GetSubjectLabelHandler.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 org.apache.log4j.Logger;

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.GetSubjectLabel;
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;

/**
 * @author Filip
 */
public class GetSubjectLabelHandler implements
		ActionHandler<GetSubjectLabel, SingletonResult<String>> {

	private MultipleConfigurations configurations;
	private Logger logger = Logger.getLogger(GetSubjectLabelHandler.class);

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

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

	@Override
	public SingletonResult<String> execute(GetSubjectLabel action,
			ExecutionContext context) throws ActionException {
		if (!configurations.existsConfiguration(action.getConfigID())) {
			throw new ActionException("Bad Config ID");
		}
		String label;
		try {
			label = configurations.getConfiguration(action.getConfigID())
					.getMap4rdfDao().getLabel(action.getSubjectLabel());
		} catch (DaoException e) {
			logger.error(e);
			return new SingletonResult<String>("");
		}
		return new SingletonResult<String>(label);
	}

	@Override
	public void rollback(GetSubjectLabel action,
			SingletonResult<String> result, ExecutionContext context)
			throws ActionException {

	}
}