at.ait.dme.yuma.suite.apps.map.server.geo.MapMetadataServiceImpl.java Source code

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Here is the source code for at.ait.dme.yuma.suite.apps.map.server.geo.MapMetadataServiceImpl.java

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/*
 * Copyright 2008-2010 Austrian Institute of Technology
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they
 * will be approved by the European Commission - subsequent
 * versions of the EUPL (the "Licence");
 * you may not use this work except in compliance with the
 * Licence.
 * You may obtain a copy of the Licence at:
 *
 * http://ec.europa.eu/idabc/eupl
 *
 * Unless required by applicable law or agreed to in
 * writing, software distributed under the Licence is
 * distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied.
 * See the Licence for the specific language governing
 * permissions and limitations under the Licence.
 */

package at.ait.dme.yuma.suite.apps.map.server.geo;

import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.log4j.Logger;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;

import at.ait.dme.yuma.suite.apps.map.shared.geo.MapMetadata;
import at.ait.dme.yuma.suite.apps.map.shared.server.MapMetadataService;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;

@SuppressWarnings("serial")
public class MapMetadataServiceImpl extends RemoteServiceServlet implements MapMetadataService {

    private static Logger logger = Logger.getLogger(MapMetadataServiceImpl.class);

    private static final String ELEMENT_TITLE = "title";
    private static final String ELEMENT_AUTHOR = "author";
    private static final String ELEMENT_DATE = "date";
    private static final String ELEMENT_SOURCE = "source";
    private static final String ELEMENT_DESCRIPTION = "description";
    private static final String ELEMENT_THUMBNAIL = "thumbnail";
    private static final String ELEMENT_LINK = "link";

    @Override
    public MapMetadata getMetadata(String url) {
        try {
            GetMethod getMetadata = new GetMethod(url);
            int statusCode = new HttpClient().executeMethod(getMetadata);
            if (statusCode == HttpStatus.SC_OK) {
                return fromXML(getMetadata.getResponseBodyAsStream());
            }
        } catch (Exception e) {
            logger.info("No metadata found for " + url + " (" + e.getClass() + ")");
        }
        return null;
    }

    private MapMetadata fromXML(InputStream xml) {
        try {
            MapMetadata meta = new MapMetadata();

            Document document = new SAXBuilder().build(new InputStreamReader(xml));
            Element e = document.getRootElement();

            meta.setTitle(e.getChildText(ELEMENT_TITLE));
            meta.setAuthor(e.getChildText(ELEMENT_AUTHOR));
            meta.setDate(e.getChildText(ELEMENT_DATE));

            meta.setSource(e.getChildText(ELEMENT_SOURCE));
            meta.setDescription(e.getChildText(ELEMENT_DESCRIPTION));
            meta.setThumbnail(e.getChildText(ELEMENT_THUMBNAIL));
            meta.setLink(e.getChildText(ELEMENT_LINK));

            return meta;
        } catch (Exception e) {
            logger.info("Unable to parse map metadata: " + e.getMessage());
        }
        return null;
    }

}