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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017-2018 AT&T Intellectual Property. 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.
* ============LICENSE_END=========================================================
*/
package org.onap.aai.schemaservice.nodeschema;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.onap.aai.logging.LogFormatTools;
import org.springframework.stereotype.Service;
import javax.annotation.PostConstruct;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.ByteArrayOutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
@Service
public class NodeSchemaService {
private static final Logger LOGGER = LoggerFactory.getLogger(NodeSchemaResource.class);
private SchemaVersions schemaVersions;
private NodeIngestor nodeIngestor;
private Map<String, String> versionMap = new HashMap<>();
public NodeSchemaService(NodeIngestor nodeIngestor, SchemaVersions schemaVersions) {
this.nodeIngestor = nodeIngestor;
this.schemaVersions = schemaVersions;
}
@PostConstruct
public void initialize() {
schemaVersions.getVersions().forEach((schemaVersion -> {
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = null;
try {
transformer = tf.newTransformer();
} catch (TransformerConfigurationException e) {
LOGGER.warn("Encountered an transformer configuration exception" +
"during node schema service startup ", LogFormatTools.getStackTop(e));
}
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
transformer.setOutputProperty(OutputKeys.METHOD, "xml");
transformer.setOutputProperty(OutputKeys.INDENT, "no");
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
try {
DOMSource domSource = new DOMSource(nodeIngestor.getSchema(schemaVersion));
StreamResult streamResult = new StreamResult(new OutputStreamWriter(buffer, "UTF-8"));
transformer.transform(domSource, streamResult);
versionMap.put(schemaVersion.toString(), buffer.toString("UTF-8"));
} catch (TransformerException | UnsupportedEncodingException e) {
LOGGER.warn("Encountered an transformer or unsupported encoding exception " +
"during node schema service startup ", LogFormatTools.getStackTop(e));
}
}));
}
public Optional<String> fetch(String version) {
return Optional.ofNullable(versionMap.get(version));
}
}
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