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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.sdc.be.dao.utils;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
/**
* Simple utility for JSon processing.
*/
public final class JsonUtil {
private static ObjectMapper getOneObjectMapper() {
ObjectMapper mapper = new ObjectMapper();
mapper.enable(SerializationFeature.INDENT_OUTPUT);
mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
mapper.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);
return mapper;
}
private JsonUtil() {
}
// /**
// * Parse a {@link RestResponse} by using the specified dataType as the
// expected data object's class.
// *
// * @param responseAsString
// * The {@link RestResponse} as a JSon String
// * @param dataType
// * The type of the data object.
// * @return The parsed {@link RestResponse} object matching the given JSon.
// * @throws JsonParseException
// * In case of a JSon parsing issue.
// * @throws JsonMappingException
// * In case of a JSon parsing issue.
// * @throws IOException
// * In case of an IO error.
// */
// public static <T> RestResponse<T> read(String responseAsString, Class<T>
// dataType) throws IOException {
// ObjectMapper mapper = getOneObjectMapper();
// JavaType restResponseType =
// mapper.getTypeFactory().constructParametricType(RestResponse.class,
// dataType);
// return mapper.readValue(responseAsString, restResponseType);
// }
/**
* Deserialize json text to object
*
* @param objectText
* @param objectClass
* @return
* @throws JsonParseException
* @throws JsonMappingException
* @throws IOException
*/
public static <T> T readObject(String objectText, Class<T> objectClass) throws IOException {
return getOneObjectMapper().readValue(objectText, objectClass);
}
/**
* Deserialize json stream to object
*
* @param jsonStream
* @param objectClass
* @return
* @throws JsonParseException
* @throws JsonMappingException
* @throws IOException
*/
public static <T> T readObject(InputStream jsonStream, Class<T> objectClass) throws IOException {
return getOneObjectMapper().readValue(jsonStream, objectClass);
}
/**
* Deserialize json text to object
*
* @param objectText
* @return
* @throws JsonParseException
* @throws JsonMappingException
* @throws IOException
*/
public static <T> T readObject(String objectText) throws IOException {
TypeReference<T> typeRef = new TypeReference<T>() {
};
return getOneObjectMapper().readValue(objectText, typeRef);
}
// /**
// * Parse a {@link RestResponse} without being interested in parameterized
// type
// *
// * @param responseAsString
// * @return
// * @throws JsonParseException
// * @throws JsonMappingException
// * @throws IOException
// */
// public static RestResponse<?> read(String responseAsString) throws
// IOException {
// return getOneObjectMapper().readValue(responseAsString,
// RestResponse.class);
// }
// /**
// * Serialize the given object in a JSon String.
// *
// * @param obj
// * The object to serialize.
// * @return The JSon serialization of the given object.
// * @throws JsonProcessingException
// * In case of a failure in serialization.
// */
// public static String toString(Object obj) throws JsonProcessingException
// {
// return getOneObjectMapper().writeValueAsString(obj);
// }
/**
* Deserialize the given json string to a map
*
* @param json
* json text
* @return map object
* @throws IOException
*/
public static Map<String, Object> toMap(String json) throws IOException {
ObjectMapper mapper = getOneObjectMapper();
JavaType mapStringObjectType = mapper.getTypeFactory().constructParametricType(HashMap.class, String.class,
Object.class);
return mapper.readValue(json, mapStringObjectType);
}
/**
* Deserialize the given json string to a map
*
* @param json
* @param keyTypeClass
* @param valueTypeClass
* @return
* @throws IOException
*/
public static <K, V> Map<K, V> toMap(String json, Class<K> keyTypeClass, Class<V> valueTypeClass)
throws IOException {
ObjectMapper mapper = getOneObjectMapper();
JavaType mapStringObjectType = mapper.getTypeFactory().constructParametricType(HashMap.class, keyTypeClass,
valueTypeClass);
return mapper.readValue(json, mapStringObjectType);
}
public static <V> V[] toArray(String json, Class<V> valueTypeClass) throws IOException {
ObjectMapper mapper = getOneObjectMapper();
JavaType arrayStringObjectType = mapper.getTypeFactory().constructArrayType(valueTypeClass);
return mapper.readValue(json, arrayStringObjectType);
}
/**
* Deserialize the given json string to a list
*
* @param json
* json text
* @return list object
* @throws IOException
*/
public static <T> List<T> toList(String json, Class<T> clazz) throws IOException {
ObjectMapper mapper = getOneObjectMapper();
JavaType type = mapper.getTypeFactory().constructCollectionType(List.class, clazz);
return mapper.readValue(json, type);
}
public static <T> List<T> toList(String json, Class<T> elementClass, Class<?> elementGenericClass)
throws IOException {
ObjectMapper mapper = getOneObjectMapper();
JavaType elementType = mapper.getTypeFactory().constructParametricType(elementClass, elementGenericClass);
JavaType listType = mapper.getTypeFactory().constructCollectionType(List.class, elementType);
return mapper.readValue(json, listType);
}
}
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