/
ogr_datasource.cpp
566 lines (489 loc) · 17.9 KB
/
ogr_datasource.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
// $Id$
#include <iostream>
#include <fstream>
#include <stdexcept>
#include "ogr_datasource.hpp"
#include "ogr_featureset.hpp"
#include "ogr_index_featureset.hpp"
#include "ogr_feature_ptr.hpp"
#include <gdal_version.h>
// mapnik
#include <mapnik/ptree_helpers.hpp>
#include <mapnik/geom_util.hpp>
// boost
#include <boost/algorithm/string.hpp>
#include <boost/make_shared.hpp>
using mapnik::datasource;
using mapnik::parameters;
DATASOURCE_PLUGIN(ogr_datasource)
using mapnik::box2d;
using mapnik::coord2d;
using mapnik::query;
using mapnik::featureset_ptr;
using mapnik::layer_descriptor;
using mapnik::attribute_descriptor;
using mapnik::datasource_exception;
using mapnik::filter_in_box;
using mapnik::filter_at_point;
ogr_datasource::ogr_datasource(parameters const& params, bool bind)
: datasource(params),
extent_(),
type_(datasource::Vector),
desc_(*params_.get<std::string>("type"), *params_.get<std::string>("encoding", "utf-8")),
indexed_(false)
{
boost::optional<std::string> file = params.get<std::string>("file");
boost::optional<std::string> string = params.get<std::string>("string");
if (! file && ! string)
{
throw datasource_exception("missing <file> or <string> parameter");
}
if (string)
{
dataset_name_ = *string;
}
else
{
boost::optional<std::string> base = params.get<std::string>("base");
if (base)
{
dataset_name_ = *base + "/" + *file;
}
else
{
dataset_name_ = *file;
}
}
if (bind)
{
this->bind();
}
}
ogr_datasource::~ogr_datasource()
{
if (is_bound_)
{
// free layer before destroying the datasource
layer_.free_layer();
OGRDataSource::DestroyDataSource (dataset_);
}
}
void ogr_datasource::bind() const
{
if (is_bound_) return;
// initialize ogr formats
OGRRegisterAll();
std::string driver = *params_.get<std::string>("driver","");
if (! driver.empty())
{
OGRSFDriver * ogr_driver = OGRSFDriverRegistrar::GetRegistrar()->GetDriverByName(driver.c_str());
if (ogr_driver && ogr_driver != NULL)
{
dataset_ = ogr_driver->Open((dataset_name_).c_str(), FALSE);
}
}
else
{
// open ogr driver
dataset_ = OGRSFDriverRegistrar::Open((dataset_name_).c_str(), FALSE);
}
if (! dataset_)
{
const std::string err = CPLGetLastErrorMsg();
if (err.size() == 0)
{
throw datasource_exception("OGR Plugin: connection failed: " + dataset_name_ + " was not found or is not a supported format");
}
else
{
throw datasource_exception("OGR Plugin: " + err);
}
}
// initialize layer
boost::optional<std::string> layer_by_name = params_.get<std::string>("layer");
boost::optional<unsigned> layer_by_index = params_.get<unsigned>("layer_by_index");
boost::optional<std::string> layer_by_sql = params_.get<std::string>("layer_by_sql");
int passed_parameters = 0;
passed_parameters += layer_by_name ? 1 : 0;
passed_parameters += layer_by_index ? 1 : 0;
passed_parameters += layer_by_sql ? 1 : 0;
if (passed_parameters > 1)
{
throw datasource_exception("OGR Plugin: you can only select an ogr layer by name "
"('layer' parameter), by number ('layer_by_index' parameter), "
"or by sql ('layer_by_sql' parameter), "
"do not supply 2 or more of them at the same time" );
}
if (layer_by_name)
{
layer_name_ = *layer_by_name;
layer_.layer_by_name(dataset_, layer_name_);
}
else if (layer_by_index)
{
const unsigned num_layers = dataset_->GetLayerCount();
if (*layer_by_index >= num_layers)
{
std::ostringstream s;
s << "OGR Plugin: only ";
s << num_layers;
s << " layer(s) exist, cannot find layer by index '" << *layer_by_index << "'";
throw datasource_exception(s.str());
}
layer_.layer_by_index(dataset_, *layer_by_index);
layer_name_ = layer_.layer_name();
}
else if (layer_by_sql)
{
layer_.layer_by_sql(dataset_, *layer_by_sql);
layer_name_ = layer_.layer_name();
}
else
{
std::ostringstream s;
s << "OGR Plugin: missing <layer> or <layer_by_index> or <layer_by_sql> "
<< "parameter, available layers are: ";
unsigned num_layers = dataset_->GetLayerCount();
bool layer_found = false;
