DeleteEntityCommand.java

package com.temenos.interaction.commands.odata;

/*
 * #%L
 * interaction-commands-odata
 * %%
 * Copyright (C) 2012 - 2013 Temenos Holdings N.V.
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * 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.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */


import javax.ws.rs.core.Response.Status;

import org.odata4j.core.OEntityKey;
import org.odata4j.edm.EdmEntitySet;
import org.odata4j.exceptions.ODataProducerException;
import org.odata4j.producer.ODataProducer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.temenos.interaction.core.command.InteractionCommand;
import com.temenos.interaction.core.command.InteractionContext;
import com.temenos.interaction.core.command.InteractionException;

public class DeleteEntityCommand extends AbstractODataCommand implements InteractionCommand {
	private final Logger logger = LoggerFactory.getLogger(DeleteEntityCommand.class);

	public DeleteEntityCommand(ODataProducer producer) {
		super(producer);
	}
	
	protected ODataProducer getProducer() {
		return producer;
	}

	/* Implement InteractionCommand interface */

	@Override
	public Result execute(InteractionContext ctx) throws InteractionException {
		assert(ctx != null);
		assert(ctx.getCurrentState() != null);
		assert(ctx.getCurrentState().getEntityName() != null && !ctx.getCurrentState().getEntityName().equals(""));
		assert(ctx.getResource() == null);
		
		String entity = getEntityName(ctx);
		logger.debug("Deleting entity for " + entity);
		OEntityKey key = null;
		try {
			EdmEntitySet entitySet = getEdmEntitySet(entity);
			if (entitySet == null) {
				throw new InteractionException(Status.NOT_FOUND, "Entity set not found [" + entity + "]");		
			}
			assert(entity.equals(entitySet.getName()));
	
			// Create entity key (simple types only)
			try {
				key = CommandHelper.createEntityKey(getEdmMetadata(), entity, ctx.getId());
			} catch (Exception e) {
				throw new InteractionException(Status.INTERNAL_SERVER_ERROR, e);
			}
		
			// delete the entity
			producer.deleteEntity(entity, key);
		}
		catch(ODataProducerException ope) {
			logger.debug("Failed to delete entity [" + key.toKeyString() + "]: ", ope);
			throw new InteractionException(ope.getHttpStatus(), ope);
		}
		catch(Exception e) {
			logger.debug("Error while deleting entity [" + key.toKeyString() + "]: ", e);
			throw new InteractionException(Status.INTERNAL_SERVER_ERROR, e);
		}
		
		return Result.SUCCESS;
	}
}