AIXMEnrichment.java

/**
 * Copyright (C) 2008 - 2014 52°North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * If the program is linked with libraries which are licensed under one of
 * the following licenses, the combination of the program with the linked
 * library is not considered a "derivative work" of the program:
 *
 *     - Apache License, version 2.0
 *     - Apache Software License, version 1.0
 *     - GNU Lesser General Public License, version 3
 *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
 *     - Common Development and Distribution License (CDDL), version 1.0
 *
 * Therefore the distribution of the program linked with libraries licensed
 * under the aforementioned licenses, is permitted by the copyright holders
 * if the distribution is compliant with both the GNU General Public
 * icense version 2 and the aforementioned licenses.
 *
 * This program 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 General
 * Public License for more details.
 */
package org.n52.ses.services.enrichment;

import java.util.ArrayList;
import java.util.List;

import org.n52.ses.api.IEnrichment;
import org.n52.ses.api.event.MapEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Class for enriching AIXM messages with additional information from a WFS.
 * 
 * @author Matthes Rieke <m.rieke@uni-muenster.de
 *
 */
public class AIXMEnrichment implements IEnrichment {

	private static final Logger logger = LoggerFactory.getLogger(AIXMEnrichment.class);
	private List<EnrichmentHandler> handlers;


	/**
	 * Constructor, initializes connectors to WFSs. 
	 */
	public AIXMEnrichment() {
		this.handlers = new ArrayList<EnrichmentHandler>();
		this.handlers.add(new WFSHandler());
		this.handlers.add(new WPSHandler());
	}


	@Override
	public MapEvent enrichEvent(MapEvent mapEvent) {
		List<EnrichmentHandler> handler = resolveHandler((String) mapEvent.get(MapEvent.FEATURE_TYPE_KEY));

		String identifier = (String) mapEvent.get(MapEvent.IDENTIFIER_VALUE_KEY);
		String featureType = (String) mapEvent.get(MapEvent.FEATURE_TYPE_KEY);

		for (EnrichmentHandler enrichmentHandler : handler) {
			try {
				if (enrichmentHandler.enrichFeature(mapEvent, identifier, featureType))
					break;
			} catch (Exception e) {
				logger.warn(e.getMessage());
			}
		}

		return mapEvent;
	}


	private List<EnrichmentHandler> resolveHandler(String featureType) {
		List<EnrichmentHandler> resolved = new ArrayList<EnrichmentHandler>();

		if (featureType == null) return resolved;

		for (EnrichmentHandler h : this.handlers) {
			if (h.canHandle(featureType)) {
				resolved.add(h);
			}
		}
		return resolved;
	}


}