GetGeoResourceHandler.java

/**
 * Copyright (c) 2011 Ontology Engineering Group, 
 * Departamento de Inteligencia Artificial,
 * Facultad de Informetica, Universidad 
 * Politecnica de Madrid, Spain
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package es.upm.fi.dia.oeg.map4rdf.server.command;

import net.customware.gwt.dispatch.server.ActionHandler;
import net.customware.gwt.dispatch.server.ExecutionContext;
import net.customware.gwt.dispatch.shared.ActionException;

import com.google.inject.Inject;

import es.upm.fi.dia.oeg.map4rdf.client.action.GetGeoResource;
import es.upm.fi.dia.oeg.map4rdf.client.action.SingletonResult;
import es.upm.fi.dia.oeg.map4rdf.server.conf.multiple.MultipleConfigurations;
import es.upm.fi.dia.oeg.map4rdf.server.dao.DaoException;
import es.upm.fi.dia.oeg.map4rdf.share.GeoResource;

/**
 * @author Alexander De Leon
 */
public class GetGeoResourceHandler implements ActionHandler<GetGeoResource, SingletonResult<GeoResource>> {

	private MultipleConfigurations configurations;
   
	@Inject
	public GetGeoResourceHandler(MultipleConfigurations configurations) {
		this.configurations = configurations;
	}

	@Override
	public SingletonResult<GeoResource> execute(GetGeoResource action, ExecutionContext context) throws ActionException {
		String uri = action.getUri();
		if (uri == null || uri.length() == 0) {
			throw new ActionException("Invalid URI: " + uri);
		}
		if(!configurations.existsConfiguration(action.getConfigID())){
			throw new ActionException("Bad Config ID");
		}
		try {
			GeoResource resource = configurations.getConfiguration(action.getConfigID()).getMap4rdfDao().getGeoResource(uri);
			return new SingletonResult<GeoResource>(resource);
		} catch (DaoException e) {
			throw new ActionException("Data access error", e);
		}
	}

	@Override
	public Class<GetGeoResource> getActionType() {
		return GetGeoResource.class;
	}

	@Override
	public void rollback(GetGeoResource action, SingletonResult<GeoResource> result, ExecutionContext context)
			throws ActionException {
		// nothing to do

	}

}