/*******************************************************************************
 * Copyright 2017 The MITRE Corporation
 *   and the MIT Internet Trust Consortium
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/

package org.mitre.oauth2.model.convert;

import java.io.Serializable;
import java.util.Date;

import javax.persistence.AttributeConverter;
import javax.persistence.Converter;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Translates a Serializable object of certain primitive types
 * into a String for storage in the database, for use with the
 * OAuth2Request extensions map.
 *
 * This class does allow some extension data to be lost.
 *
 * @author jricher
 *
 */
@Converter
public class SerializableStringConverter implements AttributeConverter<Serializable, String> {

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

	@Override
	public String convertToDatabaseColumn(Serializable attribute) {
		if (attribute == null) {
			return null;
		} else if (attribute instanceof String) {
			return (String) attribute;
		} else if (attribute instanceof Long) {
			return attribute.toString();
		} else if (attribute instanceof Date) {
			return Long.toString(((Date)attribute).getTime());
		} else {
			logger.warn("Dropping data from request: " + attribute + " :: " + attribute.getClass());
			return null;
		}
	}

	@Override
	public Serializable convertToEntityAttribute(String dbData) {
		return dbData;
	}

}