| 1 |
# Copyright (c) 2001, 2002 by Intevation GmbH |
| 2 |
# Authors: |
| 3 |
# Jan-Oliver Wagner <[email protected]> |
| 4 |
# Bernhard Herzog <[email protected]> |
| 5 |
# Jonathan Coles <[email protected]> |
| 6 |
# |
| 7 |
# This program is free software under the GPL (>=v2) |
| 8 |
# Read the file COPYING coming with Thuban for details. |
| 9 |
|
| 10 |
""" |
| 11 |
Functions to save a session to a file |
| 12 |
""" |
| 13 |
|
| 14 |
__version__ = "$Revision$" |
| 15 |
|
| 16 |
import os |
| 17 |
import string |
| 18 |
|
| 19 |
import Thuban.Lib.fileutil |
| 20 |
|
| 21 |
from Thuban.Model.color import Color |
| 22 |
|
| 23 |
from Thuban.Model.classification import * |
| 24 |
|
| 25 |
# |
| 26 |
# one level of indention |
| 27 |
# |
| 28 |
TAB = " " |
| 29 |
|
| 30 |
def relative_filename(dir, filename): |
| 31 |
"""Return a filename relative to dir for the absolute file name absname. |
| 32 |
|
| 33 |
This is almost the same as the function in fileutil, except that dir |
| 34 |
can be an empty string in which case filename will be returned |
| 35 |
unchanged. |
| 36 |
""" |
| 37 |
if dir: |
| 38 |
return Thuban.Lib.fileutil.relative_filename(dir, filename) |
| 39 |
else: |
| 40 |
return filename |
| 41 |
|
| 42 |
def escape(data): |
| 43 |
"""Escape &, \", ', <, and > in a string of data. |
| 44 |
""" |
| 45 |
data = string.replace(data, "&", "&") |
| 46 |
data = string.replace(data, "<", "<") |
| 47 |
data = string.replace(data, ">", ">") |
| 48 |
data = string.replace(data, '"', """) |
| 49 |
data = string.replace(data, "'", "'") |
| 50 |
return data |
| 51 |
|
| 52 |
class Saver: |
| 53 |
|
| 54 |
"""Class to serialize a session into an XML file. |
| 55 |
|
| 56 |
Applications built on top of Thuban may derive from this class and |
| 57 |
override or extend the methods to save additinal information. This |
| 58 |
additional information should take the form of additional attributes |
| 59 |
or elements whose names are prefixed with a namespace. To define a |
| 60 |
namespace derived classes should extend the write_session method to |
| 61 |
pass the namespaces to the default implementation. |
| 62 |
""" |
| 63 |
|
| 64 |
|
| 65 |
def __init__(self, session): |
| 66 |
self.session = session |
| 67 |
|
| 68 |
def write(self, file_or_filename): |
| 69 |
"""Write the session to a file. |
| 70 |
|
| 71 |
The argument may be either a file object or a filename. If it's |
| 72 |
a filename, the file will be opened for writing. Files of |
| 73 |
shapefiles will be stored as filenames relative to the directory |
| 74 |
the file is stored in (as given by os.path.dirname(filename)) if |
| 75 |
they have a common parent directory other than the root |
| 76 |
directory. |
| 77 |
|
| 78 |
If the argument is a file object (which is determined by the |
| 79 |
presence of a write method) all filenames will be absolut |
| 80 |
filenames. |
| 81 |
""" |
| 82 |
|
| 83 |
# keep track of how many levels of indentation to write |
| 84 |
self.indent_level = 0 |
| 85 |
# track whether an element is currently open. see open_element(). |
| 86 |
self.element_open = 0 |
| 87 |
|
| 88 |
if hasattr(file_or_filename, "write"): |
| 89 |
# it's a file object |
| 90 |
self.file = file_or_filename |
| 91 |
self.dir = "" |
| 92 |
else: |
| 93 |
filename = file_or_filename |
| 94 |
self.dir = os.path.dirname(filename) |
| 95 |
self.file = open(filename, 'w') |
| 96 |
self.write_header() |
| 97 |
self.write_session(self.session) |
| 98 |
|
| 99 |
assert(self.indent_level == 0) |
| 100 |
|
| 101 |
def write_attribs(self, attrs): |
| 102 |
for name, value in attrs.items(): |
| 103 |
self.file.write(' %s="%s"' % (escape(name), value)) |
| 104 |
|
| 105 |
def open_element(self, element, attrs = {}): |
| 106 |
|
| 107 |
# |
| 108 |
# we note when an element is opened so that if two open_element() |
| 109 |
# calls are made successively we can end the currently open |
| 110 |
# tag and will later write a proper close tag. otherwise, |
| 111 |
# if a close_element() call is made directly after an open_element() |
| 112 |
# call we will close the tag with a /> |
| 113 |
# |
| 114 |
if self.element_open == 1: |
| 115 |
