/*
 * Copyright 2014-2019 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.data.elasticsearch.core;

import java.io.IOException;
import java.util.Map;

import org.springframework.lang.Nullable;

/**
 * DocumentMapper interface, it will allow to customize how we mapping object to json
 *
 * @author Artur Konczak
 * @author Rizwan Idrees
 * @author Mohsin Husen
 * @author Christoph Strobl
 */
public interface EntityMapper {

	String mapToString(Object object) throws IOException;

	<T> T mapToObject(String source, Class<T> clazz) throws IOException;

	/**
	 * Map the given {@literal source} to {@link Map}.
	 *
	 * @param source must not be {@literal null}.
	 * @return never {@literal null}
	 * @since 3.2
	 */
	Map<String, Object> mapObject(Object source);

	/**
	 * Map the given {@link Map} into an instance of the {@literal targetType}.
	 *
	 * @param source must not be {@literal null}.
	 * @param targetType must not be {@literal null}.
	 * @param <T>
	 * @return can be {@literal null}.
	 * @since 3.2
	 */
	@Nullable
	<T> T readObject(Map<String, Object> source, Class<T> targetType);
}
