com.rometools.modules.georss.SimpleGenerator Maven / Gradle / Ivy
/*
* Copyright 2006 Marc Wick, geonames.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.rometools.modules.georss;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import org.jdom2.Element;
import org.jdom2.Namespace;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.rometools.modules.georss.geometries.AbstractGeometry;
import com.rometools.modules.georss.geometries.AbstractRing;
import com.rometools.modules.georss.geometries.Envelope;
import com.rometools.modules.georss.geometries.LineString;
import com.rometools.modules.georss.geometries.LinearRing;
import com.rometools.modules.georss.geometries.Point;
import com.rometools.modules.georss.geometries.Polygon;
import com.rometools.modules.georss.geometries.Position;
import com.rometools.modules.georss.geometries.PositionList;
import com.rometools.rome.feed.module.Module;
import com.rometools.rome.io.ModuleGenerator;
/**
* SimpleGenerator produces georss elements in georss simple format.
*
* @author Marc Wick
* @version $Id: SimpleGenerator.java,v 1.4 2007/04/18 09:59:29 marcwick Exp $
*
*/
public class SimpleGenerator implements ModuleGenerator {
private static final Logger LOG = LoggerFactory.getLogger(SimpleGenerator.class);
private static final Set NAMESPACES;
static {
final Set nss = new HashSet();
nss.add(GeoRSSModule.SIMPLE_NS);
NAMESPACES = Collections.unmodifiableSet(nss);
}
/**
* @param posList PositionList to convert
* @return String representation
*/
private String posListToString(final PositionList posList) {
final StringBuffer sb = new StringBuffer();
for (int i = 0; i < posList.size(); ++i) {
sb.append(posList.getLatitude(i)).append(" ").append(posList.getLongitude(i)).append(" ");
}
return sb.toString();
}
/*
* (non-Javadoc)
* @see com.rometools.rome.io.ModuleGenerator#getNamespaceUri()
*/
@Override
public String getNamespaceUri() {
return GeoRSSModule.GEORSS_GEORSS_URI;
}
/*
* (non-Javadoc)
* @see com.rometools.rome.io.ModuleGenerator#getNamespaces()
*/
@Override
public Set getNamespaces() {
return NAMESPACES;
}
/*
* (non-Javadoc)
* @see com.rometools.rome.io.ModuleGenerator#generate(com.rometools.rome.feed.module.Module,
* org.jdom2.Element)
*/
@Override
public void generate(final Module module, final Element element) {
// this is not necessary, it is done to avoid the namespace definition
// in every item.
Element root = element;
while (root.getParent() != null && root.getParent() instanceof Element) {
root = (Element) element.getParent();
}
root.addNamespaceDeclaration(GeoRSSModule.SIMPLE_NS);
final GeoRSSModule geoRSSModule = (GeoRSSModule) module;
final AbstractGeometry geometry = geoRSSModule.getGeometry();
if (geometry instanceof Point) {
final Position pos = ((Point) geometry).getPosition();
final Element pointElement = new Element("point", GeoRSSModule.SIMPLE_NS);
pointElement.addContent(pos.getLatitude() + " " + pos.getLongitude());
element.addContent(pointElement);
} else if (geometry instanceof LineString) {
final PositionList posList = ((LineString) geometry).getPositionList();
final Element lineElement = new Element("line", GeoRSSModule.SIMPLE_NS);
lineElement.addContent(posListToString(posList));
element.addContent(lineElement);
} else if (geometry instanceof Polygon) {
final AbstractRing ring = ((Polygon) geometry).getExterior();
if (ring instanceof LinearRing) {
final PositionList posList = ((LinearRing) ring).getPositionList();
final Element polygonElement = new Element("polygon", GeoRSSModule.SIMPLE_NS);
polygonElement.addContent(posListToString(posList));
element.addContent(polygonElement);
} else {
LOG.error("GeoRSS simple format can't handle rings of type: " + ring.getClass().getName());
}
if (((Polygon) geometry).getInterior() != null && !((Polygon) geometry).getInterior().isEmpty()) {
LOG.error("GeoRSS simple format can't handle interior rings (ignored)");
}
} else if (geometry instanceof Envelope) {
final Envelope envelope = (Envelope) geometry;
final Element boxElement = new Element("box", GeoRSSModule.SIMPLE_NS);
boxElement.addContent(envelope.getMinLatitude() + " " + envelope.getMinLongitude() + " " + envelope.getMaxLatitude() + " "
+ envelope.getMaxLongitude());
element.addContent(boxElement);
} else {
LOG.error("GeoRSS simple format can't handle geometries of type: " + geometry.getClass().getName());
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy