/*
 * This is eMonocot, a global online biodiversity information resource.
 *
 * Copyright © 2011–2015 The Board of Trustees of the Royal Botanic Gardens, Kew and The University of Oxford
 *
 * eMonocot 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.
 *
 * eMonocot 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 Affero General Public License for more details.
 *
 * The complete text of the GNU Affero General Public License is in the source repository as the file
 * ‘COPYING’.  It is also available from <http://www.gnu.org/licenses/>.
 */
package org.emonocot.model.marshall.json;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import org.emonocot.api.Service;
import org.emonocot.model.Base;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author ben
 *
 * @param <T>
 */
public abstract class BaseDeserializer<T extends Base> extends
JsonDeserializer<T> {

	private static Logger logger = LoggerFactory.getLogger(BaseDeserializer.class);

	/**
	 *
	 */
	protected Service<T> service;

	/**
	 *
	 */
	protected Class<T> type;

	/**
	 *
	 * @param newType Set the type
	 */
	public BaseDeserializer(final Class<T> newType) {
		type = newType;
	}

	/**
	 *
	 * @param newService
	 *            Set the service
	 */
	public final void setService(final Service<T> newService) {
		this.service = newService;
	}

	@Override
	public T deserialize(final JsonParser jsonParser,
			final DeserializationContext deserializationContext)
					throws IOException {
		String identifier = jsonParser.getText();
		/**
		 * Hack for now should allow client side to
		 * set "return lazy initialized proxy objs"
		 */
		if (service != null) {
			logger.debug("service is not null, returning object");
			return service.load(identifier);
		} else {
			try {
				logger.debug("service is null, returning new object");
				T t = type.newInstance();
				t.setIdentifier(identifier);
				return t;
			} catch (InstantiationException ie) {
				throw new JsonParseException(ie.getMessage(),
						jsonParser.getCurrentLocation());
			} catch (IllegalAccessException iae) {
				throw new JsonParseException(iae.getMessage(),
						jsonParser.getCurrentLocation());
			}
		}
	}
}