/*
 * Copyright 2016-2019 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.integration.mongodb.support;

import java.util.HashSet;
import java.util.Set;

import org.bson.types.Binary;

import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.Converter;
import org.springframework.core.convert.converter.GenericConverter;
import org.springframework.core.serializer.support.SerializingConverter;
import org.springframework.data.convert.ReadingConverter;
import org.springframework.data.convert.WritingConverter;
import org.springframework.integration.support.converter.WhiteListDeserializingConverter;
import org.springframework.messaging.Message;

/**
 * A {@link GenericConverter} implementation to convert {@link Message} to
 * serialized {@link byte[]} to store {@link Message} to the MongoDB.
 * And vice versa - to convert {@link byte[]} from the MongoDB to the {@link Message}.

 * @author Artem Bilan
 * @author Gary Russell
 * @since 4.2.10
 * @deprecated since 5.0 in favor of {@link MessageToBinaryConverter} and {@link BinaryToMessageConverter}
 */
@WritingConverter
@ReadingConverter
@Deprecated
public class MongoDbMessageBytesConverter implements GenericConverter {

	private final Converter<Object, byte[]> serializingConverter = new SerializingConverter();

	private final WhiteListDeserializingConverter deserializingConverter = new WhiteListDeserializingConverter();

	@Override
	public Set<ConvertiblePair> getConvertibleTypes() {
		Set<ConvertiblePair> convertiblePairs = new HashSet<>();
		convertiblePairs.add(new ConvertiblePair(Message.class, Binary.class));
		convertiblePairs.add(new ConvertiblePair(Binary.class, Message.class));
		return convertiblePairs;
	}

	@Override
	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
		if (source == null) {
			return null;
		}
		if (Message.class.isAssignableFrom(sourceType.getObjectType())) {
			return new Binary(this.serializingConverter.convert(source));
		}
		else {
			return this.deserializingConverter.convert(((Binary) source).getData());
		}
	}

	/**
	 * Add patterns for packages/classes that are allowed to be deserialized. A class can
	 * be fully qualified or a wildcard '*' is allowed at the beginning or end of the
	 * class name. Examples: {@code com.foo.*}, {@code *.MyClass}.
	 * @param patterns the patterns.
	 */
	public void addWhiteListPatterns(String... patterns) {
		this.deserializingConverter.addWhiteListPatterns(patterns);
	}

}
