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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2022-2023 Nordix Foundation
* Modifications Copyright (C) 2023 TechMahindra 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.cps.spi.repository;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
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.AnchorEntity;
import org.onap.cps.spi.entities.DataspaceEntity;
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_DESCENDANT_PATH_PREFIX = "^.*\\/";
private static final String REGEX_OPTIONAL_LIST_INDEX_POSTFIX = "(\\[@(?!.*\\[).*?])?$";
private static final String REGEX_FOR_QUICK_FIND_WITH_DESCENDANTS = "(\\[@.*?])?(\\/.*)?$";
private static final AnchorEntity ACROSS_ALL_ANCHORS = null;
@PersistenceContext
private EntityManager entityManager;
private final JsonObjectMapper jsonObjectMapper;
/**
* Create a sql query to retrieve by anchor(id) and cps path.
*
* @param anchorEntity the anchor
* @param cpsPathQuery the cps path query to be transformed into a sql query
* @return a executable query object
*/
public Query getQueryForAnchorAndCpsPath(final AnchorEntity anchorEntity, final CpsPathQuery cpsPathQuery) {
return getQueryForDataspaceOrAnchorAndCpsPath(anchorEntity.getDataspace(), anchorEntity, cpsPathQuery);
}
/**
* Create a sql query to retrieve by cps path.
*
* @param dataspaceEntity the dataspace
* @param cpsPathQuery the cps path query to be transformed into a sql query
* @return a executable query object
*/
public Query getQueryForDataspaceAndCpsPath(final DataspaceEntity dataspaceEntity,
final CpsPathQuery cpsPathQuery) {
return getQueryForDataspaceOrAnchorAndCpsPath(dataspaceEntity, ACROSS_ALL_ANCHORS, cpsPathQuery);
}
/**
* Create a regular expression (string) for matching xpaths based on the given cps path query.
*
* @param cpsPathQuery the cps path query to determine the required regular expression
* @return a string representing the required regular expression
*/
public static String getXpathSqlRegex(final CpsPathQuery cpsPathQuery) {
final StringBuilder xpathRegexBuilder = getRegexStringBuilderWithPrefix(cpsPathQuery);
xpathRegexBuilder.append(REGEX_OPTIONAL_LIST_INDEX_POSTFIX);
return xpathRegexBuilder.toString();
}
/**
* Create a regular expression (string) for matching xpaths with (all) descendants
* based on the given cps path query.
*
* @param cpsPathQuery the cps path query to determine the required regular expression
* @return a string representing the required regular expression
*/
public static String getXpathSqlRegexForQuickFindWithDescendants(final CpsPathQuery cpsPathQuery) {
final StringBuilder xpathRegexBuilder = getRegexStringBuilderWithPrefix(cpsPathQuery);
xpathRegexBuilder.append(REGEX_FOR_QUICK_FIND_WITH_DESCENDANTS);
return xpathRegexBuilder.toString();
}
private Query getQueryForDataspaceOrAnchorAndCpsPath(final DataspaceEntity dataspaceEntity,
final AnchorEntity anchorEntity,
final CpsPathQuery cpsPathQuery) {
final StringBuilder sqlStringBuilder = new StringBuilder();
final Map<String, Object> queryParameters = new HashMap<>();
sqlStringBuilder.append("SELECT * FROM fragment WHERE ");
addDataspaceOrAnchor(sqlStringBuilder, queryParameters, dataspaceEntity, anchorEntity);
addXpathSearch(cpsPathQuery, sqlStringBuilder, queryParameters);
addLeafConditions(cpsPathQuery, sqlStringBuilder);
addTextFunctionCondition(cpsPathQuery, sqlStringBuilder, queryParameters);
addContainsFunctionCondition(cpsPathQuery, sqlStringBuilder, queryParameters);
final Query query = entityManager.createNativeQuery(sqlStringBuilder.toString(), FragmentEntity.class);
setQueryParameters(query, queryParameters);
return query;
}
private static void addDataspaceOrAnchor(final StringBuilder sqlStringBuilder,
final Map<String, Object> queryParameters,
final DataspaceEntity dataspaceEntity,
final AnchorEntity anchorEntity) {
if (anchorEntity == ACROSS_ALL_ANCHORS) {
sqlStringBuilder.append("dataspace_id = :dataspaceId");
queryParameters.put("dataspaceId", dataspaceEntity.getId());
} else {
sqlStringBuilder.append("anchor_id = :anchorId");
queryParameters.put("anchorId", anchorEntity.getId());
}
}
private static void addXpathSearch(final CpsPathQuery cpsPathQuery,
final StringBuilder sqlStringBuilder,
final Map<String, Object> queryParameters) {
sqlStringBuilder.append(" AND xpath ~ :xpathRegex");
final String xpathRegex = getXpathSqlRegex(cpsPathQuery);
queryParameters.put("xpathRegex", xpathRegex);
}
private static StringBuilder getRegexStringBuilderWithPrefix(final CpsPathQuery cpsPathQuery) {
final StringBuilder xpathRegexBuilder = new StringBuilder();
if (CpsPathPrefixType.ABSOLUTE.equals(cpsPathQuery.getCpsPathPrefixType())) {
xpathRegexBuilder.append(REGEX_ABSOLUTE_PATH_PREFIX);
xpathRegexBuilder.append(escapeXpath(cpsPathQuery.getXpathPrefix()));
return xpathRegexBuilder;
}
xpathRegexBuilder.append(REGEX_DESCENDANT_PATH_PREFIX);
xpathRegexBuilder.append(escapeXpath(cpsPathQuery.getDescendantName()));
return xpathRegexBuilder;
}
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 void addLeafConditions(final CpsPathQuery cpsPathQuery, final StringBuilder sqlStringBuilder) {
if (cpsPathQuery.hasLeafConditions()) {
sqlStringBuilder.append(" AND (");
final List<String> queryBooleanOperatorsType = cpsPathQuery.getBooleanOperatorsType();
final Queue<String> booleanOperatorsQueue = (queryBooleanOperatorsType == null) ? null : new LinkedList<>(
queryBooleanOperatorsType);
cpsPathQuery.getLeavesData().entrySet().forEach(entry -> {
sqlStringBuilder.append(" attributes @> ");
sqlStringBuilder.append("'");
sqlStringBuilder.append(jsonObjectMapper.asJsonString(entry));
sqlStringBuilder.append("'");
if (!(booleanOperatorsQueue == null || booleanOperatorsQueue.isEmpty())) {
sqlStringBuilder.append(" ");
sqlStringBuilder.append(booleanOperatorsQueue.poll());
sqlStringBuilder.append(" ");
}
});
sqlStringBuilder.append(")");
}
}
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 addContainsFunctionCondition(final CpsPathQuery cpsPathQuery,
final StringBuilder sqlStringBuilder,
final Map<String, Object> queryParameters) {
if (cpsPathQuery.hasContainsFunctionCondition()) {
sqlStringBuilder.append(" AND attributes ->> :containsLeafName LIKE CONCAT('%',:containsValue,'%') ");
queryParameters.put("containsLeafName", cpsPathQuery.getContainsFunctionConditionLeafName());
queryParameters.put("containsValue", cpsPathQuery.getContainsFunctionConditionValue());
}
}
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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