com.hurence.logisland.util.string.JsonUtil Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of logisland-utils Show documentation
There is a newer version: 1.4.1
/**
 * Copyright (C) 2016 Hurence ([email protected])
 *
 * 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 com.hurence.logisland.util.string;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.hurence.logisland.util.time.DateUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Some JSON helper utilities.
 *
 * @author Thomas Risberg
 *
 */
public class JsonUtil {

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

	private final static ObjectMapper mapper = new ObjectMapper();

	public static Map convertJsonToMap(String json) {
		Map retMap = new HashMap<>();
		if (json != null) {
			try {
				retMap = mapper.readValue(json, new TypeReference> () {
				});
			} catch (IOException e) {
				logger.warn("Error while reading Java Map from JSON response: " + json, e);
			}
		}
		return retMap;
	}

	public static List convertJsonToList(String json) {
		List retList = new ArrayList<>();
		if (json != null) {
			try {
				retList = mapper.readValue(json, new TypeReference>() {
				});
			} catch (IOException e) {
				logger.warn("Error while reading Java List from JSON response: " + json, e);
			}
		}
		return retList;
	}

	public static String convertToJson(Object value) {
		if (mapper.canSerialize(value.getClass())) {
			try {
				return mapper.writeValueAsString(value);
			} catch (IOException e) {
				logger.warn("Error while serializing " + value + " to JSON", e);
				return null;
			}
		} else {
			throw new IllegalArgumentException("Value of type " + value.getClass().getName()
				+ " can not be serialized to JSON.");
		}
	}

}