root / trunk / libraries / libFMap / src / com / iver / cit / gvsig / fmap / drivers / featureiterators / SpatialQueryFeatureIterator.java @ 13873
History | View | Annotate | Download (11.5 KB)
| 1 |
/*
|
|---|---|
| 2 |
* Created on 12-abr-2007
|
| 3 |
*
|
| 4 |
* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
|
| 5 |
*
|
| 6 |
* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
|
| 7 |
*
|
| 8 |
* This program is free software; you can redistribute it and/or
|
| 9 |
* modify it under the terms of the GNU General Public License
|
| 10 |
* as published by the Free Software Foundation; either version 2
|
| 11 |
* of the License, or (at your option) any later version.
|
| 12 |
*
|
| 13 |
* This program is distributed in the hope that it will be useful,
|
| 14 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 15 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
| 16 |
* GNU General Public License for more details.
|
| 17 |
*
|
| 18 |
* You should have received a copy of the GNU General Public License
|
| 19 |
* along with this program; if not, write to the Free Software
|
| 20 |
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
|
| 21 |
*
|
| 22 |
* For more information, contact:
|
| 23 |
*
|
| 24 |
* Generalitat Valenciana
|
| 25 |
* Conselleria d'Infraestructures i Transport
|
| 26 |
* Av. Blasco Ib??ez, 50
|
| 27 |
* 46010 VALENCIA
|
| 28 |
* SPAIN
|
| 29 |
*
|
| 30 |
* +34 963862235
|
| 31 |
* gvsig@gva.es
|
| 32 |
* www.gvsig.gva.es
|
| 33 |
*
|
| 34 |
* or
|
| 35 |
*
|
| 36 |
* IVER T.I. S.A
|
| 37 |
* Salamanca 50
|
| 38 |
* 46005 Valencia
|
| 39 |
* Spain
|
| 40 |
*
|
| 41 |
* +34 963163400
|
| 42 |
* dac@iver.es
|
| 43 |
*/
|
| 44 |
/* CVS MESSAGES:
|
| 45 |
*
|
| 46 |
* $Id: SpatialQueryFeatureIterator.java 13873 2007-09-19 16:02:29Z azabala $
|
| 47 |
* $Log$
|
| 48 |
* Revision 1.4 2007-09-19 16:02:29 azabala
|
| 49 |
* bug solved (feature returned by iterator has the attributes of the next record)
|
| 50 |
*
|
| 51 |
* Revision 1.3 2007/06/07 09:30:09 azabala
|
| 52 |
* refactor of BOUND FACTOR
|
| 53 |
*
|
| 54 |
* Revision 1.2 2007/06/06 18:03:03 azabala
|
| 55 |
* bug fixed
|
| 56 |
*
|
| 57 |
* Revision 1.1 2007/05/29 19:08:11 azabala
|
| 58 |
* first version in cvs
|
| 59 |
*
|
| 60 |
* Revision 1.1 2007/04/19 17:27:58 azabala
|
| 61 |
* first version in cvs
|
| 62 |
*
|
| 63 |
*
|
| 64 |
*/
|
| 65 |
package com.iver.cit.gvsig.fmap.drivers.featureiterators; |
| 66 |
|
| 67 |
import java.awt.geom.Rectangle2D; |
| 68 |
|
| 69 |
import org.cresques.cts.ICoordTrans; |
| 70 |
import org.cresques.cts.IProjection; |
| 71 |
import org.geotools.resources.geometry.XRectangle2D; |
| 72 |
|
| 73 |
import com.hardcode.gdbms.driver.exceptions.ReadDriverException; |
| 74 |
import com.hardcode.gdbms.engine.values.Value; |
| 75 |
import com.iver.cit.gvsig.exceptions.expansionfile.ExpansionFileReadException; |
