/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016.  All rights reserved.

Contact:
     SYSTAP, LLC DBA Blazegraph
     2501 Calvert ST NW #106
     Washington, DC 20008
     licenses@blazegraph.com

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

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 General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
package com.bigdata.rdf.sail.model;

import java.io.IOException;
import java.io.InputStream;
import java.io.Writer;
import java.util.List;

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectReader;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.type.TypeFactory;

/**
 * Helper class for Json Serialization of Model Objects 
 * 
 * @author beebs
 *
 */
public class JsonHelper {
	
	public static void writeRunningQueryList(Writer w,
			List<RunningQuery> rQueries) throws JsonGenerationException,
			JsonMappingException, IOException {
		final ObjectMapper mapper = new ObjectMapper();
		final TypeFactory typeFactory = mapper.getTypeFactory();
		final ObjectWriter writer = mapper.writerWithType(typeFactory
				.constructCollectionType(List.class,
						com.bigdata.rdf.sail.model.RunningQuery.class));

		writer.writeValue(w, rQueries);
	}
	
	public static List<RunningQuery> readRunningQueryList(InputStream is)
			throws JsonProcessingException, IOException {

		final ObjectMapper mapper = new ObjectMapper();
		mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
		final TypeFactory typeFactory = mapper.getTypeFactory();
		final ObjectReader reader = mapper.reader(typeFactory
				.constructCollectionType(List.class,
						com.bigdata.rdf.sail.model.RunningQuery.class));

		// TODO: Change this when upgrading to a newer Jackson version
		return (List<RunningQuery>) reader.readValue(is);

	}

}