for (unsigned i = 0; i < num_layers; ++i )
{
OGRLayer* ogr_layer = dataset_->GetLayer(i);
OGRFeatureDefn* ogr_layer_def = ogr_layer->GetLayerDefn();
if (ogr_layer_def != 0)
{
layer_found = true;
s << " '" << ogr_layer_def->GetName() << "' ";
}
}
if (! layer_found)
{
s << "None (no layers were found in dataset)";
}
throw datasource_exception(s.str());
}
if (! layer_.is_valid())
{
std::string s("OGR Plugin: ");
if (layer_by_name)
{
s += "cannot find layer by name '" + *layer_by_name;
}
else if (layer_by_index)
{
s += "cannot find layer by index number '" + *layer_by_index;
}
else if (layer_by_sql)
{
s += "cannot find layer by sql query '" + *layer_by_sql;
}
s += "' in dataset '" + dataset_name_ + "'";
throw datasource_exception(s);
}
// work with real OGR layer
OGRLayer* layer = layer_.layer();
// initialize envelope
OGREnvelope envelope;
layer->GetExtent(&envelope);
extent_.init(envelope.MinX, envelope.MinY, envelope.MaxX, envelope.MaxY);
// scan for index file
// TODO - layer names don't match dataset name, so this will break for
// any layer types of ogr than shapefiles, etc
// fix here and in ogrindex
size_t breakpoint = dataset_name_.find_last_of(".");
if (breakpoint == std::string::npos)
{
breakpoint = dataset_name_.length();
}
index_name_ = dataset_name_.substr(0, breakpoint) + ".ogrindex";
std::ifstream index_file(index_name_.c_str(), std::ios::in | std::ios::binary);
if (index_file)
{
indexed_ = true;
index_file.close();
}
#if 0
// TODO - enable this warning once the ogrindex tool is a bit more stable/mature
else
{
std::clog << "### Notice: no ogrindex file found for " << dataset_name_
<< ", use the 'ogrindex' program to build an index for faster rendering"
<< std::endl;
}
#endif
// deal with attributes descriptions
OGRFeatureDefn* def = layer->GetLayerDefn();
if (def != 0)
{
const int fld_count = def->GetFieldCount();
for (int i = 0; i < fld_count; i++)
{
OGRFieldDefn* fld = def->GetFieldDefn(i);
const std::string fld_name = fld->GetNameRef();
const OGRFieldType type_oid = fld->GetType();
switch (type_oid)
{
case OFTInteger:
desc_.add_descriptor(attribute_descriptor(fld_name, mapnik::Integer));
break;
case OFTReal:
desc_.add_descriptor(attribute_descriptor(fld_name, mapnik::Double));
break;
case OFTString:
case OFTWideString: // deprecated
desc_.add_descriptor(attribute_descriptor(fld_name, mapnik::String));
break;
case OFTBinary:
desc_.add_descriptor(attribute_descriptor(fld_name, mapnik::Object));
break;
case OFTIntegerList:
case OFTRealList:
case OFTStringList:
case OFTWideStringList: // deprecated !
#ifdef MAPNIK_DEBUG
std::clog << "OGR Plugin: unhandled type_oid=" << type_oid << std::endl;
#endif
break;
case OFTDate:
case OFTTime:
case OFTDateTime: // unhandled !
#ifdef MAPNIK_DEBUG
std::clog << "OGR Plugin: unhandled type_oid=" << type_oid << std::endl;
#endif
desc_.add_descriptor(attribute_descriptor(fld_name, mapnik::Object));
break;
default: // unknown
#ifdef MAPNIK_DEBUG
std::clog << "OGR Plugin: unknown type_oid=" << type_oid << std::endl;
#endif
break;
}
}
}
is_bound_ = true;
}
std::string ogr_datasource::name()
{
return "ogr";
}
mapnik::datasource::datasource_t ogr_datasource::type() const
{
return type_;
}
box2d<double> ogr_datasource::envelope() const
{
if (! is_bound_) bind();
return extent_;
}
boost::optional<mapnik::datasource::geometry_t> ogr_datasource::get_geometry_type() const
{
boost::optional<mapnik::datasource::geometry_t> result;
if (dataset_ && layer_.is_valid())
{
OGRLayer* layer = layer_.layer();
// NOTE: wkbFlatten macro in ogr flattens 2.5d types into base 2d type
#if GDAL_VERSION_NUM < 1800
switch (wkbFlatten(layer->GetLayerDefn()->GetGeomType()))
#else
switch (wkbFlatten(layer->GetGeomType()))
#endif
{
case wkbPoint:
case wkbMultiPoint:
result.reset(mapnik::datasource::Point);
break;
case wkbLinearRing:
case wkbLineString:
case wkbMultiLineString:
result.reset(mapnik::datasource::LineString);
break;
case wkbPolygon:
case wkbMultiPolygon:
result.reset(mapnik::datasource::Polygon);
break;
case wkbGeometryCollection:
result.reset(mapnik::datasource::Collection);
break;
case wkbNone:
case wkbUnknown:
{
// fallback to inspecting first actual geometry
// TODO - csv and shapefile inspect first 4 features
if (dataset_ && layer_.is_valid())
{
OGRLayer* layer = layer_.layer();
ogr_feature_ptr feat(layer->GetNextFeature());
if ((*feat) != NULL)
{
OGRGeometry* geom = (*feat)->GetGeometryRef();
if (geom && ! geom->IsEmpty())
{
switch (wkbFlatten(geom->getGeometryType()))
{
case wkbPoint:
case wkbMultiPoint:
result.reset(mapnik::datasource::Point);
break;
case wkbLinearRing:
case wkbLineString:
case wkbMultiLineString:
result.reset(mapnik::datasource::LineString);
break;
case wkbPolygon:
case wkbMultiPolygon:
result.reset(mapnik::datasource::Polygon);
break;
case wkbGeometryCollection:
result.reset(mapnik::datasource::Collection);
break;
default:
break;
}
}
}
}
break;
}
default:
break;
}
}
return result;
}
layer_descriptor ogr_datasource::get_descriptor() const
{
if (! is_bound_) bind();
return desc_;
}
mapnik::statistics_ptr ogr_datasource::get_statistics() const
{
if (! is_bound_) bind();
return boost::make_shared<mapnik::statistics>(stats_);
}
void validate_attribute_names(query const& q, std::vector<attribute_descriptor> const& names )
{
std::set<std::string> const& attribute_names = q.property_names();
std::set<std::string>::const_iterator pos = attribute_names.begin();
std::set<std::string>::const_iterator end_names = attribute_names.end();
for ( ;pos != end_names; ++pos)
{
bool found_name = false;
std::vector<attribute_descriptor>::const_iterator itr = names.begin();
std::vector<attribute_descriptor>::const_iterator end = names.end();
for (; itr!=end; ++itr)
{
if (itr->get_name() == *pos)
{
found_name = true;
break;
}
}
if (! found_name)
{
std::ostringstream s;
std::vector<attribute_descriptor>::const_iterator itr = names.begin();
std::vector<attribute_descriptor>::const_iterator end = names.end();
s << "OGR Plugin: no attribute '" << *pos << "'. Valid attributes are: ";
for ( ;itr!=end;++itr)
{
s << itr->get_name() << std::endl;
}
throw mapnik::datasource_exception(s.str());
}
}
}
featureset_ptr ogr_datasource::features(query const& q) const
{
if (! is_bound_) bind();
if (dataset_ && layer_.is_valid())
{
// First we validate query fields: https://github.com/mapnik/mapnik/issues/792
std::vector<attribute_descriptor> const& desc_ar = desc_.get_descriptors();
// feature context (schema)
mapnik::context_ptr ctx = boost::make_shared<mapnik::context_type>();
std::vector<attribute_descriptor>::const_iterator itr = desc_ar.begin();
std::vector<attribute_descriptor>::const_iterator end = desc_ar.end();
for (; itr!=end; ++itr) ctx->push(itr->get_name()); // TODO only push query attributes
validate_attribute_names(q, desc_ar);
OGRLayer* layer = layer_.layer();
if (indexed_)
{
filter_in_box filter(q.get_bbox());
return featureset_ptr(new ogr_index_featureset<filter_in_box>(ctx,
*dataset_,
*layer,
filter,
index_name_,
desc_.get_encoding()
));
}
else
{
return featureset_ptr(new ogr_featureset (ctx,
*dataset_,
*layer,
q.get_bbox(),
desc_.get_encoding()
));
}
}
return featureset_ptr();
}
featureset_ptr ogr_datasource::features_at_point(coord2d const& pt) const
{
if (!is_bound_) bind();
if (dataset_ && layer_.is_valid())
{
std::vector<attribute_descriptor> const& desc_ar = desc_.get_descriptors();
// feature context (schema)
mapnik::context_ptr ctx = boost::make_shared<mapnik::context_type>();
std::vector<attribute_descriptor>::const_iterator itr = desc_ar.begin();
std::vector<attribute_descriptor>::const_iterator end = desc_ar.end();
for (; itr!=end; ++itr) ctx->push(itr->get_name());
OGRLayer* layer = layer_.layer();
if (indexed_)
{
filter_at_point filter(pt);
return featureset_ptr(new ogr_index_featureset<filter_at_point> (ctx,
*dataset_,
*layer,
filter,
index_name_,
desc_.get_encoding()
));
}
else
{
OGRPoint point;
point.setX (pt.x);
point.setY (pt.y);
return featureset_ptr(new ogr_featureset (ctx,
*dataset_,
*layer,
point,
desc_.get_encoding()
));
}
}
return featureset_ptr();
}