/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2014, 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.process.spatialstatistics.transformation;
import java.util.NoSuchElementException;
import java.util.logging.Logger;
import org.geotools.data.DataUtilities;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.feature.collection.SubFeatureCollection;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.process.spatialstatistics.core.FeatureTypes;
import org.geotools.process.spatialstatistics.enumeration.PointLocationType;
import org.geotools.util.logging.Logging;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.Filter;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.MultiPolygon;
import com.vividsolutions.jts.geom.Point;
import com.vividsolutions.jts.geom.Polygon;
import com.vividsolutions.jts.linearref.LengthIndexedLine;
/**
* Vertices To Points SimpleFeatureCollection Implementation
*
* @author Minpa Lee, MangoSystem
*
* @source $URL$
*/
public class VerticesToPointsFeatureCollection extends GXTSimpleFeatureCollection {
protected static final Logger LOGGER = Logging
.getLogger(VerticesToPointsFeatureCollection.class);
private PointLocationType location;
private SimpleFeatureType schema;
public VerticesToPointsFeatureCollection(SimpleFeatureCollection delegate,
PointLocationType location) {
super(delegate);
this.location = location;
String typeName = delegate.getSchema().getTypeName();
this.schema = FeatureTypes.build(delegate.getSchema(), typeName, Point.class);
}
@Override
public SimpleFeatureIterator features() {
return new VerticesToPointsFeatureIterator(delegate.features(), getSchema(), location);
}
@Override
public SimpleFeatureType getSchema() {
return schema;
}
@Override
public SimpleFeatureCollection subCollection(Filter filter) {
if (filter == Filter.INCLUDE) {
return this;
}
return new SubFeatureCollection(this, filter);
}
@Override
public int size() {
switch (location) {
case Start:
case End:
case Mid:
return delegate.size();
case BothEnds:
return delegate.size() * 2;
default:
return DataUtilities.count(features());
}
}
@Override
public ReferencedEnvelope getBounds() {
switch (location) {
case All:
return delegate.getBounds();
default:
return DataUtilities.bounds(features());
}
}
static class VerticesToPointsFeatureIterator implements SimpleFeatureIterator {
private SimpleFeatureIterator delegate;
private PointLocationType location;
private int index = 0;
private int featureID = 0;
private SimpleFeatureBuilder builder;
private SimpleFeature nextFeature = null;
private SimpleFeature origFeature = null;
private String typeName;
public VerticesToPointsFeatureIterator(SimpleFeatureIterator delegate,
SimpleFeatureType schema, PointLocationType location) {
this.delegate = delegate;
this.location = location;
this.builder = new SimpleFeatureBuilder(schema);
this.typeName = schema.getTypeName();
}
public void close() {
delegate.close();
}
public boolean hasNext() {
while ((nextFeature == null && delegate.hasNext())
|| (nextFeature == null && !delegate.hasNext() && index > 0)) {
if (index == 0) {
origFeature = delegate.next();
}
// create feature
Geometry geometry = (Geometry) origFeature.getDefaultGeometry();
for (Object attribute : origFeature.getAttributes()) {
if (attribute instanceof Geometry) {
Coordinate midpoint = null;
Coordinate[] coords = geometry.getCoordinates();
switch (location) {
case All:
midpoint = coords[index];
index++;
if (index >= coords.length) {
index = 0;
origFeature = null;
}
break;
case Start:
midpoint = geometry.getCoordinate();
index = 0;
origFeature = null;
break;
case End:
midpoint = coords[coords.length - 1];
index = 0;
origFeature = null;
break;
case Mid:
Class<?> binding = geometry.getClass();
Geometry linearGeom = geometry;
if (Polygon.class.equals(binding) || MultiPolygon.class.equals(binding)) {
linearGeom = geometry.getBoundary();
}
LengthIndexedLine lil = new LengthIndexedLine(linearGeom);
midpoint = lil.extractPoint(linearGeom.getLength() / 2.0);
index = 0;
origFeature = null;
break;
case BothEnds:
if (index == 0) {
midpoint = geometry.getCoordinate();
index++;
} else {
midpoint = coords[coords.length - 1];
index = 0;
origFeature = null;
}
break;
}
attribute = geometry.getFactory().createPoint(midpoint);
}
builder.add(attribute);
}
nextFeature = builder.buildFeature(buildID(typeName, ++featureID));
builder.reset();
}
return nextFeature != null;
}
public SimpleFeature next() throws NoSuchElementException {
if (!hasNext()) {
throw new NoSuchElementException("hasNext() returned false!");
}
SimpleFeature result = nextFeature;
nextFeature = null;
return result;
}
}
}