/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2004-2008, Open Source Geospatial Foundation (OSGeo)
*
* 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;
* version 2.1 of the License.
*
* 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.
*/
package org.geotools.validation.spatial;
import java.util.Map;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.validation.ValidationResults;
import org.opengis.feature.simple.SimpleFeature;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.LineSegment;
import com.vividsolutions.jts.geom.LineString;
/**
* PointCoveredByLineValidation purpose.
*
* <p>
* Checks to ensure the Line does not have a psuedo-node.
* </p>
*
* @author dzwiers, Refractions Research, Inc.
* @author $Author: dmzwiers $ (last modification)
*
*
* @source $URL$
* @version $Id$
*/
public class LineNoPseudoNodeValidation extends LineAbstractValidation {
private int degreesAllowable;
/**
* PointCoveredByLineValidation constructor.
*
* <p>
* Super
* </p>
*/
public LineNoPseudoNodeValidation() {
super();
}
/**
* Ensure Line does not have a psuedo-node.
*
* <p></p>
*
* @param layers a HashMap of key="TypeName" value="FeatureSource"
* @param envelope The bounding box of modified features
* @param results Storage for the error and warning messages
*
* @return True if no features intersect. If they do then the validation
* failed.
*
* @throws Exception DOCUMENT ME!
*
* @see org.geotools.validation.IntegrityValidation#validate(java.util.Map,
* com.vividsolutions.jts.geom.Envelope,
* org.geotools.validation.ValidationResults)
*/
public boolean validate(Map layers, Envelope envelope,
ValidationResults results) throws Exception {
boolean r = true;
SimpleFeatureSource fsLine = (SimpleFeatureSource) layers.get(getLineTypeRef());
SimpleFeatureCollection fcLine = fsLine.getFeatures();
SimpleFeatureIterator fLine = fcLine.features();
while(fLine.hasNext()){
SimpleFeature line = fLine.next();
Geometry lineGeom = (Geometry) line.getDefaultGeometry();
if(envelope.contains(lineGeom.getEnvelopeInternal())){
// check for valid comparison
if(LineString.class.isAssignableFrom(lineGeom.getClass())){
Coordinate[] c = lineGeom.getCoordinates();
int i=0;
while(i+2<c.length){
LineSegment ls1 = new LineSegment(c[i],c[i+1]);
LineSegment ls2 = new LineSegment(c[i+1],c[i+2]);
double a1 = ls1.angle();
double a2 = ls2.angle();
if(!((a1-degreesAllowable)<a1 && (a1+degreesAllowable)>a2)){
results.error(line,"Atleast one node was too close to the other the perpendicular line between the node's two neighbours.");
i = c.length;
}
}
}else{
results.warning(line,"Invalid type: this feature is not a derivative of a LineString");
}
}
}
return r;
}
/**
* Access degreesAllowable property.
*
* @return Returns the degreesAllowable.
*/
public int getDegreesAllowable() {
return degreesAllowable;
}
/**
* Set degreesAllowable to degreesAllowable.
*
* @param degreesAllowable The degreesAllowable to set.
*/
public void setDegreesAllowable(int degreesAllowable) {
this.degreesAllowable = degreesAllowable;
}
}