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/*
* Copyright 2016 Huawei Technologies Co., Ltd.
*
* 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.openo.vnfsdk.marketplace.common;
import java.io.File;
import java.io.IOException;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.TypeReference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Json tools class, packaging a number of commonly used Json methods.<br>
*
* @author
* @version GSO 0.5 2016-08-26
*/
public final class JsonUtil {
private static final Logger LOGGER = LoggerFactory.getLogger(JsonUtil.class);
private JsonUtil() {
}
/**
* Convert object to JSON.<br>
*
* @param obj The object to be converted
* @return The JSON string
* @since GSO 0.5
*/
public static String toJson(Object obj) {
try {
return new ObjectMapper().writeValueAsString(obj);
} catch(IOException ex) {
LOGGER.error("Parser to json error.", ex);
throw new IllegalArgumentException("Parser obj to json error, obj = " + obj, ex);
}
}
/**
* Convert JSON to object.<br>
*
* @param jsonStr The JSON to be converted
* @param objClass The object class
* @return The objClass object
* @since GSO 0.5
*/
public static <T> T fromJson(String jsonStr, Class<T> objClass) {
try {
ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
return mapper.readValue(jsonStr, objClass);
} catch(IOException ex) {
LOGGER.error("Parser to object error.", ex);
throw new IllegalArgumentException(
"Parser json to object error, json = " + jsonStr + ", expect class = " + objClass, ex);
}
}
/**
* Convert JSON to object.<br>
*
* @param jsonStr The JSON to be converted
* @param typeRef The object type
* @return The typeRef object
* @since GSO 0.5
*/
public static <T> T fromJson(String jsonStr, TypeReference<T> typeRef) {
try {
ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
return mapper.readValue(jsonStr, typeRef);
} catch(IOException ex) {
LOGGER.error("Parser to object by type reference error.", ex);
throw new IllegalArgumentException(
"Parser json to object error, json = " + jsonStr + ", expect type = " + typeRef.getType(), ex);
}
}
/**
* Turn a json file in to a java object. <br>
*
* @param file the json file need to change.
* @param objClass the java class json string represent.
* @return the java object parsed from json string.
* @since GSO 0.5
*/
public static <T> T fromJson(File file, Class<T> objClass) {
try {
ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
return mapper.readValue(file, objClass);
} catch(IOException ex) {
LOGGER.error("Parser to object error.", ex);
throw new IllegalArgumentException(
"Parser json to object error, file = " + file.getName() + ", expect class = " + objClass, ex);
}
}
}
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