1 files changed, 91 insertions, 0 deletions
diff --git a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/operations/YangModelCmHandleRetriever.java b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/operations/YangModelCmHandleRetriever.java
new file mode 100644
index 000000000..6b6bdf5be
--- /dev/null
+++ b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/operations/YangModelCmHandleRetriever.java
@@ -0,0 +1,91 @@
+/*
+ *  ============LICENSE_START=======================================================
+ *  Copyright (C) 2021-2022 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.ncmp.api.impl.operations;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import lombok.AllArgsConstructor;
+import org.onap.cps.api.CpsDataService;
+import org.onap.cps.ncmp.api.impl.yangmodels.YangModelCmHandle;
+import org.onap.cps.ncmp.api.models.NcmpServiceCmHandle;
+import org.onap.cps.spi.FetchDescendantsOption;
+import org.onap.cps.spi.model.DataNode;
+import org.springframework.stereotype.Component;
+
+/**
+ * Retrieves YangModelCmHandles & properties.
+ */
+@Component
+@AllArgsConstructor
+public class YangModelCmHandleRetriever {
+
+    private static final String NCMP_DATASPACE_NAME = "NCMP-Admin";
+    private static final String NCMP_DMI_REGISTRY_ANCHOR = "ncmp-dmi-registry";
+
+    private CpsDataService cpsDataService;
+
+    /**
+     * This method retrieves DMI service name and DMI properties for a given cm handle.
+     * @param cmHandleId the id of the cm handle
+     * @return yang model cm handle
+     */
+    public YangModelCmHandle getDmiServiceNamesAndProperties(final String cmHandleId) {
+        final DataNode cmHandleDataNode = getCmHandleDataNode(cmHandleId);
+        final NcmpServiceCmHandle ncmpServiceCmHandle = new NcmpServiceCmHandle();
+        ncmpServiceCmHandle.setCmHandleID(cmHandleId);
+        populateCmHandleProperties(cmHandleDataNode, ncmpServiceCmHandle);
+        return YangModelCmHandle.toYangModelCmHandle(
+            String.valueOf(cmHandleDataNode.getLeaves().get("dmi-service-name")),
+            String.valueOf(cmHandleDataNode.getLeaves().get("dmi-data-service-name")),
+            String.valueOf(cmHandleDataNode.getLeaves().get("dmi-model-service-name")),
+            ncmpServiceCmHandle
+        );
+    }
+
+    private DataNode getCmHandleDataNode(final String cmHandle) {
+        final String xpathForDmiRegistryToFetchCmHandle = "/dmi-registry/cm-handles[@id='" + cmHandle + "']";
+        return cpsDataService.getDataNode(NCMP_DATASPACE_NAME,
+            NCMP_DMI_REGISTRY_ANCHOR,
+            xpathForDmiRegistryToFetchCmHandle,
+            FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS);
+    }
+
+    private static void populateCmHandleProperties(final DataNode cmHandleDataNode,
+                                                   final NcmpServiceCmHandle ncmpServiceCmHandle) {
+        final Map<String, String> dmiProperties = new LinkedHashMap<>();
+        final Map<String, String> publicProperties = new LinkedHashMap<>();
+        for (final DataNode childDataNode: cmHandleDataNode.getChildDataNodes()) {
+            if (childDataNode.getXpath().contains("/additional-properties[@name=")) {
+                addProperty(childDataNode, dmiProperties);
+            } else if (childDataNode.getXpath().contains("/public-properties[@name=")) {
+                addProperty(childDataNode, publicProperties);
+            }
+        }
+        ncmpServiceCmHandle.setDmiProperties(dmiProperties);
+        ncmpServiceCmHandle.setPublicProperties(publicProperties);
+    }
+
+    private static void addProperty(final DataNode propertyDataNode, final Map<String, String> propertiesAsMap) {
+        propertiesAsMap.put(String.valueOf(propertyDataNode.getLeaves().get("name")),
+            String.valueOf(propertyDataNode.getLeaves().get("value")));
+    }
+
+}