CpsPath Query Optimization

- Optimized CpsPathqueries with descendants that only care about the xpath (no attribuets checks)
- Use native query with regular expression for target xpath and descendants
- Refactored so existing sql-geneartion code can be re-used in different repository implementations
- Adjusted related performance test expectations

Issue-ID: CPS-1421
Signed-off-by: ToineSiebelink <toine.siebelink@est.tech>
Change-Id: I3a807a14478c4b3272a5335d31c9aa3615eb2bee

5 files changed, 231 insertions, 112 deletions

diff --git a/cps-ri/src/main/java/org/onap/cps/spi/entities/FragmentEntityArranger.java b/cps-ri/src/main/java/org/onap/cps/spi/entities/FragmentEntityArranger.java
index 27891c525e..6b1162d11b 100644
--- a/cps-ri/src/main/java/org/onap/cps/spi/entities/FragmentEntityArranger.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/entities/FragmentEntityArranger.java
@@ -31,14 +31,13 @@ import lombok.NoArgsConstructor;
 public class FragmentEntityArranger {
 
     /**
-     * Convert a collection of (related) FragmentExtracts into a FragmentEntity (tree) with descendants.
-     * Multiple top level nodes not yet support. If found only the first top level element is returned
+     * Convert a collection of (related) FragmentExtracts into  FragmentEntities (trees) with descendants.
      *
      * @param anchorEntity the anchor(entity) all the fragments belong to
      * @param fragmentExtracts FragmentExtracts to convert
-     * @return a FragmentEntity (tree) with descendants, null if none found.
+     * @return a collection of FragmentEntities (trees) with descendants.
      */
-    public static FragmentEntity toFragmentEntityTree(final AnchorEntity anchorEntity,
+    public static Collection<FragmentEntity> toFragmentEntityTrees(final AnchorEntity anchorEntity,
                                                       final Collection<FragmentExtract> fragmentExtracts) {
         final Map<Long, FragmentEntity> fragmentEntityPerId = new HashMap<>();
         for (final FragmentExtract fragmentExtract : fragmentExtracts) {
@@ -61,7 +60,8 @@ public class FragmentEntityArranger {
         return fragmentEntity;
     }
 
-    private static FragmentEntity reuniteChildrenWithTheirParents(final Map<Long, FragmentEntity> fragmentEntityPerId) {
+    private static Collection<FragmentEntity> reuniteChildrenWithTheirParents(
+        final Map<Long, FragmentEntity> fragmentEntityPerId) {
         final Collection<FragmentEntity> fragmentEntitiesWithoutParentInResultSet = new HashSet<>();
         for (final FragmentEntity fragmentEntity : fragmentEntityPerId.values()) {
             final FragmentEntity parentFragmentEntity = fragmentEntityPerId.get(fragmentEntity.getParentId());
@@ -71,7 +71,7 @@ public class FragmentEntityArranger {
                 parentFragmentEntity.getChildFragments().add(fragmentEntity);
             }
         }
-        return fragmentEntitiesWithoutParentInResultSet.stream().findFirst().orElse(null);
+        return fragmentEntitiesWithoutParentInResultSet;
     }
 
