/*
* 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.ArrayList;
import java.util.Iterator;
import java.util.Map;
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.Envelope;
import com.vividsolutions.jts.geom.Geometry;
/**
* This validation plugIn checks to see if any features intersect.
*
* <p>
* If they do then the validation failed.
* </p>
*
* @author Brent Owens, Refractions Research, Inc.
* @author $Author: dmzwiers $ (last modification)
*
*
* @source $URL$
* @version $Id$
*/
public class LinesNotIntersectValidation extends LineLineAbstractValidation {
/**
* An no argument constructor (for the Java Beans Specification)
*/
public LinesNotIntersectValidation() {
}
/**
* Ensure Lines do not intersect.
*
* <p>
* This is supposed to go off and grab the necesary features from the
* database using the envelope with the typeNames. But it doesn't yet. It
* just uses the ones passed in through parameter layers.
* </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 {
ArrayList geoms = new ArrayList(); // FIDs used for lookup to see if any match
boolean result = true;
Iterator it = layers.values().iterator();
while (it.hasNext()) // for each layer
{
SimpleFeatureSource featureSource = (SimpleFeatureSource) it.next();
SimpleFeatureIterator features = featureSource.getFeatures().features();
try {
while (features.hasNext()) // for each feature
{
// check if it intersects any of the previous features
SimpleFeature feature = features.next();
Geometry geom = (Geometry) feature.getDefaultGeometry();
for (int i = 0; i < geoms.size(); i++) // for each existing geometry
{
// I don't trust this thing to work correctly
if (geom.crosses((Geometry) geoms.get(i))) {
results.error(feature,
"Lines cross when they shouldn't.");
result = false;
}
}
geoms.add(geom);
}
} finally {
features.close(); // this is an important line
}
}
return result;
}
/**
* Override getPriority.
*
* <p>
* Sets the priority level of this validation.
* </p>
*
* @return A made up priority for this validation.
*
* @see org.geotools.validation.Validation#getPriority()
*/
public int getPriority() {
return PRIORITY_INVOLVED;
}
}