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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.onap.dcaegen2.services.pmmapper.mapping;
import freemarker.ext.dom.NodeModel;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import lombok.NonNull;
import org.onap.dcaegen2.services.pmmapper.exceptions.MappingException;
import org.onap.dcaegen2.services.pmmapper.exceptions.XMLParseException;
import org.onap.dcaegen2.services.pmmapper.model.Event;
import org.onap.dcaegen2.services.pmmapper.utils.MeasConverter;
import org.onap.logging.ref.slf4j.ONAPLogAdapter;
import org.slf4j.LoggerFactory;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.io.StringWriter;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
public class Mapper {
private static final ONAPLogAdapter logger = new ONAPLogAdapter(LoggerFactory.getLogger(Mapper.class));
private Template mappingTemplate;
private MeasConverter converter;
public Mapper(@NonNull Path pathToTemplate, MeasConverter converter) {
logger.unwrap().trace("Constructing Mapper from {}", pathToTemplate);
this.converter = converter;
Configuration configuration = new Configuration(Configuration.VERSION_2_3_28);
configuration.setTagSyntax(Configuration.ANGLE_BRACKET_TAG_SYNTAX);
try {
InputStreamReader templateInputStreamReader = new InputStreamReader(Files.newInputStream(pathToTemplate));
mappingTemplate = new Template("pm", templateInputStreamReader, configuration, StandardCharsets.UTF_8.name());
} catch (IOException exception) {
logger.unwrap().error("Failed to read template from location {}", pathToTemplate, exception);
throw new IllegalArgumentException("Failed to read template from path", exception);
}
}
public List<Event> mapEvents(List<Event> events) {
events.forEach(event -> event.setVes(this.map(event)));
return events;
}
public String map(@NonNull Event event) {
logger.unwrap().info("Mapping event");
NodeModel pmNodeModel;
try {
String measCollecFile = converter.convert(event.getMeasCollecFile());
pmNodeModel = NodeModel.parse(new InputSource(new StringReader(measCollecFile)));
} catch (IOException | SAXException | ParserConfigurationException exception) {
logger.unwrap().error("Failed to parse input as XML", exception);
throw new XMLParseException("Failed to parse input as XML", exception);
}
Map<String, Object> mappingData = new HashMap<>();
mappingData.put("xml", pmNodeModel);
mappingData.put("metadata", event.getMetadata());
mappingData.put("eventId", makeEventId());
StringWriter mappedOutputWriter = new StringWriter();
try {
mappingTemplate.process(mappingData, mappedOutputWriter);
} catch (IOException | TemplateException exception) {
logger.unwrap().error("Failed to map XML", exception);
throw new MappingException("Mapping failure", exception);
}
logger.unwrap().info("Data mapped successfully");
return mappedOutputWriter.toString();
}
private String makeEventId(){
return UUID.randomUUID().toString();
}
}
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