returned dict. |
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|
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If a conversion is specified, convert the value before putting |
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it into the returned dict. The following conversions are |
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available: |
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|
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'filename' -- The attribute is a filename. |
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|
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If the filename is a relative name, interpret |
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it relative to the directory containing the |
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.thuban file and make it an absolute name |
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|
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'shapestore' -- The attribute is the ID of a shapestore |
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defined earlier in the .thuban file. Look it |
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up self.idmap |
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|
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'table' -- The attribute is the ID of a table or shapestore |
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defined earlier in the .thuban file. Look it up |
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self.idmap. If it's the ID of a shapestore the |
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value will be the table of the shapestore. |
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""" |
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normalized = {} |
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|
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for d in descr: |
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if d.required and not attrs.has_key(d.fullname): |
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pass |
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#raise LoadError("Element %s requires an attribute %r" |
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# % (element, d.name)) |
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value = attrs.get(d.fullname, d.default) |
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|
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if d.conversion == "shapesource": |
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if value in self.idmap: |
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value = self.idmap[value] |
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else: |
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raise LoadError("Element %s requires an already defined ID" |
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" in attribute %r" |
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% (element, d.name)) |
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elif d.conversion == "table": |
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if value in self.idmap: |
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value = self.idmap[value] |
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if isinstance(value, ShapefileStore): |
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value = value.Table() |
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else: |
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raise LoadError("Element %s requires an already defined ID" |
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" in attribute %r" |
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% (element, d.name)) |
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elif d.conversion == "filename": |
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value = os.path.abspath(os.path.join(self.GetDirectory(), |
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value)) |
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|
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normalized[d.name] = value |
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return normalized |
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|
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def start_fileshapesource(self, name, qname, attrs): |
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attrs = self.check_attrs(name, attrs, |
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[AttrDesc("id", True), |
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AttrDesc("filename", True, |
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conversion = "filename"), |
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AttrDesc("filetype", True)]) |
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ID = attrs["id"] |
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filename = attrs["filename"] |
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filetype = attrs["filetype"] |
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if filetype != "shapefile": |
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raise LoadError("shapesource filetype %r not supported" % filetype) |
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self.idmap[ID] = self.theSession.OpenShapefile(filename) |
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|
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def start_derivedshapesource(self, name, qname, attrs): |
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attrs = self.check_attrs(name, attrs, |
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[AttrDesc("id", True), |
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AttrDesc("shapesource", True, |
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conversion = "shapesource"), |
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AttrDesc("table", True, conversion="table")]) |
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store = DerivedShapeStore(attrs["shapesource"], attrs["table"]) |
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self.theSession.AddShapeStore(store) |
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self.idmap[attrs["id"]] = store |
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|
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def start_filetable(self, name, qname, attrs): |
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attrs = self.check_attrs(name, attrs, |
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[AttrDesc("id", True), |
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AttrDesc("title", True), |
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AttrDesc("filename", True, |
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conversion = "filename"), |
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AttrDesc("filetype")]) |
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filetype = attrs["filetype"] |
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if filetype != "DBF": |
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raise LoadError("shapesource filetype %r not supported" % filetype) |
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table = DBFTable(attrs["filename"]) |
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table.SetTitle(attrs["title"]) |
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self.idmap[attrs["id"]] = self.theSession.AddTable(table) |
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|
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def start_jointable(self, name, qname, attrs): |
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attrs = self.check_attrs(name, attrs, |
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[AttrDesc("id", True), |
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AttrDesc("title", True), |
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AttrDesc("left", True, conversion="table"), |
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AttrDesc("leftcolumn", True), |
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AttrDesc("right", True, conversion="table"), |
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AttrDesc("rightcolumn")]) |
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table = TransientJoinedTable(self.theSession.TransientDB(), |
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attrs["left"], attrs["leftcolumn"], |
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attrs["right"], attrs["rightcolumn"]) |
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table.SetTitle(attrs["title"]) |
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self.idmap[attrs["id"]] = self.theSession.AddTable(table) |
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|
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def start_map(self, name, qname, attrs): |
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"""Start a map.""" |
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self.aMap = Map(attrs.get((None, 'title'), None)) |
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|
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def end_map(self, name, qname): |
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self.theSession.AddMap(self.aMap) |
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self.aMap = None |
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|
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def start_projection(self, name, qname, attrs): |
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self.ProjectionName = self.encode(attrs.get((None, 'name'), None)) |
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self.ProjectionParams = [ ] |
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|
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def end_projection(self, name, qname): |
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if self.aLayer is not None: |
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obj = self.aLayer |
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elif self.aMap is not None: |
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obj = self.aMap |
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else: |
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assert False, "projection tag out of context" |
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pass |
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|
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obj.SetProjection( |
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Projection(self.ProjectionParams, self.ProjectionName)) |
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|
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def start_parameter(self, name, qname, attrs): |
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s = attrs.get((None, 'value')) |
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s = str(s) # we can't handle unicode in proj |
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self.ProjectionParams.append(s) |
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|
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def start_layer(self, name, qname, attrs, layer_class = Layer): |
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"""Start a layer |
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|
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Instantiate a layer of class layer_class from the attributes in |
