BLE_WIFI_Scale_Server_Api/utils/JsonMapper.java

package com.inet.ailink.receiver.common.utils;

import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.util.JSONPObject;

import java.io.IOException;


public class JsonMapper {

	private ObjectMapper mapper;

	public JsonMapper() {
		this(null);
	}

	public JsonMapper(Include include) {
		mapper = new ObjectMapper();
		if (include != null) {
			mapper.setSerializationInclusion(include);
		}
		mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
		mapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
	}

	
	public static JsonMapper nonEmptyMapper() {
		return new JsonMapper(Include.NON_EMPTY);
	}

	
	public static JsonMapper nonDefaultMapper() {
		return new JsonMapper(Include.NON_DEFAULT);
	}

	
	public static JsonMapper nonAlwaysMapper() {
		return new JsonMapper(Include.ALWAYS);
	}

	
	public String toJson(Object object) {

		try {
			return mapper.writeValueAsString(object);
		} catch (IOException e) {
			return null;
		}
	}

	public <T> T fromMapToObject(Object map, Class<T> cls) {		
		return this.fromJson(this.toJson(map), cls);
	}
	public <T> T fromMapToObject(Object map, JavaType cls) {
		return this.fromJson(this.toJson(map), cls);
	}

	
	public <T> T fromJson(String jsonString, Class<T> clazz) {
		if (isEmpty(jsonString)) {
			return null;
		}

		try {
			return mapper.readValue(jsonString, clazz);
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	
	public <T> T fromJson(String jsonString, JavaType javaType) {
		if (isEmpty(jsonString)) {
			return null;
		}

		try {
			return (T) mapper.readValue(jsonString, javaType);
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	
	public JavaType createCollectionType(Class<?> collectionClass, Class<?>... elementClasses) {
		return mapper.getTypeFactory().constructParametricType(collectionClass, elementClasses);
	}

	
	public <T> T update(String jsonString, T object) {
		try {
			return (T) mapper.readerForUpdating(object).readValue(jsonString);
		} catch (JsonProcessingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

	
	public String toJsonP(String functionName, Object object) {
		return toJson(new JSONPObject(functionName, object));
	}

	
	public void enableEnumUseToString() {
		mapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
		mapper.enable(DeserializationFeature.READ_ENUMS_USING_TO_STRING);
	}

	
	public ObjectMapper getMapper() {
		return mapper;
	}

	public static boolean isEmpty(String str) {
		return str == null || str.length() == 0;
	}
}