 }
diff --git a/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java b/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java
index 82bcea2f1a..3bd2994305 100644
--- a/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java
@@ -61,6 +61,7 @@ import org.onap.cps.spi.model.DataNode;
 import org.onap.cps.spi.model.DataNodeBuilder;
 import org.onap.cps.spi.repository.AnchorRepository;
 import org.onap.cps.spi.repository.DataspaceRepository;
+import org.onap.cps.spi.repository.FragmentQueryBuilder;
 import org.onap.cps.spi.repository.FragmentRepository;
 import org.onap.cps.spi.utils.SessionManager;
 import org.onap.cps.utils.JsonObjectMapper;
@@ -265,36 +266,37 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
                                               final String xpath, final FetchDescendantsOption fetchDescendantsOption) {
         final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
         final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
+        final FragmentEntity fragmentEntity;
         if (isRootXpath(xpath)) {
             final List<FragmentExtract> fragmentExtracts = fragmentRepository.getTopLevelFragments(dataspaceEntity,
                     anchorEntity);
-            return FragmentEntityArranger.toFragmentEntityTree(anchorEntity,
-                    fragmentExtracts);
+            fragmentEntity = FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts)
+                .stream().findFirst().orElse(null);
         } else {
             final String normalizedXpath = getNormalizedXpath(xpath);
-            final FragmentEntity fragmentEntity;
             if (FetchDescendantsOption.OMIT_DESCENDANTS.equals(fetchDescendantsOption)) {
                 fragmentEntity =
                     fragmentRepository.getByDataspaceAndAnchorAndXpath(dataspaceEntity, anchorEntity, normalizedXpath);
             } else {
-                fragmentEntity = buildFragmentEntityFromFragmentExtracts(anchorEntity, normalizedXpath);
-            }
-            if (fragmentEntity == null) {
-                throw new DataNodeNotFoundException(dataspaceEntity.getName(), anchorEntity.getName(), xpath);
+                fragmentEntity = buildFragmentEntitiesFromFragmentExtracts(anchorEntity, normalizedXpath)
+                    .stream().findFirst().orElse(null);
             }
-            return fragmentEntity;
         }
+        if (fragmentEntity == null) {
+            throw new DataNodeNotFoundException(dataspaceEntity.getName(), anchorEntity.getName(), xpath);
+        }
+        return fragmentEntity;
+
     }
 
-    private FragmentEntity buildFragmentEntityFromFragmentExtracts(final AnchorEntity anchorEntity,
-                                                                   final String normalizedXpath) {
-        final FragmentEntity fragmentEntity;
+    private Collection<FragmentEntity> buildFragmentEntitiesFromFragmentExtracts(final AnchorEntity anchorEntity,
+                                                                                 final String normalizedXpath) {
         final List<FragmentExtract> fragmentExtracts =
                 fragmentRepository.findByAnchorIdAndParentXpath(anchorEntity.getId(), normalizedXpath);
         log.debug("Fetched {} fragment entities by anchor {} and cps path {}.",
                 fragmentExtracts.size(), anchorEntity.getName(), normalizedXpath);
-        fragmentEntity = FragmentEntityArranger.toFragmentEntityTree(anchorEntity, fragmentExtracts);
-        return fragmentEntity;
+        return FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts);
+
     }
 
     @Override
@@ -308,32 +310,73 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
         } catch (final PathParsingException e) {
             throw new CpsPathException(e.getMessage());
         }
-        List<FragmentEntity> fragmentEntities =
-                fragmentRepository.findByAnchorAndCpsPath(anchorEntity.getId(), cpsPathQuery);
+
+        Collection<FragmentEntity> fragmentEntities;
+        if (canUseRegexQuickFind(fetchDescendantsOption, cpsPathQuery)) {
+            return getDataNodesUsingRegexQuickFind(fetchDescendantsOption, anchorEntity, cpsPathQuery);
+        }
+        fragmentEntities = fragmentRepository.findByAnchorAndCpsPath(anchorEntity.getId(), cpsPathQuery);
         if (cpsPathQuery.hasAncestorAxis()) {
-            final Set<String> ancestorXpaths = processAncestorXpath(fragmentEntities, cpsPathQuery);
-            fragmentEntities = ancestorXpaths.isEmpty() ? Collections.emptyList()
-                    : fragmentRepository.findAllByAnchorAndXpathIn(anchorEntity, ancestorXpaths);
+            fragmentEntities = getAncestorFragmentEntities(anchorEntity, cpsPathQuery, fragmentEntities);
         }
-        return createDataNodesFromFragmentEntities(fetchDescendantsOption, anchorEntity,
-                fragmentEntities);
+        return createDataNodesFromProxiedFragmentEntities(fetchDescendantsOption, anchorEntity, fragmentEntities);
     }
 
