org.isisaddons.wicket.gmap3.cpt.service.LocationLookupService.java Source code

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Here is the source code for org.isisaddons.wicket.gmap3.cpt.service.LocationLookupService.java

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/*
 *  Copyright 2013~2014 Dan Haywood
 *
 *  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 org.isisaddons.wicket.gmap3.cpt.service;

import java.io.StringReader;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.util.URIUtil;
import org.isisaddons.wicket.gmap3.cpt.applib.Location;
import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.input.SAXBuilder;
import org.apache.isis.applib.annotation.DomainService;
import org.apache.isis.applib.annotation.Programmatic;

@DomainService
public class LocationLookupService {

    // Greenwich Royal Observatory (unused)
    private static final Location DEFAULT_VALUE = new Location(51.4777479, 0.0d);

    private static final String BASEURL = "http://maps.googleapis.com/maps/api/geocode/";
    private static final String MODE = "xml";
    // is threadsafe
    private static final HttpClient httpclient = new HttpClient();

    @Programmatic
    public Location lookup(final String description) {

        final GetMethod get = new GetMethod(BASEURL + MODE);
        try {
            final String query = URIUtil.encodeQuery("?address=" + description + "&sensor=false");
            get.setQueryString(query);

            httpclient.executeMethod(get);

            final String xml = get.getResponseBodyAsString();
            final SAXBuilder builder = new SAXBuilder();
            Document doc = builder.build(new StringReader(xml));
            Element root = doc.getRootElement();
            String lat = root.getChild("result").getChild("geometry").getChild("location").getChildTextTrim("lat");
            String lon = root.getChild("result").getChild("geometry").getChild("location").getChildTextTrim("lng");
            return Location.fromString(lat + ";" + lon);
        } catch (Exception ex) {
            return null;
        }
    }
}