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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.Objects;
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).orElse(null))
.filter(Objects::nonNull).collect(Collectors.toSet());
}
}
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