| 76 |
import com.iver.cit.gvsig.fmap.core.DefaultFeature; |
| 77 |
import com.iver.cit.gvsig.fmap.core.IFeature; |
| 78 |
import com.iver.cit.gvsig.fmap.core.IGeometry; |
| 79 |
import com.iver.cit.gvsig.fmap.drivers.BoundedShapes; |
| 80 |
import com.iver.cit.gvsig.fmap.layers.ReadableVectorial; |
| 81 |
|
| 82 |
public class SpatialQueryFeatureIterator extends DefaultFeatureIterator { |
| 83 |
|
| 84 |
/**
|
| 85 |
* region for which features we are iterating
|
| 86 |
*/
|
| 87 |
protected Rectangle2D rect; |
| 88 |
|
| 89 |
/**
|
| 90 |
* Checks feature geometries to see if intersects the given extent filter
|
| 91 |
*/
|
| 92 |
protected ISpatialCheck spatialChecker;
|
| 93 |
|
| 94 |
/**
|
| 95 |
* Feature which will be returned the next time
|
| 96 |
*/
|
| 97 |
IFeature nextFeature = null;
|
| 98 |
|
| 99 |
/**
|
| 100 |
* Proportion of query extent area and layer extent area
|
| 101 |
* to use boundedshapes capability (reading bounds without
|
| 102 |
* reading its geometry)
|
| 103 |
*
|
| 104 |
*/
|
| 105 |
public static final double BOUNDED_SHAPES_FACTOR = 4.0d; |
| 106 |
|
| 107 |
/**
|
| 108 |
* Constructor.
|
| 109 |
*
|
| 110 |
* @param source
|
| 111 |
* vectorial data source
|
| 112 |
* @param sourceProj
|
| 113 |
* original projection of the data (it could be null)
|
| 114 |
* @param targetProj
|
| 115 |
* projection of the returned features
|
| 116 |
* @param fieldNames
|
| 117 |
* @param spatialQuery
|
| 118 |
* @throws ReadDriverException
|
| 119 |
*/
|
| 120 |
public SpatialQueryFeatureIterator(ReadableVectorial source,
|
| 121 |
IProjection sourceProj, IProjection targetProj, |
| 122 |
String[] fieldNames, Rectangle2D spatialQuery, boolean fastIteration) |
| 123 |
throws ReadDriverException {
|
| 124 |
super(source, sourceProj, targetProj, fieldNames);
|
| 125 |
setRect(spatialQuery); |
| 126 |
if(fastIteration)
|
| 127 |
spatialChecker = new FastSpatialCheck();
|
| 128 |
else
|
| 129 |
spatialChecker = new PrecisseSpatialCheck();
|
| 130 |
} |
| 131 |
|
| 132 |
public Rectangle2D getRect() { |
| 133 |
return rect;
|
| 134 |
} |
| 135 |
|
| 136 |
public void setRect(Rectangle2D rect) { |
| 137 |
//by design, rect Rectangle2D must be in the target reprojection
|
| 138 |
//if targetReprojection != sourceReprojection, we are going to reproject
|
| 139 |
//rect to the source reprojection (is faster).
|
| 140 |
//once spatial check is made, result features will be reprojected in the inverse direction
|
| 141 |
if(this.targetProjection != null && |
| 142 |
this.sourceProjection != null && |
| 143 |
this.targetProjection.getAbrev() != this.sourceProjection.getAbrev()){ |
| 144 |
ICoordTrans trans = targetProjection.getCT(sourceProjection); |
| 145 |
rect = trans.convert(rect); |
| 146 |
} |
| 147 |
this.rect = rect;
|
| 148 |
} |
| 149 |
|
| 150 |
public boolean hasNext() throws ReadDriverException { |
