Persisting data nodes (fragments tree structure)

Issue-ID: CPS-136

Signed-off-by: niamhcore <niamh.core@est.tech>
Change-Id: I559afad41bf0eab1cc98c777a418b348c9c1b81c

2 files changed, 97 insertions, 2 deletions

diff --git a/cps-ri/src/main/java/org/onap/cps/spi/entities/FragmentEntity.java b/cps-ri/src/main/java/org/onap/cps/spi/entities/FragmentEntity.java
index d1557489c3..677652899d 100755
--- a/cps-ri/src/main/java/org/onap/cps/spi/entities/FragmentEntity.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/entities/FragmentEntity.java
@@ -22,6 +22,8 @@ package org.onap.cps.spi.entities;
 
 import com.vladmihalcea.hibernate.type.json.JsonBinaryType;
 import java.io.Serializable;
+import java.util.Set;
+import javax.persistence.CascadeType;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.FetchType;
@@ -30,10 +32,13 @@ import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.JoinColumn;
 import javax.persistence.ManyToOne;
+import javax.persistence.OneToMany;
 import javax.persistence.OneToOne;
+import javax.persistence.Table;
 import javax.validation.constraints.NotNull;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
+import lombok.Data;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
@@ -44,12 +49,14 @@ import org.hibernate.annotations.TypeDefs;
 /**
  * Entity to store a fragment.
  */
+@Data
 @Getter
 @Setter
 @AllArgsConstructor
 @NoArgsConstructor
 @Builder
 @Entity
+@Table(name = "fragment")
 @TypeDefs({@TypeDef(name = "jsonb", typeClass = JsonBinaryType.class)})
 public class FragmentEntity implements Serializable {
 
@@ -76,7 +83,7 @@ public class FragmentEntity implements Serializable {
     @JoinColumn(name = "anchor_id")
     private AnchorEntity anchor;
 
-    @OneToOne(fetch = FetchType.LAZY)
+    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
     @JoinColumn(name = "parent_id")
-    private FragmentEntity parentFragment;
+    private Set<FragmentEntity> childFragments;
 }
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
new file mode 100644
index 0000000000..283d646825
--- /dev/null
+++ b/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java
@@ -0,0 +1,88 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 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.impl;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.ImmutableSet.Builder;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import org.onap.cps.spi.CpsDataPersistenceService;
+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.spi.model.DataNode;
+import org.onap.cps.spi.repository.AnchorRepository;
+import org.onap.cps.spi.repository.DataspaceRepository;
+import org.onap.cps.spi.repository.FragmentRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService {
+
+    @Autowired
+    private DataspaceRepository dataspaceRepository;
+
+    @Autowired
+    private AnchorRepository anchorRepository;
+
+    @Autowired
+    private FragmentRepository fragmentRepository;
+
+    private static Gson GSON = new GsonBuilder().create();
+
+    @Override
+    public void storeDataNode(final String dataspaceName, final String anchorName, final DataNode dataNode) {
+        final DataspaceEntity dataspaceEntity = dataspaceRepository.getByName(dataspaceName);
+        final AnchorEntity anchorEntity = anchorRepository.getByDataspaceAndName(dataspaceEntity, anchorName);
+        final FragmentEntity fragmentEntity = convertToFragmentWithAllDescendants(dataspaceEntity, anchorEntity,
+            dataNode);
+        fragmentRepository.save(fragmentEntity);
+    }
+
+    /**
+     * Convert DataNode object into Fragment and places the result in the fragments placeholder. Performs same action
+     * for all DataNode children recursively.
+     *
+     * @param dataspaceEntity       dataspace
+     * @param anchorEntity          anchorEntity
+     * @param dataNodeToBeConverted dataNode
+     * @return a Fragment built from current DataNode
+     */
+    private static FragmentEntity convertToFragmentWithAllDescendants(final DataspaceEntity dataspaceEntity,
+        final AnchorEntity anchorEntity, final DataNode dataNodeToBeConverted) {
+        final FragmentEntity parentFragment = FragmentEntity.builder()
+            .dataspace(dataspaceEntity)
+            .anchor(anchorEntity)
+            .xpath(dataNodeToBeConverted.getXpath())
+            .attributes(GSON.toJson(dataNodeToBeConverted.getLeaves()))
+            .build();
+
+        final Builder<FragmentEntity> fragmentEntityBuilder = ImmutableSet.builder();
+        for (final DataNode childDataNode : dataNodeToBeConverted.getChildDataNodes()) {
+            final FragmentEntity childFragment =
+                convertToFragmentWithAllDescendants(parentFragment.getDataspace(), parentFragment.getAnchor(),
+                    childDataNode);
+            fragmentEntityBuilder.add(childFragment);
+        }
+        parentFragment.setChildFragments(fragmentEntityBuilder.build());
+        return parentFragment;
+    }
+}