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/*-
* ============LICENSE_START=======================================================
* ONAP POLICY-CLAMP
* ================================================================================
* Copyright (C) 2021 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.onap.policy.clamp.policy.pdpgroup;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import java.util.stream.StreamSupport;
import org.onap.policy.clamp.clds.util.JsonUtils;
import org.onap.policy.models.pdp.concepts.PdpGroups;
/**
* This is an utility class that contains methods to work on the different results provided by the PEF.
* Mainly used to aggregate the results.
*/
public class PoliciesPdpMerger {
private PoliciesPdpMerger() {}
/**
* This method extract the content of a policy without knowing the key (policy Id).
* This JsonElement normally contains only the policy ID then the content,
* there is only one member in the Json element.
* As this is not really practical to use this method remove that
* nested Json.
*
* @param policyJsonElement The policy as JsonElement
* @return It return the content as JsonObject
*/
public static JsonObject getPolicyContentOutOfJsonElement(JsonElement policyJsonElement) {
mergeJsonElement(policyJsonElement.getAsJsonObject(), policyJsonElement.getAsJsonObject()
.remove(((String) policyJsonElement.getAsJsonObject().keySet().toArray()[0])).getAsJsonObject());
return policyJsonElement.getAsJsonObject();
}
/**
* This method merges 2 JsonElement together. If the jsonToMerge is null nothing is changed.
*
* @param json The initial json that will received the data
* @param jsonToMerge The json that will be added to the first json object
*/
public static void mergeJsonElement(JsonObject json, JsonObject jsonToMerge) {
if (jsonToMerge != null) {
jsonToMerge.entrySet().stream().forEach(entry -> json.add(entry.getKey(), entry.getValue()));
}
}
/**
* This method merges the result of the policy listing and the associated Pdp Group info.
* It can be seen as an enrichment of the policy listing.
*
* @param jsonPoliciesList The Json containing the policies from the PEF
* @param pdpGroupsJson The json containing the PDP groups info from the PEF
* @return It returns a JsonObject containing the policies list enriched with PdpGroup info
*/
public static JsonObject mergePoliciesAndPdpGroupStates(String jsonPoliciesList, String pdpGroupsJson) {
PdpGroups pdpGroups = JsonUtils.GSON.fromJson(pdpGroupsJson, PdpGroups.class);
JsonObject policiesListJson =
JsonUtils.GSON.fromJson(jsonPoliciesList, JsonObject.class).get("topology_template")
.getAsJsonObject();
StreamSupport.stream(policiesListJson.get("policies").getAsJsonArray().spliterator(), true)
.forEach(policyJson -> enrichOnePolicy(pdpGroups, getPolicyContentOutOfJsonElement(policyJson)));
return policiesListJson;
}
/**
* Enrich one policy json node object with pdpGroup info.
*
* @param pdpGroups The pdpGroups from PEF to search the policy
* @param policyJsonNode The policy json node that must be enriched
*/
private static void enrichOnePolicy(PdpGroups pdpGroups, JsonObject policyJsonNode) {
PdpGroupsAnalyzer pdpGroupAnalyzer = new PdpGroupsAnalyzer(pdpGroups);
JsonObject deploymentPdpJson = pdpGroupAnalyzer
.getPdpGroupsForPolicy(policyJsonNode.get("name").getAsString(),
policyJsonNode.get("version").getAsString());
mergeJsonElement(policyJsonNode, deploymentPdpJson);
JsonObject supportedPdpGroupsJson = PdpGroupsAnalyzer
.getSupportedPdpGroupsForModelType(pdpGroups, policyJsonNode.get("type").getAsString(),
policyJsonNode.get("type_version").getAsString());
mergeJsonElement(policyJsonNode, supportedPdpGroupsJson);
}
}
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