/**
 * Helios, OpenSource Monitoring
 * Brought to you by the Helios Development Group
 *
 * Copyright 2007, Helios Development Group and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 
 *
 */
package org.helios.apmrouter.catalog.api.impl;

import java.util.List;


import org.hibernate.Session;

/**
 * <p>Title: ExecutableQuery</p>
 * <p>Description: Defines a class for which an instance is returned from the {@literal JSONQueryParser#parse(String)} which can be executed.</p>
 * <p>Company: Helios Development Group LLC</p>
 * @author Whitehead (nwhitehead AT heliosdev DOT org)
 * <p><code>org.helios.apmrouter.catalog.api.impl.ExecutableQuery</code></p>
 */

public interface ExecutableQuery {
	/**
	 * Executes the {@literal JSONQueryParser#parse(String)} parsed query
	 * @param session The hibernate session to execute with
	 * @return The result of the query
	 */
	public List<?> execute(Session session);
	
	/**
	 * Executes the {@literal JSONQueryParser#parse(String)} parsed query for a unique result
	 * @param session The hibernate session to execute with
	 * @return The single unique result of the query
	 */
	public Object unique(Session session);	
}