Implement PNFD Model driven conversion

[sdc.git] / openecomp-be / lib / openecomp-tosca-converter-lib / openecomp-tosca-converter-core / src / main / java / org / openecomp / core / converter / impl / pnfd / PnfdTransformationDescriptorReader.java

diff --git a/openecomp-be/lib/openecomp-tosca-converter-lib/openecomp-tosca-converter-core/src/main/java/org/openecomp/core/converter/impl/pnfd/PnfdTransformationDescriptorReader.java b/openecomp-be/lib/openecomp-tosca-converter-lib/openecomp-tosca-converter-core/src/main/java/org/openecomp/core/converter/impl/pnfd/PnfdTransformationDescriptorReader.java
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+++ b/openecomp-be/lib/openecomp-tosca-converter-lib/openecomp-tosca-converter-core/src/main/java/org/openecomp/core/converter/impl/pnfd/PnfdTransformationDescriptorReader.java
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+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 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.openecomp.core.converter.impl.pnfd;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+import org.apache.commons.collections.CollectionUtils;
+import org.onap.sdc.tosca.services.YamlUtil;
+import org.openecomp.core.converter.impl.pnfd.parser.TransformationYamlParser;
+import org.openecomp.core.converter.pnfd.model.Transformation;
+import org.openecomp.core.converter.pnfd.model.TransformationDescription;
+import org.openecomp.sdc.logging.api.Logger;
+import org.openecomp.sdc.logging.api.LoggerFactory;
+
+/**
+ * Reads the PNF Transformation Description
+ */
+public class PnfdTransformationDescriptorReader {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(PnfdTransformationDescriptorReader.class);
+
+    /**
+     * Parse the transformation description to {@link TransformationDescription} class.
+     * @return
+     *  The {@link TransformationDescription} instance.
+     */
+    public TransformationDescription parse(final InputStream transformationDescriptionInputStream) {
+        final List<Object> transformationList = readDescriptionYaml(transformationDescriptionInputStream);
+        final Set<Transformation> transformationSet = parseTransformationList(transformationList);
+
+        return new TransformationDescription(transformationSet);
+    }
+
+    /**
+     * Reads the description file that has the required YAML format.
+     * @return
+     *  The yaml parsed to Object
+     */
+    private List<Object> readDescriptionYaml(final InputStream transformationDescriptionPath) {
+        try (final InputStream fileInputStream = transformationDescriptionPath) {
+            return YamlUtil.yamlToList(fileInputStream).orElse(Collections.emptyList());
+        } catch (final FileNotFoundException e) {
+            LOGGER.error("Could not find the resource on path.", e);
+        } catch (final IOException e) {
+            LOGGER.error("Could not load resource.", e);
+        }
+        return Collections.emptyList();
+    }
+
+    /**
+     * Parse the transformation list represented in a YAML object to {@link Transformation}.
+     * @param transformationYamlList    the YAML object read from the transformation description file
+     * @return
+     *  The set of transformations represented as {@link Transformation} class
+     */
+    private Set<Transformation> parseTransformationList(final List<Object> transformationYamlList) {
+        if (CollectionUtils.isEmpty(transformationYamlList)) {
+            return Collections.emptySet();
+        }
+
+        return transformationYamlList.stream()
+            .map(conversionMap -> TransformationYamlParser.parse((Map<String, Object>) conversionMap))
+            .collect(Collectors.toSet());
+    }
+
+}