self.file.write(">\n") |
| 116 |
|
| 117 |
self.element_open = 1 |
| 118 |
|
| 119 |
# Helper function to write an element open tag with attributes |
| 120 |
self.file.write("%s<%s" % (TAB*self.indent_level, element)) |
| 121 |
self.write_attribs(attrs) |
| 122 |
|
| 123 |
self.indent_level += 1 |
| 124 |
|
| 125 |
def close_element(self, element): |
| 126 |
self.indent_level -= 1 |
| 127 |
assert(self.indent_level >= 0) |
| 128 |
|
| 129 |
# see open_element() for an explanation |
| 130 |
if self.element_open == 1: |
| 131 |
self.element_open = 0 |
| 132 |
self.file.write("/>\n") |
| 133 |
else: |
| 134 |
self.file.write("%s</%s>\n" % (TAB*self.indent_level, element)) |
| 135 |
|
| 136 |
def write_element(self, element, attrs = {}): |
| 137 |
"""write an element that won't need a closing tag""" |
| 138 |
self.open_element(element, attrs) |
| 139 |
self.close_element(element) |
| 140 |
|
| 141 |
def write_header(self): |
| 142 |
"""Write the XML header""" |
| 143 |
self.file.write('<?xml version="1.0" encoding="UTF-8"?>\n') |
| 144 |
self.file.write('<!DOCTYPE session SYSTEM "thuban.dtd">\n') |
| 145 |
|
| 146 |
def write_session(self, session, attrs = None, namespaces = ()): |
| 147 |
"""Write the session and its contents |
| 148 |
|
| 149 |
By default, write a session element with the title attribute and |
| 150 |
call write_map for each map contained in the session. |
| 151 |
|
| 152 |
The optional argument attrs is for additional attributes and, if |
| 153 |
given, should be a mapping from attribute names to attribute |
| 154 |
values. The values should not be XML-escaped yet. |
| 155 |
|
| 156 |
The optional argument namespaces, if given, should be a sequence |
| 157 |
of (name, URI) pairs. The namespaces are written as namespace |
| 158 |
attributes into the session element. This is mainly useful for |
| 159 |
derived classes that need to store additional information in a |
| 160 |
thuban session file. |
| 161 |
""" |
| 162 |
if attrs is None: |
| 163 |
attrs = {} |
| 164 |
attrs["title"] = session.title |
| 165 |
for name, uri in namespaces: |
| 166 |
attrs["xmlns:" + name] = uri |
| 167 |
self.open_element("session", attrs) |
| 168 |
for map in session.Maps(): |
| 169 |
self.write_map(map) |
| 170 |
self.close_element("session") |
| 171 |
|
| 172 |
def write_map(self, map): |
| 173 |
"""Write the map and its contents. |
| 174 |
|
| 175 |
By default, write a map element element with the title |
| 176 |
attribute, call write_projection to write the projection |
| 177 |
element, call write_layer for each layer contained in the map |
| 178 |
and finally call write_label_layer to write the label layer. |
| 179 |
""" |
| 180 |
write = self.file.write |
| 181 |
self.open_element('map title="%s"' % escape(map.title)) |
| 182 |
self.write_projection(map.projection) |
| 183 |
for layer in map.Layers(): |
| 184 |
self.write_layer(layer) |
| 185 |
self.write_label_layer(map.LabelLayer()) |
| 186 |
self.close_element('map') |
| 187 |
|
| 188 |
def write_projection(self, projection): |
| 189 |
"""Write the projection. |
| 190 |
""" |
| 191 |
if projection and len(projection.params) > 0: |
| 192 |
self.open_element("projection") |
| 193 |
for param in projection.params: |
| 194 |
self.write_element('parameter value="%s"' % escape(param)) |
| 195 |
self.close_element("projection") |
| 196 |
|
| 197 |
def write_layer(self, layer, attrs = None): |
| 198 |
"""Write the layer. |
| 199 |
|
| 200 |
The optional argument attrs is for additional attributes and, if |
| 201 |
given, should be a mapping from attribute names to attribute |
| 202 |
values. The values should not be XML-escaped yet. |
| 203 |
""" |
| 204 |
lc = layer.GetClassification() |
| 205 |
|
| 206 |
if attrs is None: |
| 207 |
attrs = {} |
| 208 |
|
| 209 |
attrs["title"] = layer.title |
| 210 |
attrs["filename"] = relative_filename(self.dir, layer.filename) |
| 211 |
attrs["stroke"] = lc.GetDefaultStroke().hex() |
| 212 |
attrs["stroke_width"] = str(lc.GetDefaultStrokeWidth()) |
| 213 |
attrs["fill"] = lc.GetDefaultFill().hex() |
| 214 |
|
| 215 |
self.open_element("layer", attrs) |
| 216 |
self.write_classification(layer) |
| 217 |
