Java tutorial
/* * 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 com.rometools.modules.georss.geometries.AbstractGeometry; import com.rometools.modules.georss.geometries.Point; import com.rometools.modules.georss.geometries.Position; import com.rometools.rome.feed.module.Module; import com.rometools.rome.io.ModuleGenerator; /** * W3CGeoGenerator produces georss elements in georss W3C geo format. * * @author Marc Wick * @version $Id: W3CGeoGenerator.java,v 1.3 2007/04/18 09:59:30 marcwick Exp $ * */ public class W3CGeoGenerator implements ModuleGenerator { private static boolean isShort = true; private static final Set<Namespace> NAMESPACES; static { final Set<Namespace> nss = new HashSet<Namespace>(); nss.add(GeoRSSModule.W3CGEO_NS); NAMESPACES = Collections.unmodifiableSet(nss); } public static void enableDefaultPointElement() { isShort = false; } /* * (non-Javadoc) * @see com.rometools.rome.io.ModuleGenerator#getNamespaceUri() */ @Override public String getNamespaceUri() { return GeoRSSModule.GEORSS_W3CGEO_URI; } /* * (non-Javadoc) * @see com.rometools.rome.io.ModuleGenerator#getNamespaces() */ @Override public Set<Namespace> 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.W3CGEO_NS); Element pointElement = element; if (!isShort) { pointElement = new Element("Point", GeoRSSModule.W3CGEO_NS); element.addContent(pointElement); } final GeoRSSModule geoRSSModule = (GeoRSSModule) module; final AbstractGeometry geometry = geoRSSModule.getGeometry(); if (geometry instanceof Point) { final Position pos = ((Point) geometry).getPosition(); final Element latElement = new Element("lat", GeoRSSModule.W3CGEO_NS); latElement.addContent(String.valueOf(pos.getLatitude())); pointElement.addContent(latElement); final Element lngElement = new Element("long", GeoRSSModule.W3CGEO_NS); lngElement.addContent(String.valueOf(pos.getLongitude())); pointElement.addContent(lngElement); } else { System.err.println("W3C Geo format can't handle geometries of type: " + geometry.getClass().getName()); } } }