| 151 |
try {
|
| 152 |
while(true){ |
| 153 |
if(currentFeature >= source.getShapeCount())
|
| 154 |
return false; |
| 155 |
if(spatialChecker.intersects(rect, currentFeature)){
|
| 156 |
//we only update the counter if spatialChecker could read the geometry
|
| 157 |
//if it is boundedshape it doesnt read the geometry, so we need to read
|
| 158 |
//currentFeature again
|
| 159 |
// if(spatialChecker.returnShapes())
|
| 160 |
// currentFeature++;
|
| 161 |
break;
|
| 162 |
} |
| 163 |
else
|
| 164 |
currentFeature++; |
| 165 |
}//while
|
| 166 |
|
| 167 |
|
| 168 |
//here, currentFeature intersects with the rectangle2d filter
|
| 169 |
IGeometry geom = null;
|
| 170 |
IFeature feat = null;
|
| 171 |
if(spatialChecker.returnShapes()){
|
| 172 |
geom = spatialChecker.getLastGeometry(); |
| 173 |
}else{
|
| 174 |
geom = source.getShape(currentFeature); |
| 175 |
// currentFeature++;
|
| 176 |
reprojectIfNecessary(geom); |
| 177 |
} |
| 178 |
Value[] regAtt = getValues(currentFeature);
|
| 179 |
feat = new DefaultFeature(geom, regAtt, currentFeature + ""); |
| 180 |
nextFeature = feat; |
| 181 |
currentFeature++; |
| 182 |
return true; |
| 183 |
} catch (ExpansionFileReadException e) {
|
| 184 |
throw new ReadDriverException( |
| 185 |
"Error accediendo a datos del driver durante la iteracion",
|
| 186 |
e); |
| 187 |
} |
| 188 |
} |
| 189 |
|
| 190 |
public IFeature next() throws ReadDriverException { |
| 191 |
return nextFeature;
|
| 192 |
} |
| 193 |
|
| 194 |
/**
|
| 195 |
* Classes that chekcs if a specified feature intersects with a given Rectangle2D must
|
| 196 |
* implement this interface.
|
| 197 |
*
|
| 198 |
* This interface is necessary because there are many approach to do that
|
| 199 |
* (an exact intersection, an intersection based in bounds2d, etc)
|
| 200 |
*
|
| 201 |
*
|
| 202 |
* @author azabala
|
| 203 |
*
|
| 204 |
*/
|
| 205 |
interface ISpatialCheck { |
| 206 |
public boolean intersects(Rectangle2D extent, int featureIndex) |
| 207 |
throws ExpansionFileReadException, ReadDriverException;
|
| 208 |
|
| 209 |
/**
|
| 210 |
* Tells if this spatialcheck could return the geometry of the features
|
| 211 |
* (or if it is boundedshapes based, needs another driver access operation)
|
| 212 |
* @return
|
| 213 |
*/
|
| 214 |
public boolean returnShapes(); |
| 215 |
/**
|
| 216 |
* Returns the last readed geometry (if the spatialcheck do that)
|
| 217 |
* @return
|
| 218 |
*/
|
| 219 |
public IGeometry getLastGeometry();
|
| 220 |
|
| 221 |
/**
|
| 222 |
* Return the index of the last readed geometry
|
| 223 |
* @return
|
| 224 |
*/
|
| 225 |
public int getIndexOfLast(); |
| 226 |
|
| 227 |
|
| 228 |
} |
| 229 |
|
| 230 |
|
| 231 |
|
| 232 |
|
| 233 |
/**
|
| 234 |
* All classes that return the bounds Rectangle2D of a feature must
|
| 235 |
* implement this interface.
|
| 236 |
*
|
| 237 |
* @author azabala
|
| 238 |
*
|
| 239 |
*/
|
| 240 |
interface BoundsProvider { |
| 241 |
/**
|
| 242 |
* Returns the bound of the specified feature index
|
| 243 |
*
|
| 244 |
* @param featureIndex
|
| 245 |
* @return
|
| 246 |
* @throws ExpansionFileReadException
|
| 247 |
* @throws ReadDriverException
|
| 248 |
*/
|
| 249 |
public Rectangle2D getBounds(int featureIndex) |
| 250 |
throws ExpansionFileReadException, ReadDriverException;
|
| 251 |
|
| 252 |
/**
|
| 253 |
* Tells if this boundsProvider could returns shapes
|
| 254 |
*
|
| 255 |
* @return
|
| 256 |
*/
|
| 257 |
public boolean returnShapes(); |
| 258 |
|
| 259 |
/**
|
| 260 |
* Returns the last geometry readed, if the boundsProvider could do that
|
| 261 |
*
|
| 262 |
* @return
|
| 263 |
*/
|
| 264 |
public IGeometry getLastGeometry();
|
| 265 |
} |
| 266 |
|
| 267 |
|
| 268 |
|
| 269 |
|
| 270 |
/**
|
| 271 |
* BoundsProvider that uses a BoundedShapes (faster than others)
|
| 272 |
*
|
| 273 |
* @author azabala
|
| 274 |
*
|
| 275 |
*/
|
| 276 |
class BoundedShapesProvider implements BoundsProvider { |
| 277 |
BoundedShapes boundedShapes; |
| 278 |
|
| 279 |
BoundedShapesProvider(BoundedShapes boundedShapes) {
|
| 280 |
this.boundedShapes = boundedShapes;
|
| 281 |
} |
| 282 |
|
| 283 |
public Rectangle2D getBounds(int featureIndex) |
| 284 |
throws ExpansionFileReadException, ReadDriverException {
|
| 285 |
return boundedShapes.getShapeBounds(featureIndex);
|
| 286 |
} |
| 287 |
|
| 288 |
public boolean returnShapes() { |
| 289 |
return false; |
| 290 |
} |
| 291 |
|
| 292 |
public IGeometry getLastGeometry() {
|
| 293 |
return null; |
| 294 |
} |
| 295 |
|
| 296 |
} |
| 297 |
|
| 298 |
|
| 299 |
|
| 300 |
|
| 301 |
/**
|
| 302 |
* BoundsProvider that returns feature bounds from the feature geometry
|
| 303 |
*
|
| 304 |
* @author azabala
|
| 305 |
*
|
| 306 |
*/
|
| 307 |
class IGeometryBoundProvider implements BoundsProvider { |
| 308 |
/**
|
| 309 |
* Adapter of a given driver from which we read the features bounds.
|
| 310 |
*/
|
| 311 |
ReadableVectorial source; |
| 312 |
|
| 313 |
IGeometry lastGeometry; |
| 314 |
|
| 315 |
IGeometryBoundProvider(ReadableVectorial sourceOfFeatures) {
|
| 316 |
this.source = sourceOfFeatures;
|
| 317 |
} |
| 318 |
|
| 319 |
public Rectangle2D getBounds(int featureIndex) |
| 320 |
throws ExpansionFileReadException, ReadDriverException {
|
| 321 |
lastGeometry = source.getShape(featureIndex); |
| 322 |
//bounds2D is in the original projection
|
| 323 |
Rectangle2D solution = lastGeometry.getBounds2D();
|
| 324 |
//the readed geometry in the specified projection
|
| 325 |
reprojectIfNecessary(this.lastGeometry);
|
| 326 |
return solution;
|
| 327 |
} |
| 328 |
|
| 329 |
public IGeometry getLastGeometry() {
|
| 330 |
return lastGeometry;
|
| 331 |
} |
| 332 |
|
| 333 |
public boolean returnShapes() { |
| 334 |
return true; |
| 335 |
} |
| 336 |
|
| 337 |
} |
| 338 |
|
| 339 |
|
| 340 |
|
| 341 |
|
| 342 |
/**
|
| 343 |
* Checks if the specified features intersects with rectangle2D instances in
|
| 344 |
* a rough but fast manner.
|
| 345 |
*
|
| 346 |
*/
|
| 347 |
class FastSpatialCheck implements ISpatialCheck { |
| 348 |
BoundsProvider boundProvider; |
| 349 |
int lastIndex;
|
| 350 |
|
| 351 |
|
| 352 |
FastSpatialCheck() {
|
| 353 |
try {
|
| 354 |
if(isBoundedShapesNecessary()){
|
| 355 |
if (source instanceof BoundedShapes){ |
| 356 |
boundProvider = new BoundedShapesProvider(
|
| 357 |
(BoundedShapes) source); |
| 358 |
}else if (source.getDriver() instanceof BoundedShapes){ |
| 359 |
boundProvider = new BoundedShapesProvider(
|
| 360 |
(BoundedShapes) source.getDriver()); |
| 361 |
} |
| 362 |
}else{
|
| 363 |
boundProvider = new IGeometryBoundProvider(source);
|
| 364 |
} |
| 365 |
} catch (ExpansionFileReadException e) {
|
| 366 |
// TODO Auto-generated catch block
|
| 367 |
e.printStackTrace(); |
| 368 |
boundProvider = new IGeometryBoundProvider(source);
|
| 369 |
} catch (ReadDriverException e) {
|
| 370 |
// TODO Auto-generated catch block
|
| 371 |
e.printStackTrace(); |
| 372 |
boundProvider = new IGeometryBoundProvider(source);
|
| 373 |
} |
| 374 |
} |
| 375 |
|
| 376 |
|
| 377 |
protected boolean isBoundedShapesNecessary() throws ReadDriverException, ExpansionFileReadException { |
| 378 |
Rectangle2D driverExtent = source.getFullExtent();
|
| 379 |
double areaExtent = rect.getWidth() * rect.getHeight();
|
| 380 |
double areaFullExtent = driverExtent.getWidth() *
|
| 381 |
driverExtent.getHeight(); |
| 382 |
return areaExtent < (areaFullExtent / BOUNDED_SHAPES_FACTOR);
|
| 383 |
|
| 384 |
} |
| 385 |
|
| 386 |
public boolean intersects(Rectangle2D extent, int featureIndex) |
| 387 |
throws ExpansionFileReadException, ReadDriverException {
|
| 388 |
this.lastIndex = featureIndex;
|
| 389 |
Rectangle2D featureBounds = boundProvider.getBounds(featureIndex);
|
| 390 |
return XRectangle2D.intersectInclusive(extent, featureBounds);
|
| 391 |
} |
| 392 |
|
| 393 |
public BoundsProvider getBoundsProvider() {
|
| 394 |
return boundProvider;
|
| 395 |
} |
| 396 |
|
| 397 |
public boolean returnShapes() { |
| 398 |
return boundProvider.returnShapes();
|
| 399 |
} |
| 400 |
|
| 401 |
public IGeometry getLastGeometry() {
|
| 402 |
return boundProvider.getLastGeometry();
|
| 403 |
} |
| 404 |
|
| 405 |
public int getIndexOfLast() { |
| 406 |
return lastIndex;
|
| 407 |
} |
| 408 |
|
| 409 |
}// FastSpatialCheck
|
| 410 |
|
| 411 |
|
| 412 |
/**
|
| 413 |
* Checks if the specified features intersect with rectangle2D instances in
|
| 414 |
* a precisse manner
|
| 415 |
*
|
| 416 |
* @author azabala
|
| 417 |
*
|
| 418 |
*/
|
| 419 |
|
| 420 |
class PrecisseSpatialCheck implements ISpatialCheck { |
| 421 |
IGeometry lastGeometry; |
| 422 |
int lastIndex;
|
| 423 |
|
| 424 |
PrecisseSpatialCheck() {
|
| 425 |
} |
| 426 |
|
| 427 |
public boolean intersects(Rectangle2D extent, int featureIndex) |
| 428 |
throws ExpansionFileReadException, ReadDriverException {
|
| 429 |
this.lastIndex = featureIndex;
|
| 430 |
this.lastGeometry = source.getShape(lastIndex);
|
| 431 |
//the spatial check is made in the original projection
|
| 432 |
boolean solution = lastGeometry.fastIntersects(rect.getMinX(),
|
| 433 |
rect.getMinY(), rect.getWidth(), rect.getHeight()); |
| 434 |
//but the solution is returned in the new projection (if applies)
|
| 435 |
reprojectIfNecessary(lastGeometry); |
| 436 |
return solution;
|
| 437 |
} |
| 438 |
|
| 439 |
public boolean returnShapes() { |
| 440 |
return true; |
| 441 |
} |
| 442 |
|
| 443 |
public IGeometry getLastGeometry() {
|
| 444 |
return lastGeometry;
|
| 445 |
} |
| 446 |
|
| 447 |
public int getIndexOfLast() { |
| 448 |
return lastIndex;
|
| 449 |
} |
| 450 |
} |
| 451 |
} |