self.close_element("layer") |
| 218 |
|
| 219 |
def write_classification(self, layer, attrs = None): |
| 220 |
if attrs is None: |
| 221 |
attrs = {} |
| 222 |
|
| 223 |
lc = layer.GetClassification() |
| 224 |
|
| 225 |
field = lc.GetField() |
| 226 |
|
| 227 |
# |
| 228 |
# there isn't a classification of anything |
| 229 |
# so don't do anything |
| 230 |
# |
| 231 |
if field is None: return |
| 232 |
|
| 233 |
attrs["field"] = field |
| 234 |
self.open_element("classification", attrs) |
| 235 |
|
| 236 |
|
| 237 |
# self.open_element("clnull") |
| 238 |
# write_class_data(lc.GetDefaultData()) |
| 239 |
# self.close_element("clnull") |
| 240 |
|
| 241 |
# just playing now with lambdas and dictionaries |
| 242 |
|
| 243 |
types = {ClassData.DEFAULT: |
| 244 |
[lambda p: 'clnull', |
| 245 |
lambda p: 'clnull'], |
| 246 |
ClassData.POINT: |
| 247 |
[lambda p: 'clpoint value="%s"' % |
| 248 |
str(p.GetValue()), |
| 249 |
lambda p: 'clpoint'], |
| 250 |
ClassData.RANGE: |
| 251 |
[lambda p: 'clrange min="%s" max="%s"' % |
| 252 |
(str(p.GetMin()), |
| 253 |
(str(p.GetMax()))), |
| 254 |
lambda p: 'clrange']} |
| 255 |
|
| 256 |
def write_class_data(data): |
| 257 |
dict = {'stroke' : data.GetStroke().hex(), |
| 258 |
'stroke_width': str(data.GetStrokeWidth()), |
| 259 |
'fill' : data.GetFill().hex()} |
| 260 |
t = data.GetType() |
| 261 |
self.open_element(types[t][0](data)) |
| 262 |
self.write_element("cldata", dict) |
| 263 |
self.close_element(types[t][1](data)) |
| 264 |
|
| 265 |
for i in lc: |
| 266 |
write_class_data(i) |
| 267 |
|
| 268 |
# for i in lc: |
| 269 |
# t = i.GetType() |
| 270 |
# self.open_element(types[t][0](i)) |
| 271 |
# write_class_data(i) |
| 272 |
# self.close_element(types[t][1](i)) |
| 273 |
|
| 274 |
# for p in lc: |
| 275 |
# type = p.GetType() |
| 276 |
# if p == ClassData.DEFAULT: |
| 277 |
# lopen = lclose = 'clnull' |
| 278 |
# elif p == ClassData.POINTS: |
| 279 |
# lopen = 'clpoint value="%s"' % escape(str(p.GetValue())) |
| 280 |
# lclose = 'clpoint' |
| 281 |
# elif p == ClassData.RANGES: |
| 282 |
# lopen = 'clrange min="%s" max="%s"' |
| 283 |
# % (escape(str(p.GetMin())), escape(str(p.GetMax())))) |
| 284 |
# lclose = 'clrange' |
| 285 |
|
| 286 |
# self.open_element(lopen) |
| 287 |
# write_class_data(p) |
| 288 |
# self.close_element(lclose) |
| 289 |
|
| 290 |
# if lc.points != {}: |
| 291 |
# for p in lc.points.values(): |
| 292 |
# self.open_element('clpoint value="%s"' % |
| 293 |
# (escape(str(p.GetValue())))) |
| 294 |
# write_class_data(p) |
| 295 |
# self.close_element('clpoint') |
| 296 |
# |
| 297 |
# if lc.ranges != []: |
| 298 |
# for p in lc.ranges: |
| 299 |
# self.open_element('clrange min="%s" max="%s"' |
| 300 |
# % (escape(str(p.GetMin())), escape(str(p.GetMax())))) |
| 301 |
# write_class_data(p) |
| 302 |
# self.close_element('clrange') |
| 303 |
|
| 304 |
self.close_element("classification") |
| 305 |
|
| 306 |
def write_label_layer(self, layer): |
| 307 |
"""Write the label layer. |
| 308 |
""" |
| 309 |
labels = layer.Labels() |
| 310 |
if labels: |
| 311 |
self.open_element('labellayer') |
| 312 |
for label in labels: |
| 313 |
self.write_element(('label x="%g" y="%g" text="%s"' |
| 314 |
' halign="%s" valign="%s"') |
| 315 |
% (label.x, label.y, label.text, label.halign, |
| 316 |
label.valign)) |
| 317 |
self.close_element('labellayer') |
| 318 |
|
| 319 |
|
| 320 |
|
| 321 |
def save_session(session, file, saver_class = None): |
| 322 |
"""Save the session session to a file. |
| 323 |
|
| 324 |
The file argument may either be a filename or an open file object. |
| 325 |
|
| 326 |
The optional argument saver_class is the class to use to serialize |
| 327 |
the session. By default or if it's None, the saver class will be |
| 328 |
Saver. |
| 329 |
|
| 330 |
If writing the session is successful call the session's |
| 331 |
UnsetModified method |
| 332 |
""" |
| 333 |
if saver_class is None: |
| 334 |
saver_class = Saver |
| 335 |
saver = saver_class(session) |
| 336 |
saver.write(file) |
| 337 |
|
| 338 |
# after a successful save consider the session unmodified. |
| 339 |
session.UnsetModified() |
Parent Directory
| 
Revision Log