DateTimeAdapter.java

package com.sap.hana.cloud.samples.benefits.api.util;

import java.lang.reflect.Type;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

/**
 * java.util.Date serializer/deserializer in UTC format.
 * 
 * @author Chavdar Baikov
 */
public class DateTimeAdapter implements JsonSerializer<Date>, JsonDeserializer<Date> {

	private static final String UTC_DATE_FORMAT = "yyyy-MM-dd'T'HH:mm:ss'Z'"; //$NON-NLS-1$

	private final DateFormat dateFormat;

	public DateTimeAdapter() {
		dateFormat = new SimpleDateFormat(UTC_DATE_FORMAT, Locale.US);
		dateFormat.setTimeZone(TimeZone.getTimeZone("UTC")); //$NON-NLS-1$
	}

	@Override
	public JsonElement serialize(Date date, Type type, JsonSerializationContext jsonSerializationContext) {
		synchronized (dateFormat) {
			return new JsonPrimitive(dateFormat.format(date));
		}
	}

	@Override
	public Date deserialize(JsonElement jsonElement, Type type, JsonDeserializationContext jsonDeserializationContext) {
		try {
			synchronized (dateFormat) {
				return dateFormat.parse(jsonElement.getAsString());
			}
		} catch (ParseException e) {
			throw new JsonParseException(e);
		}
	}

}