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/*-
* ============LICENSE_START=======================================================
* Simulator
* ================================================================================
* Copyright (C) 2019 Nokia. 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.pnfsimulator.template.search;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import org.onap.pnfsimulator.template.search.handler.PrimitiveValueCriteriaBuilder;
import org.onap.pnfsimulator.template.search.viewmodel.FlatTemplateContent;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.stereotype.Component;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
@Component
public class TemplateSearchHelper {
private static final String PARENT_TO_CHILD_KEY_SEPARATOR = ":"; //compliant with flat json stored in db
private static final String FLATTENED_JSON_KEY_REGEX = PARENT_TO_CHILD_KEY_SEPARATOR + "%s(?:(\\[[\\d]+\\]))?$";
private static final String FLATTENED_TEMPLATES_VIEW = "flatTemplatesView";
private MongoTemplate mongoTemplate;
private PrimitiveValueCriteriaBuilder criteriaBuilder;
@Autowired
public TemplateSearchHelper(MongoTemplate mongoTemplate) {
this.mongoTemplate = mongoTemplate;
this.criteriaBuilder = new PrimitiveValueCriteriaBuilder();
}
public List<String> getIdsOfDocumentMatchingCriteria(JsonObject jsonCriteria) {
if (isNullValuePresentInCriteria(jsonCriteria)) {
throw new IllegalJsonValueException("Null values in search criteria are not supported.");
}
Criteria mongoDialectCriteria = composeCriteria(jsonCriteria);
Query query = new Query(mongoDialectCriteria);
List<FlatTemplateContent> flatTemplateContents = mongoTemplate.find(query, FlatTemplateContent.class, FLATTENED_TEMPLATES_VIEW);
return flatTemplateContents
.stream()
.map(FlatTemplateContent::getId)
.collect(Collectors.toList());
}
private Criteria composeCriteria(JsonObject criteria) {
Criteria[] criteriaArr = criteria.entrySet()
.stream()
.map(this::mapEntryCriteriaWithRegex)
.toArray(Criteria[]::new);
return criteriaArr.length > 0 ? new Criteria().andOperator(criteriaArr) : new Criteria();
}
private Criteria mapEntryCriteriaWithRegex(Map.Entry<String, JsonElement> entry) {
Pattern primitiveOrArrayElemKeyRegex = getCaseInsensitive(String.format(FLATTENED_JSON_KEY_REGEX, entry.getKey()));
Criteria criteriaForJsonKey = Criteria.where("k").regex(primitiveOrArrayElemKeyRegex);
Criteria criteriaWithValue = criteriaBuilder.applyValueCriteriaBasedOnPrimitiveType(criteriaForJsonKey.and("v"), entry.getValue().getAsJsonPrimitive());
return Criteria.where("keyValues").elemMatch(criteriaWithValue);
}
private boolean isNullValuePresentInCriteria(JsonObject jsonObject) {
return jsonObject.entrySet()
.stream()
.map(Map.Entry::getValue)
.anyMatch(JsonElement::isJsonNull);
}
static Pattern getCaseInsensitive(String base) {
return Pattern.compile(base, Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
}
}
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