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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2022 Nordix Foundation
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.cps.spi.repository;
import java.util.HashMap;
import java.util.Map;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.onap.cps.cpspath.parser.CpsPathPrefixType;
import org.onap.cps.cpspath.parser.CpsPathQuery;
import org.onap.cps.spi.entities.FragmentEntity;
import org.onap.cps.utils.JsonObjectMapper;
import org.springframework.stereotype.Component;
@RequiredArgsConstructor
@Slf4j
@Component
public class FragmentQueryBuilder {
private static final String REGEX_ABSOLUTE_PATH_PREFIX = ".*\\/";
private static final String REGEX_OPTIONAL_LIST_INDEX_POSTFIX = "(\\[@(?!.*\\[).*?])?";
private static final String REGEX_DESCENDANT_PATH_POSTFIX = "(\\/.*)?";
private static final String REGEX_END_OF_INPUT = "$";
@PersistenceContext
private EntityManager entityManager;
private final JsonObjectMapper jsonObjectMapper;
/**
* Create a sql query to retrieve by anchor(id) and cps path.
*
* @param anchorId the id of the anchor
* @param cpsPathQuery the cps path query to be transformed into a sql query
* @return a executable query object
*/
public Query getQueryForAnchorAndCpsPath(final int anchorId, final CpsPathQuery cpsPathQuery) {
final StringBuilder sqlStringBuilder = new StringBuilder("SELECT * FROM FRAGMENT WHERE anchor_id = :anchorId");
final Map<String, Object> queryParameters = new HashMap<>();
queryParameters.put("anchorId", anchorId);
sqlStringBuilder.append(" AND xpath ~ :xpathRegex");
final String xpathRegex = getXpathSqlRegex(cpsPathQuery, false);
queryParameters.put("xpathRegex", xpathRegex);
if (cpsPathQuery.hasLeafConditions()) {
sqlStringBuilder.append(" AND attributes @> :leafDataAsJson\\:\\:jsonb");
queryParameters.put("leafDataAsJson", jsonObjectMapper.asJsonString(
cpsPathQuery.getLeavesData()));
}
addTextFunctionCondition(cpsPathQuery, sqlStringBuilder, queryParameters);
final Query query = entityManager.createNativeQuery(sqlStringBuilder.toString(), FragmentEntity.class);
setQueryParameters(query, queryParameters);
return query;
}
/**
* Create a regular expression (string) for xpath based on the given cps path query.
*
* @param cpsPathQuery the cps path query to determine the required regular expression
* @param includeDescendants include descendants yes or no
* @return a string representing the required regular expression
*/
public static String getXpathSqlRegex(final CpsPathQuery cpsPathQuery, final boolean includeDescendants) {
final StringBuilder xpathRegexBuilder = new StringBuilder();
if (CpsPathPrefixType.ABSOLUTE.equals(cpsPathQuery.getCpsPathPrefixType())) {
xpathRegexBuilder.append(escapeXpath(cpsPathQuery.getXpathPrefix()));
} else {
xpathRegexBuilder.append(REGEX_ABSOLUTE_PATH_PREFIX);
xpathRegexBuilder.append(escapeXpath(cpsPathQuery.getDescendantName()));
}
xpathRegexBuilder.append(REGEX_OPTIONAL_LIST_INDEX_POSTFIX);
if (includeDescendants) {
xpathRegexBuilder.append(REGEX_DESCENDANT_PATH_POSTFIX);
}
xpathRegexBuilder.append(REGEX_END_OF_INPUT);
return xpathRegexBuilder.toString();
}
private static String escapeXpath(final String xpath) {
// See https://jira.onap.org/browse/CPS-500 for limitations of this basic escape mechanism
return xpath.replace("[@", "\\[@");
}
private static Integer getTextValueAsInt(final CpsPathQuery cpsPathQuery) {
try {
return Integer.parseInt(cpsPathQuery.getTextFunctionConditionValue());
} catch (final NumberFormatException e) {
return null;
}
}
private static void addTextFunctionCondition(final CpsPathQuery cpsPathQuery,
final StringBuilder sqlStringBuilder,
final Map<String, Object> queryParameters) {
if (cpsPathQuery.hasTextFunctionCondition()) {
sqlStringBuilder.append(" AND (");
sqlStringBuilder.append("attributes @> jsonb_build_object(:textLeafName, :textValue)");
sqlStringBuilder
.append(" OR attributes @> jsonb_build_object(:textLeafName, json_build_array(:textValue))");
queryParameters.put("textLeafName", cpsPathQuery.getTextFunctionConditionLeafName());
queryParameters.put("textValue", cpsPathQuery.getTextFunctionConditionValue());
final Integer textValueAsInt = getTextValueAsInt(cpsPathQuery);
if (textValueAsInt != null) {
sqlStringBuilder.append(" OR attributes @> jsonb_build_object(:textLeafName, :textValueAsInt)");
sqlStringBuilder
.append(" OR attributes @> jsonb_build_object(:textLeafName, json_build_array(:textValueAsInt))");
queryParameters.put("textValueAsInt", textValueAsInt);
}
sqlStringBuilder.append(")");
}
}
private static void setQueryParameters(final Query query, final Map<String, Object> queryParameters) {
for (final Map.Entry<String, Object> queryParameter : queryParameters.entrySet()) {
query.setParameter(queryParameter.getKey(), queryParameter.getValue());
}
}
}
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