-    private List<DataNode> createDataNodesFromFragmentEntities(final FetchDescendantsOption fetchDescendantsOption,
-                                                               final AnchorEntity anchorEntity,
-                                                               final List<FragmentEntity> fragmentEntities) {
-        final List<DataNode> dataNodes = new ArrayList<>(fragmentEntities.size());
-        for (final FragmentEntity proxiedFragmentEntity : fragmentEntities) {
-            final DataNode dataNode;
+    private static boolean canUseRegexQuickFind(final FetchDescendantsOption fetchDescendantsOption,
+                                                final CpsPathQuery cpsPathQuery) {
+        return fetchDescendantsOption.equals(FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS)
+            && !cpsPathQuery.hasLeafConditions()
+            && !cpsPathQuery.hasTextFunctionCondition();
+    }
+
+    private List<DataNode> getDataNodesUsingRegexQuickFind(final FetchDescendantsOption fetchDescendantsOption,
+                                                           final AnchorEntity anchorEntity,
+                                                           final CpsPathQuery cpsPathQuery) {
+        Collection<FragmentEntity> fragmentEntities;
+        final String xpathRegex = FragmentQueryBuilder.getXpathSqlRegex(cpsPathQuery, true);
+        final List<FragmentExtract> fragmentExtracts =
+            fragmentRepository.quickFindWithDescendants(anchorEntity.getId(), xpathRegex);
+        fragmentEntities = FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts);
+        if (cpsPathQuery.hasAncestorAxis()) {
+            fragmentEntities = getAncestorFragmentEntities(anchorEntity, cpsPathQuery, fragmentEntities);
+        }
+        return createDataNodesFromFragmentEntities(fetchDescendantsOption, fragmentEntities);
+    }
+
+    private Collection<FragmentEntity> getAncestorFragmentEntities(final AnchorEntity anchorEntity,
+                                                                   final CpsPathQuery cpsPathQuery,
+                                                                   Collection<FragmentEntity> fragmentEntities) {
+        final Set<String> ancestorXpaths = processAncestorXpath(fragmentEntities, cpsPathQuery);
+        fragmentEntities = ancestorXpaths.isEmpty() ? Collections.emptyList()
+            : fragmentRepository.findAllByAnchorAndXpathIn(anchorEntity, ancestorXpaths);
+        return fragmentEntities;
+    }
+
+    private List<DataNode> createDataNodesFromProxiedFragmentEntities(
+                                            final FetchDescendantsOption fetchDescendantsOption,
+                                            final AnchorEntity anchorEntity,
+                                            final Collection<FragmentEntity> proxiedFragmentEntities) {
+        final List<DataNode> dataNodes = new ArrayList<>(proxiedFragmentEntities.size());
+        for (final FragmentEntity proxiedFragmentEntity : proxiedFragmentEntities) {
             if (FetchDescendantsOption.OMIT_DESCENDANTS.equals(fetchDescendantsOption)) {
-                dataNode = toDataNode(proxiedFragmentEntity, fetchDescendantsOption);
+                dataNodes.add(toDataNode(proxiedFragmentEntity, fetchDescendantsOption));
             } else {
                 final String normalizedXpath = getNormalizedXpath(proxiedFragmentEntity.getXpath());
-                final FragmentEntity unproxiedFragmentEntity = buildFragmentEntityFromFragmentExtracts(anchorEntity,
-                        normalizedXpath);
-                dataNode = toDataNode(unproxiedFragmentEntity, fetchDescendantsOption);
+                final Collection<FragmentEntity> unproxiedFragmentEntities =
+                    buildFragmentEntitiesFromFragmentExtracts(anchorEntity, normalizedXpath);
+                for (final FragmentEntity unproxiedFragmentEntity : unproxiedFragmentEntities) {
+                    dataNodes.add(toDataNode(unproxiedFragmentEntity, fetchDescendantsOption));
+                }
             }
-            dataNodes.add(dataNode);
+        }
+        return Collections.unmodifiableList(dataNodes);
+    }
+
+    private List<DataNode> createDataNodesFromFragmentEntities(final FetchDescendantsOption fetchDescendantsOption,
+                                                               final Collection<FragmentEntity> fragmentEntities) {
+        final List<DataNode> dataNodes = new ArrayList<>(fragmentEntities.size());
+        for (final FragmentEntity fragmentEntity : fragmentEntities) {
+            dataNodes.add(toDataNode(fragmentEntity, fetchDescendantsOption));
         }
         return Collections.unmodifiableList(dataNodes);
     }
@@ -364,7 +407,7 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
         sessionManager.lockAnchor(sessionId, dataspaceName, anchorName, timeoutInMilliseconds);
     }
 
