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package com.allways.utils;

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

public class JacksonUtil {
	private static Logger logger = LoggerFactory.getLogger(JacksonUtil.class);

    private final static ObjectMapper objectMapper = new ObjectMapper();
    public static ObjectMapper getInstance() {
        return objectMapper;
    }

    public static String writeValueAsString(Object obj) {
    	try {
			return getInstance().writeValueAsString(obj);
		} catch (JsonGenerationException e) {
			logger.error(e.getMessage(), e);
		} catch (JsonMappingException e) {
			logger.error(e.getMessage(), e);
		} catch (IOException e) {
			logger.error(e.getMessage(), e);
		}
        return null;
    }

    public static  T readValue(String jsonStr, Class clazz) {
    	try {
			return getInstance().readValue(jsonStr, clazz);
		} catch (JsonParseException e) {
			logger.error(e.getMessage(), e);
		} catch (JsonMappingException e) {
			logger.error(e.getMessage(), e);
		} catch (IOException e) {
			logger.error(e.getMessage(), e);
		}
    	return null;
    }

	public static  T readValue(String jsonStr, Class parametrized, Class... parameterClasses) {
		try {
			JavaType javaType = getInstance().getTypeFactory().constructParametricType(parametrized, parameterClasses);
			return getInstance().readValue(jsonStr, javaType);
		} catch (JsonParseException e) {
			logger.error(e.getMessage(), e);
		} catch (JsonMappingException e) {
			logger.error(e.getMessage(), e);
		} catch (IOException e) {
			logger.error(e.getMessage(), e);
		}
		return null;
	}

    /*public static  T readValueRefer(String jsonStr, Class clazz) {
    	try {
			return getInstance().readValue(jsonStr, new TypeReference() { });
		} catch (JsonParseException e) {
			logger.error(e.getMessage(), e);
		} catch (JsonMappingException e) {
			logger.error(e.getMessage(), e);
		} catch (IOException e) {
			logger.error(e.getMessage(), e);
		}
    	return null;
    }*/

    public static void main(String[] args) {
		try {
			Map map = new HashMap();
			map.put("aaa", "111");
			map.put("bbb", "222");
			String json = writeValueAsString(map);
			System.out.println(json);
			System.out.println(readValue(json, Map.class));
		} catch (Exception e) {
			logger.error(e.getMessage(), e);
		}
	}
}