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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.onap.vfc.nfvo.vnfm.svnfm.vnfmadapter.common;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import net.sf.json.JSONArray;
import net.sf.json.JSONException;
import net.sf.json.JSONObject;
import net.sf.json.util.JSONTokener;
/**
* VNFM JSON utils.</br>
*
* @author
* @version VFC 1.0 Sep 10, 2016
*/
public final class VnfmJsonUtil {
private static final Logger LOGGER = LoggerFactory.getLogger(VnfmJsonUtil.class);
private VnfmJsonUtil(){
//private constructor
}
/**
* Get the JSON string from input http context.
* <br/>
*
* @param vnfReq HttpServletRequest
* @return
* @since VFC 1.0
*/
@SuppressWarnings("unchecked")
public static <T> T getJsonFromContexts(HttpServletRequest vnfReq) {
try {
InputStream vnfInput = vnfReq.getInputStream();
String vnfJsonStr = IOUtils.toString(vnfInput);
JSONTokener vnfJsonTokener = new JSONTokener(vnfJsonStr);
if(vnfJsonTokener.nextClean() == Character.codePointAt("{", 0)) {
return (T)JSONObject.fromObject(vnfJsonStr);
}
vnfJsonTokener.back();
if(vnfJsonTokener.nextClean() == Character.codePointAt("[", 0)) {
return (T)JSONArray.fromObject(vnfJsonStr);
}
} catch(IOException e) {
LOGGER.error("function=getJsonFromContext, msg=IOException occurs, e={}.", e);
} catch(JSONException e) {
LOGGER.error("function=getJsonFromContext, msg=JSONException occurs, e={}.", e);
}
return null;
}
}
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