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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.core.utilities.json;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonIOException;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;
import org.apache.commons.collections.CollectionUtils;
import org.everit.json.schema.EnumSchema;
import org.everit.json.schema.Schema;
import org.everit.json.schema.ValidationException;
import org.everit.json.schema.loader.SchemaLoader;
import org.json.JSONObject;
import org.openecomp.core.utilities.CommonMethods;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringReader;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
/**
* The type Json util.
*/
public class JsonUtil {
/**
* Object 2 json string.
*
* @param obj the obj
* @return the string
*/
//TODO: refactor all other ugly code to use this
public static String object2Json(Object obj) {
return sbObject2Json(obj).toString();
}
/**
* Sb object 2 json string buffer.
*
* @param obj the obj
* @return the string buffer
*/
public static StringBuffer sbObject2Json(Object obj) {
return new StringBuffer((new GsonBuilder()).setPrettyPrinting().create().toJson(obj));
}
/**
* Json 2 object t.
*
* @param <T> the type parameter
* @param json the json
* @param classOfT the class of t
* @return the t
*/
public static <T> T json2Object(String json, Class<T> classOfT) {
T type;
try {
try (Reader br = new StringReader(json)) {
type = new Gson().fromJson(br, classOfT);
} catch (IOException e0) {
throw e0;
}
} catch (JsonIOException | JsonSyntaxException | IOException e0) {
throw new RuntimeException(e0);
}
return type;
}
/**
* Json 2 object t.
*
* @param <T> the type parameter
* @param is the is
* @param classOfT the class of t
* @return the t
*/
public static <T> T json2Object(InputStream is, Class<T> classOfT) {
T type;
try {
try (Reader br = new BufferedReader(new InputStreamReader(is))) {
type = new Gson().fromJson(br, classOfT);
}
} catch (JsonIOException | JsonSyntaxException | IOException e0) {
throw new RuntimeException(e0);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException ignore) {
//do nothing
}
}
}
return type;
}
/**
* Is valid json boolean.
*
* @param json the json
* @return the boolean
*/
//todo check https://github.com/stleary/JSON-java as replacement for this code
public static boolean isValidJson(String json) {
try {
return new JsonParser().parse(json).isJsonObject();
} catch (JsonSyntaxException jse) {
return false;
}
}
/**
* Validate list.
*
* @param json the json
* @param jsonSchema the json schema
* @return the list
*/
public static List<String> validate(String json, String jsonSchema) {
List<ValidationException> validationErrors = validateUsingEverit(json, jsonSchema);
return validationErrors == null ? null
: validationErrors.stream().map(JsonUtil::mapValidationExceptionToMessage)
.collect(Collectors.toList());
}
private static String mapValidationExceptionToMessage(ValidationException e0) {
if (e0.getViolatedSchema() instanceof EnumSchema) {
return mapEnumViolationToMessage(e0);
}
return e0.getMessage();
}
private static String mapEnumViolationToMessage(ValidationException e1) {
Set<Object> possibleValues = ((EnumSchema) e1.getViolatedSchema()).getPossibleValues();
return e1.getMessage().replaceFirst("enum value", possibleValues.size() == 1
? String.format("value. %s is the only possible value for this field",
possibleValues.iterator().next())
: String.format("value. Possible values: %s", CommonMethods
.collectionToCommaSeparatedString(
possibleValues.stream().map(Object::toString).collect(Collectors.toList()))));
}
private static List<ValidationException> validateUsingEverit(String json, String jsonSchema) {
if (json == null || jsonSchema == null) {
throw new IllegalArgumentException("Input strings json and jsonSchema can not be null");
}
Schema schemaObj = SchemaLoader.load(new JSONObject(jsonSchema));
try {
schemaObj.validate(new JSONObject(json));
} catch (ValidationException ve) {
return CollectionUtils.isEmpty(ve.getCausingExceptions()) ? Collections.singletonList(ve)
: ve.getCausingExceptions();
}
return null;
}
}
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