GeneralNodeDatumSerializer.java

/* ==================================================================
 * GeneralNodeDatumSerializer.java - Aug 25, 2014 2:05:01 PM
 * 
 * Copyright 2007-2014 SolarNetwork.net Dev Team
 * 
 * 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; either version 2 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 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 net.solarnetwork.node.upload.bulkjsonwebpost;

import java.io.IOException;
import java.io.Serializable;
import java.util.List;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.StdScalarSerializer;
import net.solarnetwork.domain.GeneralDatumSamples;
import net.solarnetwork.node.domain.GeneralDatumSamplesTransformer;
import net.solarnetwork.node.domain.GeneralLocationDatum;
import net.solarnetwork.node.domain.GeneralNodeDatum;

/**
 * Serialize {@link GeneralNodeDatum} to JSON. The {@link GeneralLocationDatum}
 * is also supported.
 * 
 * @author matt
 * @version 1.3
 */
public class GeneralNodeDatumSerializer extends StdScalarSerializer<GeneralNodeDatum>
		implements Serializable {

	private static final long serialVersionUID = 4147284403831089758L;

	private List<GeneralDatumSamplesTransformer> sampleTransformers;

	/**
	 * Default constructor.
	 */
	public GeneralNodeDatumSerializer() {
		super(GeneralNodeDatum.class);
	}

	@Override
	public void serialize(GeneralNodeDatum datum, JsonGenerator generator, SerializerProvider provider)
			throws IOException, JsonGenerationException {
		generator.writeStartObject();
		generator.writeNumberField("created", datum.getCreated().getTime());
		if ( datum instanceof GeneralLocationDatum ) {
			GeneralLocationDatum loc = (GeneralLocationDatum) datum;
			generator.writeNumberField("locationId", loc.getLocationId());
		}
		generator.writeStringField("sourceId", datum.getSourceId());

		GeneralDatumSamples samples = datum.getSamples();
		List<GeneralDatumSamplesTransformer> xforms = sampleTransformers;
		if ( samples != null && xforms != null ) {
			for ( GeneralDatumSamplesTransformer xform : xforms ) {
				samples = xform.transformSamples(datum, samples);
			}
		}
		generator.writeObjectField("samples", samples);
		generator.writeEndObject();
	}

	/**
	 * Set a list of sample transformers to apply when serializing.
	 * 
	 * @param sampleTransformers
	 *        The sample transformers to apply.
	 * @since 1.2
	 */
	public void setSampleTransformers(
			List<net.solarnetwork.node.domain.GeneralDatumSamplesTransformer> sampleTransformers) {
		this.sampleTransformers = sampleTransformers;
	}

}