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attrs which may be a dictionary as well as the normal SAX attrs |
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object and bind it to self.aLayer. |
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""" |
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title = self.encode(attrs.get((None, 'title'), "")) |
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filename = attrs.get((None, 'filename'), "") |
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filename = os.path.join(self.GetDirectory(), filename) |
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filename = self.encode(filename) |
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visible = self.encode(attrs.get((None, 'visible'), "true")) != "false" |
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fill = parse_color(attrs.get((None, 'fill'), "None")) |
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stroke = parse_color(attrs.get((None, 'stroke'), "#000000")) |
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stroke_width = int(attrs.get((None, 'stroke_width'), "1")) |
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if attrs.has_key((None, "shapestore")): |
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store = self.idmap[attrs[(None, "shapestore")]] |
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else: |
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store = self.theSession.OpenShapefile(filename) |
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self.aLayer = layer_class(title, store, |
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fill = fill, stroke = stroke, |
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lineWidth = stroke_width, |
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visible = visible) |
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|
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def end_layer(self, name, qname): |
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self.aMap.AddLayer(self.aLayer) |
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self.aLayer = None |
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|
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def start_rasterlayer(self, name, qname, attrs, layer_class = RasterLayer): |
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title = self.encode(attrs.get((None, 'title'), "")) |
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filename = attrs.get((None, 'filename'), "") |
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filename = os.path.join(self.GetDirectory(), filename) |
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filename = self.encode(filename) |
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visible = self.encode(attrs.get((None, 'visible'), "true")) != "false" |
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|
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self.aLayer = layer_class(title, filename, visible = visible) |
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|
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def end_rasterlayer(self, name, qname): |
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self.aMap.AddLayer(self.aLayer) |
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self.aLayer = None |
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|
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def start_classification(self, name, qname, attrs): |
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field = attrs.get((None, 'field'), None) |
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|
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fieldType = attrs.get((None, 'field_type'), None) |
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dbFieldType = self.aLayer.GetFieldType(field) |
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|
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if fieldType != dbFieldType: |
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raise ValueError(_("xml field type differs from database!")) |
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|
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# setup conversion routines depending on the kind of data |
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# we will be seeing later on |
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if fieldType == FIELDTYPE_STRING: |
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self.conv = str |
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elif fieldType == FIELDTYPE_INT: |
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self.conv = lambda p: int(float(p)) |
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elif fieldType == FIELDTYPE_DOUBLE: |
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self.conv = float |
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|
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self.aLayer.GetClassification().SetField(field) |
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|
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def end_classification(self, name, qname): |
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pass |
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|
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def start_clnull(self, name, qname, attrs): |
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self.cl_group = ClassGroupDefault() |
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self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), ""))) |
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self.cl_prop = ClassGroupProperties() |
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|
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def end_clnull(self, name, qname): |
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self.cl_group.SetProperties(self.cl_prop) |
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self.aLayer.GetClassification().SetDefaultGroup(self.cl_group) |
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del self.cl_group, self.cl_prop |
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|
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def start_clpoint(self, name, qname, attrs): |
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attrib_value = attrs.get((None, 'value'), "0") |
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|
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value = self.conv(attrib_value) |
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|
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self.cl_group = ClassGroupSingleton(value) |
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self.cl_group.SetLabel(self.encode(attrs.get((None, 'label'), ""))) |
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self.cl_prop = ClassGroupProperties() |
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|
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|
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def end_clpoint(self, name, qname): |
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self.cl_group.SetProperties(self.cl_prop) |
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self.aLayer.GetClassification().AppendGroup(self.cl_group) |
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del self.cl_group, self.cl_prop |
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|
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def start_clrange(self, name, qname, attrs): |
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|
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range = attrs.get((None, 'range'), None) |
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# for backward compatibility (min/max are not saved) |
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min = attrs.get((None, 'min'), None) |
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max = attrs.get((None, 'max'), None) |
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|
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try: |
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if range is not None: |
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self.cl_group = ClassGroupRange(Range(range)) |
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elif min is not None and max is not None: |
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self.cl_group = ClassGroupRange(self.conv(min), self.conv(max)) |
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else: |
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self.cl_group = ClassGroupRange(Range(None)) |
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|
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except ValueError: |
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raise ValueError(_("Classification range is not a number!")) |
| 393 |
|
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self.cl_group.SetLabel(attrs.get((None, 'label'), "")) |
| 395 |
self.cl_prop = ClassGroupProperties() |
| 396 |
|
| 397 |
|
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def end_clrange(self, name, qname): |
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self.cl_group.SetProperties(self.cl_prop) |
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self.aLayer.GetClassification().AppendGroup(self.cl_group) |
| 401 |
del self.cl_group, self.cl_prop |
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|
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def start_cldata(self, name, qname, attrs): |
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self.cl_prop.SetLineColor( |
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parse_color(attrs.get((None, 'stroke'), "None"))) |
| 406 |
self.cl_prop.SetLineWidth( |
| 407 |
int(attrs.get((None, 'stroke_width'), "0"))) |
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self.cl_prop.SetFill(parse_color(attrs.get((None, 'fill'), "None"))) |
| 409 |
|
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def end_cldata(self, name, qname): |
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pass |
| 412 |
|
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def start_labellayer(self, name, qname, attrs): |
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self.aLayer = self.aMap.LabelLayer() |
| 415 |
|
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def start_label(self, name, qname, attrs): |
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x = float(attrs[(None, 'x')]) |
| 418 |
y = float(attrs[(None, 'y')]) |
| 419 |
text = self.encode(attrs[(None, 'text')]) |
| 420 |
halign = attrs[(None, 'halign')] |
| 421 |
valign = attrs[(None, 'valign')] |
| 422 |
self.aLayer.AddLabel(x, y, text, halign = halign, valign = valign) |
| 423 |
|
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def characters(self, chars): |
| 425 |
pass |
| 426 |
|
| 427 |
|
| 428 |
def load_session(filename): |
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"""Load a Thuban session from the file object file""" |
| 430 |
|
| 431 |
handler = SessionLoader() |
| 432 |
handler.read(filename) |
| 433 |
|
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session = handler.theSession |
| 435 |
# Newly loaded session aren't modified |
| 436 |
session.UnsetModified() |
| 437 |
|
| 438 |
return session |
| 439 |
|
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