-    private static Set<String> processAncestorXpath(final List<FragmentEntity> fragmentEntities,
+    private static Set<String> processAncestorXpath(final Collection<FragmentEntity> fragmentEntities,
                                                     final CpsPathQuery cpsPathQuery) {
         final Set<String> ancestorXpath = new HashSet<>();
         final Pattern pattern =
diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentQueryBuilder.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentQueryBuilder.java
new file mode 100644
index 0000000000..f107928ca7
--- /dev/null
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentQueryBuilder.java
@@ -0,0 +1,139 @@
+/*
+ *  ============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());
+        }
+    }
+
+}
diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepository.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepository.java
index 2c25a61a7e..c9461bf062 100755
--- a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepository.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepository.java
@@ -94,4 +94,12 @@ public interface FragmentRepository extends JpaRepository<FragmentEntity, Long>,
            nativeQuery = true)

     List<FragmentExtract> findByAnchorIdAndParentXpath(@Param("anchorId") int anchorId,

                                                        @Param("parentXpath") String parentXpath);

+

+    @Query(value = "SELECT id, anchor_id AS anchorId, xpath, parent_id AS parentId,"

+        + " CAST(attributes AS TEXT) AS attributes"

+        + " FROM FRAGMENT WHERE anchor_id = :anchorId"

+        + " AND xpath ~ :xpathRegex",

+        nativeQuery = true)

+    List<FragmentExtract> quickFindWithDescendants(@Param("anchorId") int anchorId,

+                                                   @Param("xpathRegex") String xpathRegex);

 }

diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryCpsPathQueryImpl.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryCpsPathQueryImpl.java
index 1d61416cfd..6e8f05f017 100644
--- a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryCpsPathQueryImpl.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryCpsPathQueryImpl.java
@@ -20,103 +20,32 @@
 
 package org.onap.cps.spi.repository;
 
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 import javax.persistence.EntityManager;
 import javax.persistence.PersistenceContext;
 import javax.persistence.Query;
 import javax.transaction.Transactional;
 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;
 
 @RequiredArgsConstructor
 @Slf4j
 public class FragmentRepositoryCpsPathQueryImpl implements FragmentRepositoryCpsPathQuery {
 
-    public static final String REGEX_ABSOLUTE_PATH_PREFIX = ".*\\/";
-    public static final String REGEX_OPTIONAL_LIST_INDEX_POSTFIX = "(\\[@(?!.*\\[).*?])?$";
-
     @PersistenceContext
     private EntityManager entityManager;
-    private final JsonObjectMapper jsonObjectMapper;
+
+    private final FragmentQueryBuilder fragmentQueryBuilder;
 
     @Override
     @Transactional
     public List<FragmentEntity> findByAnchorAndCpsPath(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);
-        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);
+        final Query query = fragmentQueryBuilder.getQueryForAnchorAndCpsPath(anchorId, cpsPathQuery);
         final List<FragmentEntity> fragmentEntities = query.getResultList();
         log.debug("Fetched {} fragment entities by anchor and cps path.", fragmentEntities.size());
         return fragmentEntities;
     }
 
-    private static String getXpathSqlRegex(final CpsPathQuery cpsPathQuery) {
-        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);
-        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());
-        }
-    }
-
 }