Persistence layer - Query Datanodes using cpsPath that contains contains a leaf name and a leaf value

Issue-ID: CPS-231
Signed-off-by: niamhcore <niamh.core@est.tech>
Change-Id: I9bd483a4b76e233ab6c64b3ef8aacb593e4e9da0

3 files changed, 100 insertions, 0 deletions

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 fd4e768ca..2d9588e8f 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
@@ -21,6 +21,7 @@
 package org.onap.cps.spi.impl;
 
 import static org.onap.cps.spi.FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS;
+import static org.onap.cps.spi.FetchDescendantsOption.OMIT_DESCENDANTS;
 
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.ImmutableSet.Builder;
@@ -38,6 +39,7 @@ import org.onap.cps.spi.entities.DataspaceEntity;
 import org.onap.cps.spi.entities.FragmentEntity;
 import org.onap.cps.spi.model.DataNode;
 import org.onap.cps.spi.model.DataNodeBuilder;
+import org.onap.cps.spi.query.CpsPathQuery;
 import org.onap.cps.spi.repository.AnchorRepository;
 import org.onap.cps.spi.repository.DataspaceRepository;
 import org.onap.cps.spi.repository.FragmentRepository;
@@ -124,6 +126,19 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
         return fragmentRepository.getByDataspaceAndAnchorAndXpath(dataspaceEntity, anchorEntity, xpath);
     }
 
+    @Override
+    public List<DataNode> queryDataNodes(final String dataspaceName, final String anchorName, final String cpsPath) {
+        final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
+        final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
+        final CpsPathQuery cpsPathQuery = CpsPathQuery.createFrom(cpsPath);
+        final List<FragmentEntity> fragmentEntities = fragmentRepository
+            .getByAnchorAndXpathAndLeafAttributes(anchorEntity.getId(), cpsPathQuery
+                .getXpathPrefix(), cpsPathQuery.getLeafName(), cpsPathQuery.getLeafValue());
+        return fragmentEntities.stream()
+            .map(fragmentEntity -> toDataNode(fragmentEntity, OMIT_DESCENDANTS))
+            .collect(Collectors.toUnmodifiableList());
+    }
+
     private static DataNode toDataNode(final FragmentEntity fragmentEntity,
         final FetchDescendantsOption fetchDescendantsOption) {
         final Map<String, Object> leaves = GSON.fromJson(fragmentEntity.getAttributes(), Map.class);
diff --git a/cps-ri/src/main/java/org/onap/cps/spi/query/CpsPathQuery.java b/cps-ri/src/main/java/org/onap/cps/spi/query/CpsPathQuery.java
new file mode 100644
index 000000000..4fcf6e444
--- /dev/null
+++ b/cps-ri/src/main/java/org/onap/cps/spi/query/CpsPathQuery.java
@@ -0,0 +1,76 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Nordix Foundation
+ *  Modifications Copyright (C) 2021 Bell Canada. 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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.spi.query;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.Setter;
+import org.onap.cps.spi.exceptions.CpsPathException;
+
+@Getter
+@Setter(AccessLevel.PRIVATE)
+public class CpsPathQuery {
+
+    private String xpathPrefix;
+    private String leafName;
+    private Object leafValue;
+
+    public static final Pattern QUERY_CPS_PATH_WITH_SINGLE_LEAF_PATTERN =
+        Pattern.compile("(.*)\\[\\s*@(.*?)\\s*=\\s*(.*?)\\s*]");
+
+    public static final Pattern LEAF_STRING_VALUE_PATTERN = Pattern.compile("['\"](.*)['\"]");
+
+    public static final Pattern LEAF_INTEGER_VALUE_PATTERN = Pattern.compile("[-+]?\\d+");
+
+    /**
+     * Returns a xpath prefix, leaf name and leaf value for the given cps path.
+     *
+     * @param cpsPath cps path
+     * @return a CpsPath object containing the xpath prefix, leaf name and leaf value.
+     */
+    public static CpsPathQuery createFrom(final String cpsPath) {
+        final Matcher matcher = QUERY_CPS_PATH_WITH_SINGLE_LEAF_PATTERN.matcher(cpsPath);
+        if (matcher.matches()) {
+            final CpsPathQuery cpsPathQuery = new CpsPathQuery();
+            cpsPathQuery.setXpathPrefix(matcher.group(1));
+            cpsPathQuery.setLeafName(matcher.group(2));
+            cpsPathQuery.setLeafValue(convertLeafValueToCorrectType(matcher.group(3)));
+            return cpsPathQuery;
+        }
+        throw new CpsPathException("Invalid cps path.",
+            String.format("Cannot interpret or parse cps path %s.", cpsPath));
+    }
+
+    private static Object convertLeafValueToCorrectType(final String leafValueString) {
+        final Matcher stringValueWithQuotesMatcher = LEAF_STRING_VALUE_PATTERN.matcher(leafValueString);
+        if (stringValueWithQuotesMatcher.matches()) {
+            return stringValueWithQuotesMatcher.group(1);
+        }
+        final Matcher integerValueMatcher = LEAF_INTEGER_VALUE_PATTERN.matcher(leafValueString);
+        if (integerValueMatcher.matches()) {
+            return Integer.valueOf(leafValueString);
+        }
+        throw new CpsPathException("Unsupported leaf value.",
+            String.format("Unsupported leaf value %s in cps path.", leafValueString));
+    }
+}
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 bf551723f..a40168a9d 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
@@ -22,6 +22,7 @@
 package org.onap.cps.spi.repository;

 

 import java.util.Collection;

+import java.util.List;

 import java.util.Optional;

 import javax.validation.constraints.NotNull;

 import org.checkerframework.checker.nullness.qual.NonNull;

@@ -51,4 +52,12 @@ public interface FragmentRepository extends JpaRepository<FragmentEntity, Long>
     @Query("DELETE FROM FragmentEntity fe WHERE fe.anchor IN (:anchors)")

     void deleteByAnchorIn(@NotNull @Param("anchors") Collection<AnchorEntity> anchorEntities);

 

+    @Query(value =

+        "SELECT * FROM FRAGMENT WHERE (anchor_id = :anchor) AND (xpath = (:xpath) OR xpath LIKE "

+            + "CONCAT(:xpath,'\\[@%]')) AND attributes @> jsonb_build_object(:leafName , :leafValue)",

+                nativeQuery = true)

+    // Above query will match an xpath with or without the index for a list [@key=value]

+    // and match anchor id, leaf name and leaf value

+    List<FragmentEntity> getByAnchorAndXpathAndLeafAttributes(@Param("anchor") int anchorId, @Param("xpath")

+        String xpathPrefix, @Param("leafName") String leafName, @Param("leafValue") Object leafValue);

 }
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