JacksonUtil.java

/**
 * Copyright © 2016-2018 The Thingsboard 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
 *
 *     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 org.thingsboard.server.dao.util.mapping;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;

/**
 * Created by Valerii Sosliuk on 5/12/2017.
 */
public class JacksonUtil {

    public static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();

    public static <T> T fromString(String string, Class<T> clazz) {
        try {
            return OBJECT_MAPPER.readValue(string, clazz);
        } catch (IOException e) {
            throw new IllegalArgumentException("The given string value: "
                    + string + " cannot be transformed to Json object");
        }
    }

    public static String toString(Object value) {
        try {
            return OBJECT_MAPPER.writeValueAsString(value);
        } catch (JsonProcessingException e) {
            throw new IllegalArgumentException("The given Json object value: "
                    + value + " cannot be transformed to a String");
        }
    }

    public static JsonNode toJsonNode(String value) {
        if (value == null || value.isEmpty()) {
            return null;
        }
        try {
            return OBJECT_MAPPER.readTree(value);
        } catch (IOException e) {
            throw new IllegalArgumentException(e);
        }
    }

    public static <T> T clone(T value) {
        return fromString(toString(value), (Class<T>) value.getClass());
    }
}